On the Association between Spring Arctic Sea Ice Concentration and Chinese Summer Rainfall： A Further Study

In our previous study,a statistical linkage between the spring Arctic sea ice concentration(SIC)and the succeeding Chinese summer rainfall during the period 1968–2005 was identified.This linkage is demonstrated by the leading singular value decomposition(SVD)that accounts for 19%of the co-variance.Both spring SIC and Chinese summer rainfall exhibit a coherent interannual variability and two apparent interdecadal variations that occurred in the late 1970s and the early 1990s.The combined impacts of both spri...

On the association between spring Arctic sea ice concentration and Chinese summer rainfall: A further study

In our previous study, a statistical linkage between the spring Arctic sea ice concentration(SIC) and the succeeding Chinese summer rainfall during the period 1968--2005 was identified. This linkageis demonstrated by the leading singular value decomposition (SVD) that accounts for 19% of the co-variance.Both spring SIC and Chinese summer rainfall exhibit a coherent interannual variability and two apparentinterdecadal variations that occurred in the late 1970s and the early 1990s. The combined impacts of bothspring Arctic SIC and Eurasian snow cover on the summer Eurasian wave train may explain their statisticallinkage. In this study, we show that evolution of atmospheric circulation anomalies from spring to summer,to a great extent, may explain the spatial distribution of spring and summer Arctic SIC anomalies, and isdynamically consistent with Chinese summer rainfall anomalies in recent decades. The association betweenspring Arctic SIC and Chinese summer rainfall on interannual time scales is more important relative tointerdecadal time scales. The summer Arctic dipole anomaly may serve as the bridge linking the springArctic SIC and Chinese summer rainfall, and their coherent interdecadal variations may reflect the feedbackof spring SIC variability on the atmosphere. The summer Arctic dipole anomaly shows a closer relationshipwith the Chinese summer rainfall relative to the Arctic Oscillation.