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2015/11/10 14:00 Prof. Chung-Hsiung Sui（Department of Atmospheric Sciences, NTU）
Seminar
Poster： ╱ Post date：2015-11-03NCU IHOS Seminar Announcemnet
Speaker：Prof. Chung-Hsiung Sui
Place：S-325, Science Building 1
Abstract：
Title：An Analysis of the Linkage of Pacific Subtropical Cells with the Recharge-discharge Processes in ENSO Evolution
Speaker：Prof. Chung-Hsiung Sui
Department of Atmospheric Sciences, NTU
Time：11/10（Tue.）14：00
Place：S-325, Science Building 1
Abstract：
The Simple Ocean Data Assimilation (SODA 2.2.4) analysis for the period of 1960-2010 is used to study the variability of Pacific Subtropical Cells (STCs) and its causal relation with tropical climate variability. Result shows that the interior STCs transport into the equatorial basin through 9°S and 9°N is well connected with equatorial Sea surface temperature (SST) (9°S-9°N, 180°-90°W). The highest correlation at interannual timescales is contributed by the western interior STCs transport within 160°E and 130°W. It is know that the ENSO recharge-discharge cycle experiences five stages, i.e., the recharging stage, recharged staged, warmest SST stage, discharging stage and discharged stage. A correlation analysis of interior STCs transport convergence, equatorial warm water volume (WWV), wind stress curl and SST identifies time interval between the five stages, which are 8, 10, 2 and 8 months, respectively. A composite analysis for El Niño and La Niña developing events is also performed. The composited ENSO evolutions are in accordance with the recharge-discharge theory and the corresponding time lags between the above denoted five stages are 4~12, 6, 2, and 4 months. For stronger El Niño events, the discharge due to interior STCs transport at 9°N terminates earlier than that at 9°S due to the southward migration of westerly winds following the El Niño peak phase. This study clarifies subsurface transport processes and their time intervals, which are useful for refinement of theoretical models and for evaluating couple ocean-atmosphere general circulation model results.
Last modification time：2015-10-20 AM 10:48
