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DOI	10.5194/acp-22-14075-2022
	Fluorescence characteristics, absorption properties, and radiative effects of water-soluble organic carbon in seasonal snow across northeastern China
	Niu, Xiaoying; Pu, Wei; Fu, Pingqing; Chen, Yang; Xing, Yuxuan; Wu, Dongyou; Chen, Ziqi; Shi, Tenglong; Zhou, Yue; Wen, Hui; Wang, Xin
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	14075
结束页码	14094
卷号	22 期号:21 页码:20
英文摘要	Water-soluble organic carbon (WSOC) in the cryosphere can significantly influence the global carbon cycle and radiation budget. However, WSOC in the snowpack has received little scientific attention to date. This study reports the fluorescence characteristics, absorption properties, and radiative effects of WSOC based on 34 snow samples collected from sites in northeastern China. A significant degree of regional WSOC variability is found, with concentrations ranging from 0.5 +/- 0.2 to 5.7 +/- 3.7 mu g g(-1) (average concentration: 3.6 +/- 3.2 mu g g(-1)). The three principal fluorescent components of WSOC are identified as (1) the high-oxygenated humic-like substances (HULIS-1) of terrestrial origin, (2) the low-oxygenated humic-like substances (HULIS-2) of mixed origin, and (3) the protein-like substances (PRLIS) derived from autochthonous microbial activity. In southeastern Inner Mongolia (SEIM), a region dominated by desert and exposed soils, the WSOC exhibits the highest humification index (HIX) but the lowest fluorescence (FI) and biological (BIX) indices; the fluorescence signal is mainly attributed to HULIS-1 and thus implicates soil as the primary source. By contrast, the HIX (FI and BIX) value is the lowest (highest), and the percentage of PRLIS is the highest in the remote area of northeastern Inner Mongolia (NEIM), suggesting a primarily biological source. For south and north of northeastern China (SNC and NNC), both of which are characterized by intensive agriculture and industrial activity, the fluorescence signal is dominated by HULIS-2, and the HIX, FI, and BIX values are all moderate, indicating the mixed origins for WSOC (anthropogenic activity, microbial activity, and soil). We also observe that, throughout northeastern China, the light absorption of WSOC is dominated by HULIS-1, followed by HULIS-2 and PRLIS. The contribution of WSOC to albedo reduction (average concentration: 3.6 mu g g(-1)) in the ultraviolet-visible (UV-Vis) band is approximately half that of black carbon (BC average concentration: 0.6 mu g g(-1)). Radiative forcing is 3.8 (0.8) W m(-2) in old (fresh) snow, equating to 19 % (17 %) of the radiative forcing of BC. These results indicate that WSOC has a profound impact on snow albedo and the solar radiation balance.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000878129500001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273809
作者单位	Lanzhou University; Tianjin University
推荐引用方式 GB/T 7714	Niu, Xiaoying,Pu, Wei,Fu, Pingqing,et al. Fluorescence characteristics, absorption properties, and radiative effects of water-soluble organic carbon in seasonal snow across northeastern China[J],2022,22(21):20.
APA	Niu, Xiaoying.,Pu, Wei.,Fu, Pingqing.,Chen, Yang.,Xing, Yuxuan.,...&Wang, Xin.(2022).Fluorescence characteristics, absorption properties, and radiative effects of water-soluble organic carbon in seasonal snow across northeastern China.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(21),20.
MLA	Niu, Xiaoying,et al."Fluorescence characteristics, absorption properties, and radiative effects of water-soluble organic carbon in seasonal snow across northeastern China".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.21(2022):20.