Relation between Circulation Characteristics in Beijing and Antecedent SST in North Pacific in Cold/Warm Winter Years
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Abstract:
The abnormality of temperature in Beijing, the corresponding atmospheric circulation characteristics, and the relation with the antecedent SST over Northern Pacific are analyzed with the data of temperature in Beijing, 500 hPa geopotential heights over the Northern Hemisphere, sealevel pressure and sea surface temperature (SST) over the North Pacific from 1951 to 2005. The winter temperature in Beijing had the following variation: lower in the 1950s and 1960s, gradually increasing since the 1970s, and remained high since the 1990s. The 500 hPa circulation characteristics in the previous and present periods are quite different. The intensities of the Northern Hemispheric Subtropical High and the relevant subtropical high cells can well reflect the winter temperature in Beijing. The abnormal SST variations on the westerly driftage area and the Southern equatorial ocean current area in the previous spring can be a signal to the abnormal low (high) temperature in Beijing. When SST on the Southern equatorial ocean current area in the previous spring is abnormally high, it is advantageous to the buildup of the favorable circulation for Beijing warm winter. When SST in the westerly driftage area in previous spring is abnormally low, it is favorable to the formation of the coldwinter circulation pattern in Beijing.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.