TerraClimate: Monthly Climate and Climatic Water Balance for Global Terrestrial Surfaces, University of Idaho

IDAHO_EPSCOR/TERRACLIMATE
Dataset Availability
1958-01-01T00:00:00 - Present
Dataset Provider
Earth Engine Snippet
ee.ImageCollection("IDAHO_EPSCOR/TERRACLIMATE")
Tags
climate global monthly geophysical palmer drought evapotranspiration precipitation runoff temperature vapor wind idaho

Description

TerraClimate is a dataset of monthly climate and climatic water balance for global terrestrial surfaces. It uses climatically aided interpolation, combining high-spatial resolution climatological normals from the WorldClim dataset, with coarser spatial resolution, but time-varying data from CRU Ts4.0 and the Japanese 55-year Reanalysis (JRA55). Conceptually, the procedure applies interpolated time-varying anomalies from CRU Ts4.0/JRA55 to the high-spatial resolution climatology of WorldClim to create a high-spatial resolution dataset that covers a broader temporal record.

Temporal information is inherited from CRU Ts4.0 for most global land surfaces for temperature, precipitation, and vapor pressure. However, JRA55 data is used for regions where CRU data had zero climate stations contributing (including all of Antarctica, and parts of Africa, South America, and scattered islands). For primary climate variables of temperature, vapor pressure, and precipitation, the University of Idaho provides additional data on the number of stations (between 0 and 8) that contributed to the CRU Ts4.0 data used by TerraClimate. JRA55 was used exclusively for solar radiation and wind speeds.

TerraClimate additionally produces monthly surface water balance datasets using a water balance model that incorporates reference evapotranspiration, precipitation, temperature, and interpolated plant extractable soil water capacity. A modified Thornthwaite-Mather climatic water-balance model and extractable soil water storage capacity data was used at a 0.5° grid from Wang-Erlandsson et al. (2016).

Data Limitations:

  1. Long-term trends in data are inherited from parent datasets. TerraClimate should not be used directly for independent assessments of trends.

  2. TerraClimate will not capture temporal variability at finer scales than parent datasets and thus is not able to capture variability in orographic precipitation ratios and inversions.

  3. The water balance model is very simple and does not account for heterogeneity in vegetation types or their physiological response to changing environmental conditions.

  4. Limited validation in data-sparse regions (e.g., Antarctica).

Bands

Resolution
2.5 arc minutes

Bands

Name Units Min Max Scale Description
aet mm 0* 3140* 0.1

Actual evapotranspiration, derived using a one-dimensional soil water balance model

def mm 0* 4548* 0.1

Climate water deficit, derived using a one-dimensional soil water balance model

pdsi -4317* 3418* 0.01

Palmer Drought Severity Index

pet mm 0* 4548* 0.1

Reference evapotranspiration (ASCE Penman-Montieth)

pr mm 0* 7245*

Precipitation accumulation

ro mm 0* 12560*

Runoff, derived using a one-dimensional soil water balance model

soil mm 0* 8882* 0.1

Soil moisture, derived using a one-dimensional soil water balance model

srad W/m^2 0* 5477* 0.1

Downward surface shortwave radiation

swe mm 0* 32767*

Snow water equivalent, derived using a one-dimensional soil water balance model

tmmn °C -770* 387* 0.1

Minimum temperature

tmmx °C -670* 576* 0.1

Maximum temperature

vap kPa 0* 14749* 0.001

Vapor pressure

vpd kPa 0* 1113* 0.01

Vapor pressure deficit

vs m/s 0* 2923* 0.01

Wind-speed at 10m

* estimated min or max value

Image Properties

Image Properties

Name Type Description
status STRING

'provisional' or 'permanent'

Terms of Use

Terms of Use

The data set is in the public domain as licensed under the Creative Commons Public Domain (CC0) license.

Citations

Citations:
  • Abatzoglou, J.T., S.Z. Dobrowski, S.A. Parks, K.C. Hegewisch, 2018, Terraclimate, a high-resolution global dataset of monthly climate and climatic water balance from 1958-2015, Scientific Data 5:170191, doi: 10.1038/sdata.2017.191

Explore in Earth Engine

var dataset = ee.ImageCollection('IDAHO_EPSCOR/TERRACLIMATE')
                  .filter(ee.Filter.date('2017-07-01', '2017-08-01'));
var maximumTemperature = dataset.select('tmmx');
var maximumTemperatureVis = {
  min: -300.0,
  max: 300.0,
  palette: [
    '1a3678', '2955bc', '5699ff', '8dbae9', 'acd1ff', 'caebff', 'e5f9ff',
    'fdffb4', 'ffe6a2', 'ffc969', 'ffa12d', 'ff7c1f', 'ca531a', 'ff0000',
    'ab0000'
  ],
};
Map.setCenter(71.72, 52.48, 3);
Map.addLayer(maximumTemperature, maximumTemperatureVis, 'Maximum Temperature');

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