Global reference evapotranspiration for food-security monitoring (ver. 2.1, April 2024)

Summary

The data are a long-term (1980-present), daily reanalysis of reference evapotranspiration, covering the globe at a spatial resolution of 0.625° Longitude x 0.5° Latitude. Reference evapotranspiration is a measure of evaporative demand, or the "thirst of the atmosphere", basically how much moisture from the surface could evaporate into overpassing air, assuming (i) that enough water is available to evaporate and (ii) the surface is covered with a specific reference crop that completely shades the ground (some other conditions also apply). For this dataset, reference evapotranspiration is derived from the daily implementation of the Penman-Monteith reference evapotranspiration equation (Monteith, 1965) as codified in the FAO-56 report (FAO, 1998), which is the international standard for reference evapotranspiration estimation. The equation is driven by data from the Modern-Era Retrospective analysis for Research and Applications, Version 2 (MERRA-2; Gelaro et al., 2017). The MERRA-2 input data are at a spatial resolution of 0.5 deg lat x 0.625 deg long; the reference evapotranspiration output data are at the same spatial resolution. There are two outputs, one for each reference crop: ETos is the reference evapotranspiration from a short crop (0.12-m grass); ETrs is the reference evapotranspiration from a long-crop (0.5-m alfalfa).

Monteith, J.L., 1965, Evaporation and the Environment. 19th Symposia of the Society for Experimental Biology, 19, 205-234.
Allen, R.G., Pereira, L.S., Raes, D., Smith, M., 1998, Crop Evapotranspiration-Guidelines for Computing Crop Water Requirements-FAO Irrigation and Drainage Paper 56. FAO, Rome, 300(9): D05109.

Gelaro, R., McCarty, W., Suárez, M. J., Todling, R., Molod, A., Takacs, L., Randles, C. A., Darmenov, A., Bosilovich, M. G., Reichle, R., Wargan, K., Coy, L., Cullather, R., Draper, C., Akella, S., Buchard, V., Conaty, A., da Silva, A. M., Gu, W., Kim, G., Koster, R., Lucchesi, R., Merkova, D., Nielsen, J. E., Partyka, G., Pawson, S., Putman, W., Rienecker, M., Schubert, S. D., Sienkiewicz, M., & Zhao, B., 2017, The Modern-Era Retrospective Analysis for Research and Applications, Version 2 (MERRA-2). Journal of Climate, 30(14), 5419-5454. https://doi.org/10.1175/JCLI-D-16-0758.1

First posted - August 22, 2022
Revised - October 10, 2023 (version 2.0)
Data addition - April 10, 2024 (version 2.1)

