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    Descripcion:
    These maps show the differences in snow cover relative to the long-term average for the winters of (left) 2009-2010 and (right) 2010-2011. During these two winters, the Northern Hemisphere measured its second and third largest snow cover levels on record. Credit: Georgia Tech/Jiping Liu

    A new study led by the Georgia Institute of Technology provides further evidence of a relationship between melting ice in the Arctic regions and widespread cold outbreaks in the Northern Hemisphere. The study's findings could be used to improve seasonal forecasting of snow and temperature anomalies across northern continents.

    set a new record low in 2007, significantly above-normal winter snow cover has been seen in large parts of the northern United States, northwestern and central Europe, and northern and central China. During the winters of 2009-2010 and 2010-2011, the Northern Hemisphere measured its second and third largest snow cover levels on record.

    ," said Judith Curry, chair of the School of Earth and Atmospheric Sciences at Georgia Tech. "The circulation changes result in more frequent episodes of atmospheric blocking patterns, which lead to increased cold surges and snow over large parts of the northern continents."

    These maps show the differences in Arctic sea ice concentration relative to the long-term average for the winters of (A) 2007-2008, (B) 2008-2009, (C) 2010-2011 and (D) 2010-2011. The lowest levels of Arctic sea ice have been measured between 2007 and 2011, with the record low occurring in 2007. Credit: Georgia Tech/Jiping Liu

    The researchers analyzed observational data collected between 1979 and 2010 and found that a decrease in autumn Arctic sea ice of 1 million square kilometers -- the size of the surface area of Egypt -- corresponded to significantly above-normal winter snow cover in large parts of the northern United States, northwestern and central Europe, and northern and central China.

    The analysis revealed two major factors that could be contributing to the unusually large snowfall in recent winters -- changes in atmospheric circulation and changes in atmospheric water vapor content -- which are both linked to diminishing Arctic sea ice. Strong warming in the Arctic through the late summer and autumn appears to be enhancing the melting of sea ice.

    "We think the recent snowy winters could be caused by the retreating Arctic ice altering atmospheric circulation patterns by weakening westerly winds, increasing the amplitude of the jet stream and increasing the amount of moisture in the atmosphere," explained Jiping Liu, a senior research scientist in the School of Earth and Atmospheric Sciences at Georgia Tech. "These pattern changes enhance blocking patterns that favor more frequent movement of cold air masses to middle and lower latitudes, leading to increased heavy snowfall in Europe and the Northeast and Midwest regions of the United States."

    This map shows the percent change in winter blockings relative to the long-term average. Blocking patterns favor more frequent movement of cold air masses to middle and lower latitudes, leading to increased heavy snowfall in Europe and the Northeast and Midwest regions of the United States. Credit: Georgia Tech/Jiping Liu

    In addition to analyzing observational data, the researchers also assessed the impact of the diminishing Arctic sea ice on atmospheric circulation by comparing the results of model simulations run with different sea ice distribution. They ran one experiment that assumed seasonally varying Arctic sea ice and utilized sea ice concentration data collected between 1979 and 2010. Another simulation incorporated prescribed sea ice loss in autumn and winter based on satellite-derived Arctic sea ice concentrations.

    The simulations showed that diminishing Arctic sea ice induced a significant surface warming in the Arctic Ocean and Greenland/northeastern Canada, and cooling over northern North America, Europe, Siberia and eastern Asia. The models also showed above-normal winter

    Huijun Wang and Mirong Song of the Chinese Academy of Sciences Institute of Atmospheric Physics and Radley Horton from the Columbia University Center for Climate Systems Research also contributed to this work.

    This is ridiculous. The large snows do not happen in the summer or fall. They happen in the middle of winter, when there is no open water in the arctic. Just how stupid do they think that people are?

    This is ridiculous. The large snows do not happen in the summer or fall. They happen in the middle of winter, when there is no open water in the arctic. Just how stupid do they think that people are?

    However, since this is only temporary and seasonal from cloud cover or snow packs, it is not big enough to offset the CO2 feed-backs, nor the positive feedback from loss of albedo in glaciers or sea ice.

    This effect will only grow to certain limits before positive feed-backs completely overwhelm it due to continental melting day anomalies eventually becoming so high that snow can't form, or at least can't survive on the surface long enough to matter.

    You are cherry picking one year, 1998, and noticing that most of the years since then were slightly cooler, while ignoring the fact that all but 2 of the years since then are well above the previous records.

    He always cherry picks based on 1998...it's all he has in his repetoire besides the MWP and 3 point graphs drawn by children. For everything else he will simply make a statement of fact that has no scientific merit or observational back-up....because such things do not exist.

    "Two researchers here spent months scouring through old expedition logs and reports, and reviewing 70-year-old maps and photos before making a surprising discovery: They found that the effects of the current warming and melting of Greenland's glaciers that has alarmed the world's climate scientists occurred in the decades following an abrupt warming in the 1920s."

    So NotParker - what is ur point? Here is a quote from the article you referenced regarding warming in the 20's. "The fact that recent changes to Greenland's ice sheet mirror its behavior nearly 70 years ago is increasing researchers' confidence and alarm as to what the future holds" Is that kind of what you were getting at?

    The obvious is again sailing over your head NP. Winter temperature data for the contigous US, not overall yearly, not Alaska, just winter and only according to this one graph that is posted and labeled, but has no commentary attached. The overall yearly is a plateau between 1998 and 2011, a plateau higher than every year preceding it except for one. Your graph is not useful as it is for a season in a specific area. I could link summer temperature data for texas and oklahoma and show an average rise of over 7 degrees for the same time frame, but from that I wouldn't be idiotic enough to make the statement that "IT" (being earth) has warmed by over 7 degrees....but at least you attempted to find something different than the usual rhetoric....

    "12 Mar 10 - The United States just experienced its coldest winter in 25 years, since 1984-1985, according to the National Climatic Data Center, and the 18th coldest winter in the contiguous U.S. over the past 115 years. It was also the 19th wettest."

    Is a complete fallacy which is actually proved, once again by the link you posted to support it. If the average temperature dropped 4.2 degrees in the winter over the timeline of the graph, then for the statement that the US is cooling to be true, overall temperature measurements would have to reflect this drop. Since there hasn't been a drop in year round temperatures, the other seasons would have to offset this with warmer than usual temperatures. The winters (according to your link) are colder but the average year round isn't, hence the statement that the US is cooling is not true. This is why I mentioned the plateau bookended by 1998 and 2011.

    If the average temperature dropped 4.2 degrees in the winter over the timeline of the graph, then for the statement that the US is cooling to be true, overall temperature measurements would have to reflect this drop.

    "The first two months of the winter season, December and January, have been much warmer than average for the contiguous United States. The two-month period was the fourth warmest on record with an average temperature 3.8 degrees F above average."

    Our findings support a previous study suggesting that the impact of anthropogenic climate warming on Arctic sea ice became detectable from the early 1990s onwards(19). The present decline in sea ice is occurring at a pace seen in earlier episodes, but the sustained trend (now nearly 50 years long) is unprecedented in the 1,450-year reconstruction period presented here.

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