气候变化领域集成服务门户(CCPortal): Implementation of Improved Parameterization of Terrestrial Flux in WRF-VPRM Improves the Simulation of Nighttime CO2 Peaks and a Daytime CO2 Band Ahead of a Cold Front

CCPortal

DOI	10.1029/2020JD034362
	Implementation of Improved Parameterization of Terrestrial Flux in WRF-VPRM Improves the Simulation of Nighttime CO2 Peaks and a Daytime CO2 Band Ahead of a Cold Front
	Hu X.-M.; Gourdji S.M.; Davis K.J.; Wang Q.; Zhang Y.; Xue M.; Feng S.; Moore B.; Crowell S.M.R.
发表日期	2021
ISSN	2169897X
卷号	126 期号:10
英文摘要	Enhanced CO2 mole fraction bands were often observed immediately ahead of cold front during the Atmospheric Carbon and Transport (ACT)-America mission and their formation mechanism is undetermined. Improved understanding and correct simulation of these CO2 bands are needed for unbiased inverse CO2 flux estimation. Such CO2 bands are hypothesized to be related to nighttime CO2 respiration and investigated in this study using WRF-VPRM, a weather-biosphere-online-coupled model, in which the biogenic fluxes are handled by the Vegetation Photosynthesis and Respiration Model (VPRM). While the default VPRM satisfactorily parameterizes gross ecosystem exchange, its treatment of terrestrial respiration as a linear function of temperature was inadequate as respiration is a nonlinear function of temperature and also depends on the amount of biomass and soil wetness. An improved ecosystem respiration parameterization including enhanced vegetation index, a water stress factor, and a quadratic temperature dependence is incorporated into WRF-VPRM and evaluated in a year-long simulation before applied to the investigation of the frontal CO2 band on August 4, 2016. The evaluation shows that the modified WRF-VPRM increases ecosystem respiration during the growing season, and improves model skill in reproducing nighttime near-surface CO2 peaks. A nested-domain WRF-VPRM simulation is able to capture the main characteristics of the August 4 CO2 band and informs its formation mechanism. Nighttime terrestrial respiration leads to accumulation of near-surface CO2 in the region. As the cold front carrying low-CO2 air moves southeastward, and strong photosynthesis depletes CO2 further southeast of the front, a CO2 band develops immediately ahead of the front. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	cold front; terrestrial flux; WRF-VPRM
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185220
作者单位	Center for Analysis and Prediction of Storms, University of Oklahoma, Norman, OK, United States; National Institute of Standards and Technology, Gaithersburg, MD, United States; Department of Meteorology and Atmospheric Science, Pennsylvania State University, University Park, PA, United States; Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA, United States; School of Meteorology, University of Oklahoma, Norman, OK, United States; Department of Environmental Engineering, Columbia University, New York, NY, United States; GeoCarb Mission, University of Oklahoma, Norman, OK, United States
推荐引用方式 GB/T 7714	Hu X.-M.,Gourdji S.M.,Davis K.J.,et al. Implementation of Improved Parameterization of Terrestrial Flux in WRF-VPRM Improves the Simulation of Nighttime CO2 Peaks and a Daytime CO2 Band Ahead of a Cold Front[J],2021,126(10).
APA	Hu X.-M..,Gourdji S.M..,Davis K.J..,Wang Q..,Zhang Y..,...&Crowell S.M.R..(2021).Implementation of Improved Parameterization of Terrestrial Flux in WRF-VPRM Improves the Simulation of Nighttime CO2 Peaks and a Daytime CO2 Band Ahead of a Cold Front.Journal of Geophysical Research: Atmospheres,126(10).
MLA	Hu X.-M.,et al."Implementation of Improved Parameterization of Terrestrial Flux in WRF-VPRM Improves the Simulation of Nighttime CO2 Peaks and a Daytime CO2 Band Ahead of a Cold Front".Journal of Geophysical Research: Atmospheres 126.10(2021).