8. März 2012

MCA oder MWP - die Zukunft der Mittelalterlichen Warmperiode im AR 5

Aus vergangenen Zeiten wissen wir, dass die Begrifflichkeit einer MWP post 1990 kontinuierlich aus den nachfolgenden Klimaberichten heraus"relativiert", die Warmperiode in zweifacher Hinsicht kaltgemacht wurde. Die Warmperiode wurde zur Klimaanomalie umdefiniert, freilich nur von einigen wenigen, führenden Klimawissenschaftern.

In diesem Beitrag stelle ich mir die Frage, wie wohl im nächsten Klimabericht, dem AR5 mit der MWP umgegangen wird. Wird die Begrifflichkeit verwendet oder wird nunmehr gänzlich von einer Anomalie gesprochen werden?

Zur Beantwortung dieser Frage habe ich mir die Arbeiten der Autoren der IPCC Working Group I, Contribution to the IPCC Fifth Assessment Report, Climate Change 2013: The Physical Science Basis, Coordinating Lead Authors, Lead Authors and Review Editors, Chapter 5: Information from Paleoclimate Archives, näher angesehen. Die Erörterung meiner Vorgehensweise ist aus dem Anhang zu entnehmen.[1]

Coordinating Lead Authors
Valerie MASSON-DELMOTTE +[2]
!Heinz WANNER -[3,4,8]

Meines Erachtens können wir annehmen, dass der MWP auch im AR5 keine Reconquista gelingt. Zu wenige (keine?), in meinen Augen ausschlaggebende Wissenschafter, die an diesem Terminus festhalten, sind in diesem Gremium versammelt. Wahrscheinlicher scheint es mir zu sein, dass die Begrifflichkeit einer MCA, ungeachtet neuester Klimarekonstruktionen (u.a. Oppo et al. 2009, Ljungqvist 2009, 2010, Frank et al. 2010, Kobashi et al. 2010, Guiot et al. 2010, Quao et al. 2010, Chen et al. 2010, Tz-Shing et al. 2011, Mac Gregor et al. 2011, Wang et al. 2011, Hong-Chun et al. 2011, Günther et al. 2011, Gomez-Navarro et al. 2011, Viau et al. 2011, Polovodova et al. 2011, Toker et al. 2011, Larsen et al. 2011, Liu et al. 2011, Ljungqvist et al. 2012), einen weiteren Siegeszug davontragen wird. Der TT "MWP" wird wohl, wenn überhaupt, nur in lokaler, nordhemisphärischer Referenz Verwendung finden, wobei ich mir auch hier nicht sicher bin.

