Dr. Zhonghan Chen Profile

Dr. Zhonghan Chen

at South China Institute of Environmental Sciences

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Proceedings Article | 20 September 2020 Paper

Study of island mass effect in the Xisha Archipelago based on the MODIS satellite data

Zhuangming Zhao, Wenjing Zhao, Zhonghan Chen, Jing Yang

Proceedings Volume 11529, 115290J (2020) https://doi.org/10.1117/12.2572830

KEYWORDS: MODIS, Satellites

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Island mass effect, which is accompanied by higher bio-productivity and closely associated with fishing activities, was observed in many island (reefs) areas. Recently, we found the Chl-a enrichment (the annual mean≥0.14 mg/m³) in the surrounding of the reefs and atolls in the Xisha Archipelago, based on the daily MODISA Level-2 data during the years of 2003 to 2017. The DINEOF algorithm was used to filling missing values in the MODISA data. The analysis results show that: 1) Generally, the Chl-a concentrations became larger in winter (November to January) and smaller in summer (May to July) in the XA; The seasonal variation of Chl-a is strongly related to the Mixed Layer Depth, which is larger in winter and smaller in summer. 2) In the XA, higher Chl-a were observed in the lagoons of the atolls, where is shallow and nutritious. Hovmoller diagrams of daily MODIS Chl-a along the transect of several atolls show that higher Chl-a also appeared in the downstream side. It seems that the lagoons are the sources of the Chl-a, and the turbulent currents transfer and maintain the higher Chl-a in the downstream wakes.

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