Changes in snow cover characteristics over Northern Eurasia since 1966

Current snow state descriptions and estimates of major snow characteristics (snow cover duration, maximum winter snow depth, snow water equivalent) up to 2010 have been recorded from 958 meteorological stations in Russia. Apart from the description of long-term averages of snow characteristics, the estimates of their change that are averaged over quasi-homogeneous climatic regions are derived and regional differences in the change of snow characteristics are studied. In recent decades, the Russian territory has experienced an increase in snow depth, both winter average and maximum snow depths, against the background of global temperature rise and sea ice reduction in the northern hemisphere. The first generalized regional characteristics of maximum snow water equivalent in the winter season have been obtained. According to field observations, an increase in water supply has been revealed in the north of the East European Plain, in the western part by 4.5% (10 yr) − 1 and in the eastern part by 6% (10 yr) − 1. This characteristic also increases by ~ 6% (10 yr) − 1 in the southern forest zone of Western Siberia and in the Far East. Snow water equivalent in central Eastern Siberia increases by 3.4% (10 yr) − 1. From snow course observations in the forest, a tendency for a decrease in water supply (−6.4% (10 yr) − 1 is only found in the southwest of the East European Plain. Snow cover characteristics, being a product of several climate-forming factors that simultaneously affected them, change nonlinearly and different characteristics may and often do change differently with time. Therefore, one cannot assume that having information about the trend of one of the snow characteristics implies knowledge of the trend sign of others. In particular, whilst during the past four decades over the Russian Federation most snow cover characteristics—including the most important of them responsible for water supply—have increased, the only quantity that is reliably monitored from space (snow cover extent) has decreased, but in the last two decades this decrease has ceased. These tendencies are opposite to those observed in Canada and Alaska.

[1]  H. Ye,et al.  Changes in transitional snowfall season length in northern Eurasia , 2003 .

[2]  Molly O. Baringer,et al.  State of the Climate in 2008 , 2009 .

[3]  G. Gutman,et al.  Eurasian Arctic land cover and land use in a changing climate , 2011 .

[4]  Marika M. Holland,et al.  Perspectives on the Arctic's Shrinking Sea-Ice Cover , 2007, Science.

[5]  K. Trenberth,et al.  Observations: Surface and Atmospheric Climate Change , 2007 .

[6]  A. S. Bamzai,et al.  Relation between Eurasian Snow Cover, Snow Depth, and the Indian Summer Monsoon: An Observational Study , 1999 .

[7]  P. Groisman,et al.  Ongoing climatic change in Northern Eurasia: justification for expedient research , 2009 .

[8]  Jack Major,et al.  Handbook of Snow: Principles, Processes, Management and Use , 1983 .

[9]  V. F. Radionov,et al.  The snow cover of the Arctic basin , 1997 .

[10]  H. Ye.  Increases in snow season length due to earlier first snow and later last snow dates over north central and northwest Asia during 1937–94 , 2001 .

[11]  D. Robinson,et al.  Global Snow Cover Monitoring: An Update , 1993 .

[12]  B. Ramsay,et al.  The interactive multisensor snow and ice mapping system , 1998 .

[13]  J. Lawrimore,et al.  4.8. CONTEMPORARY CLIMATE CHANGES IN HIGH LATITUDES OF THE NORTHERN HEMISPHERE: DAILY TIME RESOLUTION , 2002 .

[14]  H. Melling,et al.  Canadian cryospheric response to an anomalous warm summer: A synthesis of the climate change action fund project “the state of the arctic cryosphere during the extreme warm summer of 1998” , 2006 .

[15]  J. Kohler,et al.  A long-term Arctic snow depth record from Abisko, northern Sweden, 1913–2004 , 2006 .

[16]  Thomas M. Smith,et al.  Averaging of Meteorological Fields , 1997 .

[17]  Z. Bao,et al.  Eurasian snow conditions and summer monsoon rainfall over South and Southeast Asia: Assessment and comparison , 2005 .

[18]  O. Bulygina,et al.  Snow cover basal ice layer changes over Northern Eurasia since 1966 , 2010 .

[19]  Ross D. Brown,et al.  Northern Hemisphere Snow Cover Variability and Change, 1915-97. , 2000 .

[20]  F. Zwiers,et al.  Human-Induced Arctic Moistening , 2008, Science.

[21]  Assessing Surface–Atmosphere Interactions Using Former Soviet Union Standard Meteorological Network Data. Part II: Cloud and Snow Cover Effects , 1997 .

[22]  O. Bulygina,et al.  Changes in snow cover over Northern Eurasia in the last few decades , 2009 .

[23]  G. Stenchikov,et al.  Changes of Snow Cover, Temperature, and Radiative Heat Balance over the Northern Hemisphere , 1994 .

[24]  David A. Robinson,et al.  Northern Hemisphere spring snow cover variability and change over 1922–2010 including an assessment of uncertainty , 2010 .

[25]  D. Levinson,et al.  State of the Climate in 2007 , 2008 .

[26]  H. Ye.  Quasi-Biennial and Quasi-Decadal Variations in Snow Accumulation over Northern Eurasia and Their Connections to the Atlantic and Pacific Oceans , 2001 .

[27]  D. Easterling,et al.  Trends in Intense Precipitation in the Climate Record , 2005 .

[28]  Thomas R. Karl,et al.  State of the ground : Climatology and changes during the past 69 years over northern eurasia for a rarely used measure of snow cover and frozen land , 2006 .