南海中部和北部上层海水中溶存甲烷浓度及海气交换通量*

doi:10.11978/j.issn.1009-5470.2013.02.011

Abstract

Abstract:

Dissolved methane concentration, saturation and the sea-to-air transfer flux of dissolved methane in the upper seawater of the central and northern South China Sea (SCS) were analyzed using data from a comprehensive multidisciplinary voyage to this sea from April to May 2010. Dissolved methane from seawater was determined by gas chromatography (GC) through vacuum pumping. The methane concentrations of the surface seawater in the central and northern SCS varied from 1.15 to 5.6 nmol·L^-1, with an average value of 2.2 nmol·L^-1. The methane saturation varied from 59.7% to 298.8%, with oversaturated methane found at 59% of the sites. The sea-to-air transfer flux of methane varied from -17.7 to 61.3 µmol·m^-2·d^-1 (calculated by the LM-86 equation) and from -27.9 to 119.6 µmol·m^-2·d^-1 (calculated by the W-92 equation). The SCS is one of the sources of atmospheric methane with an estimated value of annual methane radiant quantity from 2.7×10^-2 to 4.0×10^-2 Tg·a^-1.

Key words: dissolved methane concentration, sea-to-air flux, central and northern South China Sea

CLC Number:

P734

MA Li-jie, CUI Ying-chun. Dissolved methane concentration and sea-to-air transfer flux of dissolved methane in the upper seawater of the central and northern South China Sea[J].Journal of Tropical Oceanography, 2013, 32(2): 94-101.

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Dissolved methane concentration and sea-to-air transfer flux of dissolved methane in the upper seawater of the central and northern South China Sea

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