西太平洋—南海地区潜热通量长期变化趋势的南北差异及成因分析

发布时间：2018-03-05 17:12

本文选题：南北差异　切入点：潜热通量　出处：《气候与环境研究》2016年04期 　论文类型：期刊论文

【摘要】：利用1958~2014年美国伍兹霍尔海洋研究所客观分析海气通量项目(OAFlux)的月平均潜热通量和相关气象要素数据,以及NCEP/NCAR再分析表面气压数据,通过Trend-EOF分析方法,本文研究了西太平洋—南海地区潜热通量的长期变化趋势。发现西太平洋—南海地区潜热通量整体呈上升的趋势,其中冬季上升趋势最强。冬季潜热通量趋势存在明显的南北差异,特别是在南海地区,南海北部为上升趋势而南部为下降趋势。南海北部以及菲律宾海地区冬季潜热通量上升的主要原因是海气比湿差的增大,而南海南部潜热通量呈下降趋势,在东侧主要原因是风速减小,在西侧主要原因是海气比湿差减小。南海潜热通量长期趋势的南北差异是风速和海气比湿差的共同作用造成的。另外,研究发现风速变化趋势受到局地环流变化的影响,在表面气压下降中心线以北地区为上升趋势,在其以南为下降趋势,而海气比湿差的变化趋势则主要取决于海表温度的变化趋势。
[Abstract]:Based on the monthly mean latent heat flux and related meteorological data of the Atmospheric Flux Project, the Woods Hall Institute of Oceanology, USA, from 1958 to 2014, and the NCEP/NCAR reanalysis of surface pressure data, the Trend-EOF analysis method was used to analyze the monthly mean latent heat flux and related meteorological elements. In this paper, the long-term variation trend of latent heat flux in the Western Pacific and South China Sea region is studied. It is found that the latent heat flux in the West Pacific and South China Sea region as a whole is on the rise. The trend of latent heat flux in winter is obviously different from north to south, especially in the South China Sea. The increase of latent heat flux in the northern part of the South China Sea and the Philippine Sea is mainly due to the increase of the specific humidity difference between the sea and air, while the latent heat flux in the south of the South China Sea is decreasing. In the east, the main reason is the decrease of wind speed, and the main reason in the west is the decrease of the specific humidity difference between sea and air. The north-south difference of the long-term trend of latent heat flux in the South China Sea is caused by the joint action of wind speed and the ratio of air to sea humidity. It is found that the trend of wind speed change is affected by the variation of local circulation, and the upward trend is found in the area north of the central line of the surface pressure descent, and the trend is decreasing to the south of the wind speed. The variation trend of sea-air ratio humidity difference mainly depends on the variation trend of Yu Hai's surface temperature.
【作者单位】：中国科学技术大学地球和空间科学学院;中国科学院南海海洋研究所热带海洋环境国家重点实验室;
【基金】：热带海洋环境国家重点实验室(中国科学院南海海洋研究所)开放课题LTO1502 国家重点基础研究发展计划项目2012CB417403~~
【分类号】：P732

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