Autumn Eurasian snow depth, autumn Arctic sea ice cover and East Asian winter monsoon

2014 ◽  
Vol 34 (13) ◽  
pp. 3616-3625 ◽  
Author(s):  
Fei Li ◽  
Huijun Wang
Keyword(s):  
Sea Ice ◽  
Snow Depth ◽  
East Asian Winter Monsoon ◽  
East Asian ◽  
Ice Cover ◽  
Winter Monsoon ◽  
Arctic Sea Ice ◽  
Asian Winter Monsoon ◽  
Eurasian Snow ◽  
Arctic Sea

Interannual variations of the dominant modes of East Asian winter monsoon and possible links to Arctic sea ice

2015 ◽  
Vol 47 (1-2) ◽  
pp. 481-496 ◽  
Author(s):  
Chenghu Sun ◽  
Song Yang ◽  
Weijing Li ◽  
Ruonan Zhang ◽  
Renguang Wu
Keyword(s):  
Sea Ice ◽  
East Asian Winter Monsoon ◽  
East Asian ◽  
Winter Monsoon ◽  
Arctic Sea Ice ◽  
Interannual Variations ◽  
Asian Winter Monsoon ◽  
Arctic Sea

scholarly journals On the Strengthened Relationship between the East Asian Winter Monsoon and Arctic Oscillation: A Comparison of 1950–70 and 1983–2012

2014 ◽  
Vol 27 (13) ◽  
pp. 5075-5091 ◽  
Author(s):  
Fei Li ◽  
Huijun Wang ◽  
Yongqi Gao
Keyword(s):  
Arctic Oscillation ◽  
East Asian Winter Monsoon ◽  
East Asian ◽  
Winter Monsoon ◽  
Arctic Sea Ice ◽  
Northern Eurasia ◽  
Tropical Region ◽  
Horizontal Structure ◽  
Near Surface ◽  
Asian Winter Monsoon

In this paper, the authors use NCEP reanalysis and 40-yr ECMWF Re-Analysis (ERA-40) data to document the strengthened relationship between the East Asian winter monsoon (EAWM) and winter Arctic Oscillation (AO) on the interannual time scale with a comparison of 1950–70 and 1983–2012. Their connection was statistically insignificant during 1950–70, whereas it was statistically significant during 1983–2012. The latter significant connection might be attributed to the East Asian jet stream (EAJS) upstream extension: the EAJS signal is relatively confined to the western North Pacific before the 1970s, whereas it extends westward toward East Asia after the 1980s. This upstream extension leads to the rearrangement of eastward-propagating Rossby waves with a much wider horizontal structure, thereby bonding the EAWM and the AO. Furthermore, the authors present observational evidence and model simulations demonstrating that the reduction of autumn Arctic sea ice cover (ASIC) is responsible for the strengthened EAWM–AO relationship after the 1980s by producing the EAJS upstream extension. After the 1980s, a strong anticyclonic anomaly over the polar ocean and anomalous easterly advection over northern Eurasia are generated by the near-surface heating over the Barents–Kara (B–K) Seas caused by the reduction of ASIC. This further induces cold anomalies over northern Eurasia, altering the meridional temperature gradient between the midlatitude and tropical region and consequently leading to westward penetration of the EAJS.

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