Retrieval of tropospheric Carbon Monoxide from MIPAS measurements
Claudio Belotti(1), Bruno Carli(1), Simone Ceccherini(1), Samuele Del Bianco(1) and Piera Raspollini(1)
(1) IFAC CNR, Via Madonna del Piano, 10, 50019 Sesto F.no (Fi), Italy
The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS), is operating on Envisat since March 2002, measuring high-resolution atmospheric limb emission spectra in the interval from 685 to 2410 cm^-1 with a resolution of 0.025 cm^-1. For each orbit MIPAS performs 75 limb scans, each made of 17 spectra, 14 orbits per day.
In order to manage this amount of data MIPAS/Envisat Payload Data Segment Level-2 analysis is focused on the retrieval of profiles of pressure, temperature and volume mixing ratio of six target species (H2O, O3, HNO3, CH4, N2O and NO2). Nevertheless, spectra contain signatures of various other species. In particular at IFAC the Optimised Retrieval Model code (ORM) has been used to perform the retrieval of profiles of CFC-11, CFC-12, ClONO2 , N2O5 and CO.
In this paper we present the results of CO profile retrieval and on CO monthly concentration mean maps.
Carbon monoxide is particularly interesting in the troposphere, where it is a signature of biomass burning and industrial activities. MIPAS CO measurements in the troposphere are made difficult by the overburden due to the high concentration in the stratosphere. Moreover CO spectral signatures lay in MIPAS Band D where the lowest SNR is observed. In order to reduce the uncertainties due to these causes, a dedicated retrieval framework has been developed around ORM to exploit the huge amount of MIPAS data and produce time and space averages of this species.
Keywords: ESA European
Space Agency - Agence spatiale europeenne,
observation de la terre, earth observation,
satellite remote sensing,
teledetection, geophysique, altimetrie, radar,
chimique atmospherique, geophysics, altimetry, radar,