Distribution of dissolved methane concentration and its flux in early autumn in the Yangtze Estuary-Hangzhou Bay

Marine Environmental Science 2026 Open access

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Authors: Xiaolong SHEN, Nan ZHENG, Bin Wang, Jingyu CAI, Jun WEN, Fengmei Pan, Dongxia ZHAO, Zengyi YANG, Kangxuan Wei, Bingjiang CHEN, Kunpeng Zang
DOI: 10.3724/j.mes.2024-x-0331
Cited by: 0
References: 20

Abstract

基于2022年9月长江口−杭州湾海洋污染基线试点调查航次，本文开展了溶解甲烷浓度和海−气交换通量及主要调控因子的观测研究。结果显示，观测海域表层海水中溶解甲烷浓度范围为（6.89～43.41）nmol/L，平均值为（18.58 ± 8.88）nmol/L，底层海水中溶解甲烷浓度范围为（8.88～36.15）nmol/L，平均值为（8.25 ± 89.34）nmol/L。溶解甲烷浓度总体呈长江口和杭州湾内较高、离岸外海较低的分布特征，显示陆源河流输入和沉积物释放是观测海域溶解甲烷的主要来源。观测海域表层海水中溶解甲烷平均饱和度达（275.10 ± 6.70）%，海−气甲烷交换通量平均值为（157.40 ± 145.68）μmol/(m2·d)，是大气甲烷的源。初步估算该海域甲烷年释放量约为1.78 ×109 mol，约占全球海洋年释放量的0.16%，可直接导致观测海域海表大气甲烷摩尔分数抬升约3.2 nmol/mol。

Fields of Study & Subjects

Methane Hydrates and Related Phenomena Atmospheric and Environmental Gas Dynamics Marine and coastal ecosystems

Publication details

Journal / source
Marine Environmental Science
Publication date
1 January 2026
Language
EN