海南东部沿岸河流和潟湖中溶存甲烷的分布及通量  *

doi:10.11978/j.issn.1009-5470.2012.02.012

Abstract

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, whichindicates that they are net sources of atmospheric CH₄.

Key words: methane, distribution, water-to-air flux, river, lagoon

CLC Number:

P734.4

HAN Yu,ZHANG Gui-ling,ZHAO Yu-chuan. Distribution and fluxes of methane in tropical rivers and lagoons of eastern Hainan[J].Journal of Tropical Oceanography, 2012, 31(2): 87-95.

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

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