DayCent-UV grassland productivity across the midwestern and western conterminous United States.

This dataset provides information about daily and annual simulated aboveground plant productivity (ANPP) in grasslands grid cells across the midwestern and western conterminous United States from 1984 to 2015.  Annual ANPP estimates from Rangeland Analysis Platform (RAP) are included for comparison.

Files Description:

Grid_Cells_Shapefile.zip

Contains the spatial distribution for each simulated grassland grid cell. Each grid cell is identified by a grid number ranging from 0 to 2712, a col number increasing from west to east, and a row number increasing from south to north. 

Daily_ANPP_DayCent-UV.zip:

Each NetCDF file contains the daily ANPP information for each grid cell during a specifc year. Daily ANPP  for a grid cell can be acessed in the cropANPP variable, which depends on the grid cell identifier row and col, and time for the day of the year.

For example, using the library xarray from Python, the daily ANPP value  for a California grassland grid cell (grid : 1207, row: 78, col: 24) in day 150 in year 2000 can be obtained by using the following command lines:

import xarray as xr

dataset = xr.open_dataset( folder_directory + '/Daily_ANPP_DayCent-UV/daycent_cwrf_2000.nc')

time = 150

lon_index = 24

lat_index = 78 

value =  dataset.cropANPP[time, lat_index, lon_index].values

To calculate annual ANPP for each grid cell, sum the cropANPP values across all days within a file. 

Annual_ANPP_DAYCENT-UV_1986-2015.csv

Contains the simulated annual ANPP  in the cum_ANPP column (gC/m²),  for each year and each grid cell  identified by grid,  lon, lat ,row, col  (see shapefile description)

Annual_ANPP_RAP_1986-2015.csv

Provides RAP's annual ANPP estimates for each grid cell, identified by its grid number, by using two different equations: 

Gerardhi & Sala equation: RAP-ANPP estimates are located in column RAP_Sala_biomass (g Biomass/m²), together with the annual fraction of carbon allocated to shoots in  fANPP_Sala

Hiu equation:  RAP-ANPP estimates are located in column RAP_Hiu_biomass, together with the annual fraction of carbon allocated to shoots in  fANPP_Hiu.

We assumed a factor of 2.4 (gBiomass/m²)/(gC) to convert gC/m² to gBiomass/m².