Department für Geographie





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Fachgebiet: Geländemessungen, Klimatologie, Modellierung

Projektleitung: M.Sc. Raphael Ganzenmüller, Prof. Dr. Julia Pongratz
Projektwissenschaftler: M.Sc. Raphael Ganzenmüller, Prof. Dr. Julia Pongratz

Laufzeit: 04/2018 - 08/2022

VERIFY develops a system to estimate greenhouse gas (GHG) emissions to support countries' emission reporting to the UN Climate Change Convention Secretariat. The emissions are estimated based on land, ocean and atmospheric observations. The project focuses on the three major greenhouse gases responsible for global warming: carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O).

VERIFY’s primary aim is to develop scientifically robust methods to assess the accuracy and potential biases in national inventories reported by the parties through an independent pre-operational framework.

The main concept is to provide observation-based estimates of anthropogenic and natural GHG emissions and sinks as well as associated uncertainties. The proposed approach is based on the integration of atmospheric measurements, improved emission inventories, ecosystem data, and satellite observations, and on an understanding of processes controlling GHG fluxes (ecosystem models, GHG emission models).

Two complementary approaches relying on observational data-streams will be combined in VERIFY to quantify GHG fluxes:

    1. Atmospheric GHG concentrations from satellites and ground-based networks (top-down atmospheric inversion models)

    2. Bottom-up activity data (e.g. fuel use and emission factors) and ecosystem measurements (bottom-up models)

    For CO2, a specific effort will be made to separate fossil fuel emissions from ecosystems fluxes. For CH4 and N2O, we will separate agricultural from fossil fuel and industrial emissions. Finally, trends in the budget of the three GHGs will be analysed in the context of countries' climate mitigation pledges.

    Our role in the project is the provision of high-resolution estimates from land use and land-use change (LULUC) generated by the bookkeeping model of land use emissions (BLUE). Within the project we are integrating new observational datasets from project partners and develop our own datasets to improve the accuracy of the BLUE model. Our estimates are used to identify key differences between bottom-up estimates from process-based and bookkeeping methods.

    Most recent Publication: Petrescu et al. (2020): The consolidated European synthesis of CO2 emissions and removals for EU27 and UK: 1990–2018. Earth System Science Data Discussions, 1-77 (

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