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Seasonal differences in dissolved organic matter properties and sources in an Arctic fjord: Implications for future conditions

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Title
Seasonal differences in dissolved organic matter properties and sources in an Arctic fjord: Implications for future conditions
Other Titles
북극 피오리오드 안에서의 용존유기물의 특성과 기원의 계절적 차이: 미래 환경변화에 대한 영향
Authors
Simona Retelletti Brogi
Jung, Jinyoung
Ha, Sun-Yong
허 진
Keywords
Arctic; Chlorophyll-a; DOM; EEMs; Kongsfjorden; Molecular size distribution
Issue Date
2019
Citation
Simona Retelletti Brogi, et al. 2019. "Seasonal differences in dissolved organic matter properties and sources in an Arctic fjord: Implications for future conditions". SCIENCE OF THE TOTAL ENVIRONMENT, 694(1): 133740-133748.
Abstract
The Arctic Ocean is undergoing drastic changes due to the effects of climate change. Arctic fjords are preferred systems to study these changes as they respond quickly to variations in ocean, land and atmosphere conditions. In this study, we investigated for the first time the seasonal variability of dissolved organic matter (DOM) properties and its origin in an Arctic fjord, which allows for an assessment of the future potential effects of climate change in this environment. We conducted an integrated analysis of the concentrations, optical properties (absorption and fluorescence), and molecular size distributions of DOM in two seasons (October 2017 and April 2018) and in eight to ten stations in Kongsfjorden (Svalbard) along with the related environmental parameters such as chlorophyll-a, inorganic nutrients, particulate organic carbon (POC), temperature, and salinity. Our results showed that, in both seasons, the DOM in the fjord was predominately of autochthonous origin with a seasonally variable terrestrial input. The dissolved organic carbon (DOC) concentrations were consistently higher in October than in April at each station. Fluorescence spectroscopy revealed a marked seasonal variability depending on the DOM fluorophore types and size fractions. In October, humic-like and tryptophan-like substances were dominantwhereas in April, tyrosine-like compounds represented, on average, 58% of the DOMfluorescence. This study points out the key role of spring sea ice melting in determining the DOM properties of the fjord in spring.
URI
http://repository.kopri.re.kr/handle/201206/10143
DOI
http://dx.doi.org/10.1016/j.scitotenv.2019.133740
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