摘要:利用月平均的HadISST海表温度、NCEP再分析资料、OAFlux海表面热通量及相关物理量资料、NCAR/NOAA云量场资料，分析了热带太平洋海表热通量的年际特征，并且进一步分析了传统El Ni?o和El Ni?o Modoki事件中湍流热通量的异常演变特征以及影响因子。在热带太平洋上，净热通量的年际变化最大振幅出现在赤道太平洋上，且主要取决于潜热通量和短波辐射通量的变化。本文还利用两类ENSO事件旺盛期海温指数对不同时期海面热通量场的偏回归分析，考察了热带太平洋海表面热通量与两类ENSO事件中海温的联系。两类海温指数对各时期热带太平洋净热通量的回归均表现为赤道太平洋上存在显著的负异常，在Ni?o3指数偏回归下的负异常范围和强度都较El Ni?o Modoki指数回归的要大，且更偏于赤道东太平洋，而旺盛期海温对同期赤道东太平洋上湍流热通量的影响最大。
关键词:热带太平洋/
热通量/
传统El Ni?o/
El Ni?o Modoki
Abstract:Based on the atmospheric data from NCEP, sea surface temperature (SST) data from the Hadley Center, sea surface heat fluxes and related physical data from OAFlux, and cloud data from NCAR/NOAA, the characteristics of heat fluxes were analyzed over the tropical Pacific and then the different characteristics and influential factors of turbulent heat fluxes between two types of ENSO events were investigated. The main conclusions are as follows: The maximum amplitude of the net heat flux variation is found over the equatorial Pacific, which is mainly caused by variations of the latent heat flux and shortwave radiation flux. Using the SST indexes associated with two types of ENSO events, partial regressions are applied to investigate the influence of SST on the heat fluxes in every evolution stage. Negative anomalies of the net heat flux can be captured over the equatorial Pacific during the two types of ENSO events. However, the range and the amplitude of the anomalies are much broader and stronger over the equatorial Pacific under the partial regression of Ni?o3 than those of El Ni?o Modoki index (EMI). Besides, the SST of the maturing periods has the greatest impact on the contemporaneous turbulence heat fluxes over the equatorial eastern Pacific in both events.
Key words:Tropical Pacific/
Heat flux/
Traditional El Ni?o/
El Ni?o Modoki
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