Dynamics of water mass in the Central Siberia permafrost zone based on gravity survey from the grace satellites

作者：Im S T^*; Kharuk V I

来源：Izvestiya - Atmospheric and Oceanic Physics, 2015, 51(8): 806-818.

DOI：10.1134/S0001433815080046

• permafrost zone of Siberia
• gravimetric survey
• GRACE
• permafrost thawing

The GRACE gravimetric survey is applied to analyze the equivalent water mass anomalies (EWMAs) in the permafrost zone of Central Siberia. Variations in EWMAs are related to precipitation, air temperature, potential evapotranspiration, and soil composition (drainage conditions). The EWMA dynamics demonstrates two periods. The period of 2003-2008 is characterized by a positive trend. The one of 2008-2012 shows a decrease in the trend with a simultaneous increase by 30-70% of EWMA dispersion in the background of growth (up to 40%) of precipitation variability. The rate of water mass increment demonstrates a positive correlation with the sand and gravel contents in soil (r = 0.72) and a negative one with clay content (r =-0.69 to-0.77). For Taimyr Peninsula, there is a deficit of residual water mass (similar to 250 mm for the period of 2012-2013) indicating the deeper thawing of permafrost soils. In the Central Siberian Plateau, the indicator of more intensive permafrost thawing (and that of an increase in active layer thickness) is a considerable trend of water mass increase (2003-2008). The increasing trend of the largest Siberian rivers (Yenisei and Lena) is revealed in the period of 2003-2012.

• 出版日期2015-12