Application of the Navigational Air-Sea Methane Exchange Flux Observation System in the Qiongdongnan Basin of the Northern South China Sea

Chao Zhong (), Jing’an Lu, Dongju Kang and Qianyong Liang
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Chao Zhong: Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 511458, China
Jing’an Lu: Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 511458, China
Dongju Kang: Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 511458, China
Qianyong Liang: Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 511458, China

Energies, 2023, vol. 16, issue 1, 1-11

Abstract: The sources and sinks of dissolved CH 4 in offshore waters are becoming diversified with the rapid increase in human activities. The concentration and air–sea exchange flux of dissolved CH 4 present new characteristics of more intense spatiotemporal evolution, and the contribution to atmospheric CH 4 continues to increase. Herein, a new model based on navigable air–sea exchange flux observations was proposed, which replaced the traditional station-based sampling analysis and testing method, realizing the synchronous measurement of methane in the atmosphere and surface seawater carried by ships. Based on the Marine Geological Survey project of the China Geological Survey, comprehensive environmental surveys were conducted in April 2018, September 2018, and June 2019 in the Qiongdongnan area in the northern part of the South China Sea, and the dissolved methane content in the sea surface atmosphere and surface seawaters in 2019 were simultaneously obtained. The methane exchange flux ranges of the southeastern sea area were calculated as −0.001~−0.0023 μmol·m −2 ·d −1 and −0.00164~−0.00395 μmol·m −2 ·d −1 by using the Liss and Merlivat formula (LM86), the Wanninkhof formula (W92), and the field-measured wind speed. The feasibility of the navigational air–sea methane exchange flux observation system was proven in a sea trial, and the measurement accuracy and observation efficiency of air-sea flux were improved with the designed system, providing a new technical means for further research on multiscale air–sea interactions and global climate change.

Keywords: navigation measurement; dissolved CH 4 concentration; air-sea exchange flux; South China Sea (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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