High abundance of protein-like fluorescence in the Amerasian Basin of Arctic Ocean: Potential implication of a fall phytoplankton bloom
- Authors
- Chen, Meilian; Nam, Seung-Il; Kim, Ji-Hoon; Kwon, Young-Joo; Hong, Sungwook; Jung, Jinyoung; Shin, Kyung-Hoon; Hur, Jin
- Issue Date
- Dec-2017
- Publisher
- Elsevier BV
- Keywords
- Dissolved organic matter; Excitation-emission matrix (EEM); Fall phytoplankton bloom; Remote sensing; Arctic Ocean
- Citation
- Science of the Total Environment, v.599, pp.355 - 363
- Indexed
- SCIE
SCOPUS
- Journal Title
- Science of the Total Environment
- Volume
- 599
- Start Page
- 355
- End Page
- 363
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/8400
- DOI
- 10.1016/j.scitotenv.2017.04.233
- ISSN
- 0048-9697
- Abstract
- The seawater samples from the Chukchi and East Siberian Seas were collected along,a shelf-slope-basin gradient and analyzed for chromophoric and fluorescent DOM (i.e., CDOM and FDOM, respectively). Unexpected high protein -like FDOM (035 +/- 0.40 and 0.24 +/- 0.34 RU for peaks B and T, respectively) levels were identified, which corresponded to 1-2 orders of magnitude higher than those documented by previous reports. This unique phenomenon could be attributed to a fall phytoplankton bloom. The seawater chl-alpha data, estimated from in situ fluorescence measurements and satellite remote sensing data, showed the subsurface chl-a maximum of up to 1.52 mg m(-3) at similar to 25-70 m depths and the surface monthly average values (August 2015) up to 0.55 to 0.71 mg m(-3), which fall in the range of similar to 0.5-2.0 mg m(-3) during fall phytoplankton blooms in this area. Meanwhile, the depth profile of DOM parameters revealed subsurface maxima of protein-like fluorescence peaks along the shelf-slope gradient. The positive correlations between the protein-like peaks and biological index implied the lateral transport of DOM and nutrients from the shelf to the slope and basin. Despite still being a largely ice-covered environment, potential shifts in the ecosystem appear to make progress in response to changing climate in the Arctic Ocean. (C) 2017 Elsevier B.V. All rights reserved.
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