Journal
REMOTE SENSING
Volume 14, Issue 15, Pages -Publisher
MDPI
DOI: 10.3390/rs14153574
Keywords
Changjiang diluted water; sea surface salinity estimation; ocean front; long-term ocean color; OC-CCI
Categories
Funding
- Korea Institute of Marine Science & Technology Promotion (KIMST) - Ministry of Oceans and Fisheries [20220546]
- Ministry of Ocean and Fisheries, Korea
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Long-term sea surface salinity in the East China Sea was estimated using machine learning based on OC-CCI data. The study revealed the distribution of Changjiang diluted water fronts and their correlation with chlorophyll-a concentration, sea surface density, and nitrogen concentration. The influence of Changjiang diluted water on sea level anomaly was also detected. This research provides valuable insights on the impact of Changjiang diluted water on the East China Sea marine environment.
Long-term sea surface salinity (SSS) in the East China Sea (ECS) was estimated based on Ocean Color Climate Change Initiative (OC-CCI) data using machine learning during the summer season (June to September) from 1997 to 2021. Changjiang diluted water (CDW) in the ECS propagates northeastward and forms longitudinally-oriented ocean fronts. To determine the CDW's distribution, three fronts were investigated: (1) a CDW front based on chlorophyll-a concentration (Chl), SSS, and sea surface temperature (SST); (2) a CDW front based on sea surface density (SSD); and (3) a CDW front for nutrient distribution. The Chl fronts matched well with the SSS fronts, suggesting that Chl variation in the ECS is highly correlated with the CDW. Furthermore, the SSD fronts spatially matched well with nitrogen concentration. Sea level anomaly (SLA) variation with SSD was also detected, indicating that CDW had sufficiently large effects on SLA so that they may be detectable by altimeter measurements. This result suggests that the influence of steric height changes and the inflow from rivers are significant in the ECS. Additionally, the continuous long-term SSD developed in this study enables researchers to detect the CDW front and its influence on the ECS marine environment.
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