GEOGRAPHIC INFORMATION

Potential Evapotranspiration for 2000-2012 from MODIS

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Data Provider Montana Climate Office
Date 01/01/2000 - 12/31/2012
Content Type Downloadable Data
Abstract This raster dataset shows eight-day, monthly, yearly, eight-day normal, monthly normal and yearly normal MODIS MOD16 potential evapotranspiration in millimeters with a grid cell resolution of 1000-meters (1-kilometer) for the years 2000-2012. The MODIS MOD16 project is part of NASA/EOS project to estimate global terrestrial potential evapotranspiration from earth land surface by using satellite remote sensing data. The MOD16 PET datasets are estimated using Mu et al. improved ET algorithm (2011) over previous Mu et al. paper (2007a). The ET algorithm is based on the Penman-Monteith equation (Monteith, 1965). Surface resistance is an effective resistance to evaporation from land surface and transpiration from the plant canopy. Terrestrial ET includes evaporation from wet and moist soil, from rain water intercepted by the canopy before it reaches the ground, and the transpiration through stomata on plant leaves and stems. Evaporation of water intercepted by the canopy is a very important water flux for ecosystems with a high LAI. Canopy conductance for plant transpiration is calculated by using LAI to scale stomatal conductance up to canopy level. For many plant species during growing seasons, stomatal conductance is controlled by vapor pressure deficit (VPD) (Oren et al., 1999; Mu et al., 2007b; Running and Kimball, 2005) and daily minimum air temperature (Tmin). Tmin is used to control dormant and active growing seasons for evergreen biomes. High temperatures are often accompanied by high VPDs, leading to partial or complete closure of stomata. For a given biome type, two threshold values for Tmin and VPD are listed in the Biome-Property-Look-Up-Table (BPLUT) to control stomatal conductance (Mu et al., 2007a; 2009; 2011).
Purpose The MODIS MOD16 potential evapotranspiration product can be used to calculate regional water and energy balance, soil water status; hence, it provides key information for water resource management. With long-term ET data, the effects of changes in climate, land use, and ecosystems disturbances (e.g. wildfires and insect outbreaks) on regional water resources and land surface energy change can be quantified. The MOD16 global potential evapotranspiration (ET)/latent heat flux (LE)/potential ET (PET)/potential LE (PLE) datasets are regular 1-km2 land surface ET datasets for vegetated land areas at 8-day, monthly and annual intervals. The dataset covers the time period 2000 to 2012. Values are in millimetres.
Supplemental Information Processed from NetCDF raster file source using Python 2.7 code maintained by the Montana Climate Office.
The Montana Climate Office (MCO) provides this product/service for informational purposes only. The MCO did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should review or consult the primary data and information sources to ascertain the viability of the information for their purposes. The MCO provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the MCO be liable for any incorrect results or analysis; any direct, indirect, special, or consequential damages to any party; or any lost profits arising out of or in connection with the use or the inability to use the data or the services provided. The MCO makes these data and services available as a convenience to the public, and for no other purpose. The MCO reserves the right to change or revise published data and/or services at any time.
Data Access ftp://mco.cfc.umt.edu/pet/Readme.html
Distributor Michael D. Sweet Research and Information Systems Specialist Montana Climate Office
32 Campus Drive
 Missoula, Montana 59812-0576
Telephone: 406.243.5265
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Email: michael.sweet@umontana.edu
Distribution liability The Montana Climate Office (MCO) provides this product/service for informational purposes only. The MCO did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should review or consult the primary data and information sources to ascertain the viability of the information for their purposes. The MCO provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the MCO be liable for any incorrect results or analysis; any direct, indirect, special, or consequential damages to any party; or any lost profits arising out of or in connection with the use or the inability to use the data or the services provided. The MCO makes these data and services available as a convenience to the public, and for no other purpose. The MCO reserves the right to change or revise published data and/or services at any time.
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Metadata date 02/25/2015

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