__________
[1] Vor dem Namen der Autoren befindet sich entweder ein "!" oder kein Zusatz. Sollte ein "!" zu finden sein, bedeutet dies, dass der jeweilige Autor, m.E. über großes wissenschaftliches Prestige in Fragen der Klimarekonstruktion bzw. bezüglich der Einordnung von Phänomenen wie MWP und LIA besitzt, darüber forscht und/oder aufgrund seiner Position innerhalb der Autorengruppe über Autorität verfügt, seine Meinung, sein  Einfluss für andere Autoren hierzu folglich von Gewicht sein wird. Nach den Namen befindet sich entweder ein "+", ein "-" samt Verweis auf Publikationen oder beides "+/-". Dies bedeutet, dass sich der jeweilige Autor meines Erachtens positiv über den Erhalt einer MWP in der Nomenklatur äußern wird, da er dies in vergangenen Publikationen implizit oder explizit getan, diesen Terminus verwendet hat. Bei einem "-" ist Gegenteiliges der Fall, bei "+/-" ist es unbestimmt, wie sich der Autor zum Erhalt einer MWP als Fachterm verhalten wird - dafür könnten Gründe ausschlaggebend sein, wie z.B. dass der Autor sich nicht explizit damit beschäftigt hat oder mir momentan keine Studien seinerseits zum Thema vorliegen, welche eine Zuordnung der Meinung des Autors zuließen.
[2] Hou, S., Chappellaz, J., Jouzel, J., Chu, P.C., Masson-Delmotte, V., Qin, D., Raynaud, D., Mayewski, P.A., Lipenkov, V.Y., and Kang, S.: Summer temperature trend over the past two millennia using air content in Himalayan ice, in: Climate of the Past, 3, 2007, 89-95.
[3] Jones, P.D., Briffa, K. R., Osborn, T. J., Lough, J. M., Ommen, D. v., Vinther, B. M., Luterbacher, J., Wahl, E. R., Zwiers, F. W., Mann, M. E., Schmidt, G. A., Ammann, C. M., Buckley, B. M., Cobb, K. M., Esper, J., Goosse, H., Graham, N., Jansen, E., Kiefer, T., Kull, C., Küttel, M., Mosley-Thompson, E., Overpeck, J. T., Riedwyl, N., Schulz, M., Tudhope, A. W., Villalba, R., Wanner, H., Wolff, E., Xoplaki, E.: High-resolution paleoclimatology of the last millennium: a review of current status and future prospects, in: The Holocene, 19, 2009, 3-49.
[4] Breitenmoser, P., Beer, J., Brönnimann, St., Frank, D., Steinhilber, F., Wanner, H.: Solar and volcanic fingerprints in tree-ring chronologies over the past 2000 years, in: Palaeogeography, Palaeoclimatology, Palaeoecology, 313-314, 2012, 127-139.
[5] Gonzalez-Rouco, J.F., Beltrami, H., Zorita, E., Stevens, M. B.: Borehole climatology: a discussion based on contributions fromclimate modeling, in: Clim. Past, 5, 97–127, 2009 - www.clim-past.net/5/97/2009/
[6]  Neukom, R. et al.: Multiproxy summer and winter surface air temperature field reconstructions for SSA, in: Climate Dynamics DOI 10.1007/s00382-010-0793-3.
[7] Graham N. E. et al.: Support for global climate reorganization during the "Medieval Climate Anomaly", in: Climate Dynamics, 37, 5-6, 2010, 1217-1245, DOI: 10.1007/s00382-010-0914-z
* Falls es sich um denselben Dr. Gupta handelt, wie auf der wb ausgewiesen (Anil Kumar Gupta), erschließt es sich mir nicht, warum Dr. Gupta RE sein sollte, welche Qualifikationen er diesbezüglich aufzuweisen hat.
[8] Menschen im Gespräch: Teil VII

29. Februar 2012

2012 und die MWP

Vor kurzem haben Ljungqvist et al. ihr Paper Northern Hemisphere temperature patterns in the last 12 centuries veröffentlicht.

Aus dem Abstract:
We analyse the spatio-temporal patterns of temperature variability over Northern Hemisphere land areas, on centennial time-scales, for the last 12 centuries using an unprecedentedly large network of temperature-sensitive proxy records

Sie kommen dabei auf Seite 231f zum Schluss:
Temperatures from the 9th to 12th centuries are generally above the long-term mean, gradually cooling to below the mean in teh 16th to 19th centuries and reaching a maximum cooling in the 17th century. ... The dominance of warm anomalies during the MWP and cold anomalies during the LIA is substantiated by results from the sign test (Fig. B1) that shows where and when there is significant aggreemant between the sign, positive or negatvie,o f the proxies within their search radius (for more details see Appendix B).

Wiederum wenig überraschend. Überraschend für mich ist eher die Aussage, dass es keine Proxyabdeckung "non-existent" für den Mittleren Osten gäbe (232). 

Folgende Studien, lokalisiert im Mittleren Osten, sprechen eine andere Sprache:
M. S. Chauhan:  Late Holocene vegetation and climate change in the alpine belt of Himachal Pradesh, in: Current Science, Vol. 91, No. 11, 10. Dezember 2006.

A. Bhattacharyya et al.: Climatic changes during the last 1800 yrs BP from Paradise Lake, Sela Pass, Arunachal Pradesh, Northeast Himalaya, in: Current Science, Vol. 93, No. 7, 10. October 2007.