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Attached Files

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reference_et_project_v2.1.xml Original FGDC Metadata	View	20.14 KB	application/fgdc+xml
“Daily short-crop reference ET for 2000-2023”		4.43 GB	application/zip
“Daily tall-crop reference ET for 2000-2023”		4.42 GB	application/zip
ETrs_2023.zip “Daily tall-crop reference ET”		188.46 MB	application/zip
ETos_2023.zip “Daily short-crop reference ET”		188.31 MB	application/zip
metadata_for ETos_ETrs.zip “meta data files for ETos and ETrs data”		10.35 KB	application/zip
reference_et_project_v2.1.txt		753 Bytes	text/plain
“Daily tall-crop reference ET for 1980-1999”		3.7 GB	application/x-zip-compressed
“Daily short-crop reference ET for 1980-1999”		3.69 GB	application/x-zip-compressed
ETrs_2020.zip “Daily tall-crop reference ET”		189.67 MB	application/zip
ETrs_2021.zip “Daily tall-crop reference ET”		189.15 MB	application/zip
ETrs_2022.zip “Daily tall-crop reference ET”		189.13 MB	application/zip
ETrs_2019.zip “Daily tall-crop reference ET”		189.16 MB	application/zip
ETrs_2018.zip “Daily tall-crop reference ET”		189.11 MB	application/zip
ETrs_2017.zip “Daily tall-crop reference ET”		189.13 MB	application/zip
ETrs_2015.zip “Daily tall-crop reference ET”		189.15 MB	application/zip
ETrs_2016.zip “Daily tall-crop reference ET”		189.66 MB	application/zip
ETrs_2014.zip “Daily tall-crop reference ET”		189.12 MB	application/zip
ETrs_2013.zip “Daily tall-crop reference ET”		189.13 MB	application/zip
ETrs_2012.zip “Daily tall-crop reference ET”		189.65 MB	application/zip
ETrs_2010.zip “Daily tall-crop reference ET”		189.14 MB	application/zip
ETrs_2011.zip “Daily tall-crop reference ET”		189.11 MB	application/zip
ETrs_2009.zip “Daily tall-crop reference ET”		189.11 MB	application/zip
ETrs_2008.zip “Daily tall-crop reference ET”		189.66 MB	application/zip
ETrs_2007.zip “Daily tall-crop reference ET”		189.12 MB	application/zip
ETrs_2006.zip “Daily tall-crop reference ET”		189.13 MB	application/zip
ETrs_2000.zip “Daily tall-crop reference ET”		189.66 MB	application/zip
ETrs_2005.zip “Daily tall-crop reference ET”		189.15 MB	application/zip
ETrs_2003.zip “Daily tall-crop reference ET”		189.13 MB	application/zip
ETrs_2004.zip “Daily tall-crop reference ET”		189.65 MB	application/zip
ETrs_2001.zip “Daily tall-crop reference ET”		189.14 MB	application/zip
ETrs_2002.zip “Daily tall-crop reference ET”		189.16 MB	application/zip
ETrs_1990.zip “Daily tall-crop reference ET”		189.18 MB	application/zip
ETrs_1996.zip “Daily tall-crop reference ET”		189.67 MB	application/zip
ETrs_1992.zip “Daily tall-crop reference ET”		189.67 MB	application/zip
ETrs_1993.zip “Daily tall-crop reference ET”		189.18 MB	application/zip
ETrs_1991.zip “Daily tall-crop reference ET”		189.15 MB	application/zip
ETrs_1994.zip “Daily tall-crop reference ET”		189.16 MB	application/zip
ETrs_1995.zip “Daily tall-crop reference ET”		189.18 MB	application/zip
ETrs_1998.zip “Daily tall-crop reference ET”		189.17 MB	application/zip
ETrs_1999.zip “Daily tall-crop reference ET”		189.16 MB	application/zip
ETrs_1997.zip “Daily tall-crop reference ET”		189.18 MB	application/zip
ETrs_1985.zip “Daily tall-crop reference ET”		189.13 MB	application/zip
ETrs_1987.zip “Daily tall-crop reference ET”		189.17 MB	application/zip
ETrs_1982.zip “Daily tall-crop reference ET”		189.17 MB	application/zip
ETrs_1989.zip “Daily tall-crop reference ET”		189.17 MB	application/zip
ETrs_1983.zip “Daily tall-crop reference ET”		189.18 MB	application/zip
ETrs_1984.zip “Daily tall-crop reference ET”		189.68 MB	application/zip
ETrs_1988.zip “Daily tall-crop reference ET”		189.68 MB	application/zip
ETrs_1986.zip “Daily tall-crop reference ET”		189.15 MB	application/zip
ETrs_1980.zip “Daily tall-crop reference ET”		189.66 MB	application/zip
