Satellite views of the seasonal and interannual variations of the particulate organic carbon in the northern South China Sea

Cui Wansong; Pan Delu; Bai Yan; He Xianqiang; Zhu Qiankun; Hu Zifeng; Li Teng; Gong Fang; Zhang Lin

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Article Navigation > Haiyang Xuebao > 2017 > 39(3): 122-134

Cui Wansong, Pan Delu, Bai Yan, He Xianqiang, Zhu Qiankun, Hu Zifeng, Li Teng, Gong Fang, Zhang Lin. Satellite views of the seasonal and interannual variations of the particulate organic carbon in the northern South China Sea[J]. Haiyang Xuebao, 2017, 39(3): 122-134.

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Satellite views of the seasonal and interannual variations of the particulate organic carbon in the northern South China Sea

State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2016-03-10

Abstract

Abstract

The particulate organic carbon (POC) plays an important role in the marine carbon cycle. It transports the organic carbon from the surface layer to the deep sea, and consequently removes the carbon dioxide (CO₂) from the air, thus it is an important component of biological pump. To study the temporal and spatial distribution and long-term variation of sea surface POC concentration in the northern South China Sea (nSCS), we used the in situ data of four cruises from June 2009 to May 2011 to validate and calibrate MODIS/AQUA satellite monthly average POC products. The results shown the satellite-derived POC and in situ data had a good linear relationship in the nSCS (R²=0.72), but with a systematic bias. With the validated satellite POC products, we found that POC concentration in the shelf of the bias was high (33.34±8.02) mg/m³; the POC values of the southwest area of Luzon Strait was low (29.25±6.20) mg/m³, and POC had lowest values in the northern basin of SCS (27.02±4.84) mg/m³. The POC concentration was lower in spring and summer than that in winter and autumn; the lowest values generally appeared in May, and it remained a relative low and stable value from June to August, then the POC concentration began to rise in September, and reached the highest value in December. We analyzed the controlling factors on the POC distribution in the nSCS using the satellite-derived chlorophyll a (Chl a) concentration, sea surface temperature (SST), the model-derived mixed layer depth (MLD), as well as the in situ Chl a and total suspended matter concentration (TSM). The results demonstrated that the POC and Chl a in the autumn and winter had a relatively good correlation (R²=0.51), but it was dispersed in the spring and summer, indicating that Chl a had significant influence on POC variation in the nSCS in autumn and winter. The POC, Chl a, MLD and SST had the significant inter-annual variability, but had no significant increase or decrease trend in the period of 2003-2014. The mechanism of controlling POC spatial and temporal variation was complex.
- the northern South China Sea,
- particulate organic carbon,
- biological effect,
- remote-sensing inversion,
- time series variation

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