CHELSA_v1.0 (http://chelsa-climate.org/) is a high resolution (30 arc sec, ~1 km) climate data set for the earth land surface areas. Version 1.0 is a first release. It includes monthly and annual mean temperature and precipitation patterns for the time period 1979-2013. CHELSA_v1 is based on a quasi-mechanistical statistical downscaling of the ERA interim global circulation model
(http://www.ecmwf.int/en/research/climate-reanalysis/era-interim) with a GPCC (https://www.dwd.de/EN/ourservices/gpcc/gpcc.html) and GHCN (https://www.ncdc.noaa.gov/ghcnm/) bias correction.
Specifications:
High resolution (30 arcsec, ~1 km)
Precipitation & Temperature
Monthly coverage 1979 - 2013
Incorporation of topoclimate (e.g. orographic rainfall & wind fields). Downscaled ERA-interim model. Allows calculation of derived parameters based on monthly values such as length of dry periods etc.
Karger, Dirk Nikolaus; Conrad, Olaf; Böhner, Jürgen; Kawohl, Tobias; Kreft, Holger; Soria-Auza, Rodrigo Wilber; Zimmermann, Niklaus E.; Linder, H. Peter; Kessler, Michael (2016). CHELSA climatologies at high resolution for the earth's land surface areas (Version 1.0). World Data Center for Climate (WDCC) at DKRZ. https://doi.org/10.1594/WDCC/CHELSA_v1
Swiss National Science Foundation Grant/Award No: 146906 - Unraveling the mechanisms determining the diversity of tropical plant communities: examples from the early diverging land plants
For a detailed description of the methods see: (http://128.84.21.199/abs/1607.00217)
CHELSA_v1 is based on a quasi-mechanistical statistical downscaling of the ERA interim global circulation model (http://www.ecmwf.int/en/research/climate-reanalysis/era-interim ) with a GPCC bias correction ( https://www.dwd.de/EN/ourservices/gpcc/gpcc.html ).
Resolution: High resolution (30 arcsec, ~1 km), monthly mean coverage 1979 - 2013
Structure: Incorporation of topoclimate (e.g. orographic rainfall & wind fields)
Global grids with the extent: West 180 E 180 W 90 N 90 S, Cell Size 0.008333, Number of Columns 43207, Number of Rows 21599. Geographic projection
Boundary condition and input data: Downscaled ERA-interim model and incorporation of topoclimate (e.g. orographic rainfall & wind fields)
Avoidance of spatial regression approaches and related problems
Allows calculation of derived parameters based on monthly values such as length of dry periods etc.
The grid extent contains rows larger than that of GMTED2010. This is due to cropping step during the algorithm which created 7 empty rows. This leads to the problem that the data cannot be read correctly into GrassGIS. The issue has be fixed in Version 1.1 (coming soon)
Monthly precipitation Version 1 has no GHCN bias correction (only GPCC). The monthly values therefore do not sum up to the annual values of Version 1.0. This issue has been fixed in Version 1.1 (coming soon).
Completeness report
Missing values are indicated with -99999 (ocean).
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Description
Missing values are indicated with -99999 (ocean).
Areas between 179.284 E and 180 E as well -88.275 and -90 are missing in Version 1.0. This is due to a problem with the SAGA module which is used to transfer the ERA interim grids to a -180 to 180 extent. The algorithm could not wrap around the dateline, leading to missing values. The issue will be addressed in the forthcoming versions.
FAIR
F-UJI result: total 66 %
Description
Summary: Findable: 6 of 7 level; Accessible: 2 of 3 level; Interoperable: 3 of 4 level; Reusable: 5 of 10 level
SQA - Scientific Quality Assurance 'approved by author'
Result Date
2016-09-20
Technical Quality Assurance (TQA)
TQA - Technical Quality Assurance 'approved by WDCC'
Description
1. Number of data sets is correct and > 0: passed; 2. Size of every data set is > 0: passed; 3. The data sets and corresponding metadata are accessible: passed; 4. The data sizes are controlled and correct: passed; 5. The temporal coverage description (metadata) is consistent to the data: passed; 6. The format is correct: passed; 7. Variable description and data are consistent: passed
Method
WDCC-TQA checklist
Method Description
Checks performed by WDCC. The list of TQA metrics are documented in the 'WDCC User Guide for Data Publication' Chapter 8.1.1