Es sind mittlerweile weitere Studien zur MWP erschienen:
 
Xuhui Dong, Helen Bennion, Richard W. Battarbee, and Carl D. Sayer: A multiproxy palaeolimnological study of climate and nutrient impacts on Esthwaite Water, England over the past 1200 years, in: The Holocene January 2012 22: 107-118, first published on August 22, 2011 doi:10.1177/0959683611409780

Aus dem Abstract:
Two climatic phases, namely the ‘Medieval Warm Period’ (MWP) and the ‘Little Ice Age’ (LIA), were apparent. According to shifts in the diatom assemblages and other proxies, it was proposed that the MWP was initiated from ~ad 880 and was terminated by the LIA at ~ad 1350.

Longbin Sha, Hui Jiang, and Karen Luise Knudsen: Diatom evidence of climatic change in Holsteinsborg Dyb, west of Greenland, during the last 1200 years, in: The Holocene March 2012 22: 347-358, first published on October 12, 2011 doi:10.1177/0959683611423684

Aus dem Abstract:
A relatively warm period with increased influence of Atlantic water masses of the Irminger Current (IC) is found at ad 750–1330, although with some oceanographic variability after ad 1000. A pronounced oceanographic shift occurred at ad 1330, corresponding in time to the transition from the so-called ‘Medieval Warm Period’ (MWP) to the ‘Little Ice Age’ (LIA).

Sofia Ribeiro, Matthias Moros, Marianne Ellegaard, Antoon Kuijpers: Climate variability in West Greenland during the past 1500 years: evidence from a high-resolution marine palynological record from Disko Bay, in: Boreas, Vol. 41, pp. 68–83. 10.1111/j.1502-3885.2011.00216.x. ISSN 0300-9483.

Aus dem Abstract:
After c. AD 1050, the marine climate in Disko Bay becomes in-phase with trends described for the NE Atlantic, reflected in the warmer interval for the remainder of the MCA (c. AD 1050–1250), followed by cooling towards the onset of the Little Ice Age at c. AD 1400.

Eugene R. Wahl, Henry F. Diaz, Christian Ohlwein: A pollen-based reconstruction of summer temperature in central North America and implications for circulation patterns during medieval times, in: Global and Planetary Change, Volumes 84–85, March 2012, Pages 66-74.

Aus dem Abstract:
The results suggest a relatively warm period during the earlier part of the record (~ 1200–1500 CE) followed by a cooler Little Ice Age (~ 1500–1900) and a subsequent warming to modern conditions.

A.E. Viau, M. Ladd, K. Gajewski: The climate of North America during the past 2000 years reconstructed from pollen data, in: Global and Planetary Change, Volumes 84-85, March 2012, Pages 75-83.

Aus dem Abstract:
The MWP was warmer than the LIA over at least the boreal and eastern portions of the continent and perhaps across the continent.

21. Dezember 2011

MWP in China

Ich habe vor kurzem auf verschiedenen Blogs u.a. Pielke Sr. und dem klimaskeptiker gelesen, dass Liu et. a. (2011) für China, genauer für das "central-eastern Tibetan Plateau" u.a. eine MWP nachgewiesen haben. 

Ich frage mich allerdings, was an dieser Erkenntnis in Bezug auf die MWP so spannend sein soll. Eine MWP ist in fast allen, mir bekannten, langfristigen Klimarekonstruktionen für China mehr oder weniger ersichtlich. 

Sehr deutlich beispielsweise bei Ljungqvist (2009). Die verwendeten Proxies waren damals:
24 E China: 
http://www.ncdc.noaa.gov/paleo/paleo.html
25 Shihua Cave, Beijing, China: 
http://www.ncdc.noaa.gov/paleo/paleo.html
26 Lake Qinghai, Tibetan Plateau: 
Data obtained from the author and archived with permission
28 Northern Okinawa Trough, East China Sea: 
Data obtained from the author and archived with permission
29 Dongge Cave, S China: 
http://www.ncdc.noaa.gov/paleo/paleo.html

