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Marine pollution, ecotoxicology and sustainability
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Spatial and temporal changes in chlorophyll-a concentrations in the Bohai Sea in the past two decades
P-E1-11
Tian Hongzhen* , Tianjin Polytechnic University
Liu Qinping, Tianjin Polytechnic University
Joaquim I. Goes, Columbia University
Helga do Rosario Gomes, Columbia University
Yang Mengmeng, Nagoya University
Presenter Email: broadsky2008@gmail.com |
| Chlorophyll-a (chl-a) concentration is an important index of phytoplankton biomass which plays a fundamental role in marine ecosystems. Chl-a derived from both the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) from 1997 to 2010 and the MODerate resolution Imaging Spectroradiometer (MODIS) sensor on satellite Aqua from 2002 to 2018 were combined into one time series to investigate the spatial and temporal variability of chl-a concentrations in the Bohai Sea. Sea surface temperature (SST), wind speed and precipitation were also analyzed. Annual chl-a concentrations increased 14.1% in the study area over the past two decades. Chl-a concentrations in every season and in all months except for November have increased. Chl-a concentrations increased mainly in the middle part of the sea from the coastal area near the estuary of Luan River to the Bohai Strait. Increases in precipitation over the land around the Bohai Sea through summer to winter, and wind speed in summer and autumn, as well as decreases in SST in autumn, all contributed to the rises of chl-a concentrations. |
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