| 1979—2013年北太平洋海表面盐度变化及其与淡水通量的关系 |
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| 引用本文： | 魏翔,智海,方祝骏.1979—2013年北太平洋海表面盐度变化及其与淡水通量的关系[J].大气科学学报,2021,44(5):754-763. |
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| 作者姓名： | 魏翔 智海 方祝骏 |
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| 作者单位： | 南京信息工程大学 大气科学学院, 江苏 南京 210044 |
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| 基金项目： | 国家重点研发计划重大自然灾害监测预警与防范重点项目（2019YFC1510004） |
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| 摘 要： | 利用海洋再分析资料，对北太平洋海表面盐度（Sea Surface Salinity，SSS）变化及其与淡水通量（Fresh Water Flux，FWF）的关系进行研究。结果表明：1914—2013年SSS存在增大趋势，且有25～30 a的周期变化；1979—2013年SSS存在先减小后增大趋势，且有7～12 a的周期变化。北太平洋SSS变化的活跃区域位于黑潮及其延伸区（A区）和北太平洋中部偏东地区（B区）。A区和B区SSS在2000年之前存在减小趋势，在2000—2009年出现明显增大趋势。A区和B区SSS变化与北太平洋FWF变化显著相关，其中A区SSS受局地FWF影响较大（最大相关系数出现在FWF超前16个月），B区SSS受局地FWF影响较小（最大相关系数出现在FWF超前20个月）。北太平洋FWF与A区SSS的相关表明：它们存在较大范围的正相关区，正相关区主要位于黑潮延伸区（A区东部），且正相关大值区随着FWF超前时间缩短而向东移动。对应于北太平洋温度年代际变化，SSS也存在显著的年代际变化，并且北太平洋关键区盐度变化能够表征北太平洋气候变率，它可以作为北太平洋气候变率的替代指数。
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| 关 键 词： | 海表盐度变化 淡水通量 北太平洋 |
| 收稿时间： | 2019/3/1 0:00:00 |
| 修稿时间： | 2019/5/8 0:00:00 |
Sea surface salinity variation in North Pacific and its relationship with fresh water flux from 1979 to 2013 |
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| WEI Xiang,ZHI Hai,FANG Zhujun.Sea surface salinity variation in North Pacific and its relationship with fresh water flux from 1979 to 2013[J].大气科学学报,2021,44(5):754-763. |
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| Authors: | WEI Xiang ZHI Hai FANG Zhujun |
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| Institution: | School of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China |
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| Abstract: | Using ocean reanalysis data, this paper studies the variation of sea surface salinity (SSS) in the North Pacific and its relationship with fresh water flux (FWF).Results show that SSS has an increasing trend from 1914 to 2013, with a periodic change of 25-30 a;From 1979 to 2013, SSS decreases first and then increases, with a periodic change of 7-12 a.The active areas of SSS variation in the North Pacific are located in the Kuroshio and its extension area (Area A) and the eastern central North Pacific (Area B).SSS in Area A and Area B shows a decreasing trend before 2000 and an obvious increasing trend from 2000 to 2009.Variations of SSS in Area A and Area B are significantly correlated with variation of FWF in the North Pacific.SSS in Area A is greatly affected by local FWF (The maximum correlation coefficient is 0.56 when FWF leads 16 months), and SSS in Area B is less affected by local FWF (The maximum correlation coefficient absolute value is 0.21 when FWF leads 20 months).Correlation between FWF in the North Pacific and SSS in Area A shows that there is a large range of positive correlation area, which is mainly located in the extension area of Kuroshio (east of Area A), and the high value area of positive correlation moves eastward with the shortening of FWF lead time.Corresponding to the interdecadal variation of temperature in the North Pacific, SSS also has significant interdecadal variation, and the variation of SSS in key areas of the North Pacific can characterize the North Pacific climate variability, which can be used as an alternative index of the North Pacific climate variability. |
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| Keywords: | sea surface salinity variation fresh water flux North Pacific |
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