These data are forecast barren land change under the PCM A2&B1 scenarios, calculated using the outputs from runs of the USFS Pacific Northwest Research Station and WWETAC MC1 Vegetation model.
MC1 Vegetation Model description:
This collection of layers includes summary statistics from input and output data used for simulation of vegetation response to climate change in California. The simulations were performed using MC1 dynamic global vegetation model (DGVM), source code revision 152. The model was parameterized and evaluated by the DGVM research group at the US Forest Service Pacific Northwest Research Station, with support from the Western Wildland Environmental Threat Assessment Center. The model was parameterized to maximize concordance with maps of potential natural vegetation and seasonal patterns of vegetation production for the historical period (1895-2009).
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The input data representing historical climate spans 1895 to 2009, and were downscaled by Flint and Flint (2012) from 2.5 arc-minute resolution PRISM data (Daly et al 1994). The input data representing future climate comprise four climate projections, representing two SRES emissions scenarios A2 and B1 simulated by two general circulation models (GCMâs) PCM and GFDL. For details on the selection of the four climate projections, see Cayan et al (2008). PCMâs climate projections span years 2000 to 2009, and GFDLâs climate projections span years 2001 to 2100. The input climate data were originally downscaled to 270 m resolution by Flint and Flint (2012) but aggregated up to 30 arc-second resolution for MC1 simulation. All input and output data cover all of California and the major basins draining into it.
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//------------- HISTORICAL ---------------
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Layer: Historical_annual_ppt
Units: mm H2O yr-1
Citations: Flint and Flint 2012
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Layer: Historical_annual_tmp
Units: degrees Celsius
Citations: Flint and Flint 2012
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Layer: Historical_seasonal_ppt
Units: mm H2O season-1
Citations: Flint and Flint 2012
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Layer: Historical_seasonal_tmp
Units: degrees Celsius
Citations: Flint and Flint 2012
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Layer: Historical_annual_consumed
MC1 Variable: CONSUMEDyr
Units: g C m-2 y-1
Citations: USDA Forest Service Pacific Northwest Research Station 2013
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Layer: Historical_annual_runoff
MC1 Variable: STREAMFLOWyr
Units: mm H2O y-1
Citations: USDA Forest Service Pacific Northwest Research Station 2013
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Layer: Historical_annual_snow_max
MC1 Variable: snow_max
Units: mm H2O
Citations: USDA Forest Service Pacific Northwest Research Station 2013
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Layer: Historical_annual_vegtype
MC1 Variable: VTYPEyr
Units: see Table 1 below
Citations: USDA Forest Service Pacific Northwest Research Station 2013
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//------------- GFDL A2 ------------------
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Layer: GFDL_A2_annual_ppt
Units: mm H2O yr-1
Citations: Flint and Flint 2012
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Layer: GFDL_A2_annual_tmp
Units: degrees Celsius
Citations: Flint and Flint 2012
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Layer: GFDL_A2_seasonal_ppt
Units: mm H2O season-1
Citations: Flint and Flint 2012
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Layer: GFDL_A2_seasonal_tmp
Units: degrees Celsius
Citations: Flint and Flint 2012
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Layer: GFDL_A2_annual_consumed
MC1 Variable: CONSUMEDyr
Units: g C m-2 y-1
Citations: USDA Forest Service Pacific Northwest Research Station
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Layer: GFDL_A2_annual_runoff
MC1 Variable: STREAMFLOWyr
Units: mm H2O y-1
Citations: USDA Forest Service Pacific Northwest Research Station
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Layer: GFDL_A2_annual_snow_max
MC1 Variable: snow_max
Units: mm H2O
Citations: USDA Forest Service Pacific Northwest Research Station
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Layer: GFDL_A2_annual_vegtype
MC1 Variable: VTYPEyr
Units: see Table 1 below
Citations: USDA Forest Service Pacific Northwest Research Station
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//------------- GFDL B1 ------------------
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Layer: GFDL_B1_annual_ppt
Units: mm H2O yr-1
Citations: Flint and Flint 2012
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Layer: GFDL_B1_annual_tmp
Units: degrees Celsius
Citations: Flint and Flint 2012
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Layer: GFDL_B1_seasonal_ppt
Units: mm H2O season-1
Citations: Flint and Flint 2012
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Layer: GFDL_B1_seasonal_tmp
Units: degrees Celsius
Citations: Flint and Flint 2012
