Methane in the Yellow Sea and East China Sea: dynamics, distribution, and production -- Journal of Oceanology and Limnology,2022,40(2):530-550

	Cite this paper:
	Wangwang YE, Guanxiang DU, Honghai ZHANG, Guiling ZHANG. Methane in the Yellow Sea and East China Sea: dynamics, distribution, and production[J]. Journal of Oceanology and Limnology, 2022, 40(2): 530-550

Methane in the Yellow Sea and East China Sea: dynamics, distribution, and production

Wangwang YE^1,2,3, Guanxiang DU^1,3, Honghai ZHANG^1,3, Guiling ZHANG^1,3

1 Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China;
2 Key Laboratory of Global Change and Marine-Atmospheric Chemistry, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China;
3 Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China

Abstract:

The Yellow Sea (YS) and East China Sea (ECS) are important marginal seas of the western Pacific. Understanding the dynamics of methane (CH₄) in the YS and ECS are essential to evaluate the role of coastal seas in global warming. We measured dissolved CH₄ at various depths in the water column of the YS and ECS during a cruise from March to April 2017. The concentrations of CH₄ varied greatly in different water masses, suggesting that the hydrographic conditions can substantially affect the CH₄ distribution. The CH₄ budget in the shelf of the ECS, which was estimated with a box model, suggests CH₄ consumption in the water column was the major sink (>95%), followed by a loss with a total of 2.2% CH₄ released to the atmosphere. Overall a local CH₄ production of 0.28 nmol/(L·d) was needed to maintain the CH₄ excess. Results from laboratory incubations showed an increase in CH₄ (1.5 times higher than the value of the control) after the addition of dimethylsulfoniopropionate (DMSP). Field incubations result in a CH₄ production rate of 1.2 nmol/(L·d) under a N-stressed conditions (N:P<1), indicates that the DMSPdependent CH₄ production prefer to occur in the oligotrophic seawaters, where nitrogen is depleted. This study demonstrates that the marginal seas of China is a hotspot for CH₄ dynamics, and the cycling of methylated sulfur compounds (such as DMSP) may contribute importantly to locally formed CH₄. This may have further implication to carbon and sulfur biogeochemical cycles in the western Pacific.

Received: 2021-01-07 Revised:

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