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sydneyst
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Posted: Mon Jul 20th, 2009 08:56 pm |
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Greenpeace Challenges Obama with Rushmore Banner
On July 8, Greenpeace rock-climbers scaled Mr. Rushmore, affixing a large banner next to Abraham Lincoln, challenging Pres. Obama to live up to his promises to aggressively reduce greenhouse-gas emissions.
see photos of the banner on Mt. Rushmore and the video recording the event:
http://www.greenpeace.org/usa/news/america-honors-leaders-07-08-09
Last edited on Mon Aug 3rd, 2009 04:50 pm by sydneyst
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sydneyst
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Posted: Wed Jul 8th, 2009 08:46 pm |
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"Real Climate" Reports on Copenhagen Conference
21 Jun 2009—stefan @ 10:03 am with editing by Sydney's Thumb
In March the biggest climate conference of the year took place in Copenhagen, attended by 2500 participants from 80 countries. Over 1400 scientific presentations were made. At end, a Synthesis Report was issued which will provide input to the much anticipated climate protection meeting December, also in Copenhagen.
The climate congress was organised by a “star alliance” of research universities: Copenhagen, Yale, Berkeley, Oxford, Cambridge, Tokyo, Beijing – to name a few. The Synthesis Report is the most important update of climate science since the 2007 IPCC report.
Several key findings emerged from the conference: some aspects of climate change are progressing faster than was expected a few years ago – such as rising sea levels, the increase of heat stored in the ocean and the shrinking Arctic sea ice. “The updated estimates of the future global mean sea level rise are about double the IPCC projections from 2007″, says the new report. And it points out that any warming caused will be virtually irreversible for at least a thousand years – because of the long residence time of CO2 in the atmosphere.
see http://www.realclimate.org
Last edited on Mon Aug 3rd, 2009 04:51 pm by sydneyst
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sydneyst
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Posted: Sat Jul 4th, 2009 08:59 pm |
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Reconstructed World Temperature for 1000 years
http://en.wikipedia.org/wiki/File:2000_Year_Temperature_Comparison.png
No higher resolution available.
The reconstructions used, in order from oldest to most recent publication are:
- (dark blue 1000-1991): P.D. Jones, K.R. Briffa, T.P. Barnett, and S.F.B. Tett (1998). , The Holocene, 8: 455-471. doi:10.1191/095968398667194956
- (blue 1000-1980): M.E. Mann, R.S. Bradley, and M.K. Hughes (1999). , Geophysical Research Letters, 26(6): 759-762.
- (light blue 1000-1965): Crowley and Lowery (2000). , Ambio, 29: 51-54. Modified as published in Crowley (2000). , Science, 289: 270-277. doi:10.1126/science.289.5477.270
- (lightest blue 1402-1960): K.R. Briffa, T.J. Osborn, F.H. Schweingruber, I.C. Harris, P.D. Jones, S.G. Shiyatov, S.G. and E.A. Vaganov (2001). , J. Geophys. Res., 106: 2929-2941.
- (light green 831-1992): J. Esper, E.R. Cook, and F.H. Schweingruber (2002). , Science, 295(5563): 2250-2253. doi:10.1126/science.1066208.
- (yellow 200-1980): M.E. Mann and P.D. Jones (2003). , Geophysical Research Letters, 30(15): 1820. doi:10.1029/2003GL017814.
- (orange 200-1995): P.D. Jones and M.E. Mann (2004). , Reviews of Geophysics, 42: RG2002. doi:10.1029/2003RG000143
- (red-orange 1500-1980): S. Huang (2004). , Geophys. Res Lett., 31: L13205. doi:10.1029/2004GL019781
- (red 1-1979): A. Moberg, D.M. Sonechkin, K. Holmgren, N.M. Datsenko and W. Karlén (2005). , Nature, 443: 613-617. doi:10.1038/nature03265
- (dark red 1600-1990): J.H. Oerlemans (2005). , Science, 308: 675-677. doi:10.1126/science.1107046
(black 1856-2004): Instrumental data was jointly compiled by the w:Climatic Research Unit and the UK Meteorological Office Hadley Centre. Global Annual Average data set TaveGL2v [2] was used.
