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Optical and molecular characterization of dissolved organic matter (DOM) in the Arctic ice core and the underlying seawater (Cambridge Bay, Canada): Implication for increased autochthonous DOM during ice melting

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Title
Optical and molecular characterization of dissolved organic matter (DOM) in the Arctic ice core and the underlying seawater (Cambridge Bay, Canada): Implication for increased autochthonous DOM during ice melting
Other Titles
북극 (캐나다 케임브리지 베이) 해빙 및 해빙 아래 해수의 용존 유기물의 광학적, 분자적 특성
해빙 중 증가된 autochthonous 용존유기물에 대한 시사점
Authors
Simona Retelletti Brogi
Hur, Jin
Lee, Yun Kyung
Morgane Derrien
Kim, Kwanwoo
Ha, Sun-Yong
Subject
Environmental Sciences & Ecology
Keywords
Arctic; DOM; EEM-PARAFAC; FT-ICR-MS; SEC-OCD; Sea ice
Issue Date
2018-06-15
Citation
Simona Retelletti Brogi, et al. 2018. "Optical and molecular characterization of dissolved organic matter (DOM) in the Arctic ice core and the underlying seawater (Cambridge Bay, Canada): Implication for increased autochthonous DOM during ice melting". SCIENCE OF THE TOTAL ENVIRONMENT, 627(0): 802-811.
Abstract
Sea ice contains a large amount of dissolved organic matter (DOM), which can be released into the ocean once it melts. In this study, Arctic sea ice DOM was characterized for its optical (fluorescence) properties as well as the molecular sizes and composition via size exclusion chromatography and Fourier transformation ion cyclotron resonancemass spectrometry (FT-ICR MS). Ice cores were collected along with the underlying seawater samples in Cambridge Bay, an Arctic area experiencing seasonal ice formation. The ice core samples revealed a marked enrichment of dissolved organic carbon (DOC) compared to the seawater counterparts (up to 6.2 times greater). The accumulation can be attributed to in situ production by the autotrophic and heterotrophic communities. Fluorescence excitation emission matrices (EEMs) elaborated with parallel factor analysis (PARAFAC) evidenced the prevalence of protein-like substances in the ice cores,which likely results fromin situ production followed by accumulation in the ice. Size exclusion chromatography further revealed the in situ production of all DOM size fractions, with the exception of the humic substance fraction. The majority of DOM in both the ice and seawater consists of lowmolecularweight compounds (b350 Da) probably derived by the microbial degradation/transformation of freshly produced DOM. Molecular characterization also supported the in situ production of DOM and highlighted the marked difference in molecular composition between sea ice and seawater. This study provides new insights into the possible role of sea ice DOM in the Arctic carbon cycle under climate change.
URI
http://repository.kopri.re.kr/handle/201206/9501
DOI
http://dx.doi.org/10.1016/j.scitotenv.2018.01.251
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