bookmark_borderSnow Covered Desert

While snow coverage has been retreating in the Northeastern United States, the increased volatile weather systems being caused by global warming are causing it to snow in the desert.

Snow-Covered Desert

Snow-covered deserts are rare, but that’s exactly what the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite observed as it passed over the Taklimakan Desert in western China on Jan. 2, 2013. Snow has covered much of the desert since a storm blew through the area on Dec. 26. The day after the storm, Chinese Central Television (CNTV) reported that the Xinjian Uygyr autonomous region was one of the areas hardest hit.

The Taklimakan is one of the world’s largest—and hottest—sandy deserts. Water flowing into the Tarim Basin has no outlet, so over the years, sediments have steadily accumulated. In parts of the desert, sand can pile up to 300 meters (roughly 1,000 feet) high. The mountains that enclose the sea of sand—the Tien Shan in the north and the Kunlun Shan in the south—were also covered with what appeared to be a significantly thicker layer of snow in January 2013.

Snow In The Desert
Snow In The Desert

bookmark_borderNorthern Hemisphere Snow Cover is Retreating

PHILADELPHIA, PA — What is up with the weather? Yes, we have seen some freaky storms over the past few years. Global warming is expected to cause volatile weather patterns. Indeed, that is what we have been experiencing; however, overall the Northern Hemisphere is showing a steady decline in snowfall.

NOAA:

Northern Hemisphere Snow Cover Extent
Average of monthly snow cover extent anomalies over Northern Hemisphere lands (including Greenland) since Nov 1966. Right: Seasonal snow cover extent over Northern Hemisphere lands since winter 1966-67. Calculated from NOAA snow maps. From BAMS State of the Climate in 2009 report.

Northern Hemisphere average annual snow cover has declined in recent decades. This pattern is consistent with warmer global temperatures. Some of the largest declines have been observed in the spring and summer months.