热带海洋学报 ›› 2019, Vol. 38 ›› Issue (5): 1-9.doi: 10.11978/2018142

• 海洋水文学 •    下一篇

热带东太平洋淡水池的季节变化 *

池建伟1,2,曲堂栋3,4,张莹1,2,施平1,杜岩1,2()   

  1. 1. 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), 广东 广州 510301
    2. 中国科学院大学, 北京 100049
    3. 区域地球系统科学与工程联合研究所(加州大学洛杉矶分校), 加利福尼亚 洛杉矶 90095
    4. 海洋环境科学与数值模拟实验室(自然资源部, 第一海洋研究所), 山东 青岛 266000;
  • 收稿日期:2018-12-27 修回日期:2019-02-16 出版日期:2019-09-20 发布日期:2019-10-09
  • 通讯作者: 杜岩
  • 作者简介:池建伟(1990—), 男, 福建省三明市人, 博士研究生, 主要从事海洋盐度研究。E-mail: chijianwei@scsio.ac.cn
  • 基金资助:
    中国科学院战略性先导科技专项(XDA19060501);中国科学院战略性先导科技专项(XDA13010404);国家海洋局“全球变化与海气相互作用”专项(GASI-IPOVAI-02);国家自然科学基金(41525019);国家自然科学基金(41506019);国家自然科学基金(41805057);国家自然科学基金(41830538)

Seasonal variability of the Eastern Tropical Pacific Fresh Pool *

Jianwei CHI1,2,Tangdong QU3,4,Ying ZHANY1,2,Ping SHI1,Yan DU1,2()   

  1. 1. State Key Laboratory of Tropical Oceanography (South China Sea Institute of Oceanology, Chinese Academy of Sciences), Guangzhou 510301, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, California 90095, USA
    4. Key Laboratory of Marine Science and Numerical Modeling, First Institute of Oceanography, State Oceanic Administration, Qingdao 266000, China;
  • Received:2018-12-27 Revised:2019-02-16 Online:2019-09-20 Published:2019-10-09
  • Contact: Yan DU
  • Supported by:
    Strategic Priority Research Program of Chinese Academy of Sciences(XDA19060501);Strategic Priority Research Program of Chinese Academy of Sciences(XDA13010404);State Oceanic Administration of China(GASI-IPOVAI-02);Natural Science Foundation of China(41525019);Natural Science Foundation of China(41506019);Natural Science Foundation of China(41805057);Natural Science Foundation of China(41830538)

摘要:

文章利用观测和模式数据, 并基于混合层盐度收支方法, 研究了热带东太平洋淡水池的季节变化。研究发现: 热带东太平洋淡水池具有显著的季节变化, 由海表强迫(蒸发与降水)、水平平流和次表层过程共同控制。淡水池的季节变化主要分为扩张与收缩两个阶段。4月至11月为扩张阶段, 淡水池向西扩张, 最大体积和面积比最小时扩大将近一倍, 分别达到2.83×10 5km 3和8.94×10 6km 2。热带辐合带向北移动带来的强降水是淡水池扩张的主要原因, 海表强迫决定了混合层盐度降低。12月至3月为淡水池收缩阶段, 海表淡水通量的减弱、水平平流和次表层过程的增强导致混合层盐度升高, 淡水池向东收缩。

关键词: 东太平洋淡水池, 季节变化, 混合层盐度收支

Abstract:

Using the observations and a mixed layer salinity budget from an ocean general circulation model, we investigate the seasonal variability of the eastern tropical Pacific freshwater pool (EPFP). The EPFP has significant seasonal variation, which is controlled by the surface forcing (evaporation and precipitation), horizontal advection and subsurface processes. The seasonal changes in EPFP are mainly divided into two phases: expansion and contraction phases. From April to November, the freshwater pool expands to the west and the freshwater volume and area doubles to 2.83×10 5 km 3 and 8.94×10 6 km 2, respectively. The strong precipitation brought by the northward movement of the intertropical convergence zone is the main reason for the expansion of the EPFP: the surface forcing determines the reduction of the mixed layer salinity. From December to March, when the EPFP shrinks, the increasing of the mixed layer salinity is attributed to the weakening of surface freshwater flux and the enhancement of horizontal advection and subsurface processes.

Key words: the eastern tropical Pacific fresh pool, seasonal variability, mixed layer salinity budget

中图分类号: 

  • P732.26