DOI: 10.1002/2014MS000344
Scopus记录号: 2-s2.0-85027956198
论文题名: Modeling methane emissions from arctic lakes: Model development and site-level study
作者: Tan Z ; , Zhuang Q ; , Walter Anthony K
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期: 2 起始页码: 459
结束页码: 483
语种: 英语
英文关键词: Climate models
; Global warming
; Methane
; Organic carbon
; Arctic lakes
; Biogeochemical modeling
; Carbon availability
; Environmental conditions
; Methane emission rates
; Methane emissions
; Seasonal variability
; Thermokarst lakes
; Lakes
; arctic environment
; biogeochemistry
; concentration (composition)
; emission inventory
; flux measurement
; ice cover
; lake ecosystem
; methane
; methanogenesis
; model validation
; nitrogen
; organic carbon
; oxidation
; permafrost
; Pleistocene
; sediment analysis
; shallow water
; thawing
; thermokarst
; transport process
; water column
; water temperature
; Alaska
; Siberia
; United States
英文摘要: To date, methane emissions from lakes in the pan-arctic region are poorly quantified. In order to investigate the response of methane emissions from this region to global warming, a process-based climate-sensitive lake biogeochemical model was developed. The processes of methane production, oxidation, and transport were modeled within a one-dimensional sediment and water column. The sizes of 14C-enriched and 14C-depleted carbon pools were explicitly parameterized. The model was validated using observational data from five lakes located in Siberia and Alaska, representing a large variety of environmental conditions in the arctic. The model simulations agreed well with the measured water temperature and dissolved CH4 concentration (mean error less than 1°C and 0.2 μM, respectively). The modeled CH4 fluxes were consistent with observations in these lakes. We found that bubbling-rate-controlling nitrogen (N2) stripping was the most important factor in determining CH4 fraction in bubbles. Lake depth and ice cover thickness in shallow waters were also controlling factors. This study demonstrated that the thawing of Pleistocene-aged organic-rich yedoma can fuel sediment methanogenesis by supplying a large quantity of labile organic carbon. Observations and modeling results both confirmed that methane emission rate at thermokarst margins of yedoma lakes was much larger (up to 538 mg CH4 m-2 d-1) than that at nonthermokarst zones in the same lakes and a nonyedoma, nonthermokarst lake (less than 42 mg CH4 m-2 d-1). The seasonal variability of methane emissions can be explained primarily by energy input and organic carbon availability. © 2015. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/76060
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
There are no files associated with this item.
作者单位: Department of Earth, Atmospheric and Planetary Sciences, Purdue University, West Lafayette, Indiana, United States; Department of Agronomy, Purdue University, West Lafayette, Indiana, United States; Water and Environmental Research Center, University of Alaska Fairbanks, Fairbanks, Alaska, United States
Recommended Citation:
Tan Z,, Zhuang Q,, Walter Anthony K. Modeling methane emissions from arctic lakes: Model development and site-level study[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(2)