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Layer: GFDL_B1_annual_consumed
MC1 Variable: CONSUMEDyr
Units: g C m-2 y-1
Citations: USDA Forest Service Pacific Northwest Research Station
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Layer: GFDL_B1_annual_runoff
MC1 Variable: STREAMFLOWyr
Units: mm H2O y-1
Citations: USDA Forest Service Pacific Northwest Research Station
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Layer: GFDL_B1_annual_snow_max
MC1 Variable: snow_max
Units: mm H2O
Citations: USDA Forest Service Pacific Northwest Research Station
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Layer: GFDL_B1_annual_vegtype
MC1 Variable: VTYPEyr
Units: see Table 1 below
Citations: USDA Forest Service Pacific Northwest Research Station
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//------------- PCM A2 ------------------
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Layer: PCM_A2_annual_ppt
Units: mm H2O yr-1
Citations: Flint and Flint 2012
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Layer: PCM_A2_annual_tmp
Units: degrees Celsius
Citations: Flint and Flint 2012
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Layer: PCM_A2_seasonal_ppt
Units: mm H2O season-1
Citations: Flint and Flint 2012
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Layer: PCM_A2_seasonal_tmp
Units: degrees Celsius
Citations: Flint and Flint 2012
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Layer: PCM_A2_annual_consumed
MC1 Variable: CONSUMEDyr
Units: g C m-2 y-1
Citations: USDA Forest Service Pacific Northwest Research Station
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Layer: PCM_A2_annual_runoff
MC1 Variable: STREAMFLOWyr
Units: mm H2O y-1
Citations: USDA Forest Service Pacific Northwest Research Station
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Layer: PCM_A2_annual_snow_max
MC1 Variable: snow_max
Units: mm H2O
Citations: USDA Forest Service Pacific Northwest Research Station
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Layer: PCM_A2_annual_vegtype
MC1 Variable: VTYPEyr
Units: see Table 1 below
Citations: USDA Forest Service Pacific Northwest Research Station
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//------------- PCM B1 ------------------
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Layer: PCM_B1_annual_ppt
Units: mm H2O yr-1
Citations: Flint and Flint 2012
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Layer: PCM_B1_annual_tmp
Units: degrees Celsius
Citations: Flint and Flint 2012
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Layer: PCM_B1_seasonal_ppt
Units: mm H2O season-1
Citations: Flint and Flint 2012
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Layer: PCM_B1_seasonal_tmp
Units: degrees Celsius
Citations: Flint and Flint 2012
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Layer: PCM_B1_annual_consumed
MC1 Variable: CONSUMEDyr
Units: g C m-2 y-1
Citations: USDA Forest Service Pacific Northwest Research Station
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Layer: PCM_B1_annual_runoff
MC1 Variable: STREAMFLOWyr
Units: mm H2O y-1
Citations: USDA Forest Service Pacific Northwest Research Station
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Layer: PCM_B1_annual_snow_max
MC1 Variable: snow_max
Units: mm H2O
Citations: USDA Forest Service Pacific Northwest Research Station
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Layer: PCM_B1_annual_vegtype
MC1 Variable: VTYPEyr
Units: see Table 1 below
Citations: USDA Forest Service Pacific Northwest Research Station
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Table 1. Vegetation Types
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Code    Type
1Â Â Â Â Â Â Â Â Â Â Â Â Â Barren
2Â Â Â Â Â Â Â Â Â Â Â Â Â Alpine
6Â Â Â Â Â Â Â Â Â Â Â Â Â Subalpine
7Â Â Â Â Â Â Â Â Â Â Â Â Â Maritime Needleleaf Forest
8Â Â Â Â Â Â Â Â Â Â Â Â Â Temperate Needleleaf Forest
11Â Â Â Â Â Â Â Â Â Â Temperate Warm Mixed Forest
12Â Â Â Â Â Â Â Â Â Â Temperate Needleleaf Woodland
15Â Â Â Â Â Â Â Â Â Â Temperate Warm Mixed Woodland
16Â Â Â Â Â Â Â Â Â Â Temperate Shrubland
17Â Â Â Â Â Â Â Â Â Â Temperate Grassland
18Â Â Â Â Â Â Â Â Â Â Temperate Desert
21Â Â Â Â Â Â Â Â Â Â Subtropical Evergreen Broadleaf Forest
22Â Â Â Â Â Â Â Â Â Â Subtropical Mixed Forest
25Â Â Â Â Â Â Â Â Â Â Subtropical Evergreen Broadleaf Woodland
26Â Â Â Â Â Â Â Â Â Â Subtropical Mixed Woodland
27Â Â Â Â Â Â Â Â Â Â Subtropical Shrubland
28Â Â Â Â Â Â Â Â Â Â Subtropical Grassland
29Â Â Â Â Â Â Â Â Â Â Subtropical Desert
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References:
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Cayan DR, Maurer EP, Dettinger MD, Tyree M, Hayhoe K (2008) Climate change scenarios for the California region. Climatic Change 87(Suppl 1):S21-S42.
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Daly, C., R.P. Neilson, and D.L. Phillips, 1994: A Statistical-Topographic Model for Mapping Climatological Precipitation over Mountanious Terrain. J. Appl. Meteor., 33, 140-158.
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Flint, Lorraine E., and Alan L. Flint. "Downscaling future climate scenarios to fine scales for hydrologic and ecological modeling and analysis." Ecological Processes 1.1 (2012): 1-15.
