海洋化学

海南东部沿岸河流和潟湖中溶存甲烷的分布及通量 *

  • 韩玉 ,
  • 张桂玲 ,
  • 赵玉川
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  • 中国海洋大学海洋化学理论与工程技术教育部重点实验室 , 山东 青岛 266100
韩玉 (1987—), 女 , 山东省济宁市人 , 硕士研究生 , 主要研究方向为海洋环境科学。

收稿日期: 2010-11-30

  修回日期: 2011-02-26

  网络出版日期: 2012-06-05

基金资助

科技部国际合作项目 (2007DFB20380); 教育部新世纪优秀人才支持计划项目 (NCET-08-0507)

Distribution and fluxes of methane in tropical rivers and lagoons of eastern Hainan

  • Han-Yu ,
  • Zhang-Gui-Ling ,
  • Diao-Yu-Chuan
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  • Key Laboratory of Marine Chemistry Theory and Technology ,Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

Received date: 2010-11-30

  Revised date: 2011-02-26

  Online published: 2012-06-05

摘要

甲烷 (CH4) 作为大气中重要的温室气体 , 直接或间接地影响全球气候变化。 于 2009 年 3 月 27 日至 4 月 15 日对海南东部河流 ( 文昌河、文教河、万泉河 ) 、潟湖 ( 八门湾、博鳌、小海和老爷海 ) 等进行了调查 , 采集了表层和部分底层水样 , 对溶解 CH4 浓度进行了测定并初步估算了其水 - 气交换通量。结果表明 , 文昌河、文教河受人为活动影响较大 , 表层 CH4 饱和度较高 , 分别为 ( 60664±25118)% 、 (38582±26339)%, 污水输入、红树林输入和现场产生是其 CH4 的主要来源。 万泉河表层 CH4 饱和度为 ( 9472±5594)% , 现场产生是其水体溶存 CH4 的主要源。 八门湾、博鳌、小海和老爷海潟湖表层水体溶存 CH4 均处于过饱和状态 , 但其饱和度远小于入湖河流 , 分别为 ( 2471±2937)% 、 (5692±3435)% 、 (546±251)% 和 (6878±4635)%, 其中河流输入、地下水和红树林间隙水输入、现场产生是潟湖中 CH4 的主要来源 , 水体中 CH4 的氧化和水 - 气交换是 潟湖中 CH4 的主要汇 。初步 估算出 文昌河和万泉河 CH4 的水 - 气交换通量分别为 5967.0 ±5142.1 和 496.2 ±335.9 μmol·m - 2 ·d - 1 , 八门湾、博鳌、小海和老爷海潟湖的 水 - 气交换通量 分别为 528.7±625.0 、 441.7±473.3 、 26.6±21.6 和 1287.8±1453.3 μmol·m - 2 ·d - 1 。 海南东部河流、潟湖是近岸水体及大气 CH4 的净源。

本文引用格式

韩玉 , 张桂玲 , 赵玉川 . 海南东部沿岸河流和潟湖中溶存甲烷的分布及通量 * [J]. 热带海洋学报, 2012 , 31(2) : 87 -95 . DOI: 10.11978/j.issn.1009-5470.2012.02.012

Abstract

Methane (CH4) is an important greenhouse gas, which can influence the Earth's climate change both directly and indirectly. Distributions and fluxes of CH4 in rivers and lagoons of eastern Hainan were obtained during the survey from March 27th to April 15th in 2009. Surface waters of the three rivers (Wenchang, Wenjiao and Wanquan rivers) were over-saturated in CH4 with respect to atmospheric equilibrium [( 60664±25118)%, (38582±26339)% and (9472±5594)%, respectively ]. Surface waters of the lagoons were also over-saturated in CH4, but at much lower levels than those in the rivers. The dissolved CH4 in the lagoons mainly come from riverine input, inputs from groundwater and fringing mangrove forest, and in-situ production; the main sinks of methane in the lagoons were oxidation and outgassing. The estimated air–water CH4 fl uxes using the RC01 formula of Wenchang and Wanquan rivers were 5967.0 ±5142.1 and 496.2 ±335.9 μmol·m - 2 ·d - 1 , respectively. Air–water CH4 fl uxes of the logoons were 528.7±625.0 , 441.7±473.3 , 26.6±21.6, and 1287.8±1453.3 μmol·m - 2 ·d - 1 for Bamen bay, Bo’ao , Xiaohai, and Laoyehai, respectively. Estuaries and lagoons in eastern Hainan are persistently supersaturated in CH4, which indicates that they are net sources of atmospheric CH4.

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