Ljungqvist meinte im Interview, für mich nicht überraschend:
Auch ich habe für unterschiedliche Regionen Studien aufgeführt. Über eine Studie, angesiedelt in der Hetao-Region im Norden Chinas, habe ich HIER, über Guizhou im Südwesten Chinas HIER gepostet. Die Stalagmit-Studie aus der Furong-"Cave" in Chongqing, habe ich HIER angeführt. Des Weiteren habe ich mehrere Studien HIER präsentiert:
Climate changes over eastern China during the last millennium in simulations and reconstructions, in: Quaternary International, Volume 208, Issues 1-2, 15 October 2009, Pages 11-18, by Youbing Peng, Ying Xu, Liya Jin.
Dust records from varved lacustrine sediments of two neighboring lakes in northeastern China over the last 1400 years, in: Quaternary International, Volume 194, Issues 1-2, 1 February 2009, Pages 108-118, by Guoqiang Chu, Qing Sun, Gu Zhaoyan, Patrick Rioual, Liu Qiang, Wang Kaijun, Jingtai Han, Jiaqi Liu.
Records of late-Holocene East Asian winter monsoon in the East China Sea: Key grain-size component of quartz versus bulk sediments, in: Quaternary International, In Press, Corrected Proof, Available online 6 February 2010, by Shuqing Qiao, Zuosheng Yang, Jingpu Liu, Xiaoxia Sun, Rong Xiang, Xuefa Shi, Dejiang Fan, Yoshiki Saito. 
Moisture changes over the last millennium in arid central Asia: a review, synthesis and comparison with monsoon region, in: Quaternary Science Reviews, Volume 29, Issues 7-8, April 2010, Pages 1055-1068, by Fa-Hu Chen, Jian-Hui Chen, Jonathan Holmes, Ian Boomer, Patrick Austin, John B. Gates, Ning-Lian Wang, Stephen J. Brooks, Jia-Wu Zhang
So gesehen sind die Aussagen zur MWP in der neuen Studie nicht sehr überraschend für mich.

25. November 2011

Climategate reloaded/MWP

Die neuen Mails enthalten viele Aussagen zur MWP und Wissenschaftern, welche sich positiv zur Begrifflichkeit und/oder deren Ausdehnung äußerten.

Broecker veröffentlichte 2001 in Science einen Artikel, in welchem er die Frage aufwarf, ob die MWP global gewesen ist - Was the Medieval Warm Period Global? Die Reaktionen blieben nicht aus (Hervorhebungen von mir). 

Email Nr. 0983196231


From: "Michael E. Mann" 
To: Phil Jones Subject: Re: Wally
Date: Mon, 26 Feb 2001 09:03:51 -0500
Cc: mhughes@[gel. W.v.B.], tom crowley ,  rbradley@[gel. W.v.B.], 
tom@[gel. W.v.B.], k.briffa@[gel. W.v.B.],  t.osborn@[gel. W.v.B.],
mann@[gel. W.v.B.]

Dear Phil,

Thanks for your response. I agree that I think these folks just don't quite
seem to get it! Anyways, I've pasted in the text of Broecker's piece below
(everything there but the figure. Trust me, the figure isn't worth looking
at anyways). Will be very interested to hear your thoughts after reading
this...

mike

PALEOCLIMATE:
Was the Medieval Warm Period Global?
[Broeckers Arbeit wird vollständig angeführt, gel. von mir]


At 12:04 PM 2/26/01 +0000, Phil Jones wrote: 
Dear All,
I was away over the weekend at Bowdoin College in Maine, giving a talk about the 
last 1000 years. There were three others as well on other paleo aspects, 
Richard Alley, Gary Clow and Wally Broecker !  The latter briefly mentioned to me 
that he had had something in last Friday's Science, which was getting at the Mann 
et al. series. He didn't have a copy so we've not seen it here yet. I tried to get 
a copy tof Science on the bookstand at Logan airport last night - I guess it's not
sold that way ! Wally was going on about this 1500 yr cycle of Bond's, which seemed 
pretty flimsy. I was showing all the various series in a general talk - and I used 
some  of the overheads from the upcoming Science paper. This is due to appear in 
the issue for the last week of April. It is all accepted now. I will forward if 
you'll all abide by the Science rules. Both Wally and Alley seem convinced that 
the climate of Greenland changed by 10 C in the space of 2-3 years at times in the 
past (Y Dryas etc).
 
