孟加拉湾北部海面盐度季节内变化的特征和机制

IF 4 3区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Rong Cui, Xuhua Cheng, Wei Duan, Long Jiang, Yifei Zhou
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引用次数: 0

摘要

由于降雨和河流排放带来的大量淡水输入,孟加拉湾北部海面盐度(SSS)偏低,季内变率(ISV)较大。本研究基于卫星观测数据和简单海洋数据同化(SODA)输出结果,研究了孟加拉湾北部海表盐度 ISV 的特征和动态机制。强烈的 SSS ISV 主要集中在恒河-布拉马普特拉河河口附近和印度东海岸,那里的水平盐度梯度变化很大。波罗的海北部的 SSS ISV 与淡水输送明显同步,淡水输送在 7 月至 11 月达到高峰。河流淡水在地理和时间上的贡献都很大。SSS 预算分析表明,水平平流在 SSS ISV 中起主导作用。一旦洋流穿过盐度场,巨大的水平平流异常就变得非常重要,并有利于 SSS ISV。SSS 模式的改变会影响水体密度,从而可能影响洋流的强度和方向。这反过来又会对当地和区域气候模式产生连带影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Features and mechanisms of sea surface salinity intraseasonal variability in the Northern Bay of Bengal
In response to abundant freshwater input from rainfall and river discharge, the northern Bay of Bengal (BoB) is featured by low sea surface salinity (SSS) and strong intraseasonal variability (ISV). This study investigates the characteristic and dynamic mechanisms of SSS ISV in the northern BoB based on satellite observations and the output of Simple Ocean Data Assimilation (SODA). The strong SSS ISV is mainly concentrated near the mouth of the Ganges–Brahmaputra River and along the east coast of India, where the horizontal salinity gradient varies greatly. SSS ISV in the northern BoB is notably in phase with freshwater transport, which peaks from July to November. The contribution of riverine freshwater is significant both geographically and temporally. The SSS budget analysis indicates that the horizontal advection plays a dominant role in SSS ISV. Once currents cross the salinity field, large horizontal advection anomalies become important and favor SSS ISV. Altered SSS patterns can impact water density, potentially influencing the strength and direction of currents. This, in turn, may have cascading effects on local and regional climate patterns.
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来源期刊
Geoscience Letters
Geoscience Letters Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
4.90
自引率
2.50%
发文量
42
审稿时长
25 weeks
期刊介绍: Geoscience Letters is the official journal of the Asia Oceania Geosciences Society, and a fully open access journal published under the SpringerOpen brand. The journal publishes original, innovative and timely research letter articles and concise reviews on studies of the Earth and its environment, the planetary and space sciences. Contributions reflect the eight scientific sections of the AOGS: Atmospheric Sciences, Biogeosciences, Hydrological Sciences, Interdisciplinary Geosciences, Ocean Sciences, Planetary Sciences, Solar and Terrestrial Sciences, and Solid Earth Sciences. Geoscience Letters focuses on cutting-edge fundamental and applied research in the broad field of the geosciences, including the applications of geoscience research to societal problems. This journal is Open Access, providing rapid electronic publication of high-quality, peer-reviewed scientific contributions.
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