Chromophoric dissolved organic matter (CDOM) in first-year sea ice in the western Canadian Arctic

doi:10.1016/j.marchem.2014.07.007

	Chromophoric dissolved organic matter (CDOM) in first-year sea ice in the western Canadian Arctic
	Xie, Huixiang(1); Aubry, Cyril(2); Zhang, Yong(3); Song, Guisheng(4); Xie, Huixiang
发表期刊	Marine Chemistry
ISSN	0304-4203
	2014-07-31
卷号	165 页码:25-35
关键词	Cdom Absorption Coefficient Maas Photochemistry Sea Ice Arctic
DOI	10.1016/j.marchem.2014.07.007
产权排序	(1) Institut des Sciences de la Mer de Rimouski, Université du Québec Rimouski, Rimouski; QC, Canada; (2) Département de biologie, Université Laval, Québec, Québec, Canada; (3) Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong Province, China; (4) School of Marine Science and Engineering, Tianjin University of Science and Technology, Tianjin, China
作者部门	中科院海岸带环境过程与生态修复重点实验室
英文摘要	We monitored the spatiotemporal progression of chromophoric dissolved organic matter (CDOM) in first-year sea ice in the western Canadian Arctic between mid-March and early July 2008. CDOM abundance in bottom ice, as quantified by absorption coefficient at 325 nm, a(CDOM)(325), showed a positive, linear relationship with the concentration of chlorophyll a, being low at the start of ice algal accumulation, highly enriched during the peak bloom and early post-bloom, and depleted again during sea ice melting. Vertical profiles of CDOM in early and late spring were typically characterized by slight to moderate elevations at both the surface and bottom and rather constancy within the interior ice. In the ice algae-thriving mid-spring, L-type profiles prevailed due to extremely high CDOM in the lowermost 10-cm layer. Bottom-layer CDOM in landfast ice (a(CDOM)(325): 15.8 m(-1)) more than doubled that in drift ice (a(CDOM)(325): 6.6 m(-1)). CDOM in the ice cover, except the bottom layer, was generally lower than or similar to that in the under-ice surface water. Salinity accounted for 58% of the CDOM variability in drift ice having minimal terrestrial and ice algal signatures. CDOM absorption spectra of algaerich bottom ice samples exhibited ultraviolet (UV) absorption shoulders attributable to mycosporine-like amino acids (MAAs). These compounds were readily photodegradable by solar UV radiation. Our results suggest that 1) inclusion of organic solutes and in situ biological production are the dominant processes controlling the distribution of CDOM in sea ice in the study area, 2) biological production in bottom ice is a minor source of CDOM to the underlying surface water; 3) CDOM plays a critical role in shielding sympagic organisms in bottom ice against UV radiation; 4) the MAAs are effective photoprotectants only under low-UV conditions. (C) 2014 Elsevier B.V. All rights reserved.
文章类型	期刊论文
资助机构	Chemistry, Multidisciplinary ; Oceanography
收录类别	SCI
语种	英语
WOS记录号	WOS:000343381800003
引用统计	被引频次：20[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.yic.ac.cn/handle/133337/8839
专题	中国科学院海岸带环境过程与生态修复重点实验室
通讯作者	Xie, Huixiang
推荐引用方式 GB/T 7714	Xie, Huixiang,Aubry, Cyril,Zhang, Yong,et al. Chromophoric dissolved organic matter (CDOM) in first-year sea ice in the western Canadian Arctic[J]. Marine Chemistry,2014,165:25-35.
APA	Xie, Huixiang,Aubry, Cyril,Zhang, Yong,Song, Guisheng,&Xie, Huixiang.(2014).Chromophoric dissolved organic matter (CDOM) in first-year sea ice in the western Canadian Arctic.Marine Chemistry,165,25-35.
MLA	Xie, Huixiang,et al."Chromophoric dissolved organic matter (CDOM) in first-year sea ice in the western Canadian Arctic".Marine Chemistry 165(2014):25-35.

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