I had long talks with both and they don't seem to have got their heads around 
spatial scales (local changes and hemispheric). Also they don't seem to realise 
where we are coming from. He has a downer on trees (believes all the multiproxy
series depend exclusively on trees) but he thinks Ed Cook is a great scientist.  
The latter is true, but he might just think that because he's at Lamont. I did 
tell him that Keith's paper on the age banding is out in JGR. I should send him a 
reprint and maybe ask that great scientist to go and explain it to him ! Ed's in 
NZ at the moment. Also Wally believes much more in glacier advances/retreats. 
I'll get Keith to send him Sarah's paper where the long Tornetrask reconstruction 
is shown to agree with Storglaciaren advance/retreat dates from moraine evidence. 
Also Sarah's been working on similar glaciers in the Swiss Alps with long tree-ring 
reconstructions.
 
One interesting thing was he didn't seem to realise that a lot of the tree-ring 
reconstructions use density. Seemed to think they were all ring widths and there 
had to be moisture changes we were not accounting for. It is easy to respond to a 
Perspectives piece. Some of you did it with respect to one of mine. I'm not sure 
it will achieve much - it won't come out before the paper in the last week of April.
I need to wait to se what he says. Our paper (me, Tim and Keith) clearly says that 
the MWP couldn't have been warmer (for the NH average) than the late 20th century. 
Another possible reason for not doing anything is that the IPCC report will be out
soon. The summary is written in pretty clear language. The above is my first 
thoughts, not having read the piece and just got off the flight back.

Best to ignore Woijcek. All he seems to want to do is deflect us into 
responding. 
 
Cheers
Phil



At 11:47 25/02/01 -0700, mhughes@[gel. W.v.B.] wrote:
Dear all,
WHat mechanism does "Science" have for repsonding to Perspective pieces?
Most of the answer to Wally is contained within his own piece - he comments on
the ambiguity of the record, which, in various ways, we have all done. What he
doesn't offer, however, is anything other than an anecdotal alternative. As
always, he seeks to damn ( in this case with faint praise) the records or 
work that don't serve his purpose , and to elevate any scrap of evidence that
does serve it. I think it will be important for us to stick closely to what we 
have written in published papers. CHeers, MAlcolm

Quoting "Michael E. Mann":

Dear Phil, Ray,

What do you guys think. If we're all on board, than an appropriately
toned,"high road" response here might be appropriate. We don't want to engage
Wally in a personal battle, but simply should correct the record where
Wally has muddied it. Again, Phil et al do have a Science article in
press that serves this purpose to some extent, so I'm especially interested in
what Phil thinks (Phil?)...

mike

At 02:52 PM 2/24/01 -0700, mhughes@[W.v.B.] wrote:
Dear Mike et al., I think we should definitely let Wojick stew in his
 own juice - as Mike pointed out to me the other day he, and his like, have
a specific agenda, and anything we write will be pressed into the service
of that agenda. I'm not so sure about Wally. I share Tom's disinclination to
get into a street fight with Wally - generally I take the view that life's too
short and uncertain for such activities. On the other hand, would we let such a
shoddy piece of work(and editing) go by if it were from another author? There
are so many holes in Wally's argument, and such a selective choice of evidence
that it should beggar belief. One of the more obvious holes is that he writes
of the Great Basin droughts of the 10th through 14th centuries as proof of
warmer conditions then, but doesn't explain why we don't have such conditions
now. Interestingly, Larry Benson, Dave Meko and others have good evidence
that these same multidecadal periods were marked by a great excess of precipitation
just a few hundred miles north in northern Nevada and California and southern
Oregon.
 
He just hasn't grasped that the methods that are appropriate for tracking the
consequences of major changes in boundary conditions don't work in the late
Holocene. I've been trying to figure out the issue of "Was there a Medieval
Warm Period, and if so where and when" for a decade or so, and still have the
impression that the records for the 9th through 14th centuries are extremely
mixed. But then, I didn't come to the investigation with a certain knowledge of
the absolute truth, and have had to 'misfortune' to work with people
who let careful analysis get in the way - Henry Diaz, Ray and Mike, and others.

Anyway, the point of this rant is that I think we should give careful
consideration to making a measured response to Wally. Cheers, Malcolm
 
 
Quoting "Michael E. Mann":

Hi Tom,

Thanks for your quick reply. I agree with you entirely. I think its very
unfortunate he's chosen to disinform the community rather than engage in
a constructive dialogue (we tried the latter w/ him in a series of emails
last year, but clearly to no avail).

