Abstract
We studied long-term variation of winter snowfall in Northeast China (NEC) for 1951–2010. Results show that NEC snowfall increased about 20% during 1986–2010 relative to 1951–1985. Further investigation suggests that the snowfall increase is closely associated with weakening of the East Asian winter monsoon (EAWM). The physical processes were portrayed by this research. Weakening of EAWM led to weakened cold air flow from the north, thus resulted in the warming of the surface ocean along the Northeast Asia coast and more water vapor evaporated from the ocean surface to the atmosphere and further transported to NEC. Also, because of EAWM weakening, more water vapor from south, east and west of NEC was transported to NEC, increasing water vapor content and hence snowfall there. From an atmospheric circulation viewpoint, EAWM weakening strengthened convergence at low levels and divergence at high levels, thereby favoring increased vertical convection and snowfall.
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Wang, H., He, S. The increase of snowfall in Northeast China after the mid-1980s. Chin. Sci. Bull. 58, 1350–1354 (2013). https://doi.org/10.1007/s11434-012-5508-1
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DOI: https://doi.org/10.1007/s11434-012-5508-1