Characteristics of Eurasian snowmelt and its impacts on the land surface and surface climate
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The local hydrological and climatic impacts of Eurasian snowmelt are studied using advanced land surface and atmospheric data. It is found that intense melting of snow is located at mid-high latitudes in April and May. Snowmelt plays an important role in determining the seasonal cycles of surface runoff and soil moisture (SM). Specifically, melting is accompanied by sharp responses in surface runoff and surface SM while the impacts are delayed for deeper-layer of soil. This is particularly significant in the western sector of Eurasia. On interannual timescales, the responses of various surface parameters to snowmelt in the same month are rather significant. However, the persistence of surface SM anomalies is weak due to the strong soil evaporation anomalies and surplus of surface energy for evaporation. Strong impacts on the sensible heat flux, planetary boundary layer height and precipitation in the next month following the melting of snow are identified in west Russia and Siberia. Downward propagation of surface SM anomalies is observed and a positive evaporation–convection feedback is identified in west Russia. However, the subsequent impacts on the local convective precipitation in late spring-summer and its contribution to the total precipitation are seemingly weak. The atmospheric water vapor convergence has strong control over the total precipitation anomalies. Overall, snowmelt-produced SM anomalies are not found to significantly impact the late spring-summer local climate anomalies in Northern Eurasia. Therefore, the delayed remote-responses of atmospheric circulation and climate to the melting of Eurasian snow may be only possible near the melting period.
KeywordsEurasian snowmelt GLDAS Hydrological effects Climate anomalies Atmospheric circulation
This study is jointly supported by The Chinese University of Hong Kong—Focused Innovations Scheme (#1907001) and a Hong Kong Research Grants Council Grant (CUHK403612). The appointment of NCL at the Chinese University of Hong Kong is supported by the AXA Research Fund. We are grateful to two anonymous reviewers for their insightful comments on the manuscript and also to the editor for the help with the review process.
- Becker BD, Slingo JM, Ferranti L, Molteni F (2001) Seasonal predictability of the Indian summer monsoon: what role do land surface conditions play? Mausam 52(1):175–190Google Scholar
- Clark MP, Serreze MC, Robinson DA (1999) Atmospheric controls on Eurasian snow extent. Int J Climatol 19:27–40. https://doi.org/10.1002/(SICI)1097-0088(199901)19:1<27::AID-JOC346>3.0.CO;2-N CrossRefGoogle Scholar
- Koren V, Schaake J, Mitchell K, Duan QY, Chen F, Baker JM (1999) A parameterization of snowpack and frozen ground intended for NCEP weather and climate models. J Geophys Res Atmos (1984–2012) 104(19):569–585Google Scholar
- Koster RD, Suarez MJ (1996) Energy and water balance calculations in the Mosaic LSM. NASA Tech Memo 9:76Google Scholar
- Liu YQ, Avissar R (1999) A study of persistence in the land–atmosphere system using a general circulation model and observations. J Clim 12:2139–2153. https://doi.org/10.1175/1520-0442(1999)012<2139:ASOPIT>2.0.CO;2 CrossRefGoogle Scholar
- Ohmura A (2001) Physical basis for the temperature-based melt-index method. J Appl Meteorol 40:753–761. https://doi.org/10.1175/1520-0450(2001)040<0753:PBFTTB>2.0.CO;2.CrossRefGoogle Scholar
- Proulx RA, Knudson MD, Kirilenko A, Vanlooy AJ, Zhang X (2013) Significance of surface water in the terrestrial water budget: a case study in the Prairie Coteau using GRACE, GLDAS, Landsat, and groundwater well data. Water Resour Res 49:5756–5764. https://doi.org/10.1002/wrcr.20455 CrossRefGoogle Scholar
- Thompson DWJ, Wallace JM (2000) Annular modes in the extratropical circulation. Part I: month-to-month variability. J Clim 13:1000–1016. https://doi.org/10.1175/1520-0442(2000)013,1000:AMITEC.2.0.CO;2 CrossRefGoogle Scholar
- Vicente-Serrano SM, Grippa M, Le Toan T, Mognard N (2007) Role of atmospheric circulation with respect to the interannual variability in the date of snow cover disappearance over northern latitudes between 1988 and 2003. J Geophys Res 112:D08108. https://doi.org/10.1029/2005JD006571 CrossRefGoogle Scholar
- Wu WR, Dickinson RE (2004) Time scales of layered soil moisture memory in the context ofland–atmosphere interaction. J Clim 17:2752–2764. https://doi.org/10.1175/1520-0442(2004)017<2752:TSOLSM>2.0.CO;2 CrossRefGoogle Scholar