1979-2013年北太平洋海表面盐度变化与淡水通量的关系
投稿时间:2019-03-01  修订日期:2019-04-08  点此下载全文
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作者单位E-mail
魏翔 南京信息工程大学 15261820883@163.com 
智海 南京信息工程大学大气科学学院 zhihai@nuist.edu.cn 
方祝骏 南京信息工程大学大气科学学院  
基金项目:助项目:国家重点研发计划“重大自然灾害监测预警与防范”重点专项项目资助(编号:2018YFC1506002).国家自然科学基金(编号:41690122,41690120)。
中文摘要:针对北太平洋的海表面盐度(SSS: Sea Surface Salinity)变化,利用SODA3.3.1(Simple Ocean Data Assimilation)再分析资料进行分析。结果表明:(1)1914-2013年SSS变化存在增加趋势,并出现以30年为周期的年代际变化,分析SSS的趋势变化,发现1979年后,SSS变化与1914-2013年SSS变化相反,存在减小趋势,并出现7-12年的周期。(2)北太平洋SSS变化的活跃区域分别位于黑潮及其延伸区(A区)与北太平洋中部偏东地区(B区),两个区域均能代表北太平洋的SSS时间变化特征。A区域与B区域,在2000年前SSS存在减小的趋势,在2000-2009年出现明显的增长趋势。将A区域与B区域作为研究北太平洋SSS的关键区域。(3)A区域和B区域SSS与北太平洋淡水通量(FWF: Fresh Water Flux)显著相关,分析A区域与B区域SSS与FWF的关系,从关键区域SSS与局地FWF的关系上分析,A区域SSS受到局地FWF影响较大,最大相关系数为FWF超前16个月时,数值为0.56。B区域SSS受到局地FWF影响较小,其相关性为FWF超前20个月,数值为-0.21。从北太平洋的FWF与关键区域的SSS关系上看,A区域SSS与FWF存在较大范围的正值区,主要正值区域在黑潮延伸区也就是A区的东部,其中最高值区域位于太平洋中部的位置,最大值为0.82(通过0.01显著性水平),大值区域随着FWF超前的时间越来越短,相关关系的大值区域向东移动。B区域SSS与北太平洋中部存在正相关,正相关最显著区域大致位于B区的西侧,最大值为0.81(通过0.01显著性水平),正相关区域并没有发生偏移。通过本文的分析,我们进一步了解在北太平洋,SSS存在年代际变化,关键区域的盐度变化能够表征北太平洋的气候变率,同时也可以作为北太平洋FWF变化的指示剂。
中文关键词:海表盐度变化,淡水通量,北太平洋
 
Sea Surface Salinity Variability from 1979 to 2013 and its Relationship with Fresh Water Flux in the Northern Pacific
Abstract:The sea surface salinity (SSS) is analyzed by using SODA (version: 3.3.1) reanalysis data in the northern Pacific. Results illustrate that: (1) In the northern Pacific salinity trends to be increased from 1914 to 2013 with 30-year variability period. However, after 1979, SSS presents decreased tendency with 7-to-12-year period in the northern Pacific. (2) There are two key regions of SSS variability in the northern Pacific, which are located in the middle of the northern Pacific (A) and the middle East (B). Both the two regions can indicate the temporal change in the northern Pacific SSS. (3) The SSS in the key regions are significantly related to the fresh water flux (FWF) in the northern Pacific. SSS in the region A is greatly affected by the local FWF, and the maximum correlation coefficient is 0.56 when FWF leads 16 month. While in the region B, the relationship between SSS and the local FWF is not significant, with the value of -0.21 and 20-month leading of the FWF. In addition, SSS and FWF have positive correlation in the region A. The main positive area occurred in the eastern extension part of the Kuroshio, with the peak value located at the middle of the northern Pacific. The large-value area moved eastward with the shortening time of leading FWF phase. SSS in the region B is positively related to that of the central northern Pacific. The most significant area is located west of the region B without shifting. In our study, it can be concluded that in the northern Pacific SSS oscillation exist obvious inter-decadal features and SSS climate variability in the northern Pacific can be represented by the changes of SSS in the key areas. Furthermore, it can also be served as an index of the FWF variability in the northern Pacific.
keywords:Sea Surface Salinity Variability, Fresh Water Flux, Northern Pacific
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