大气科学2017，Vol.41Issue(6)：1316-1331,16.DOI:10.3878/j.issn.1006-9895.1702.16257
不同太平洋年代际振荡和ENSO位相下大气水分收支变化对北半球冬季太平洋蒸发量的影响
Effects of Moisture Budget Changes on Pacific Evaporation Associated with Pacific Decadal Oscillation and ENSO in Boreal Winter
摘要
Abstract
This study assesses the influence of E1 Ni(n)o-Southem Oscillation (ENSO) and Pacific decadal oscillation (PDO) on the distribution of the Pacific evaporation anomaly in boreal winter during 1958-2015 by using Objectively Analyzed air-sea Fluxes (OAFlux) data.Furthermore,we also examine contributions of individual water budget terms in the moisture balance equation to the evaporation anomaly.The results show that the winter evaporation over the eastern tropical Pacific,the subtropical northwestern Pacific,and central northern Pacific are significantly influenced by ENSO.The water vapor is anomalously divergent (convergent) over the central northern Pacific during E1 Ni(n)o (La Ni(n)a),which increases (decreases) the atmospheric water vapor content and enhances (reduces) evaporation.However,the anomalous water vapor convergence (divergence) leads to evaporation decrease (increase) over the subtropical northwestern Pacific.Besides,the increase (decrease) in rainfall results in evaporation increase (decrease) over the eastern tropical Pacific.Meanwhile,this relationship between ENSO and evaporation anomaly is not stationary over those areas and can bemodulated by PDO.When E1 Ni(n)o (La Nifia) is accompanied with warm (cold) PDO phase,the increase (decrease) in evaporation obvious intensifies over the central northern Pacific mainly due to the increased (decreased) atmospheric water vapor content caused by the increase (decrease) in rainfall,and the storm track is abnormally stronger (weaker).When E1 Ni(n)o (La Ni(n)a) is accompanied with cold (warm) PDO phase,the decrease (increase) in obviously intensifies over the subtropical northwestern Pacific and tropical eastern Pacific,which is related to the enhancement of anomalous moisture advection caused by humidity changes.关键词
太平洋年代际振荡(PDO)/厄尔尼诺—南方涛动(ENSO)/太平洋冬季蒸发量/水汽收支方程/风暴轴Key words
Pacific decadal oscillation (PDO)/E1 Ni(n)o-Southern Oscillation (ENSO)/Wintertime Pacific evaporation/Moisture budget equation/Storm track分类
天文与地球科学引用本文复制引用
韩子轩,苏涛,支蓉,封国林..不同太平洋年代际振荡和ENSO位相下大气水分收支变化对北半球冬季太平洋蒸发量的影响[J].大气科学,2017,41(6):1316-1331,16.基金项目
国家自然科学基金项目41530531、 41375078、 41575074,国家重点基础研究发展计划(973计划)项目2013CB430204 National Natural Science Foundation of China (NSFC) (Grants 4153053l,41375078,41575074),National Basic Research Program of China (973 Program) (Grant 2013CB430204) （973计划）