Documentation for the most recent update of the CRU/Hadley instrumental data set appears in: P.D. Jones and A. Moberg (2003). , Journal of Climate, 16: 206-223.t
Last edited on Sat Jul 4th, 2009 09:02 pm by sydneyst
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sydneyst
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Posted: Wed Mar 4th, 2009 07:48 pm |
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Maps of Areas Inundated by Sea Level Rise
Cresis: Center for Remote Sensing for Ice Sheets provides maps that indicate areas that will be inundated by Sea Level Rise under different projection estimates.
https://www.cresis.ku.edu/research/data/sea_level_rise/jpeg/southeastern_us/Southeastern_US_1to6.jpg
Last edited on Wed Mar 4th, 2009 08:01 pm by sydneyst
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sydneyst
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Posted: Wed Mar 4th, 2009 07:29 pm |
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Dire Finding on Sea-Level Rise and Ice-Pack Melt:
Gravitational Effects Would Increase Levels by 25%
In a February issue of Science magazine, geophysicist at Peter Clark, states that his team has re-estimated the effects of Antarctic ice-pack melt on sea level rise. The new data, takes into account gravitational effects of ice pack melt and suggests that if the pack melts as has been predicted, rising sea level would endanger many coastal areas previously thought to be above the water line.
"The catastrophic increase in sea level, already projected to average between 16 and 17 feet around the world, would be almost 21 feet in such places as Washington, D.C., scientists say, putting it largely underwater. Many coastal areas would be devastated. Much of southern Florida would disappear."
The Intergovernmental Panel on Climate Change had estimated that a collapse of this ice sheet would raise sea levels around the world by about 16.5 feet, on average. However, that theoretical average did not consider several key forces, such as gravity, changes in the Earth’s rotation or a rebound of the land on which the massive glacier now rests, scientists say in the new study.
for more see http://oregonstate.edu/dept/ncs/newsarch/2009/Feb09/icesheet.html
Last edited on Wed Mar 4th, 2009 08:04 pm by sydneyst
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sydneyst
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Posted: Sat Feb 21st, 2009 05:35 am |
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The Other Impact of Thawing Permafrost: Methane Release
Margot Roosevelt, environmental correspondent for the LA Times, recently authored a provocative and alarming story on this issue.
http://www.latimes.com/news/science/environment/la-na-global-warming22-2009feb22,0,646220.story
Excerpt:
International experts are alarmed. "Methane release due to thawing permafrost in the Arctic is a global warming wild card," warned a report by the United Nations Environment Programme last year. Large amounts entering the atmosphere, it concluded, could lead to "abrupt changes in the climate that would likely be irreversible."
Methane (CH4) has at least 20 times the heat-trapping effect of an equivalent amount of carbon dioxide (CO2). As warmer air thaws Arctic soils, as much as 50 billion metric tons of methane could be released from beneath Siberian lakes alone, according to Walter’s research. That would amount to 10 times the amount currently in the atmosphere.
Last edited on Sun Aug 2nd, 2009 12:42 pm by sydneyst
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sydneyst
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Posted: Tue Sep 16th, 2008 06:12 pm |
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Website By Scientists Demystifies Climate Science: Skewers Crichton
A website formed and run by climate scientists addresses points in the debate on global climate change, offering scientific perspective on important contentions, assumptions and criticisms. See: http://www.realclimate.org/index.php/archives/2008/09/simple-question-simple-answer-no/
One page breaks down the arguments of Michael Crichton and shows how they distort and misrepresent IPCC findings and other scientific data.
Sample:
At the end of the book, Crichton gives us an author's message. In it, he re-iterates the main points of his thesis, that there are some who go too far to drum up support (and I have some sympathy with this), and that because we don't know everything, we actually know nothing (here, I beg to differ). He also gives us his estimate, ~0.8 C for the global warming that will occur over the next century and claims that, since models differ by 400% in their estimates, his guess is as good as theirs. This is not true. The current batch of models have a mean climate sensitivity of about 3 C to doubled CO2 (and range between 2.5 and 4.0 degrees) (Paris meeting of IPCC, July 2004) , i.e an uncertainty of about 30%. As discussed above, the biggest uncertainties about the future are the economics, technology and rate of development going forward. The main cause of the spread in the widely quoted 1.5 to 5.8 C range of temperature projections for 2100 in IPCC is actually the different scenarios used. For lack of better information, if we (incorrectly) assume all the scenarios are equally probable, the error around the mean of 3.6 degrees is about 60%, not 400%. Crichton also suggests that most of his 0.8 C warming will be due to land use changes. That is actually extremely unlikely since land use change globally is a cooling effect (as discussed above). Physically-based simulations are actually better than just guessing.
Last edited on Tue Sep 16th, 2008 06:51 pm by sydneyst
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sydneyst
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Posted: Mon Sep 15th, 2008 06:57 am |
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Latest Updates on Arctic Ice Pack
For timely updates and maps on changes in the arctic sea ice, visit the website of the National Snow and Ice Data website:
http://nsidc.org/arcticseaicenews/
Latest data documents a record rate of ice loss through the month of August, further reinforcing conclusions that the Arctic sea ice cover is in a long-term state of decline.
States the site, "With approximately two weeks left in the melt season, the possibility of setting a new record annual minimum in September remains open."
Last edited on Mon Sep 15th, 2008 08:06 pm by sydneyst
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