Since 1994 ASUR has been improved by using a Helium-cooled superconducting detector. Measurements of the chlorine species ClO and HCl have been taken nearly every winter. By evaluating the time series from 1995 to 2000 chlorine activation in the arctic winters over the past years will be studied. The investigations will be expanded by a series of campaigns in 2002/2003 spanning from the arctic to tropical latitudes. Particular attention will be payed to events clearly outside the polar vortex where the presence of activated chlorine is not yet fully understood.

From September 2002 to March 2003 the Airborne SUbmillimeter Radiometer ASUR will participate in four large field campaigns, with measurement locations reaching from the Arctic to the tropics. During these time periods the MIPAS-instrument on board the recently launched European satellite ENVISAT will take continuous measurements all over the globe. ASUR shares with MIPAS the operational data products Ozone, N₂O, and HNO₃, as well as some scientific products like NO, HCN, and H₂O. The aim of this study is to search and analyze colocated measurements of ASUR and MIPAS. The comparisons of these measurements will be used for validation purposes of the MIPAS-instrument. Sufficient time and interest provided, comparisons of ASUR data with data from the radiometer of the ODIN satellite can also be performed. The work will be done in close co-operation with the validation of the SCIAMACHY-instrument, which also operates on board ENVISAT.

Designer: 08/04/2002 Tianxun Ba
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