INTERANNUAL VARIATIONS OF ATMOSPHERIC HEAT SOURCES ANDMOISTURE SINKS OVER THE EQUATORIAL PACIFIC AND THEIRRELATIONS TO THE SST ANOMALIES

LAN Guang-dong; WEN Zhi-ping; HE Hai-yan

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 anomaly and the SST anomaly, and between the vertically integrated moisture sink anomaly 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 –C0.59. In other layers the positive correlation between the interannual variations of Q1, Q2 and the SST are weak in the western Pacific.

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LAN Guang-dong, WEN Zhi-ping, HE Hai-yan. INTERANNUAL VARIATIONS OF ATMOSPHERIC HEAT SOURCES ANDMOISTURE SINKS OVER THE EQUATORIAL PACIFIC AND THEIRRELATIONS TO THE SST ANOMALIES [J]. Journal of Tropical Meteorology, 2004, 10(2): 178-189.

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INTERANNUAL VARIATIONS OF ATMOSPHERIC HEAT SOURCES ANDMOISTURE SINKS OVER THE EQUATORIAL PACIFIC AND THEIRRELATIONS TO THE SST ANOMALIES

Monsoon and Environment Research Center, Department of atmospheric sciences, Zhongshan University

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 anomaly and the SST anomaly, and between the vertically integrated moisture sink anomaly 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 –C0.59. In other layers the positive correlation between the interannual variations of Q1, Q2 and the SST are weak in the western Pacific.

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INTERANNUAL VARIATIONS OF ATMOSPHERIC HEAT SOURCES ANDMOISTURE SINKS OVER THE EQUATORIAL PACIFIC AND THEIRRELATIONS TO THE SST ANOMALIES

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