VALIDATION OF GOMOS H2O DATA PRODUCT WITH BALLOONBORNE LASER AND FROST-POINT HYGROMETERS.

• Main Authors: Georges Durry, Joelle Ovarlez, Ivan Pouchet
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Kiruna
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.212.1990; http://envisat.esa.int/pub/ESA_DOC/envisat_val_1202/proceedings/ACV/balloon/06_durry.pdf

A laser diode sensor (SDLA) and a frost-point hygrometer (ELHYSA) have been combined to provide water vapor, methane, carbon dioxide and aerosols measurements in the UT-LS from stratospheric balloons. The main objective consists of validating the H2O data yielded by the GOMOS instrument. The instruments were flown several times at mid- and northern latitudes and we report the achieved measurements. At this step, the GOMOS water vapor data are not yet available to permit a valuable comparison as the improvement of the H2O retrieval algorithm is under way; the GOMOS data corresponding to the flights are to be processed further. Instead of comparing data, what will be carried out later during the validation campaign, we propose to discuss future balloon activities related to ENVISAT. We have proposed a balloon campaign from Aire sur Adour (43°N) on October 2003 (or on May 2004) to study subtropical intrusions and its impact on stratospheric O3 and H2O using in situ data (SDLA, ELHYSA, ionic anemometers …), satellite measurements (GOMOS, …) and highresolution advection and trajectory models. 1. INSTRUMENTATION The SDLA spectrometer is a balloon borne diode laser spectrometer devoted to the in situ measurement of H2O, CH4 and CO2 in the UT-LS [1]. Fig.1 is a picture of the SDLA during its flight from Kiruna within the