README.md

In Timothy-W-Hilton/VPRMLandSfcModel: R implementation of VPRM with parameter estimation

VPRMLandSfcModel-package: R implementation of VPRM with parameter estimation

Description:

Provides an R implementation of the Vegetation Photosynthesis and Respiration Model (VPRM) of Mahadevan et al (2008), the urbanVPRM of Hardiman et al (2017), and tools to estimate VPRM parameter values from observations. VPRM is a simple diagnostic land surface model based on light-use efficiency. VPRM diagnoses gross ecosystem exchange (GEE) of carbon dioxide, ecosystem respiration (R), and net ecosystem exchange (NEE) of carbon dioxide. The urbanVPRM adapts the VPRM to urban settings by adjusting GEE and R to account for impervious surface area and the urban heat island effect. (urban)VPRM parameters may be estimated separately for different subsets of a dataset of observations. If the Rmpi package is installed, such separate parameter estimations may be run in parallel.

Details:

• Package: VPRMLandSfcModel
• Type: Package
• Version: 1.3.1
• Date: 2023-07-07
• License: GPL-3
• LazyLoad: yes

The literature in the references section provides a detailed description of VPRM.

The top-level function for running VPRM is vprm_calc_NEE. vprm_calc_NEE calculates net ecosystem exchange (NEE) according to the VPRM (Mahadevan et al (2008) eqn 12).

The top-level function for estimating VPRM parameters from observations is estimate_VPRM_pars.

The other functions provide methods to obtain the necessary driver data and to calculate some of the intermediate quantities that VPRM derives from remote sensing observations (e.g. land surface water index, Tscale, Pscale, etc.).

The package includes two datasets: - Park_Falls contains ground-observed as well as satellite-observed driver data for VPRM from the Park Falls, Wisconsin, USA Ameriflux site. - VPRM_parameters contains values for VPRM parameters lambda, PAR_0, alpha, and beta. The parameter values were determined by optimizing VPRM using 65 North American eddy covariance sites as described in Hilton etal (2013).

Installation

library('devtools')
install_github('Timothy-W-Hilton/VPRMLandSfcModel')

Usage

The vignette document 'VPRM_vignette', included with the package, provides several "getting started" usage examples.

library('VPRMLandSfcModel')
RShowDoc('VPRM_vignette', package='VPRMLandSfcModel')

Author(s):

Timothy W. Hilton

Maintainer: Timothy W. Hilton [e-mail]

References:

To cite the Vegetation Photosynthesis Respiration Model (VPRM) itself, use:

Mahadevan, P., Wofsy, S.C., Matross, D.M., Xiao, X., Dunn, A.L., Lin, J.C., Gerbig, C., Munger, J.W., Chow, V.Y., and Gottlieb, E.W., 2008. A satellite-based biosphere parameterization for net ecosystem CO2 exchange: Vegetation photosynthesis and respiration model (VPRM). Global Biogeochemical Cycles, 22, GB2005. doi:10.1029/2006GB002735.

To cite the urban Vegetation Photosynthesis Respiration Model (urbanVPRM) use

Hardiman, B. S., Wang, J. A., Hutyra, L. R., Gately, C. K., Getson, J. M., & Friedl, M. A. (2017). Accounting for urban biogenic fluxes in regional carbon budgets. Science of The Total Environment, 592, 366–372. https://doi.org/https://doi.org/10.1016/j.scitotenv.2017.03.028

To cite the R package 'VPRMLandSfcModel', use:

Hilton, T. W., Davis, K. J., Keller, K., and Urban, N. M.: Improving North American terrestrial CO2 flux diagnosis using spatial structure in land surface model residuals, Biogeosciences, 10, 4607-4625, doi:10.5194/bg-10-4607-2013, 2013.

Additionally, the code itself now has a DOI:

Timothy-W-Hilton/VPRMLandSfcModel documentation built on July 29, 2023, 8:43 p.m.