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Exploring the Roles of Iron and Irradiance in Dynamics of Diatoms and Phaeocystis in the Amundsen Sea Continental Shelf Water

Cited 4 time in wos
Cited 6 time in scopus

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dc.contributor.authorKwon, Young Shin-
dc.contributor.authorLa, Hyoung Sul-
dc.contributor.authorJung, Jinyoung-
dc.contributor.authorLee, Sang Heon-
dc.contributor.authorKim, Tae-Wan-
dc.contributor.authorKang, Hyoun-Woo-
dc.contributor.authorLee, SangHoon-
dc.date.accessioned2021-11-26T08:16:44Z-
dc.date.available2021-11-26T08:16:44Z-
dc.date.issued2021-03-
dc.identifier.urihttps://repository.kopri.re.kr/handle/201206/12987-
dc.description.abstractThe Amundsen Sea continental shelf (ACS) water ecosystem is expected to undergo changes since increasing melt rate of glacier and decreasing sea ice extent by global warming would lead to the mitigation of iron and light limitation. We investigated how diatoms and Phaeocystis, two dominant taxa, and primary production in the ACS water would respond to variations in iron and light availabilities by using a 1-D pelagic ecosystem model. In the model, we added sea ice effects that reduce light penetration and optimized model parameters for diatoms and Phaeocystis. The results from our model showed good agreement with 20-year observations of Chl-a as well as the biomass proportion of diatoms and Phaeocystis and nutrient distributions during the growing season. Our model experimental results suggest that the current moderate iron and high light conditions favor the growth of Phaeocystis over diatoms. Moreover, as iron increases, the organic carbon exudation by phytoplankton increases more rapidly than net primary production (NPP), leading to a decline in phytoplankton biomass. On the other hand, irradiance plays a role in controlling NPP in terms of photoinhibition which is reduced by increasing iron. Increases in both iron and irradiance lead to an advance in the timing of the bloom peak (surface Chl-a maximum) due to increases in phytoplankton carbon loss and photoinhibition. Our results imply that the dominance of Phaeocystis can continue and that the carbon uptake capacity of the ACS in the summer seasons might increase given that iron availability will increase with future climate change. Plain Language Summary We firmly believe that this research based on an optimum biogeochemical model developed for the Amundsen Sea continental shelf water is of sufficiently broad interest for the public as well as the scientific community, since it advances the study of phytoplankton ecology and carbon uptake in the Antarctic coastal area. A complex coupled ocean-ecosystem model was developed to investigate dynamics of the two dominant species (diatoms and Phaeocystis) in the ACS water, one of the most rapidly warming regions on Earth with extremely high primary productivity. These two groups are particularly important as they could significantly contribute to the carbon export into the deep ocean. The model is able to accurately address the temporal evolution of diatoms and Phaeocystis responding to the variations of nutrients, iron, and irradiance. We show these two groups of phytoplankton are controlled by the rate of irradiance and iron availability in terms of the net primary production (NPP), biomass contribution, and bloom period. This research presents new evidence that the short-term export production of Phaeocystis-derived carbon can become stronger in the future with increasing basal melt in the coastal waters around the Antarctic continent.en_US
dc.languageEnglishen_US
dc.language.isoenen_US
dc.subjectOceanographyen_US
dc.subject.classificationAraonen_US
dc.titleExploring the Roles of Iron and Irradiance in Dynamics of Diatoms and Phaeocystis in the Amundsen Sea Continental Shelf Wateren_US
dc.title.alternative아문센해 규조류와 페오시스티스에 대한 철과 빛의 역활en_US
dc.typeArticleen_US
dc.identifier.bibliographicCitationKwon, Young Shin, et al. 2021. "Exploring the Roles of Iron and Irradiance in Dynamics of Diatoms and Phaeocystis in the Amundsen Sea Continental Shelf Water". <em>JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS</em>, 126(3): 1-23.-
dc.citation.titleJOURNAL OF GEOPHYSICAL RESEARCH-OCEANSen_US
dc.citation.volume126en_US
dc.citation.number3en_US
dc.identifier.doi10.1029/2020JC016673-
dc.citation.startPage1en_US
dc.citation.endPage23en_US
dc.description.articleClassificationSCIE-
dc.description.jcrRateJCR 2019:10.448en_US
dc.subject.keywordAmundsen Seaen_US
dc.subject.keywordDiatomen_US
dc.subject.keywordEcosystem modelen_US
dc.subject.keywordPhaeocystisen_US
dc.identifier.localId2021-0094-
dc.identifier.scopusid2-s2.0-85103170582-
dc.identifier.wosid000636285300013-
Appears in Collections  
2020-2020, Ecosystem Structure and Function of Marine Protected Area (MPA) in Antarctica (20-20) / Kim, Jeong-Hoon (PM20060)
2021-2021, Carbon cycle change and ecosystem response under the Southern Ocean warming (21-21) / Park, Jisoo (PE21110)
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