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Taxonomic variability of phytoplankton and relationship with production of CDOM in the polynya of the Amundsen Sea, Antarctica

Cited 14 time in wos
Cited 15 time in scopus
Title
Taxonomic variability of phytoplankton and relationship with production of CDOM in the polynya of the Amundsen Sea, Antarctica
Other Titles
남극 아문젠 해역 폴리냐에서의 식물플랑크톤의 종다양성과 유색용존유기물 생산과의 관계
Authors
Lee, Yoon Chang
Lee, Sang H.
Yang, Eun Jin
Jung, Jinyoung
Park, Mi Ok
Keywords
CDOMChla-aDiatomsPhaeocystisPolynyaThe Amundsen Sea
Issue Date
2016
Citation
Lee, Yoon Chang, et al. 2016. "Taxonomic variability of phytoplankton and relationship with production of CDOM in the polynya of the Amundsen Sea, Antarctica". DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, 123(1): 30-41.
Abstract
To evaluate the relationship between the phytoplankton composition and the CDOM production in the Amundsen Sea, we examined the taxonomic variability of phytoplankton, nutrients and chromophoric dissolved organic matter (CDOM) participating in two research cruises, ANA02C (February, 2012) and ANA04B (January, 2014). For both cruises, the peak concentrations of chlorophyll a (Chl-a) were mea- sured in the Amundsen Sea Polynya (ASP) where the average Chl-a concentration was 2.31 μg L A 1 ( 71.01 μg L A 1 ) in February 2012 and 3.92 μg L A 1 ( 73.14 μg L A 1 ) in January 2014. The major phyto- plankton groups were diatoms and prymnesiophytes, while the minor groups were cryptophytes, chlorophytes, dinophytes, chrysophytes and cyanophytes. The phytoplankton compositions in the sea ice zone (SIZ), the ASP and ice shelf (IS) was distinct. The predominance of Phaeocystis antarctica (P. ant- arctica) (70?90%) was observed at all stations, except in the SIZ in January 2014. While the CDOM concentrations (a355) ranged from 0.07 to 0.98 m A 1 , the average values of a355 of the euphotic layer in the ASP was 0.51 m A 1 ( 7 0.19 m A 1 ), which was much higher than any other region of the Southern Ocean. CDOM showed strong correlation with Chl-a but no relationship with salinity, which implies that bio- logical processes were the main source of CDOM. Among the major phytoplankton taxa, P. antarctica was con?rmed as the most important contributor to the production of CDOM, according to the high corre- lation between marker pigment (hex-fuco) and CDOM. The unusually high CDOM in the ASP is expected to give as impact on the environment in various aspects. As a nature of CDOM, absorption of solar radiation at the surface can result in the increase of sea surface temperature (SSTs), which will accelerate the ice melting. Also the photo-oxidation of CDOM can serve as a feedback to increasing atmospheric CO2 concentrations after peak bloom in austral summer.
URI
https://repository.kopri.re.kr/handle/201206/7417
DOI
http://dx.doi.org/10.1016/j.dsr2.2015.09.002
Type
Article
Indexed
SCI
Appears in Collections  
2014-2016, Physical and Bio-Geochemical Processes in the Amundsen Sea / Lee; Sang H. (PP15020; PP16020; PP14020)
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