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Multi axis hyper spectral measurements of tropospheric compounds with ground based and satellite equipments

Ana Domingues(1), Daniele Bortoli(1), Ana Maria Silva(2) and Manuel Ramirez(1)

(1) Geophysics Centre of Evora, Rua Romao Ramalho 59, 7000 Evora, Portugal
(2) Geophysics Centre of Evora, University of Evora, Rua Romao Ramalho 59, 7000 Evora, Portugal

Abstract

The multi purpose UV-Vis. Spectrometer for Atmospheric Tracers Measurement (SPATRAM) is installed at the Observatory of the Geophysics Centre of Evora (38.5º N, 7.9º W) – Portugal, since 2004, measuring the zenith scattered radiation in the 300-550 nm spectral range. The main products are the total column and the vertical profiles of NO2 and O3 obtained with the application of the Differential Optical Absorption Spectroscopy (DOAS) algorithms and with inversion schemes based on the Optimal Estimation methods respectively. In February 2009, the MIGE (Multiple Input Geometry Equipment) was coupled to the SPATRAM allowing for the measure of the diffused radiation in directions away from the zenith one. MIGE is an alt-azimuth platform based on a very simple optical layout, using an optic fibre to transmit the radiation inside the monochromator of SPATRAM. Thanks to the solution adopted in the developing phase, the Platform is able to scan the total sky. In this work, after a brief description of the MIGE, the preliminary results for the observations, in terms of high resulted vertical profiles of NO2, O3, SO2 and HCHO in the Planetary Boundary Layer (PBL) in Evora, are presented and discussed. The comparison between the columns obtained with the SPATRAM-MIGE system in the PBL and the tropospheric contents measured with satellite-borne instruments (SCIAMACHY and OMI) give high correlation coefficients. This last result represents the undoubted evidence of the trustworthiness of the ground based measurements and the possibility for the Evora station to be included in the network for the validation of the satellite data.