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WP 5.1: Evaluation of forward models with GEOmon data

Objectives

• Systematic model evaluation in almost near-real time and assessment of the dataflow using GEOmon data
  (for greenhouse gases)
• Demonstrate the usefulness of the GEOmon data for the validation of global and regional models in order to improve the representation of processes (for reactive species and aerosols)

GEOmon observations from each of the observational activities (tropospheric reactive gases, aerosols, greenhouse gases, and stratospheric chemistry) are used to validate models of different types of applications. For this purpose, at least 1 pilot study has been defined for each application that demonstrates the respective observations. The pilot studies have been designed such that they answer current scientific questions, and these answers can only be obtained by combining specific models with the observations.

GEOmon modelling pilot studies

Topic	Models	Data	Science Objective
Greenhouse gases	TM5, UiO CTM LMDzT-INCA 1997-2005 (depending on species)	CH4, CO2, and CO from CARIBIC CH4 and CO at surface stations climatology from ~45 aircraft campaigns	Evaluate simulated large and interhemispheric gradients at the UTLS and the surface.
Reactive gases	LMDzT-INCA, TM5, UiO CTM global 2005-2007	CARIBIC: O3, HCHO, CH3COCH3, (CH3OH, )NOy GOME: HCHO	Assessment of oxygenated species at the UTLS that determine the radical budget at these heights.
Air quality	CHIMERE (EU25) LOTOS/ EUROS (global models) 2000-2007	O3 and NO2 from GEOmon, EMEP, Airbase	Improvement of the evaluation of simulated air polution using information on the spatial representativeness of the obserational sites.
Aerosols	LMDzT-INCA (TM5) Europe 2006-2007	Data from ICARE, EUSAAR, PHOTONS, EARLINET, MODIS, POLDER/PARASOL,CALIOP: surface extinction, profile extinction, optical depth, chemical composition	Develop transfer standards to combine measurements of different types, locations, and scales. Interpretation of satellite observations for air quality.
Stratospheric chemistry	SLIMCAT LMDZ-Reprobus global 1980-now	Stratospheric reactive aerosols and gases: Groundbased column data from NDACC sites: NO2, BrO, HCl, ClONO2, HF. Profile data at selected GEOmon stations: HCl, ClONO2, HF, O3	Evaluated long-term (1980-now) )stratospheric trends focusing on NO2 and halogen species. Understand the underlying processes of the observed trends. Assess model proviles over a selected annual cycle.

A detailed description of the pilot studies is available on the GEOmon intranet (for partners only, sorry).

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