DOI: 10.1002/2015MS000573
Scopus记录号: 2-s2.0-84959891224
论文题名: Denitrification, leaching, and river nitrogen export in the Community Earth System Model
作者: Nevison C ; , Hess P ; , Riddick S ; , Ward D
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2016
卷: 8, 期: 1 起始页码: 272
结束页码: 291
语种: 英语
英文关键词: Carbon
; Denitrification
; Leaching
; Nitrogen
; Runoff
; Sediments
; Community land models
; Dissolved inorganic nitrogens
; Dissolved organic nitrogen
; Downstream impacts
; Earth system model
; Model configuration
; Nitrogen cycles
; Nitrogen limitation
; Rivers
; biogeochemical cycle
; carbon cycle
; climate modeling
; coastal zone
; denitrification
; dissolved inorganic nitrogen
; dissolved organic nitrogen
; fluvial deposit
; human activity
; inorganic nitrogen
; leaching
; nitrogen
; nitrogen cycle
; river basin
; runoff
; trace gas
; Arctic
英文摘要: River nitrogen export is simulated within the Community Earth System Model (CESM) by coupling nitrogen leaching and runoff fluxes from the Community Land Model (CLM) to the River Transport Model (RTM). The coupled CLM-RTM prognostically simulates the downstream impact of human N cycle perturbation on coastal areas. It also provides a framework for estimating denitrification fluxes of N2 and associated trace gases like N2O in soils and river sediments. An important limitation of the current model is that it only simulates dissolved inorganic nitrogen (DIN) river export, due to the lack of dissolved organic nitrogen (DON) and particulate nitrogen (PN) leaching fluxes in CLM. In addition, the partitioning of soil N loss in CLM between the primary loss pathways of denitrification and N leaching/runoff appears heavily skewed toward denitrification compared to other literature estimates, especially in nonagricultural regions, and also varies considerably among the four model configurations presented here. River N export is generally well predicted in the model configurations that include midlatitude crops, but tends to be underpredicted in rivers that are less perturbed by human agriculture. This is especially true in the tropics, where CLM likely underestimates leaching and runoff of all forms of nitrogen. River export of DIN is overpredicted in some relatively unperturbed Arctic rivers, which may result from excessive N inputs to those regions in CLM. Better representation of N loss in CLM can improve confidence in model results with respect to the core model objective of simulating nitrogen limitation of the carbon cycle. © 2016 The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75928
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Institute for Arctic and Alpine Research, University of Colorado, Boulder, CO, United States; Department of Biological Environmental Engineering, Cornell University, Ithaca, NY, United States; Centre for Atmospheric Science, University of Cambridge, Cambridge, United Kingdom; Department of Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, United States
Recommended Citation:
Nevison C,, Hess P,, Riddick S,et al. Denitrification, leaching, and river nitrogen export in the Community Earth System Model[J]. Journal of Advances in Modeling Earth Systems,2016-01-01,8(1)