doi:  10.3878/j.issn.1006-9895.1805.18117
全球海洋蒸发量年代际变化归因:动力因子分析

Interdecadal changes in global ocean evaporation: dynamic factors analysis
摘要点击 836  全文点击 115  投稿时间:2018-01-22  修订日期:2018-04-13
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基金:  国家自然科学基金(41530531、41705053),国家重点基础研究发展计划项目(2017YFC1502300)
中文关键词:  海洋蒸发量  动力调整方法(PLS)  年代际转折  动力因子
英文关键词:  ocean evaporation  dynamical adjustment method (PLS)  interdecadal turning  dynamic factors
  
作者中文名作者英文名单位
黄必城huang bicheng兰州大学大气科学学院
引用:黄必城.2018.全球海洋蒸发量年代际变化归因:动力因子分析[J].大气科学
Citation:huang bicheng.2018.Interdecadal changes in global ocean evaporation: dynamic factors analysis[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      本文基于动力调整方法(PLS),利用OAFlux资料研究了1958~2016年全球海洋蒸发量变化及其动力作用和辐射强迫分量的变化,发现海洋蒸发量及其动力作用分量具有一致性年代际变化特征,特别是在20世纪70年代及90年代末期存在明显的年代际转折。进一步分析发现:主要动力因子有太平洋-北美遥相关型(PNA)、北极涛动(AO)、北大西洋涛动(NAO)、ENSO和阿留申低压(AL),并受到太平洋年代际振荡(PDO)的影响。其中,70年代末期的转折与PNA、PDO、ENSO和AL密切相关,而90年代末期的转折还与NAO变化有关。动力作用分量的前六个PLS模态解释方差达到67.5%,其中低纬北太平洋和印度洋蒸发异常主要与海表温度(SST)及其引起的环流异常有关,南太平洋、中纬北太平洋和北大西洋蒸发异常与环流异常直接相关。单因子相关分析发现SOI、NAO和PDO与海洋蒸发年代际变化密切相关。总体来说,动力作用分量在海洋蒸发的年代际变化中起主导作用,其中以ENSO、NAO和PDO的影响最大。
Abstract:
      Based on the dynamical adjustment method (PLS), variations of ocean evaporation and its dynamically induced and radiative forced components from 1958 to 2016 are studied by using OAFlux dataset. It is found that ocean evaporation and its dynamically induced components have consistent interdecadal change, especially transitions in the late 1970s and 1990s. Further analysis showed that mainly dynamic factors are Pacific-North America teleconnection (PNA), the Arctic Oscillation (AO), North Atlantic Oscillation (NAO), ENSO and Aleutian Low (AL), which affected by Pacific Decadal Oscillation (PDO). Among them, 1970s transition is closely related to PNA, PDO, ENSO and AL, while 1990s is also related to NAO. The first six PLS model deviations of dynamically induced components reach 67.5%. The anomalies of evaporation in the North Pacific and Indian Ocean at low latitudes are mainly related to SST and the circulation anomaly induced by SST. The evaporation anomalies in the South Pacific, North Pacific at middle latitudes and North Atlantic are directly related to anomalies of the circulation. Single factor correlation shows that the SOI, NAO and PDO changes coincide with the interdecadal variations of ocean evaporation. In general, the dynamically induced component dominates the interdecadal variability of ocean evaporation mainly by ENSO, NAO and PDO.
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