Analysis of One-year Time Series of Atmospheric CO2 Concentration within Paris and its Vicinity
Abstract
Since 2010, a network of seven in-situ continuous CO2 monitoring stations has been established in the Greater Paris area in coordination with projects such as CO2-MegaParis and CarboCount-City, in part to improve existing bottom-up CO2 emissions inventories using atmospheric observations as a top-down constraint. In this study, we present the results from a set of 15-month simulations of the CO2 concentration over the Paris megacity based on several physical parameterizations of the WRF-Chem model driven by anthropogenic fossil fuel CO2 emissions from the AirParif inventory, and biogenic CO2 fluxes from the online VPRM model. The 1-km spatial resolution simulations are carried out over the period spanning September 2015 to December 2016. The simulated concentration values are compared with seven surface measurements of the CO2 concentrations from the network located within Paris and its vicinity, as well as integrated horizontal column observations along 30 chords ranging in length from 2.3 km to 5.2 km obtained from the GreenLITETM laser system deployed in the center of Paris covering an area of 25 km2 during this period of time. We analyze the impact of complex fine scale patterns in city emissions and the urban atmospheric meteorology on the spatial gradients and the temporal variations of CO2 concentrations. The model-measurement mismatches under different typical meteorological conditions are analyzed in order to identify errors in the anthropogenic emissions, the biogenic fluxes or the atmospheric transport.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.A52G..03L
- Keywords:
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- 0345 Pollution: urban and regional;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 3394 Instruments and techniques;
- ATMOSPHERIC PROCESSESDE: 0428 Carbon cycling;
- BIOGEOSCIENCESDE: 0478 Pollution: urban;
- regional and global;
- BIOGEOSCIENCES