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Title: How can biosphere models simulate enough vegetation biomass in the mountains of the western United States? Implications of meteorological forcing

Journal Article · · Environmental Modelling and Software

Most carbon stocks and fluxes in the western United States are found in mountainous terrain, where observations and modeling are difficult. Terrestrial biosphere models generally underestimate above-ground biomass (AGB) over this region. In this report, we identify methods to reduce this underestimation by focusing upon 1) biases in meteorological datasets, 2) model representation of water stress, and 3) spatial resolution. We adopted the widely-used Community Land Model version 4.5 (CLM 4.5) with six different meteorological datasets and found a 6-fold variation in simulated AGB across Utah/Colorado. Simulations underestimated AGB because of warm and dry biases within the meteorological datasets that reduced water availability and restricted plant growth. To eliminate the AGB underestimation we adopted a meteorological dataset designed for complex terrain (gridMET), combined with a representation of plant hydraulic stress (CLM 5.0). Conversely, changes in spatial resolution (meteorological variables and land surface description) had negligible impact on simulated AGB.

Research Organization:
University of Utah, Salt Lake City, UT (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); National Science Foundation of China; USDOE Office of Science (SC)
Grant/Contract Number:
SC0010624; SC0010625
OSTI ID:
1977104
Journal Information:
Environmental Modelling and Software, Journal Name: Environmental Modelling and Software Journal Issue: C Vol. 148; ISSN 1364-8152
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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