基于航次观测和再分析资料的南海海表二氧化碳分压反演及变化机制分析*

doi:10.11978/2021030

Abstract

Abstract:

The partial pressure of carbon dioxide (pCO₂) refers to the content of CO₂ gas at the sea surface when the CO₂ exchange between the sea surface and atmosphere is in dynamic equilibrium, which is an important factor to calculate air-sea CO₂ flux. Based on the observations of pCO₂ covering most of the South China Sea (SCS) from 2008 to 2014, combined with in-situ observations of sea-surface temperature (SST), sea-surface salinity (SSS) and Modis-Aqua satellite observations of chlorophyll a (Chla), we construct a regional inversion of sea-surface pCO₂based on a multi-linear regression method. The root mean square error is estimated to be 5.3 μatm in the area with depth shallower than 30 m, and 10.8 μatm in the remaining sea area, which are consistent with previous results based on cruise observations. Using the equation acquired from our method and combining with the HYbrid Coordinate Ocean Model (HYCOM) reanalysis SST and SSS data and MODIS-Aqua remote sensing Chla data, we obtained monthly sea-surface pCO₂of the SCS from 2004 to 2016 with spatial resolution of 5'×5'. The data can well reflect the seasonal variation of sea-surface pCO₂in the SCS under the influence of SST, which is high in spring and summer, and low in autumn and winter. These findings are similar to previous results based on cruise observations, indicating our method has rather high reliability. Further analysis shows the average sea-surface pCO₂of the SCS and adjacent sea areas has a significant quasi-decadal oscillation: a minimum value appeared around 2011, which first showed a decreasing trend and then an increasing trend. Due to the influence of sea-surface pCO₂, the average air-sea CO₂ flux in the SCS and adjacent areas decreased significantly before 2012, and changed into negative values during winter, then changed slowly since 2012. The variation of SSS in the SCS caused by the Pacific Decadal Oscillation is the main reason for the quasi-decadal oscillation of sea-surface pCO₂and air-sea CO₂ fluxes. Our results indicate the variation of sea-surface pCO₂ in the northern SCS is the most significant, which plays an important role in the seasonal and quasi-decadal oscillation of pCO₂ in the whole area.

Key words: South China Sea, sea-surface pCO₂ inversion, air-sea CO₂ flux, sea-surface salinity, quasi-decadal oscillation

CLC Number:

P732.6

QIU Shuang, YE Haijun, ZHANG Yuhong, TANG Shilin. Multi-linear regression of partial pressure of sea-surface carbon dioxide in the South China Sea and its mechanism[J].Journal of Tropical Oceanography, 2022, 41(1): 106-116.

Figures/Tables 8

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Tab. 1

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图a

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年份	仪器	月份	原始数据量/组
2008	PMEL	9、10、12	1634
2009	PMEL	1	223
2010	GO-8050	9	5187
2011	GO-8050	4、5	6445
2012	GO-8050	10	2519
2013	GO-8050	3、5	3246
2014	GO-8050	4、5	8952
合计	/	/	28206

Multi-linear regression of partial pressure of sea-surface carbon dioxide in the South China Sea and its mechanism

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