Retrieving snow mass from GRACE terrestrial water storage change with a land surface model

[1] A reliable snow water equivalent (SWE) product is critical for climate and hydrology studies in Arctic regions. Passive microwave sensors aboard satellites provide a capability of observing global SWE and have produced many SWE datasets. However, these datasets have significant errors in boreal forest regions and where snowpack is deep or wet. The Gravity Recovery and Climate Experiment (GRACE) satellites are measuring changes in terrestrial water storage (TWS), of which snow mass is the primary component in winter Arctic river basins. This paper shows SWE can be derived from GRACE TWS change in regions where the ground is not covered by snow in a summer month if accurate changes in below-ground water storage (including soil water and groundwater) can be provided by a land surface model. Based on gravity change, the GRACE-derived SWE estimates are not affected by the boreal forest canopy and are more accurate in deep snow regions than microwave retrievals. The paper also discusses the uncertainties in the SWE retrievals.

[1]  F. Chapin,et al.  Role of Land-Surface Changes in Arctic Summer Warming , 2005, Science.

[2]  Zong-Liang Yang,et al.  An observation-based formulation of snow cover fraction and its evaluation over large North American river basins , 2007 .

[3]  R. Barry,et al.  Atmospheric Components of the Arctic Ocean Freshwater Balance and Their Interannual Variability , 2000 .

[4]  Suxia Liu,et al.  Evaluation of Global Soil Wetness Project Soil Moisture Simulations , 1999 .

[5]  Zhichang Guo,et al.  Evaluation of the Second Global Soil Wetness Project soil moisture simulations: 1. Intermodel comparison , 2006 .

[6]  Alfred T. C. Chang,et al.  Quantifying the uncertainty in passive microwave snow water equivalent observations , 2005 .

[7]  J. Famiglietti,et al.  Terrestrial water mass load changes from Gravity Recovery and Climate Experiment (GRACE) , 2006 .

[8]  S. Swenson,et al.  A comparison of terrestrial water storage variations from GRACE with in situ measurements from Illinois , 2006 .

[9]  Frédéric Frappart,et al.  Evolution of high‐latitude snow mass derived from the GRACE gravimetry mission (2002–2004) , 2006 .

[10]  Ki-Weon Seo,et al.  Optimized smoothing of Gravity Recovery and Climate Experiment (GRACE) time‐variable gravity observations , 2006 .

[11]  Peter E. Thornton,et al.  Technical Description of the Community Land Model (CLM) , 2004 .

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

[13]  David Robinson,et al.  Gridded North American monthly snow depth and snow water equivalent for GCM evaluation , 2003 .

[14]  Jeffrey P. Walker,et al.  THE GLOBAL LAND DATA ASSIMILATION SYSTEM , 2004 .

[15]  Zong-Liang Yang,et al.  Effects of Frozen Soil on Snowmelt Runoff and Soil Water Storage at a Continental Scale , 2006 .

[16]  David A. Robinson,et al.  Seasonal Variability of Northern Hemisphere Snow Extent Using Visible Satellite Data , 2000 .

[17]  M. Watkins,et al.  GRACE Measurements of Mass Variability in the Earth System , 2004, Science.

[18]  D. Hall.  Assessment of polar climate change using satellite technology , 1988 .

[19]  Daqing Yang,et al.  Streamflow response to seasonal snow cover extent changes in large Siberian watersheds , 2003 .

[20]  P. Xie,et al.  Global Precipitation: A 17-Year Monthly Analysis Based on Gauge Observations, Satellite Estimates, and Numerical Model Outputs , 1997 .

[21]  Zong-Liang Yang,et al.  Development of a simple groundwater model for use in climate models and evaluation with Gravity Recovery and Climate Experiment data , 2007 .

[22]  Victor Zlotnicki,et al.  Time‐variable gravity from GRACE: First results , 2004 .

[23]  Paul R. Houser,et al.  Factors affecting remotely sensed snow water equivalent uncertainty , 2005 .