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

热带海洋学报 ›› 2013, Vol. 32 ›› Issue (2): 94-101.doi: 10.11978/j.issn.1009-5470.2013.02.011cstr: 32234.14.j.issn.1009-5470.2013.02.011

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^*

马立杰¹，崔迎春²

1. 中国科学院海洋研究所，中国科学院海洋地质与环境重点实验室，山东青岛 266071； 2. 国家海洋局第一海洋研究所，海洋沉积与环境地质国家海洋局重点实验室，山东青岛 266061

收稿日期:2011-11-02 修回日期:2013-06-10 出版日期:2013-06-10 发布日期:2013-06-10
作者简介:作者简介: 马立杰(1976—), 女，黑龙江省佳木斯市人，副研究员，博士，从事海洋地质与环境方面的研究。 E-mail: malijie@qdio.ac.cn
基金资助:
基金项目：国家自然科学基金项目(40706024)

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

MA Li-jie¹, CUI Ying-chun²

1. Key Laboratory of Marine Geology, Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; 2. Key Laboratory of Marine Sedimentology, Environmental Geology of State Oceanic Administration, First Institute of Oceanography, State Oceanic Administration People’s Republic of China, Qingdao 266061, China

Received:2011-11-02 Revised:2013-06-10 Online:2013-06-10 Published:2013-06-10

摘要/Abstract

摘要：

根据2010年4—5月国家基金委南海多学科综合航次在南海中部和北部的调查资料，利用抽真空气相色谱法测定海水中溶存甲烷浓度，分析了该海区上层海水中溶存甲烷的浓度、饱和度及海气交换通量。南海中部和北部表层海水中溶存甲烷浓度范围为1.15—5.6nmol·L^-1，平均值为2.2nmol·L^-1，饱和度范围为59.7%—298.8%，59%站位的溶存甲烷处于过饱和状态。甲烷海气交换通量范围分别为-17.7—61.3µmol·m^-2·d^-1(根据LM-86方程计算)和-27.9—119.6µmol·m^-2·d^-1(根据W-92方程计算)。南海是大气中甲烷的来源之一，年甲烷辐射量估算值为2.7×10^-2—4.0×10^-2Tg·a^-1。

关键词: 溶存甲烷浓度, 海气通量, 南海中部和北部

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

中图分类号:

P734

马立杰，崔迎春. 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^*[J]. 热带海洋学报, 2013, 32(2): 94-101.

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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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^*

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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