On the other hand, think that a war of words w/ Broecker would be exploited
by the skeptics, and perhaps we should just try to let this thing die...

I'm not sure. I'd appreciate knowing what others think?

mike 
 
At 10:25 AM 2/24/01 -0600, tom crowley wrote:
Mike,

I was not aware of the Broecker piece - I am dismayed but not surprised. I do not 
know what to do - I personally cannot stand the combative personal approach 
Broecker relishes but it does seem as if some rebuttal is called for. Maybe you 
Ray Phil I and Malcolm could pen a response - we are heading to Germany in a week, 
for a month, so I am not sure how much I can keep  up on this but it seems as if 
some response is called for.

What think ye?

Tom


Dear Mike,

Thanks for passing this along.

Wojick of course completely misrepresents Broecker, and puts his conventional 
intellectually dishonest spin on this. 
That having been said, it is a bit disappointing that Wally continues to cling to 
some of his flawed beliefs which aren't supported from either our best current 
understanding of the observations or of the results of careful modeling experiments. 
My own perception is that the climate community, modelers as well as observationalists, 
simply don't take seriously anymore the idea that the history of climate change 
over the past 1000 years is part of an internal oscillation. The sediment core 
evidence oft cited by Broecker (e.g. Bond et al) for this is tremendously weak, 
and I, as well as the vast majority of my colleagues, simply don't buy it for even 
a second. But people don't like to challenge Broecker publically. He can and will
play hardball.

There is an odd irony. Broecker refused to accept the modeling evidence
that the 100 kyr ice age Pleistocene variations were part of an internal
oscillation paced by insolation variations, favoring instead the discredited 
notion that they were a direct response to (too weak) eccentricity forcing, until 
the evidence became insurmountable (from my adviser, Barry Saltzman, may he rest 
in piece, and people like Dick Peltier). Ironically, Broecker then took credit for 
the very proposition he had fought w/ tooth and nail.

Broecker is even more wrong, and unfortunately equally stubborn, in this case.
And, again, the reason: because his pet theory, that climate variability is
a simple millennial oscillation, is finally being challenged w/hard data
and hard facts.

Broecker misrepresents the nature of that data that we and others have
used, and misunderstands the source of the muted hemispheric trends (there
*is* a hemispheric "medieval warm period" and "little ice age", just not of
the magnitude or the distinctiveness that Broecker imagines). Individual
regions in our reconstructions, and Phils, and others, vary by several
degrees C, ie, the proxies we use have no problem whatsoever in resolving
high-amplitude temperature variations in the past. The problem is that when
we look at  the different regions we find that periods of cold and warm
often occur at very different times in different regions, and so in a
hemispheric or global average, a lot of purely regional variability cancels
out. The resulting trends are somewhat smaller. I remained befuddled as to
why Wally doesn't understand this point. Its been explained to him
time and time again. Maybe he's just not listening, or doesn't want to listen...

In fact, Tom Crowley has clearly shown that the observed millennial temperature 
reconstruction is precisely consistent w/ our understanding of *forced* climate 
change over the past 1000 years (solar changes, volcancic output, and recent 
greenhouse gas concentrations). There is, simply put, no room for a global 
millennial internal oscillation. Regionally, such types of climate phenomena, 
associated for example with changes in the North Atlantic ocean circulation, are 
supported by the observations. This explains why, for example, European temperature 
variations are somewhat larger than those in other regions not effected so strongly 
by such climate processes.

Other recent perspectives, by Ray Bradley and myself provide a far more
balanced and nuanced (and less dogmatic or defensive) viewpoint. I'm not
sure a written response to Broecker is worthwhile (this is, afterall, a
"perspective" and everyone understands that a scientist may have a flawed
perspective). If Wally wants this to be his legacy, so be it...

