MERRA2 Reanalysis

Overview
Extent
    Global
Spatial Resolution
    ~50km
Data Source(s)
    NASA’s Global Modeling and Assimilation Office
Science Partner

Description

Modern-Era Retrospective analysis for Research and Applications, Version 2 (MERRA2) is a 30+ year global climate reanalysis dataset. MERRA2 uses modern satellite databases to provide climate variables such as temperature and precipitation.

 

Min Temperature: Minimum air temperature at 2m height

Max Temperature: Maximum air temperature at 2m height

Precipitation: Daily total precipitation (depth)

ASCE Grass Reference Evapotranspiration (ETo): Penman-Monteith reference ET based on a grass reference crop defined by American Society of Civil Engineers (Allen et al., 2005)

ASCE Alfalfa Reference Evapotranspiration (ETr): Penman Monteith reference ET based on a alfalfa reference crop defined by American Society of Civil Engineers (Allen et al., 2005)

Evap. Demand Drought Index (EDDI): A multi-timescale drought index based on evaporative demand of the atmosphere (Hobbins et al., 2016; McEvoy et al., 2016)

Standard Precipitation Index (SPI): A multi-timescale drought drought index based on precipitation (McKee 1993)

Standard Precipitation Evaporation Index (SPEI): A multi-timescale drought index based on precipitation minus ASCE grass reference evapotranspiration (ETo) (Vicente-Serrano 2010)

Technical Information

Feature
Detail
Extent
Global
Period of Record
1981-present
Spatial Resolution
~50km
Temporal Resolution
Daily (updated every 1-2 months)
Data Summaries
max, min, mean, median, anomalies, trend and statistical significance, spatial and temporal aggregations, time series, standardized indices
Data Source(s)
NASA’s Global Modeling and Assimilation Office (GMAO)
Data Formats
raster (geotiff), raster tile (tile ID), time series (.csv, .xls, .json, .geojson)
Sources

Allen, T. G., I. A. Walter, R. Elliot, and T. A. Howell (2005), ASCE-EWRI Standardization of Reference Evapotranspiration, Am. Soc. Civ. Eng. Water Int.

Hobbins, M. T., Wood, A., McEvoy, D. J., Huntington, J. L., Morton, C., Anderson, M., & Hain, C. (2016). The evaporative demand drought index. Part I: Linking drought evolution to variations in evaporative demand. Journal of Hydrometeorology, 17(6), 1745-1761.

McKee, T. B., N. J. Doesken, and J. Kliest, 1993: The relationship of drought frequency and duration to time scales. In Proceedings of the 8th Conference of Applied Climatology, 17-22 January, Anaheim, CA. American Meteorological Society, Boston, MA. 179-184.

McEvoy, D.J., J.L. Huntington, M. Hobbins, A. Wood, and C. Morton, James Verdin, Martha Anderson, and Christopher Hain, 2016: The Evaporative Demand Drought Index: Part II – CONUS-wide Assessment Against Common Drought Indicators. Journal of Hydrometeorology. 17, 1763-1779, doi: 10.1175/JHM-D-15-0122.1.

MERRA-2 Overview: The Modern-Era Retrospective Analysis for Research and Applications, Version 2 (MERRA-2), Ronald Gelaro, et al., 2017, J. Clim., doi: 10.1175/JCLI-D-16-0758.1

Vicente-Serrano S.M., Santiago Beguería, Juan I. López-Moreno, (2010) A Multi-scalar drought index sensitive to global warming: The Standardized Precipitation Evapotranspiration Index – SPEI. Journal of Climate 23: 1696-1718.

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