Climate Blog and News Recap: 2010 09 24
GHCNv3 Monthly is in the public eye.
GHCN Version 3! (beta) (Hausfather)
Beta version of GHCN v3 is out. (Stokes)
GHCN-M V3 (D Jones)
GHCN V3 Beta: Part 1 – A First Look at Station Inventory data (V Jones)
Keller’s Ammonium concentration in ice cores: A new proxy for regional temperature reconstruction? got some attention.
A South American hockey stick (Skeptical Science)
Two more independent studies back the Hockey Stick: Recent global warming is unprecedented in magnitude and speed and cause (Romm)
Both WUWT and the Hockey Schtick note the publication of Holocene fluctuations in Arctic sea-ice cover: dinocyst-based reconstructions for the eastern Chukchi Sea” (2010) McKay et al.
Jeff Id and Ryan O have a nice write up on Antarctic temp distributions (be sure to check out the comments) Why the Antarctic Is Not Melting Anytime Soon (tAV)
And a blast from the past …
A detailed look at Hansen’s 1988 projections. (Skeptical Science)
Ocean Cooling Contributed to Mid-20th Century Global Warming Hiatus
The hiatus of global warming in the Northern Hemisphere during the mid-20th century may have been due to an abrupt cooling event centered over the North Atlantic around 1970, rather than the cooling effects of tropospheric pollution, according to a new paper appearing Sept. 22 in Nature. …
…The international team of scientists discovered an unexpectedly abrupt cooling event that occurred between roughly 1968 and 1972 in Northern Hemisphere ocean temperatures. The research indicates that the cooling played a key role in the different rates of warming seen in the Northern and Southern Hemispheres in the middle 20th century. …
… “We don’t know why the Northern Hemisphere ocean areas cooled so rapidly around 1970. But the cooling appears to be largest in a climatically important region of the ocean,” Wallace said.
Coral Bleaching Likely in Caribbean This Year
According to the NOAA Coral Reef Watch monitoring system, coral bleaching is likely in the Caribbean in 2010. With temperatures above-average all year, NOAA’s models show a strong potential for bleaching in the southern and southeastern Caribbean through October that could be as severe as in 2005 when over 80 percent of corals bleached and over 40 percent died at many sites across the Caribbean. Scientists are already reporting coral bleaching at several Caribbean sites and severe bleaching has been reported from other parts of the world
Risk of Beetle Outbreaks Rise, Along With Temperature, in the Warming West
The potential for outbreaks of spruce and mountain pine beetles in western North America’s forests is likely to increase significantly in the coming decades, according to a study conducted by USDA Forest Service researchers and their colleagues. Their findings, published in the September issue of the journal BioScience, represent the first comprehensive synthesis of the effects of climate change on bark beetles. …
…One effect the study detected is the likelihood, in a warming climate, of a substantial increase in areas of spruce forest dominated by spruce beetles that reproduce annually rather than every two years, as is common today. Annual reproduction of the beetle can contribute significantly to population growth and the occurrence of outbreaks.
In addition, the study’s models also helped to address concerns about the potential for mountain pine beetles to expand their range across forests of central Canada into the central and Eastern United States. The researchers found that, without adaptation to warming temperatures, the likelihood of this occurring is low to moderate throughout this century.
Growing La Nina Chills out the Pacific
The tropical Pacific Ocean has transitioned from last winter’s El Niño conditions to a cool La Niña, as shown by new data about sea surface heights, collected by the U.S-French Ocean Surface Topography Mission (OSTM)/Jason-2 oceanography satellite. …
…After more than a decade of mostly dry years on the Colorado River watershed and in the American Southwest, and only one normal rain year in the past five years in Southern California, water supplies are dangerously low,” Patzert added. “This La Niña could deepen the drought in the already parched Southwest and could also worsen conditions that have fueled Southern California’s recent deadly wildfires.” NASA will continue to track this change in Pacific climate.
Frosty Times for Dinosaurs: Major Fall in Temperature 137 Million Years Ago During Cretaceous Greenhouse Period, Evidence Shows
A major drop in temperature 137 million years ago briefly interrupted the warm, equable climate of the Cretaceous Period. The water temperature in the Arctic Ocean fell from around 13°C to between 4 and 7°C, possibly causing the poles to freeze over.
Gregory Price from the University of Plymouth, UK and Elizabeth Nunn from Johannes Gutenberg University Mainz, Germany investigated rock samples with fossil belemnites and glendonites from Svalbard in order to determine the temperature of the Arctic Ocean between 140 and 136 million years ago. Such paleoclimate reconstructions help to improve predictions for future climate and environmental development and to gauge the impact of the human race on climate. The temperature of the oceans plays an important role in the history of the Earth’s climate….