Explanations for simultaneous laminae in water vapor and aerosol profiles found during the SESAME experiment

H. Teitelbaum, C. Basdevant, M. Moustaoui

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

An instrumented balloon launched from Kiruna during the SESAME experiment displayed simultaneous local decreases of water vapor and aerosol at 2 different potential temperature levels 410 K and 364 K. Despite the similar characteristics present at both levels, 2 different explanations are given for these laminae. At the highest level, the air mass showing the water vapor and aerosol decrease is found when the balloon travels in the vortex edge region. A back trajectory shows that this air mass was trapped in the vortex edge region for several days and processed by a PSC causing the water vapor and aerosol decreases. On the other hand, the lowest level air mass was found to be in the sub-vortex region. No local conditions can explain the observed decreases of water vapor and aerosol. Back trajectory show that this air mass originates from middle latitudes. Although the back trajectories calculated in these conditions are more subject to caution, comparison of several characteristics at the measurement point and at the middle latitude sites corroborates the explanation of the decrease of water vapor and aerosol by the origin of the air mass.

Original languageEnglish (US)
Pages (from-to)190-202
Number of pages13
JournalTellus, Series A: Dynamic Meteorology and Oceanography
Volume52
Issue number2
DOIs
StatePublished - Mar 2000

ASJC Scopus subject areas

  • Oceanography
  • Atmospheric Science

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