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Contrasting marine carbon monoxide cycles found in the North Pacific and the Amundsen Sea

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Title
Contrasting marine carbon monoxide cycles found in the North Pacific and the Amundsen Sea
Other Titles
Contrasting marine carbon monoxide cycles found in the North Pacific and the Amundsen Sea
Authors
Kwon, Young Shin
Kang, Hyoun-woo
Hahm, Doshik
Park, Keyhong
Rhee, Tae Siek
Keywords
Amundsen SeaNorth Pacificmarine carbon monoxide
Issue Date
2015
Citation
Kwon, Young Shin, et al. 2015. Contrasting marine carbon monoxide cycles found in the North Pacific and the Amundsen Sea. The 21th International Symposium on Polar Sciences: Polar Regions as a Key Laboratory for the Changing Globe and Beyond. Incheon, Korea. 2015.05.19~2015.05.20.
Abstract
Carbon monoxide (CO) plays a primary role in regulating the oxidizing power of the atmosphere. In the upper ocean, CO exhibits a strong diurnal cycle being produced by photolytic decomposition of chromophoric dissolved organic matter (CDOM), consumed by microbes, and outgassed by the gas exchange process. To investigate dominant processes that govern the budget of dissolved CO in the mixed layer, we measured air-sea CO flux and microbial consumption of CO during the two expeditions in the Amundsen Sea and the North Pacific in summer season of 2012. In the North Pacific, the sea-to-air flux density was ~2 μmol/m2/d, slightly larger than that in the Amundsen Sea although the Amundsen Sea was more supersaturated with respect to the CO in the overlying air. Irradiation for the photolytic production was also twice more intense in the North Pacific. Dark incubation experiments conducted onboard revealed that microbial consumption rate of the CO in the mixed layer are quite different. The mean residence time against the microbial consumption in the North Pacific was about 4 hours while 60 hours in the Amundsen Sea. The surface mixed layer depth was far deeper in the Amundsen Sea than in the North Pacific. Our observation indicates that indistinct diurnal variation of dissolved CO in the Amundsen Sea likely to be due to deep mixed layer and slow microbial consumption while the shallow mixed layer and intense microbial consumption of dissolved CO in the North Pacific render diurnal variation to be stronger.
URI
https://repository.kopri.re.kr/handle/201206/7150
Conference Name
The 21th International Symposium on Polar Sciences: Polar Regions as a Key Laboratory for the Changing Globe and Beyond
Conference Place
Incheon, Korea
Conference Date
2015.05.19~2015.05.20
Type
Poster
Indexed
포스터
Appears in Collections  
2011-2013, Impact of the ocean-atmosphere interactions in the polar and low-latitude oceans to the climate change (11-13) / Rhee, Tae Siek (PG11030, PG12030, PE13410, PE12220, PE12410)
2014-2016, Physical and Bio-Geochemical Processes in the Amundsen Sea / Lee; Sang H. (PP15020; PP16020; PP14020)
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