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2 results for “DayCent”
DayCent-UV grassland productivity across the midwestern and western conterminous United States.
<p>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.</p> <p><strong>Files Description:</strong></p> <ul> <li><strong>Grid_Cells_Shapefile.zip</strong></li> </ul> <p>Contains<strong> </strong>the spatial distribution for each simulated grassland grid cell. Each grid cell is identified by a <code>grid</code> number ranging from 0 to 2712, a <code>col</code> number increasing from west to east, and a <code>row</code> number increasing from south to north. </p> <ul> <li><strong>Daily_ANPP_DayCent-UV.zip:</strong></li> </ul> <p>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 <code>cropANPP</code> variable, which depends on the grid cell identifier <code>row</code> and <code>col</code>, and <code>time</code> for the day of the year.</p> <p>For example, using the library <em>xarray</em> 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:</p> <p>import xarray as xr</p> <p>dataset = xr.open_dataset( folder_directory + '/Daily_ANPP_DayCent-UV/daycent_cwrf_2000.nc')</p> <p>time = 150</p> <p>lon_index = 24</p> <p>lat_index = 78 </p> <p>value = dataset.cropANPP[time, lat_index, lon_index].values</p> <p>To calculate annual ANPP for each grid cell, sum the <code>cropANPP</code> values across all days within a file. </p> <ul> <li><strong>Annual_ANPP_DAYCENT-UV_1986-2015.csv</strong></li> </ul> <p>Contains the simulated annual ANPP in the <code>cum_ANPP</code> column (gC/m²), for each <code>year</code> and each grid cell identified by <code>grid</code>, <code>lon</code>, <code>lat</code> ,<code>row</code>, <code>col</code> (see shapefile description)</p> <ul> <li><strong>Annual_ANPP_RAP_1986-2015.csv</strong></li> </ul> <p>Provides RAP's annual ANPP estimates for each grid cell, identified by its <code>grid</code> number, by using two different equations: </p> <ul> <li> <ul> <li>Gerardhi & Sala equation: RAP-ANPP estimates are located in column <code>RAP_Sala_biomass</code> (g Biomass/m²), together with the annual fraction of carbon allocated to shoots in <code>fANPP_Sala</code></li> <li>Hiu equation: RAP-ANPP estimates are located in column <code>RAP_Hiu_biomass</code>, together with the annual fraction of carbon allocated to shoots in <code>fANPP_Hiu</code>.</li> </ul> </li> </ul> <p>We assumed a factor of 2.4 (gBiomass/m²)/(gC) to convert gC/m² to gBiomass/m².</p>
DayCent simulations for California annual grasslands: Monthly data outputs
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