Modeled Land Atmosphere Coupling Response to Soil Moisture Changes with Different Generations of Land Surface Models
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Meteorology Department, Institute of Geosciences, University of Bonn, 53121 Bonn, Germany
2
Centre for High-Performance Scientific Computing, Geoverbund ABC/J, 52425 Jülich, Germany
*
Author to whom correspondence should be addressed.
Water 2020, 12(1), 46; https://doi.org/10.3390/w12010046
Received: 5 November 2019
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Revised: 10 December 2019
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Accepted: 18 December 2019
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Published: 20 December 2019
(This article belongs to the Section Hydrology)
An idealized study with two land surface models (LSMs): TERRA-Multi Layer (TERRA-ML) and Community Land Model (CLM) alternatively coupled to the same atmospheric model COSMO (Consortium for Small-Scale Modeling), reveals differences in the response of the LSMs to initial soil moisture. The bulk parameterization of evapotranspiration pathways, which depends on the integrated soil moisture of active layers rather than on each discrete layer, results in a weaker response of the surface energy flux partitioning to changes in soil moisture for TERRA-ML, as compared to CLM. The difference in the resulting surface energy flux partitioning also significantly affects the model response in terms of the state of the atmospheric boundary layer. For vegetated land surfaces, both models behave quite differently for drier regimes. However, deeper reaching root fractions in CLM align both model responses with each other. In general, differences in the parameterization of the available root zone soil moisture, evapotranspiration pathways, and the soil-vegetation structure in the two LSMs are mainly responsible for the diverging tendencies of the simulated land atmosphere coupling responses.
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Keywords:
modeled evapotranspiration pathways; soil-vegetation-structure; land-atmosphere coupling response
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MDPI and ACS Style
Shrestha, P.; Simmer, C. Modeled Land Atmosphere Coupling Response to Soil Moisture Changes with Different Generations of Land Surface Models. Water 2020, 12, 46. https://doi.org/10.3390/w12010046
AMA Style
Shrestha P, Simmer C. Modeled Land Atmosphere Coupling Response to Soil Moisture Changes with Different Generations of Land Surface Models. Water. 2020; 12(1):46. https://doi.org/10.3390/w12010046
Chicago/Turabian StyleShrestha, Prabhakar, and Clemens Simmer. 2020. "Modeled Land Atmosphere Coupling Response to Soil Moisture Changes with Different Generations of Land Surface Models" Water 12, no. 1: 46. https://doi.org/10.3390/w12010046
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