D-QS_I.3.1 | First data delivery of Data-driven NEE prior estimates from data-driven statistical upscaling

Project Details

Jira Deliverable

https://itmsgermany.atlassian.net/browse/IQS-24

Summary

NEE prior estimates from data-driven statistical upscaling

Project Module

ITMS-Q&S

Parent/Workpackage

WP-QS_I.3 | Biogenic CO2 fluxes

https://itmsgermany.atlassian.net/browse/IQS-24

Team

MPI-BGC

Funder/Grant Number

BMBF / 01LK2105D

Originator/Data Creator

Sophia Walther, Jacob Nelson, Martin Jung, Fluxcom-X team

Data Contact Person

For questions, please contact Sophia Walther, sophia.walther@bgc-jena.mpg.de

Description

This dataset contains estimates of the terrestrial biogenic CO2 exchange between the land surface and the atmosphere, called Net Ecosystem Exchange (NEE). NEE is defined negative when more CO2 is taken from the atmosphere into the land surface than the other way around. The NEE estimates serve as prior estimates in the atmospheric inversions in ITMS module M.

The NEE estimates here are based on a statistical upscaling approach that marries eddy-covariance measurements of in-situ NEE with satellite observations of properties of the land surface via machine learning. The data originate from the so-called X-BASE product version from the modelling framework FluxCom-X (Nelson* & Walther* et al. 2024 Biogeosciences Discussions, submitted). Satellite observations from the MODIS instruments provided in ITMS B deliverable 1.7.1 drive the simulations. The data are provided in netcdf format in separate files for each year between 2001 and 2021 for every hour and in 0.05deg resolution for the European domain (33.82- 70.18N, -21.3- 59.32E, according to agreements here). NEE is given in units of mumolCO2 m-2 s-1.

Future efforts will customize these simulations in various aspects, e.g. regarding the training domain, predictor variables, and Earth observations, as well as possible coordination with complementary process-based simulations by KIT.

Purpose of dataset

• Prior for atmospheric inverse modelling in the module M according to the Internal User Requirements https://itmsgermany.atlassian.net/wiki/spaces/IT/pages/132579329/D-K.5.3+Synthesis+Report+Internal+User+Requirements+Part+2+11-2023#2.3-Biogenic-CO2-fluxes-(WP-QS_I.3)

• Used for comparison by ITMS QS_I WP4

Input Data

MODIS land surface satellite observations (ITMS-B deliverable I.7.1), MODIS observations of the same variables at eddy-covariance stations, biogenic NEE and meteorological observations at global eddy-covariance stations

Important Notes

none

Metadata

Data Type

gridded emission data of CO₂ for Europe

Data Parts

• A dataset containing Europe from 2001 - 2021 (NEE_Europe_XBASE_deliverableI_3_1_20**.nc)

• A dataset containing a cut out of Germany from 2017 - 2021 for comparisons with QS_I WP4 (NEE_Germany_XBASE_20**.nc)

• A test dataset ~430 MB (NEE_Germany_XBASE_2021growingSeason_smalltestfile_.nc)

Data Format

netcdf

Data Size

780 GB, in yearly files a 39GB

Planned Update Cycles:

yearly

Data Version

v0

Data delivery date

31.01.2024

Data last modification date

31.01.2024

Data license

openData

Data Access

Data location (URL)

The data sets are for now made available via FTP under ftp://ftp.bgc-jena.mpg.de/pub/outgoing/swalth/ITMS/ITMS_QS/deliverable_I31_2024_01. Parts of the folders may be hidden. Make sure to give the path explicitly.

Literature Reference

Nelson*&Walther* et al. 2024 (Biogeosciences Diss, submitted)

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