Accueil > Actualités > Séminaires > Séminaire de I. PISSO et al.


Titre : Constraints on CO2 flux emissions: reconstructions of in-situ measurements from Lagrangian stochastic inversion
Nom du conférencier : I. PISSO et al.
Son affiliation : I. Pisso (1), P. Patra (1), M. Takigawa (1), T. Nakazawa (2) , Y. Sawa (3), T. Machida (4) and H. Matsueda (3) (1) RIGC, JAMSTEC, Japan (2) Tohoku University, Sendai, Japan (3) MRI, Tsukuba, Japan (4) NIES Tsukuba, Japan
Laboratoire organisateur : LMD
Date et heure : 21-04-2011 14h30
Lieu : LMD-ENS, 24 rue Lhomond, 75005 Paris - Salle E314 du Dept des Geosciences
Résumé :

In order to use high resolution in-situ measurements to constrain regional emissions of carbon dioxide (CO2) we use a Lagrangian methodology based on diffusive backward trajectory tracer reconstructions. We use aircraft, ground and tower sites for CO2 data, collected during the CONTRAIL campaign, from the MRI/JMA Tsukuba tall tower, nearby the CO2 emission hot spot of the Tokyo Bay area and from the World Data Centre for Greenhouse Gases (WDCGG). Advective transport based on ECMWF analyzed meteorological winds and the WRF mesoscale model is characterized by the sensitivity/transition probability (Green's function) allowing direct comparison with observations via the reconstruction of the volume mixing ratio of CO2. Sensitivity to simplified boundary layer representations, turbulent mixing representations and meteorological fields was studied and applied to the assessment of publicly available inventory
data. Longer time series in remote sites (e.g. the Yonagunijima island) are used to constrain the influence of far field/continental East Asia emissions. Estimated fluxes for the Tokyo Bay Area for the analyzed period in 2007 range between 4.8*10-7 to 3.45*10-6 kgCO2 /m^2s with
significant time variations. We assess the uncertainties in terms of errors associated with the transport and mixing processes in the vicinity of the emission sources.

Contact :

Riwal Plougonven, LMD