Penman-Monteith-Leuning Evapotranspiration (ET) Version2 in R

Dongdong Kong, CUG

TODO

• 以NorthChina为输入，测试PMLV2的核心代码；

• 植被驱动数据，等待GEE跑完Albedo，然后进行线性插值、历史平均插值处理；

• 气象驱动数据，从GEE截取，tiff转nc；

• 模型参数率定，截取通量站驱动数据，重新率定模型参数（ERA5L, GLDASv2.1, GLDASv2.2, CFSV2, MERRA2）；

Installation

You can install the development version of PMLV2 like so:

remotes::install_github("gee-hydro/PMLV2")

pak::pkg_install(c("phenofit"))
pak::pkg_install(c("rpkgs/rfluxnet", "rpkgs/nctools"))

Example

See the following instruction:

https://gee-hydro.github.io/PML.R/articles/model_forcing.html

https://gee-hydro.github.io/PML.R/articles/run_model.html

Validation ET

• Eddy covariance flux

  https://fluxnet.org/data/fluxnet2015-dataset/fullset-data-product

• Basin-scale water balance

  $$E_{wb} = P - R - \Delta S + RES_s$$

  $$E_{wb} ≈ P - R - \Delta S$$

  1. GRDC streamflow, https://portal.grdc.bafg.de/applications/public.html?publicuser=PublicUser#dataDownload/Stations
  2. USGS streamflow, https://github.com/DOI-USGS/dataRetrieval/

• Atmosphere moisture balance

  $$E_{atm} = P + Div + \Delta W - RES_w$$

  $$E_{atm} ≈ P + Div$$

  1. ERA5 monthly, https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-single-levels-monthly-means?tab=form

References

1. Zhang, Y., Kong, D., Gan, R., Chiew, F. H. S., McVicar, T. R., Zhang, Q., & Yang, Y. (2019). Coupled estimation of 500 m and 8-day resolution global evapotranspiration and gross primary production in 2002–2017. Remote Sensing of Environment, 222, 165–182. https://doi.org/10.1016/j.rse.2018.12.031

2. Kong, D., Zhang, Y., Gu, X., & Wang, D. (2019). A robust method for reconstructing global MODIS EVI time series on the Google Earth Engine. ISPRS Journal of Photogrammetry and Remote Sensing, 155, 13–24. https://doi.org/10.1016/j.isprsjprs.2019.06.014