TY - JOUR
T1 - The Community Land Model Version 5
T2 - Description of New Features, Benchmarking, and Impact of Forcing Uncertainty
AU - Lawrence, David M.
AU - Fisher, Rosie A.
AU - Koven, Charles D.
AU - Oleson, Keith W.
AU - Swenson, Sean C.
AU - Bonan, Gordon
AU - Collier, Nathan
AU - Ghimire, Bardan
AU - van Kampenhout, Leo
AU - Kennedy, Daniel
AU - Kluzek, Erik
AU - Lawrence, Peter J.
AU - Li, Fang
AU - Li, Hongyi
AU - Lombardozzi, Danica
AU - Riley, William J.
AU - Sacks, William J.
AU - Shi, Mingjie
AU - Vertenstein, Mariana
AU - Wieder, William R.
AU - Xu, Chonggang
AU - Ali, Ashehad A.
AU - Badger, Andrew M.
AU - Bisht, Gautam
AU - van den Broeke, Michiel
AU - Brunke, Michael A.
AU - Burns, Sean P.
AU - Buzan, Jonathan
AU - Clark, Martyn
AU - Craig, Anthony
AU - Dahlin, Kyla
AU - Drewniak, Beth
AU - Fisher, Joshua B.
AU - Flanner, Mark
AU - Fox, Andrew M.
AU - Gentine, Pierre
AU - Hoffman, Forrest
AU - Keppel-Aleks, Gretchen
AU - Knox, Ryan
AU - Kumar, Sanjiv
AU - Lenaerts, Jan
AU - Leung, L. Ruby
AU - Lipscomb, William H.
AU - Lu, Yaqiong
AU - Pandey, Ashutosh
AU - Pelletier, Jon D.
AU - Perket, Justin
AU - Randerson, James T.
AU - Ricciuto, Daniel M.
AU - Sanderson, Benjamin M.
AU - Slater, Andrew
AU - Subin, Zachary M.
AU - Tang, Jinyun
AU - Thomas, R. Quinn
AU - Val Martin, Maria
AU - Zeng, Xubin
N1 - Publisher Copyright:
©2019. The Authors.
PY - 2019/12/1
Y1 - 2019/12/1
N2 - The Community Land Model (CLM) is the land component of the Community Earth System Model (CESM) and is used in several global and regional modeling systems. In this paper, we introduce model developments included in CLM version 5 (CLM5), which is the default land component for CESM2. We assess an ensemble of simulations, including prescribed and prognostic vegetation state, multiple forcing data sets, and CLM4, CLM4.5, and CLM5, against a range of metrics including from the International Land Model Benchmarking (ILAMBv2) package. CLM5 includes new and updated processes and parameterizations: (1) dynamic land units, (2) updated parameterizations and structure for hydrology and snow (spatially explicit soil depth, dry surface layer, revised groundwater scheme, revised canopy interception and canopy snow processes, updated fresh snow density, simple firn model, and Model for Scale Adaptive River Transport), (3) plant hydraulics and hydraulic redistribution, (4) revised nitrogen cycling (flexible leaf stoichiometry, leaf N optimization for photosynthesis, and carbon costs for plant nitrogen uptake), (5) global crop model with six crop types and time-evolving irrigated areas and fertilization rates, (6) updated urban building energy, (7) carbon isotopes, and (8) updated stomatal physiology. New optional features include demographically structured dynamic vegetation model (Functionally Assembled Terrestrial Ecosystem Simulator), ozone damage to plants, and fire trace gas emissions coupling to the atmosphere. Conclusive establishment of improvement or degradation of individual variables or metrics is challenged by forcing uncertainty, parametric uncertainty, and model structural complexity, but the multivariate metrics presented here suggest a general broad improvement from CLM4 to CLM5.
AB - The Community Land Model (CLM) is the land component of the Community Earth System Model (CESM) and is used in several global and regional modeling systems. In this paper, we introduce model developments included in CLM version 5 (CLM5), which is the default land component for CESM2. We assess an ensemble of simulations, including prescribed and prognostic vegetation state, multiple forcing data sets, and CLM4, CLM4.5, and CLM5, against a range of metrics including from the International Land Model Benchmarking (ILAMBv2) package. CLM5 includes new and updated processes and parameterizations: (1) dynamic land units, (2) updated parameterizations and structure for hydrology and snow (spatially explicit soil depth, dry surface layer, revised groundwater scheme, revised canopy interception and canopy snow processes, updated fresh snow density, simple firn model, and Model for Scale Adaptive River Transport), (3) plant hydraulics and hydraulic redistribution, (4) revised nitrogen cycling (flexible leaf stoichiometry, leaf N optimization for photosynthesis, and carbon costs for plant nitrogen uptake), (5) global crop model with six crop types and time-evolving irrigated areas and fertilization rates, (6) updated urban building energy, (7) carbon isotopes, and (8) updated stomatal physiology. New optional features include demographically structured dynamic vegetation model (Functionally Assembled Terrestrial Ecosystem Simulator), ozone damage to plants, and fire trace gas emissions coupling to the atmosphere. Conclusive establishment of improvement or degradation of individual variables or metrics is challenged by forcing uncertainty, parametric uncertainty, and model structural complexity, but the multivariate metrics presented here suggest a general broad improvement from CLM4 to CLM5.
KW - Earth System Modeling
KW - benchmarking
KW - carbon and nitrogen cycling
KW - global land model
KW - hydrology
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U2 - 10.1029/2018MS001583
DO - 10.1029/2018MS001583
M3 - Article
AN - SCOPUS:85076429883
SN - 1942-2466
VL - 11
SP - 4245
EP - 4287
JO - Journal of Advances in Modeling Earth Systems
JF - Journal of Advances in Modeling Earth Systems
IS - 12
ER -