气候变化领域集成服务门户(CCPortal): Global Model for Depth-Dependent Carbonyl Photochemical Production Rates in Seawater

CCPortal

DOI	10.1029/2019GB006431
	Global Model for Depth-Dependent Carbonyl Photochemical Production Rates in Seawater
	Zhu Y.; Kieber D.J.
发表日期	2020
ISSN	0886-6236
EISSN	1944-9224
卷号	34 期号:4
英文摘要	A photochemical model was used to quantify the global contribution of carbonyl photoproduction in the photodegradation of marine dissolved organic carbon (DOC). As model input, wavelength- and temperature-dependent apparent quantum yields (AQYs) for the photochemical production of carbonyl compounds were determined in seawater collected from the Northwest Atlantic Ocean. These AQY data and published AQY data from the North Pacific were used with remotely sensed seawater optical properties and solar irradiance data in a global model to calculate depth-resolved, mixed-layer photochemical fluxes of acetaldehyde and glyoxal in seawater. Based on this model, the annual global surface mixed-layer photochemical production is 89.7 ± 36 Tg year−1 for acetaldehyde and 20.0 ± 8.0 Tg year−1 for glyoxal. This work significantly improves our understanding of the impact of photochemistry on the cycling of DOC in the surface oceans. Low-molecular-weight carbonyl compounds represent the second largest carbon flux among all known carbon products that are produced during the photolysis of DOC. The annual photoproduction of carbonyl-compound carbon is ~110 ± 23 Tg C year−1, comprising approximately 9.6% of the total carbon and 22% of the biologically labile carbon that are produced globally from the photolysis of marine DOC. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	acetaldehyde; glyoxal; methylglyoxal; photochemistry; remote sensing; SeaCDOM and SeaUV
语种	英语
scopus关键词	carbonyl compound; dissolved inorganic carbon; ecological modeling; molecular analysis; photochemistry; photodegradation; seawater; solar radiation; water temperature; Atlantic Ocean; Atlantic Ocean (Northwest)
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129651
作者单位	Department of Chemistry, State University of New York, College of Environmental Science and Forestry, 1 Forestry Drive, Syracuse, NY, United States; Now at Wadsworth Center, New York State Department of Health, Albany, NY, United States
推荐引用方式 GB/T 7714	Zhu Y.,Kieber D.J.. Global Model for Depth-Dependent Carbonyl Photochemical Production Rates in Seawater[J],2020,34(4).
APA	Zhu Y.,&Kieber D.J..(2020).Global Model for Depth-Dependent Carbonyl Photochemical Production Rates in Seawater.Global Biogeochemical Cycles,34(4).
MLA	Zhu Y.,et al."Global Model for Depth-Dependent Carbonyl Photochemical Production Rates in Seawater".Global Biogeochemical Cycles 34.4(2020).