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Journal of Tropical Oceanography >

2016 , Vol. 35 >Issue 3: 1 - 10

DOI: https://doi.org/10.11978/2015051

Marine Hydrography

Using MODIS to track and monitor the impact of a cold eddy on the bio-optical parameters of surface waters*

  • HU Shuibo ,
  • CAO Wenxi ,
  • WANG Guifen ,
  • XU Zhantang
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  • 1. State Key Laboratory of Tropics Oceanography (South China Sea Institute of Oceanology, Chinese Academy of Sciences), Guangzhou 510301, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;

Received date: 2015-04-14

  Online published: 2016-05-27

Supported by

National Natural Science Foundation of China grants (41376042, 41176035); Science and Technology Plan Project of Shen Zhen (JSGG20130923093840265); Natural Science for Youth Foundation (41206029); Youth Foundation supported by South China Sea Institute of Oceanology Chinese academy of sciences (SQ201102); Strategic Priority Research Program of the Chinese Academy of Sciences (XDA11040302)

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Abstract

Understanding biogeochemical processes associated with oceanic eddies is important, and ocean-color remote sensing has been used as a tool to provide large-scale data for such studies. Based on the latest regional bio-optical inversion algorithm in the South China Sea, we used Moderate Resolution Imaging Spectroradiometer (MODIS) to track and monitor a cold eddy originated in the late winter around the Luzon Strait. In the early stage, the eddy carrying high nutritional and high biomass seawater moved toward northwest. Then, the eddy stayed in an area for a month. During this period, with the continuous suction of the eddy, the concentration of chlorophyll-a (Chl-a) increased from 0.26 to 0.33 mg•m-3 in the eddy area and decreased from 0.24 to 0.15 mg•m-3 outside the eddy. The concentration of particulate organic carbon (POC), phytoplankton absorption coefficient (aph(443)), diffuse attenuation coefficient (Kd(490)) and colored dissolved organic matter (CDOM) showed the same variation trend with Chl-a, while the POC∶Chl-a ratio and fraction of picoplankton (Fp) exhibited opposite trends. When the eddy moved westward, Chl-a, POC, aph(443) and Kd(490) decreased slowly because of the weakening of eddy intensity and nutrient supply. Our results demonstrated that the special bio-optical response induced by eddy pumping and advection can be an additional tool to track and study oceanic eddies.

Key words： mesoscale eddy; ocean-color remote sensing; bio-optical algorithm; the South China Sea

Cite this article

HU Shuibo , CAO Wenxi , WANG Guifen , XU Zhantang . Using MODIS to track and monitor the impact of a cold eddy on the bio-optical parameters of surface waters*[J]. Journal of Tropical Oceanography, 2016 , 35(3) : 1 -10 . DOI: 10.11978/2015051

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