A Data-driven Upscale Product of Global Gross Primary Production, Net Ecosystem Exchange and Ecosystem Respiration

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The product includes 10-day means of global gross primary production (GPP), net ecosystem exchange (NEE), and ecosystem respiration (RECO) of 1999 to 2019 in 0.1x0.1 degree spatial resolution. Random Forest (RF) was used to upscale observations of FLUXNET 2015 to the globe from 60°S to 80°N. The daily GPP was extracted from GPP_NT_VUT_REF, NEE from NEE_VUT_REF and RECO from RECO_NT_VUT_REF in the FULLSET of FLUXNET 2015. Predictor variables include leaf area index (LAI), fraction of absorbed photosynthetically active radiation (FAPAR), air temperature (T), relative humidity (RH), downward solar radiation (DSR) on the surface, the minimum and maximum of LAI, and the number of LAI larger than the means of the minimum and maximum. The later three were derived to indicate the plant functional type (PFT) in each year and grid. They were expected to represent the temporal and spatial variations of PFT better than such product as BIOME4. So far as we were aware, all data-driven upscaling products used MODIS. We extracted LAI and FAPAR from the Copernicus Global Land Service; and T, RH and DSR from ERA5 of the European Centre for Medium-Range Weather Forecasts. This product using a different approach is expected to provide new information for studying global GPP, NEE, and RECO.

Description

Creator
Release date
2020/02/22
Temporal coverage
1999 - 2019
Data provider
NIES
Email: cgerdb_admin(at)nies.go.jp
DOI
File format
Data volume
42.6 GiB
Version
ver.2020.1 (Last updated: 2020/03/11)
Language
English

Data Set

Parameters
GPP, NEE and RECO
Domain
Global
Time resolution
10 day
Spatial resolution
0.1 x 0.1 degree
Calculation method
Upscaling of site observations using Random Forest
Keywords
[GCMD_Platform]
Earth Observation Satellites > SPOT > SPOT-4
[GCMD_Science]
BIOSPHERE > TERRESTRIAL ECOSYSTEMS
[Free keywords]
GPP, NEE, RECO, FLUXNET, Machine Learning, Random Forest, ECMWF ERA5
Update history
[2020/03/11]
In ver.2020.1, latitude and longitude were renamed according to COARDS NetCDF Conventions.
[2020/02/22]
Data from 1999 to 2019 are released. ver.2020.

Terms and Conditions of Use*

*By accessing or using the Service you agree to follow these Terms. If you disagree with any part of the Terms, you may not access the Service.

License
Citation format
When this data set is referred to in publications, it should be cited in the following format.
Zeng, J (2020), A Data-driven Upscale Product of Global Gross Primary Production, Net Ecosystem Exchange and Ecosystem Respiration, ver.xxxx *1, Center for Global Environmental Research, NIES, DOI:10.17595/20200227.001, (Reference date*2: YYYY/MM/DD)
*1 The version number is indicated in the name of each data file.
*2 As the reference date, please indicate the date you downloaded the files.

Advisory Service

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