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Spatiotemporal variation in summer net community production in the Amundsen Sea Polynya: A self-organizing map analysis approach

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Title
Spatiotemporal variation in summer net community production in the Amundsen Sea Polynya: A self-organizing map analysis approach
Other Titles
인공지능을 이용한 아문젠해의 순군집생산력 추정
Authors
Park, Keyhong
Hahm, Doshik
Choi, Jungok
Xu, Suqing
Kim, Hyun-cheol
Lee, Sang H.
Subject
Oceanography
Keywords
Amundsen Sea Polynya; Biological pump; Net community production; Primary production; Self-organizing map; Southern Ocean
Issue Date
2019-08
Citation
Park, Keyhong, et al. 2019. "Spatiotemporal variation in summer net community production in the Amundsen Sea Polynya: A self-organizing map analysis approach". CONTINENTAL SHELF RESEARCH, 184(1): 21-29.
Abstract
We estimated weekly summer net community production (NCP) in the Amundsen Sea Polynya for 2010-2011 and 2011-2012 using the self-organizing map analysis technique, which is a type of artificial neural network useful for discovering underlying structure in datasets. The net community production estimates derived with four variables (sea surface temperature, mixed layer depth, chlorophyll-a, and photosynthetically available radiation) robustly reproduced the observed net community production in the Amundsen Sea Polynya. The mean net community productions were estimated as 0.42 +/- 0.09 and 0.39 +/- 0.07 gC m(-2) d(-1) in 2010-2011 and 2011-2012, respectively. The maximum weekly net community production of 1.29 gC m(-2) d(-1) in 2011-2012 was greater than in 2010-2011 by 0.32 gC m(-2) d(-1). The net community production in 2010-2011, derived using the self-organizing map, showed weekly variation similar to the trend of satellite-derived production of the Eppley-Vertically Generalized Production Model. However, in 2011-2012, it exhibited different temporal variation both in peak timing and in magnitude of the bloom. This implies the existence of complex processes not readily resolved by the four variables used in our self-organizing map analysis. Therefore, further observations during different blooming stages are required to improve self-organizing map-derived net community production estimates.
URI
https://repository.kopri.re.kr/handle/201206/10934
DOI
http://dx.doi.org/10.1016/j.csr.2019.07.001
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