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Spectral Characterization of Dissolved Organic Matter in Seawater and Sediment Pore Water from the Arctic Fjords (West Svalbard) in Summer

Cited 1 time in wos
Cited 1 time in scopus
Title
Spectral Characterization of Dissolved Organic Matter in Seawater and Sediment Pore Water from the Arctic Fjords (West Svalbard) in Summer
Other Titles
여름철 북극 피오르드(서스발바드)의 해수 및 퇴적물 공극수의 용존 유기물 스펙트럼 특성
Authors
Chen, Meilian
Kim, Ji-Hoon
Hong, Sungwook
Lee, Yun Kyung
Kang, Moo Hee
Jin, Young Keun
Hur, Jin
Subject
Environmental Sciences & EcologyWater Resources
Keywords
Arctic glaciomarine sedimentdissolved organic matterexcitation emission matrixglaciofluvial runoffice algal bloom
Issue Date
2021-01
Citation
Chen, Meilian, et al. 2021. "Spectral Characterization of Dissolved Organic Matter in Seawater and Sediment Pore Water from the Arctic Fjords (West Svalbard) in Summer". WATER, 13(2): 1-16.
Abstract
Fjords in the high Arctic, as aquatic critical zones at the interface of land-ocean continuum, are undergoing rapid changes due to glacier retreat and climate warming. Yet, little is known about the biogeochemical processes in the Arctic fjords. We measured the nutrients and the optical properties of dissolved organic matter (DOM) in both seawater and sediment pore water, along with the remote sensing data of the ocean surface, from three West Svalbard fjords. A cross-fjord comparison of fluorescence fingerprints together with downcore trends of salinity, Cl-, and PO43- revealed higher impact of terrestrial inputs (fluorescence index: similar to 1.2-1.5 in seawaters) and glaciofluvial runoffs (salinity: similar to 31.4 +/- 2.4 psu in pore waters) to the southern fjord of Hornsund as compared to the northern fjords of Isfjorden and Van Mijenfjorden, tallying with heavier annual runoff to the southern fjord of Hornsund. Extremely high levels of protein-like fluorescence (up to similar to 4.5 RU) were observed at the partially sea ice-covered fjords in summer, in line with near-ubiquity ice-edge blooms observed in the Arctic. The results reflect an ongoing or post-phytoplankton bloom, which is also supported by the higher levels of chlorophyll a fluorescence at the ocean surface, the very high apparent oxygen utilization through the water column, and the nutrient drawdown at the ocean surface. Meanwhile, a characteristic elongated fluorescence fingerprint was observed in the fjords, presumably produced by ice-edge blooms in the Arctic ecosystems. Furthermore, alkalinity and the humic-like peaks showed a general downcore accumulation trend, which implies the production of humic-like DOM via a biological pathway also in the glaciomarine sediments from the Arctic fjords.
URI
https://repository.kopri.re.kr/handle/201206/13007
DOI
http://dx.doi.org/10.3390/w13020202
Type
Article
Station
해당사항없음
Indexed
SCIE
Appears in Collections  
2018-2019, Investigation of submarine resource environment and seabed methane release in the Arctic (18-19) / Jin, Young Keun (PM18050)
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