ETrs_1981.zip “Daily tall-crop reference ET”		189.17 MB	application/zip
ETos_2021.zip “Daily short-crop reference ET”		189.02 MB	application/zip
ETos_2014.zip “Daily short-crop reference ET”		188.99 MB	application/zip
ETos_2009.zip “Daily short-crop reference ET”		188.99 MB	application/zip
ETos_2016.zip “Daily short-crop reference ET”		189.52 MB	application/zip
ETos_2019.zip “Daily short-crop reference ET”		189.01 MB	application/zip
ETos_2020.zip “Daily short-crop reference ET”		189.54 MB	application/zip
ETos_2008.zip “Daily short-crop reference ET”		189.53 MB	application/zip
ETos_2013.zip “Daily short-crop reference ET”		189 MB	application/zip
ETos_2012.zip “Daily short-crop reference ET”		189.52 MB	application/zip
ETos_2010.zip “Daily short-crop reference ET”		189.02 MB	application/zip
ETos_2005.zip “Daily short-crop reference ET”		189.01 MB	application/zip
ETos_2006.zip “Daily short-crop reference ET”		189 MB	application/zip
ETos_2004.zip “Daily short-crop reference ET”		189.51 MB	application/zip
ETos_2001.zip “Daily short-crop reference ET”		189.01 MB	application/zip
ETos_2000.zip “Daily short-crop reference ET”		189.53 MB	application/zip
ETos_2002.zip “Daily short-crop reference ET”		189.02 MB	application/zip
ETos_2018.zip “Daily short-crop reference ET”		188.98 MB	application/zip
ETos_2022.zip “Daily short-crop reference ET”		189 MB	application/zip
ETos_2003.zip “Daily short-crop reference ET”		188.99 MB	application/zip
ETos_2015.zip “Daily short-crop reference ET”		189 MB	application/zip
ETos_2011.zip “Daily short-crop reference ET”		188.98 MB	application/zip
ETos_2007.zip “Daily short-crop reference ET”		188.98 MB	application/zip
ETos_2017.zip “Daily short-crop reference ET”		188.99 MB	application/zip
ETos_1993.zip “Daily short-crop reference ET”		189.04 MB	application/zip
ETos_1997.zip “Daily short-crop reference ET”		189.04 MB	application/zip
ETos_1998.zip “Daily short-crop reference ET”		189.03 MB	application/zip
ETos_1992.zip “Daily short-crop reference ET”		189.53 MB	application/zip
ETos_1991.zip “Daily short-crop reference ET”		189.01 MB	application/zip
ETos_1999.zip “Daily short-crop reference ET”		189.03 MB	application/zip
ETos_1990.zip “Daily short-crop reference ET”		189.04 MB	application/zip
ETos_1995.zip “Daily short-crop reference ET”		189.05 MB	application/zip
ETos_1994.zip “Daily short-crop reference ET”		189.03 MB	application/zip
ETos_1996.zip “Daily short-crop reference ET”		189.53 MB	application/zip
ETos_1987.zip “Daily short-crop reference ET”		189.04 MB	application/zip
ETos_1989.zip “Daily short-crop reference ET”		189.04 MB	application/zip
ETos_1986.zip “Daily short-crop reference ET”		189.02 MB	application/zip
ETos_1988.zip “Daily short-crop reference ET”		189.55 MB	application/zip
ETos_1983.zip “Daily short-crop reference ET”		189.05 MB	application/zip
ETos_1980.zip “Daily short-crop reference ET”		189.54 MB	application/zip
ETos_1984.zip “Daily short-crop reference ET”		189.55 MB	application/zip
ETos_1981.zip “Daily short-crop reference ET”		189.04 MB	application/zip
ETos_1982.zip “Daily short-crop reference ET”		189.03 MB	application/zip
ETos_1985.zip “Daily short-crop reference ET”		189.01 MB	application/zip
code.zip		8.66 KB	application/zip

Purpose

This long-term, daily, global and physically based estimate of reference evapotranspiration provides a robust estimate of atmospheric evaporative demand to support the food-security monitoring efforts of the Famine Early Warning Systems Network (FEWS NET) and other interested users in that sector.

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Type	Scheme	Key
DOI	https://www.sciencebase.gov/vocab/category/item/identifier	doi:10.5066/P9IIQMV1

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Global reference evapotranspiration for food-security monitoring (ver. 2.1, April 2024)

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