DOI: 10.1029/2012JD018122
论文题名: Sensitivity of net ecosystem exchange and heterotrophic respiration to parameterization uncertainty
作者: Exbrayat J.-F. ; Pitman A.J. ; Abramowitz G. ; Wang Y.-P.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 4 起始页码: 1640
结束页码: 1651
语种: 英语
英文关键词: Fluxtower
; heterotrophic respiration
; land surface carbon budget
; land surface model
; land surface respiration
; soil carbon
Scopus关键词: Carbon
; Parameterization
; Soil moisture
; Surface measurement
; Temperature
; Fluxtower
; Heterotrophic respiration
; Land surface
; Land surface models
; Soil carbon
; Environmental engineering
; biogeochemical cycle
; carbon budget
; land surface
; net ecosystem exchange
; numerical model
; parameterization
; respiration
; sensitivity analysis
; soil carbon
; soil temperature
; uncertainty analysis
; vegetation type
英文摘要: We examine the uncertainty in net ecosystem exchange due to the model treatment of heterotrophic respiration in a variety of hydroclimatic conditions using a land surface model. Multiple soil temperature-respiration functions and soil moisture-respiration functions are incorporated into the Carnegie-Ames-Stanford Approach with Carbon-Nitrogen-Phosphorus (CASA-CNP) biogeochemical model coupled to the Community Atmosphere Biosphere Land Exchange land surface model. Every possible combination of the newly implemented functions is then used to simulate heterotrophic respiration and net ecosystem exchange at 10 different flux towers covering a large range of global vegetation types. Results show that a large uncertainty in the simulated net ecosystem exchange is attributable to differences in the soil respiration parameterization. No single combination of soil temperature and moisture-respiration functions appears to show superior performance across all sites. Large variations in the simulated evolution of soil carbon storages emphasize the problem that to use an observationally based soil temperature or soil moisture response function requires a land surface model to capture the observed soil temperature and soil moisture mean and variability correctly. Land surface models are known to vary dramatically in their simulation of the soil moisture state and probably in their simulation of soil temperature. Resolving how to simulate heterotrophic respiration and net ecosystem exchange will therefore require an accurate simulation of temperature and moisture combined with a realistic soil heterotrophic respiration parameterization, and these cannot be developed and implemented in isolation. Key PointsMoisture and temperature controls on soil Rh are uncertain in LSMsNo response function performs better at all studied sitesDifferent response functions lead to different signs of NEE © 2012. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63904
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Climate Change Research Centre, ARC Centre of Excellence for Climate System Science, University of New South Wales, Sydney, NSW 2052, Australia; Centre for Australian Weather and Climate Research, CSIRO Marine and Atmospheric Research, Aspendale, VIC, Australia
Recommended Citation:
Exbrayat J.-F.,Pitman A.J.,Abramowitz G.,et al. Sensitivity of net ecosystem exchange and heterotrophic respiration to parameterization uncertainty[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(4)