Suppressed CO2 Outgassing by an Enhanced Biological Pump in the Eastern Tropical Pacific
- Authors
- Kim, Hyung Jeek; Kim, Tae-Wook; Hyeong, Kiseong; Yeh, Sang-Wook; Park, Jong-Yeon; Yoo, Chan Min; Hwang, Jeomshik
- Issue Date
- 11월-2019
- Publisher
- AMER GEOPHYSICAL UNION
- Keywords
- sinking particle; biological pump; sediment trap; ENSO; Pacific decadal oscillation; Eastern Tropical Pacific
- Citation
- JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, v.124, no.11, pp.7962 - 7973
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
- Volume
- 124
- Number
- 11
- Start Page
- 7962
- End Page
- 7973
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/62065
- DOI
- 10.1029/2019JC015287
- ISSN
- 2169-9275
- Abstract
- The Eastern Tropical Pacific (ETP) is the largest oceanic source of carbon dioxide (CO2) to the atmosphere. Sinking particle fluxes at a depth of 4,950 m (50 m above the seafloor) in the ETP were monitored from 2003 to 2013, during which the Pacific decadal oscillation (PDO) shifted from a positive to negative phase. We show a disproportionate increase in the efficiency of the biological pump in this region relative to the increase in primary production that occurred during La Nina years following the shift of the PDO in 2008. Biogenic carbon export from the surface mixed layer was estimated from the observed particulate organic carbon and inorganic carbon fluxes at a depth of 4,950 m and from empirical equations of the vertical attenuation of carbon flux. Enhanced biological carbon export accounted for 2.3-5.5 mol C m(-2) year(-1) during the La Nina events. Despite a large uncertainty associated with these estimates, we propose that CO2 outgassing was largely suppressed by an enhanced biological pump during the La Nina events in the negative PDO phase.
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Collections - College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles
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