Phil and others have a review article coming out in the near future which
also provides a much more balanced perspective on the climate changes of
the past millennium, and will set the record straight once again (good
timing Phil!). Science's embargo policy prevents me from saying much more
at this time, but if Phil or anyone else wishes to comment further, I'd encourage 
it. Well, I've still got some snow to shovel here in Charlottesville!
Happy weekend to all,

mike

p.s. For those with electronic subscriptions, Broecker's latest piece can be found 
here:

PALEOCLIMATE:
Was the Medieval Warm Period Global?
Wallace S. Broecker
Science Feb 23 2001: 1497-1499. [Summary] [Full Text]

http://www.sciencemag.org/cgi/content/full/291/5508/1497

While my previous perspective piece is here: CLIMATE CHANGE: Lessons for a New 
Millennium 
 
Michael E. Mann
Science 2000 July 14; 289: 253-254. (in Perspectives) [Summary]
[Full Text]
URL:
http://www.sciencemag.org/cgi/content/full/289/5477/253?maxtoshow=&HIT 
S=10&hits=10&RESULTFORMAT=&author1=Mann&searchid=QID_NOT_SET
&stored_search=&FIRSTINDEX=&fdate=10/1/1995&tdate=2/28/2001

and Bradley's is here:

PALEOCLIMATE: Enhanced: 1000 Years of Climate Change
Ray Bradley Science 2000 May 26; 288: 1353-1355. (in Perspectives) [Summary]
[Full Text]

URL:

http://www.sciencemag.org/cgi/content/full/288/5470/1353?maxtoshow=&HI 
TS=10&hits=10&RESULTFORMAT=&author1=Bradley&searchid=QID_NOT_SET
&stored_search=&FIRSTINDEX=&fdate=10/1/1995&tdate=2/28/2001

Dear Michael--The third point below has comments on the controversy
between you and Broecker--I'd be interested in your response (did Wally not
just understand what your data show?). Mike Mike

Three Wojick Pieces on Climate Change. I've been busy busy.

David

FIRST, the latest issue of Insight Magazine includes a point-counterpoint
between measly old me and the great Robert Watson. Boy has he got credentials! Too 
bad he's wrong. Symposium: Do scientists have compelling evidence of global warming?

Yes: Rising sea levels worldwide and retreating Arctic glaciers ominous signs.

By Robert T. Watson -- chairman of the UN Intergovernmental Panel on
Climate Change, chief scientist at the World Bank and former chief science advisor 
to the Clinton White House. No: Despite the overheated rhetoric, there is no new 
evidence of warming

By David E. Wojick -- covers climate policy for Electricity Daily and
is a science adviser to the Greening Earth Society as well as Undereditor of
the Washington Pest 

SECOND, the February 15 Eco-logic on-line has published "The Black Hole of
Global Climate Government" by David Wojick, my detailed attack on the
Framework Convention on Climate Change. It includes a lot of the actual treaty 
language.


THIRD, here is a draft Electricity Daily article of mine. Seems I'm not the only 
one who thinks the IPCC is nuts.

Climate Guru Kicks The Hockey Stick
David Wojick (dwojick@[gel. W.v.B.)

Ich bin beruhigt, dass M. Mann der Meinung ist: there *is* a hemispheric "medieval warm period" and "little ice age", frage mich dann aber schon, warum er in seinen Publikationen immer von einer MCA spricht. Fraglich erscheint mir, dass eine wissenschaftliche Entgegnung im Kreis einer Gruppe, einer "Gang" angestrebt wird. Broecker hat eine andere wissenschaftliche Meinung, diese wird diskreditiert und versucht, gemeinsam

If we're all on board, than an appropriately toned, "high road" response here might be appropriate.

über die Autorität, dieser Meinung zu begegnen.


Email Nr. 0983286849


From: Phil Jones [gel. W.v.B.]
To: mann[gel. W.v.B.]
Subject: Fwd: RE: Science issue Feb 22/23
Date: Tue, 27 Feb 2001 10:14:09 +0000
Cc: mhughes@[gel. W.v.B.],rbradley@[gel. W.v.B.],tom@[gel. W.v.B.], 
k.briffa@[gel.W.v.B.].osborn@[gel. W.v.B.]

Mike et al,
Sorry about the multiple sendings. I've forgotten my glasses and 
couldn't see I'd missed a comma. Another thing to point to is the special issue of 
Climatic Change by Astrid Ogilbie and Trausti Jonsson.  They point to the LIA not 
being very appropriate in Iceland.

