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Title: Evaluating the E3SM Land Model at a temperate forest site using flux and soil water measurements

Abstract

Accurate simulations of soil respiration and carbon dioxide (CO 2) efflux are critical to project global biogeochemical cycles and the magnitude of carbon (C) feedbacks to climate change in Earth system models (ESMs). Currently, soil respiration is not represented well in ESMs, and few studies have attempted to address this deficiency. In this study, we evaluated the simulation of soil respiration in the Energy Exascale Earth System Model (E3SM) using long-term observations from the Missouri Ozark AmeriFlux (MOFLUX) forest site in the central U.S. Simulations using the default model parameters significantly underestimated annual soil respiration and gross primary production, while underestimating soil water potential during growing seasons and overestimating it during non-growing seasons. A site-specific soil water retention curve significantly improved modelled soil water potential, gross primary production and soil respiration. However, the model continued to underestimate soil respiration during peak growing seasons, and overestimate soil respiration during non-peak growing seasons. One potential reason may be that the current model does not adequately represent the seasonal cycle of microbial organisms and soil macroinvertebrates, which have high biomass and activity during peak growing seasons and tend to be dormant during non-growing seasons. In conclusion, our results confirm that modelling soil respirationmore » can be significantly improved by better model representations of the soil water retention curve.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Environmental Sciences Division & Climate Change Science Inst.
  2. Univ. of Missouri, Columbia, MO (United States). School of Natural Resources
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1468013
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Geoscientific Model Development Discussions (Online)
Additional Journal Information:
Journal Name: Geoscientific Model Development Discussions (Online); Journal ID: ISSN 1991-962X
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Liang, Junyi, Wang, Gangsheng, Ricciuto, Daniel M., Gu, Lianhong, Hanson, Paul J., Wood, Jeffrey, and Mayes, Melanie A. Evaluating the E3SM Land Model at a temperate forest site using flux and soil water measurements. United States: N. p., 2018. Web. doi:10.5194/gmd-2018-34.
Liang, Junyi, Wang, Gangsheng, Ricciuto, Daniel M., Gu, Lianhong, Hanson, Paul J., Wood, Jeffrey, & Mayes, Melanie A. Evaluating the E3SM Land Model at a temperate forest site using flux and soil water measurements. United States. doi:10.5194/gmd-2018-34.
Liang, Junyi, Wang, Gangsheng, Ricciuto, Daniel M., Gu, Lianhong, Hanson, Paul J., Wood, Jeffrey, and Mayes, Melanie A. Mon . "Evaluating the E3SM Land Model at a temperate forest site using flux and soil water measurements". United States. doi:10.5194/gmd-2018-34. https://www.osti.gov/servlets/purl/1468013.
@article{osti_1468013,
title = {Evaluating the E3SM Land Model at a temperate forest site using flux and soil water measurements},
author = {Liang, Junyi and Wang, Gangsheng and Ricciuto, Daniel M. and Gu, Lianhong and Hanson, Paul J. and Wood, Jeffrey and Mayes, Melanie A.},
abstractNote = {Accurate simulations of soil respiration and carbon dioxide (CO2) efflux are critical to project global biogeochemical cycles and the magnitude of carbon (C) feedbacks to climate change in Earth system models (ESMs). Currently, soil respiration is not represented well in ESMs, and few studies have attempted to address this deficiency. In this study, we evaluated the simulation of soil respiration in the Energy Exascale Earth System Model (E3SM) using long-term observations from the Missouri Ozark AmeriFlux (MOFLUX) forest site in the central U.S. Simulations using the default model parameters significantly underestimated annual soil respiration and gross primary production, while underestimating soil water potential during growing seasons and overestimating it during non-growing seasons. A site-specific soil water retention curve significantly improved modelled soil water potential, gross primary production and soil respiration. However, the model continued to underestimate soil respiration during peak growing seasons, and overestimate soil respiration during non-peak growing seasons. One potential reason may be that the current model does not adequately represent the seasonal cycle of microbial organisms and soil macroinvertebrates, which have high biomass and activity during peak growing seasons and tend to be dormant during non-growing seasons. In conclusion, our results confirm that modelling soil respiration can be significantly improved by better model representations of the soil water retention curve.},
doi = {10.5194/gmd-2018-34},
journal = {Geoscientific Model Development Discussions (Online)},
number = ,
volume = ,
place = {United States},
year = {Mon Mar 05 00:00:00 EST 2018},
month = {Mon Mar 05 00:00:00 EST 2018}
}

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