Documentary Filmmaker Completes Northwest Passage Trip
Filmmaker Sprague Theobald completed a trip through the Northwest Passage, arriving in Ketchikan, AK, Oct. 27 on a 57-foot Nordhavn power boat, reports the Fairbanks Daily News Miner. Theobald and his crew, which included was his son, Sefton Theobald; master diver Greg Deascentis; and cameraman Ulli Bonnekamp, among others, departed Newport, R. I., on June 16. During the journey, the team was hit by an ice floe that trapped their boat in the ice for days. "It was worth the risk, but I would not do it again," Theobold told Yachting Magazine. "We have yet to talk publicly about the more terrifying moments of the trip." During the voyage, he interviewed Inuit elders, other sailors attempting the passage, politicians, and conservationists as he collected material for a full-length documentary, Braving the Northwest Passage, forthcoming. Learn more about the adventure at his blog.
Arctic Commercial Fishing Limits To Go Into Effect Dec. 3
The Associated Press reports that strict commercial fishing limits in the Arctic will go into effect Dec. 3, following a push from the National Oceanic and Atmospheric Administration to develop a plan to regulate commercial fishing in the Arctic in the wake of melting sea ice. The restrictions prohibit industrial fishing in nearly 200,000 square miles of U.S. waters in the Beaufort and Chukchi seas.
Much Arctic Warming Linked To Sea Ice, Cloud Cover Changes
Icebergs in Columbia Bay, Alaska, are representative of ice bodies impacted by Arctic warming. Photo: University Corporation for Atmospheric Research
A study published in the Nov., 2009, issue of the journal Geophysical Research Letters asserts that much of the dramatic change documented in the Arctic over the past 20 years correlates with changes in sea ice concentration and cloud cover. Lead author Yinghui Liu (Cooperative Institute for Meteorological Satellite Studies, University of Wisconsin-Madison, Madison, Wisconsin) writes that sea ice loss in the Chukchi and Beaufort seas in the fall account for significant surface warming. Specifically, the researchers analyze the influence of trends in sea ice concentration and cloud cover on surface temperature in the Arctic from 1982 to 2004. They find that sea ice concentration and cloud cover play a large role in observed temperature trends. For instance, their analysis shows that surface warming associated with sea ice accounts for more than 0.9 degrees Celsius (1.62 degrees Fahrenheit) per decade of the observed 1.1 degrees Celsius (about 2 degrees Fahrenheit) per decade warming trend in autumn. In addition, in winter, cloud cover changes explain 0.91 degrees Celsius (1.64 degrees Fahrenheit) of the 1.2 degrees Celsius (2.16 degrees Fahrenheit) per decade surface temperature cooling, and in spring, 0.55 degrees Celsius (0.99 degrees Fahrenheit) per decade of the total 1 degree Celsius (1.8 degree Fahrenheit) per decade warming is attributable to cloud cover. The authors note that their model provides insight into the causes of recent temperature trends and could be extended to study the influences of other parameters such as sea ice thickness.
Study Links Climate Change to California Drought
U.S. News & World Report publishes a story that the centuries-long droughts experienced by the state of California over the past 20,000 years coincided with thawing Arctic Ice Caps. The research, published online in the journal Earth and Planetary Science Letters by UC Davis doctoral student Jessica Oster and geology professor Isabel Montanez, present evidence from analysis of stalagmites from Moaning Cavern and Black Chasm in the central Sierra Nevada. The authors compared climate records from Greenland with the climate records from the stalagmites. At the end of the last ice age about 15,000 years ago, California became much drier. When Arctic records indicate a cooling period about 13,000 years ago, the data show California experienced wetter weather. The scientists don't offer an explanation for the relationship between Arctic temperatures and California's precipitation. But the article says that climate models developed by others suggest that "When Arctic sea ice disappears, the jet stream—high-altitude winds with a profound influence on climate—shifts north, moving precipitation away from California."
The Copenhagen Climate Conference is less than a month away (December 6 - 18).