  Cheers
  Phil


  Mike,
       So Julia handled it. Even she thought it was handwaving, but it passed the 
usual Science review process.  Obviously this isn't great as none of us got to 
review it. Odd that she didn't send it to one of us here as she knew we were 
writing the article she asked us to !  Anyway that is water under the bridge.
 
As for authorship we have this article coming out so this rules us 
out. Tom isn't keen and he's away.  Wally told me he didn't reckon Tom, so Tom has 
got the right vibes. Julia is asking us to go ahead and hinting at a joint response . 
One possibility is either you or Macolm taking the lead. Malcom and Henry wrote 
the MWP piece in Climate Change in 94. Keith and I think something pointed about 
the MWP is the way to go. Could add in that even the two warming periods in the 
20th century don't show warming everywhere - especially the early 20th century.
Remember that we are all basically averaging long series together and 
if one site shows a big warming/cooling then the average will to a lesser extent.  
 
Also bring in a few of the papers where people have compared tree based reconstructions 
with glacial advances/retreats (eg Raper et al in J. Glaciology and Luckman et 
al in the Holocene. Also there are more in that Interhemispheric Linkages Book of 
Vera amd work by Ricardo Villalba and others).
 
Basically need to point to a load of literature that we would expect 
someone writing an article of this type to be aware of. Also the North Atlantic 
isn't the last word in NH and global averages. Clearly said in Hughes and Diaz and 
papers therein. 
 
Also the latest IPCC report will use and reference the latest curves, 
but from 1400 they are not that different from Bradley and Jones (1993), so why 
the fuss now.
 
Clearly the MWP is the issue that has got a few worked up, but we have 
concluded nothing that couldn't have been gleaned in 1994. Maybe we're stating it 
more clearly now, but the recent warmth of the 1990s is a factor as well.

  Cheers
  Phil

From: "Julia Uppenbrink" To: "Phil Jones" Subject: RE: Science issue Feb 22/23
Date: Mon, 26 Feb 2001 17:05:45 -0000
X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0)
Importance: Normal

Dear Phil

Thanks for your message regarding Wally Broecker's Perspective. I am of
course aware of this Perspective coming out - I did handle it - I realized
that it was perhaps a bit handwaving in parts but I thought the message was
interesting and the article passed the usual screening. But we are always
open to criticism! So please do send a letter to us; you can send it directly 
to me, and you may cowrite it with Tom Crowley and Mike Mann or you can send 
separate letters (if the concerns overlap a lot then one letter is perhaps 
better than several). The letter will be handled through our lettersdepartment,
and we will get a response from Wally plus possibly outside review before 
we make a decision to publish.

I look forward to receiving your letter.

Best wishes

Julia

-----Original Message-----
From: Phil Jones [mailto:p.jones@[gel. W.v.B.]
Sent: 26 February 2001 14:40
To: Julia Uppenbrink
Subject: Science issue Feb 22/23

Dear Julia,
I don't know if you have seen the Perspectives piece in last week's issue of
Science by Wally Broecker.  I guess it was nothing to do with you and it
contains several inaccuracies and sweeping statements. I accept it is a personal
view and I've not seen the issue yet , only a copy that I was ironically given
by Wally Broecker as we were both guest speakers at a meeting at Bowdoin College,
ME on Saturday. I got back this morning to Norwich.
I talked to Wally about it over the weekend and will send him a few reprints
pointing out a few of the things he should have read. Some things he states are 
just wrong.
 
I don't want to change the article already accepted, but what are the 
possibilities of writing a response to Wally's piece in a later issue. 
I've  been contacted by a couple of people in the US about Broecker's piece 
(Mike Mann and Tom Crowley), who are quite unhappy about it and would like to 
respond. They  both know about the invited piece and wanted me to comment, 
hence my email to you. The invited piece does address some of the issues, but 
not the link between high  and low frequency proxy series.

Best Regards
Phil 
 
Schön, dass Phil Jones dasselbe Argument gebraucht, welches ich im Artikel  
Icing the Current Warm Period gebraucht habe: even the two warming periods in 
the 20th century don't show  warming everywhere - 
especially the early 20th century. Remember that we are all basically averaging 
long series together and if one site shows a big warming/cooling then the average 
will to a lesser extent.