| 摘要: |
| 利用ECMWF(1979～1993年)的再分析资料计算分析了热带太平洋上空大气热源及水汽汇的年际变化及其与海表温度异常之间的联系。通过SVD的分析,发现大气热源的垂直积分〈Q1〉和水汽汇垂直积分〈Q2〉异常与SST异常有着较高正相关关系的热带太平洋区域主要集中在170 E以东的5 S～5 N之间的一个狭长带中。分析大气热源和水汽汇的空间结构,则发现在赤道太平洋中、东部地区,除了最低层(962.5 hPa)和最高层(85 hPa)以外,对流层其余各层Q1、Q2异常与SST异常都存在较高的正相关关系;而在赤道西太平洋地区,850 hPa层以下,Q1异常与SST异常为负相关关系,在962.5 hPa相关系数甚至为 -0.59,其余各层Q1、Q2异常与SST异常也只有很弱的正相关关系。 |
| 关键词: 热带太平洋 海表温度异常 大气热源 水汽汇 |
| DOI： |
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| 基金项目:国家自然科学基金(NSFC)项目“南海夏季风建立迟早年际变化的机理研究”(40275026 );《国家重点基础 研究发展规划项目》(973项目)我国重大气候灾害的形成机理和预测研究(G1998040900) |
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| INTERANNUAL VARIATIONS OF ATMOSPHERIC HEAT SOURCES AND MOISTURE SINKS OVER THE EQUATORIAL PACIFIC AND THEIR RELATIONS TO THE SST ANOMALIES |
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LAN Guang-dong, WEN Zhi-ping, HE Hai-yan
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Monsoon and Environment Research Center, Zhongshan University, Guangzhou 510275, China
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| Abstract: |
| The interannual variations of atmospheric heat sources and moisture sinks over the Equatorial Pacific and their relations with the SST anomalies are studied using ECMWF reanalysis data from 1979 to 1993. It is found by singular value decomposition (SVD) analysis that the region in the tropical Pacific with high positive correlation between the vertically integrated heat source <Q1>nomaly and the SST anomaly, and between the vertically integrated moisture sink <Q2>nomaly and the SST anomaly, is mainly located in a long and narrow belt to the east of 170 E between 5 S and 5 N. The analysis of the vertical structure of atmospheric heat sources and moisture sinks shows that the interannual variations of Q1, Q2 and SST in the equatorial central and eastern Pacific are strongly and positively correlated in the whole troposphere except the bottom (962.5 hPa) and the top (85 hPa) layers. However, in the western Pacific, the interannual variations of Q1 below 850 hPa is negatively related to the SST. The correlation coefficient at the level 962.5 hPa reaches even 0.59. In other layers the positive correlation between the interannual variations of Q1, Q2 and the SST are weak in the western Pacific. |
| Key words: the tropical Pacific sea surface temperature anomaly atmospheric heat source moisture sink |
