阿拉伯海中东部沿海盐度锋的形成机制和生物地球化学响应

IF 1.9 4区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Dynamics of Atmospheres and Oceans Pub Date : 2024-09-17 DOI:10.1016/j.dynatmoce.2024.101498

Vishnu Narayanan Nampoothiri S , Sudheesh V , Kausar Fatima Bepari, B. Bikram Reddy, Naseera K, Rasheed K, Anil Kumar Vijayan, Gupta G.V.M

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引用次数: 0

摘要

本研究调查了 2018 年 8 月夏季季风高峰期间在阿拉伯海（EAS）中东部沿海，特别是在芒格洛尔（北纬 13 度）附近观测到的沿海盐度锋的形成机制和影响。季风强降雨、河流径流和沿岸上升流相互作用，在东阿拉伯海中部形成了一个具有独特物理和生物地球化学特性的动态锋区。研究发现，观测到的盐度锋区是由于强上升流打破淡水透镜体，随后通过盛行流和埃克曼输送将低盐度羽流向近海输送而形成的。与非锋面站相比，高营养浓度使锋面区的叶绿素 a 浓度增加了 15-20 倍（10.12 毫克/立方米）。硅藻在锋面区占优势，表明在沿岸食物网中有食草动物的控制。塑料碎片和泡沫状微粒在锋面区的积聚对生态造成危害，并威胁到水生生物。

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Formation mechanisms and biogeochemical response of coastal salinity front in the central eastern Arabian Sea

This study investigates the formation mechanisms and impact of a coastal salinity front observed in the central eastern Arabian Sea (EAS) coast, particularly off Mangalore (∼13°N), during the peak summer monsoon in August 2018. The interplay of intense monsoon rainfall, river runoff and coastal upwelling created a dynamic frontal zone characterised by distinct physical and biogeochemical properties in the central EAS. The study revealed that observed salinity fronts are formed due to the breaking of freshwater lenses by strong upwelled waters and the subsequent offshore transport of low-salinity plumes by prevailing current and Ekman transport. The high nutrient concentrations enhanced the chlorophyll a concentration 15–20 times higher (10.12 mg/m³) in the frontal zone compared to the non-frontal station. The dominance of diatoms in the frontal zone indicates herbivorous control in the coastal food web. Accumulation of plastic debris and foam-like particles in the frontal zone poses ecological risks and threatens aquatic life.

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来源期刊

Dynamics of Atmospheres and Oceans 地学-地球化学与地球物理

CiteScore

3.10

自引率

5.90%

发文量

审稿时长

>12 weeks

期刊介绍： Dynamics of Atmospheres and Oceans is an international journal for research related to the dynamical and physical processes governing atmospheres, oceans and climate. Authors are invited to submit articles, short contributions or scholarly reviews in the following areas: •Dynamic meteorology •Physical oceanography •Geophysical fluid dynamics •Climate variability and climate change •Atmosphere-ocean-biosphere-cryosphere interactions •Prediction and predictability •Scale interactions Papers of theoretical, computational, experimental and observational investigations are invited, particularly those that explore the fundamental nature - or bring together the interdisciplinary and multidisciplinary aspects - of dynamical and physical processes at all scales. Papers that explore air-sea interactions and the coupling between atmospheres, oceans, and other components of the climate system are particularly welcome.