南极海冰异常对南半球冬春季大气环流影响的年代际变化 |
陈奕冰, 吴其冈 |
Interdecadal changes in the impacts of Antarctic sea ice anomalies on the Southern Hemisphere winter and spring atmospheric circulation |
Yibing CHEN, Qigang WU |
图1 1979—1999年(a)和2000—2021年(b)500 hPa 20°~90° S位势高度场异常和南极SIC异常的首要MCA时间序列间的平方协方差系数(横轴代表选取的位势高度场月份从5月到7月(MJJ)至12月到次年2月(DJF),纵轴代表海冰场滞后位势高度场的月份(记为lag),lag为负时代表选取前期的海冰和滞后的位势高度进行计算,lag为0时代表选取同期的海冰和位势高度;深(浅)阴影表示超过95%(90%)置信度月份) |
Fig. 1 The 1979—1999 (a) and 2000—2021 (b) squared covariance coefficient associated with the first MCA time series between anomaly fields of the Z500 (20°~90° S) and the Antarctic SIC as a function of seasons and lags. The x-axis denotes the months assigned to Z500, from May to July (MJJ) to December to February (DJF) of the following year. SIC leads Z500 at negative lags indicated (in months) on the y-axis. When the lag is negative, it represents the selection of previous sea ice and lagging geopotential heights for calculation. When lag is 0, it represents the selection of sea ice and geopotential heights for the same season. Shading indicates the 90% (heavy) and 95% (the most heavy) confidence levels |
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