Interannual Variations in the Summer Coastal Upwelling in the Northeastern South China Sea

Wuyang Chen; Yifeng Tong; Wei Li; Yang Ding; Junmin Li; Wenhua Wang; Ping Shi

doi:10.3390/rs16071282

Remote Sensing (Apr 2024)

Interannual Variations in the Summer Coastal Upwelling in the Northeastern South China Sea

Wuyang Chen,
Yifeng Tong,
Wei Li,
Yang Ding,
Junmin Li,
Wenhua Wang,
Ping Shi

Affiliations

Wuyang Chen: State Key Laboratory of Tropical Oceanography, Guangdong Provincial Observation and Research Station for Marine Ecosystem in the Typical Upwelling Area, Key Laboratory of Science and Technology on Operational Oceanography, Guangdong Key Laboratory of Ocean Remote Sensing, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 511458, China
Yifeng Tong: State Key Laboratory of Tropical Oceanography, Guangdong Provincial Observation and Research Station for Marine Ecosystem in the Typical Upwelling Area, Key Laboratory of Science and Technology on Operational Oceanography, Guangdong Key Laboratory of Ocean Remote Sensing, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 511458, China
Wei Li: State Key Laboratory of Tropical Oceanography, Guangdong Provincial Observation and Research Station for Marine Ecosystem in the Typical Upwelling Area, Key Laboratory of Science and Technology on Operational Oceanography, Guangdong Key Laboratory of Ocean Remote Sensing, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 511458, China
Yang Ding: Key Laboratory of Physical Oceanography, MOE, Ocean University of China, Qingdao 266100, China
Junmin Li: State Key Laboratory of Tropical Oceanography, Guangdong Provincial Observation and Research Station for Marine Ecosystem in the Typical Upwelling Area, Key Laboratory of Science and Technology on Operational Oceanography, Guangdong Key Laboratory of Ocean Remote Sensing, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 511458, China
Wenhua Wang: School of Electronics and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, China
Ping Shi: State Key Laboratory of Tropical Oceanography, Guangdong Provincial Observation and Research Station for Marine Ecosystem in the Typical Upwelling Area, Key Laboratory of Science and Technology on Operational Oceanography, Guangdong Key Laboratory of Ocean Remote Sensing, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 511458, China

DOI: https://doi.org/10.3390/rs16071282
Journal volume & issue: Vol. 16, no. 7
p. 1282

Abstract

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This study scrutinizes interannual (2003–2023) variations in coastal upwelling along the Guangdong Province during summers (June–August) in the northeastern South China Sea (NESCS) by comprehensively applying the moderate-resolution imaging spectroradiometer (MODIS) remote sensing sea surface temperature (SST) and chlorophyll concentration (CHL) data and the model reanalysis product. The results show that SST and upwelling intensity in the sea area have significant (p < 0.05) rising trends in the last 21 years. The CHL shows an upward but insignificant trend, which is affected simultaneously by the rise in SST and the enhancement of upwelling. Further analysis reveals that the interannual variations in upwelling are robustly related to the wind fields’ variations in the coastal region. A clockwise/counter-clockwise anomaly in the wind field centered on the NESCS facilitates alongshore/onshore winds near the Guangdong coast, which can strengthen/weaken coastal upwelling. Based on the correlation between wind field variations and large-scale climate factors, long-term variations in the upwelling intensity can be primarily predicted by the Oceanic Niño Index.

Published in Remote Sensing

ISSN: 2072-4292 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science
Website: http://www.mdpi.com/journal/remotesensing/

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