南海西部秋季海表pCO2分布与海-气CO2通量*

doi:10.11978/2015035

Abstract

Abstract: Distribution of p_CO2 in the surface water of the western South China Sea (SCS) was examined using data for autumn 2012. In this study, the control factors of surface p_CO2 were investigated and sea-air CO₂ flux in the study area was estimated. The results showed that sea surface p_CO2 values of 37.8 to 57.1 Pa were observed in the western SCS. The sea surface p_CO2 was always higher than that in the atmosphere, which indicated the western SCS acted as a source of the atmosphere CO₂ in autumn. In the study area, sea surface p_CO2 was mainly controlled by carbonate thermodynamics, and sea surface temperature (SST) was the predominant factor that controlled p_CO2distribution. However, sea surface p_CO2 was also influenced by other factors in some areas. The transport of Mekong River diluted water led to low surface salinity water located in the Vietnamese eastern offshore region. Water mixing between Mekong River diluted water with high p_CO2 and offshore water affected the regional surface p_CO2 distribution directly. Furthermore, calcification process of coral reef organisms caused extremely high sea surface p_CO2 to exist in the western Swallow Reef of the Nansha Islands. The CO₂ outgassing rate of the western SCS in autumn was mainly influenced by sea surface wind speed, with average CO₂ outgassing rate of 2.9 mmolC·m^-2·d^-1 in the northern continental shelf and northern basin and of 0.9 mmolC·m^-2·d^-1 in the central and southern basins. The effect of metabolism of coral reefs in regional areas should not be neglected in CO₂ flux estimation.

Key words: the Western South China Sea, partial pressure of carbon dioxide, sea-air CO2 flux

CLC Number:

P734.45

XU Xin, YU Peisong, CAI Xiaoxia, PAN Jianming, HU Ji, ZHANG Haifeng. Distributions of partial pressure of carbon dioxide and sea-air CO₂ flux in the western South China Sea in autumn^*[J].Journal of Tropical Oceanography, 2016, 35(3): 55-64.

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Distributions of partial pressure of carbon dioxide and sea-air CO₂ flux in the western South China Sea in autumn^*

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Distributions of partial pressure of carbon dioxide and sea-air CO2 flux in the western South China Sea in autumn*

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Distributions of partial pressure of carbon dioxide and sea-air CO₂ flux in the western South China Sea in autumn^*