Stratospheric water vapour in the vicinity of the Arctic polar vortex

摘要: Abstract. The stratospheric water vapour mixing ratio inside, outside, and at the edge of polar vortex has been accurately measured by FLASH-B Lyman-Alpha hygrometer during LAUTLOS campaign in Sodankyla, Finland, January February 2004. retrieved H2O profiles reveal a detailed view on Arctic lower distribution, provide valuable dataset for validation model satellite data. Analysing measurements with semi-lagrangian advection MIMOSA, typical vortex' interior exterior have identified, laminae observed correlated to filamentary structures potential vorticity field. Applying validated MIMOSA transport scheme specific humidity fields from operational ECMWF analyses, large discrepancies arise. Although is able reproduce weak filaments improves shape compared both models dry bias about 1 ppmv stratosphere above 400 K, accounting relative difference order 20%. analysis representation implies need future regular allow improvement climate models.