| 摘要: |
| 依据再分析的海洋温度、盐度月平均资料和观测的热通量资料, 确定了北太平洋中纬度晚冬海表温度(SST)持续异常现象较明显的海域是位于38°—42°N, 158°E—172°W 的西部海域和位于35°—42°N, 172°W—145°W 的东部海域。分析结果表明, 西部海域, 晚冬SST 持续异常现象的主要机制是海洋上混合层的“再现机制”; 而东部海域晚冬SST 的持续异常现象主要是海面净热通量的持续异常所致。由于冬季北太平洋西风异常导致的上混合层深度季节的差异在1976 年前后的不同,1976 年后晚冬混合层深度深, “再现机制”的作用明显, SST 持续异常现象更容易出现。
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| 关键词: 海表温度, 再现机制, 热通量, 年代际变化 |
| DOI：10.11693/hyhz200904004004 |
| 分类号: |
| 基金项目:国家自然科学基金项目, 40830106 号和40676010 号；国家重点基础研究发展规划(973)项目：北太平洋副热带环流变异及其对我国近海动力环境的影响, 2007CB411803 号 |
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| ANALYSIS OF FORMATION MECHANISM ABOUT SST ANOMALY PERSISTENCE DURING LATE WINTER IN THE NORTH PACIFIC |
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CHEN Ru, LIU Qin-Yu, HU Hai-Bo
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Physical Oceanography Laboratory & Ocean-Atmosphere Interaction and Climate Laboratory, Ocean University of China
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| Abstract: |
| Based on the reanalysis data (monthly mean of temperature and salinity) and observation data (monthly mean of heat flux), it is detected that in the west area(38°—42°N, 158°E—172°W) and the east area (35°—42°N, 172°—145°W), the late winter Sea Surface Temperature Anomaly(SSTA) persists quite well. The formation mechanism for persistence phenomenon of SSTA is analyzed in both areas. It is found that the “reemergence mechanism” of the mixed layer is dominating formation mechanism of the SSTA persistence phenomenon in west area; while the contributes of heat flux persistence anomalies is dominating for the persistence of late winter SST anomalies in east area. In addition, in west area, considering the decadal variability of the seasonal different of the mixed layer depth, the role of “reemergence mechanism” is more important after the 1976 climate shift due to the increase of the seasonal different of mixed layer depth by the intensification of the westerly in the North Pacific.
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| Key words: Sea Surface Temperature, Reemergence mechanism, Heat flux, Decadal variability |
