热带西太平洋暖池局地海气相互作用的季节依赖性  

SEASONAL DEPENDENCE OF LOCAL AIR-SEA INTERACTION OVER THE TROPICAL WESTERN PACIFIC WARM POOL

作　　者：郑建秋[1] 任保华[1] 李根[1] 杨成昀[1] 

机构地区：[1]中国科学技术大学地球和空间科学学院,安徽合肥230026

出　　处：《热带气象学报》2012年第6期853-860,共8页Journal of Tropical Meteorology

基　　金：国家重点基础研究发展计划项目(2012CB417403);中科院战略先导专项(XDA05090402);安徽省自然科学基金项目(1208085QD75);中科院海洋环流与波动重点实验室开放基金(KLOCAW1204)共同资助

摘　　要：采用美国伍兹霍尔海洋研究所的客观分析海气通量项目最新发布的海气热通量和相关气象场、NOAA提供的向外长波辐射和表面风场等数据,研究了暖池区域(144～154°E,1～6°N)局地海气相互作用的季节依赖性,并探讨可能对其产生影响的外强迫。结果表明,暖池区域海气相互作用在3月显著表现为受ENSO影响的海洋对大气的强迫,而在6月则显著表现为以局地作用为主的大气对海洋的反馈。当海洋强迫大气占主导时,海温趋势(dSST/dt)的年际变化的数值小于海温;而当大气反馈海洋占主导时,海温趋势的年际变化数值大于海温。ENSO会减弱暖池区域3月海洋对大气的强迫,而6月大气对海洋的反馈受ENSO影响不大;去除印度洋偶极子(IOD)影响后海气关系基本维持不变。3月ENSO通过增强暖池上空的对流,减少短波入射,从而使海温呈降低趋势,减弱海洋对大气的强迫。Based on the air-sea interface heat fluxes and related meteorological variables datasets recently released by Objectively Analyzed Air-sea Fluxes （OA Flux） Project of Woods Hole Oceanographic Institution, as well as the outgoing longwave radiation and surface wind datasets from National Oceanic and Atmospheric Administration, the seasonal dependence of local air-sea interaction over the tropical western Pacific warm pool （referred to the region （144～154°E,1-6°N）） are revealed and the remote forcing＇s probable impacts on the air-sea interaction are examined. The results indicated the dominance of oceanic forcing with the significant impact of ENSO in March and that of atmospheric forcing without the notable influence of remote forcing in June. While the interannual variability of sea surface temperature anomaly （SSTA） is larger than that of SSTA tendency in the case that oceanic forcing is dominant, the opposite is true when atmospheric forcing is dominant. The magnitude of the oceanic forcing of the atmosphere tends to decrease in March with the occurrence of ENSO, though ENSO has little influence on the atmospheric feedback to the ocean in June. The local air-sea interaction is substantially the same before and after the removal of the effect of Indian Oceanic Dipole. The reduction of shortwave radiation fluxes into the western Pacific warm pool, due to the enhanced overlaying convection in March associated with ENSO, leads to the decline of SST tendency that will weaken the oceanic forcing of the atmosphere.

关 键 词：气候学 海气相互作用 回归分析 暖池 海温 向外长波辐射 

分 类 号：P732.5[天文地球—海洋科学]