THE INTERACTION BETWEEN WINTER MONSOON ACTIVITIES IN EAST ASIA AND SEA SURFACE TEMPERATURE VARIATIONS OVER THE WESTERN PACIFIC OCEAN

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  • 東アジアの冬季モンスーン活動と西部太平洋の海面水温との相互作用
  • ヒガシ アジア ノ トウキ モンスーン カツドウ ト セイブ タイヘイヨウ ノ

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The interaction between winter monsoon circulation features in East Asia and sea surface temperature (SST) variations over the western Pacific is examined. First, the relationship between diabatic heating term and horizontal or vertical advection term at the lowest layer (1, 000-850 mb) is investigated by applying the empirical orthogonal function (EOF) analysis on heat budget components over the western Pacific Ocean. Second, the atmospheric response and forcing power on the SST anomaly are discussed based on the composite analysis of SST, outgoing longwave radiation and horizontal motion associated with the strength of winter monsoon.<br> When the winter monsoon is active, negative SST anomalies exist in the mid-latitude region near Japan, but on the other side positive SST anomalies exist over the tropical region. Positive SST anomalies in the low latitudes enhance the strong connective activities over maritime continent. Contrastly, it is suggested that negative SST anomalies in the middle latitudes are mainly formed by heat loss of the ocean due to air-sea heat exchange and by the horizontal temperature advection within the mixing layer of the ocean. The anticyclonic (cyclonic) circulation at the 200 mb level over southern China is associated with the strong (weak) winter monsoon. This anomalous circulation seems to be coincided with one pole of the dipole pattern which has the center of circulation in both hemispheres. Thus, it is suggested that the strength of East Asian winter monsoon is partly controlled by the Matsuno-Gill type response model in which the strong convection over maritime continent acts as a heat source.

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