Satellite Observations of Trace Gas Enhancements in January 2005
Claire Waymark(1), Anu Dudhia(2), Chiara Piccolo(3) and Alastair Burgess(3)
(1) University of Oxford, Clarendon Laboratory, Oxford, OX1 3PU, United Kingdom
(2) University of Oxford, Clarendon Laboratory, Oxford,OX1 3PU, United Kingdom
(3) University of Oxford, Clarendon Laboratory, Oxford, OX1 3PU, United Kingdom
The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) is an infrared Fourier transform spectrometer on ESA's ENVISAT satellite, launched in March 2002. The originally spectral resolution of MIPAS was 0.025cm-1 but since August 2004 MIPAS has been operating at a reduced resolution of 0.0625cm-1.
An optimal estimation retrieval code (the MIPAS Orbital Retrieval using Sequential Estimation (MORSE)) was used to retrieve volume mixing ratios (VMR) profiles for key atmospheric species from the new low resolution ESA level 1B MIPAS data. Enhancements in certain trace gases such as Nitric acid (HNO3) and NO2 were seen in retrievals for January 2005. Other spacecraft and ground based instruments observed a Solar Proton Event (SPE) during the same period and similar enhancements were observed during a SPE in October/November 2003. It is therefore believed that these enhancements are caused by the influx of high-energy protons in the polar regions due to a large SPE.
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,