Subseasonal variability of water vapor in the upper stratosphere/lower mesosphere over Northern Europe in winter 2009/2010

摘要: Abstract For the upper stratosphere and lower mesosphere (USLM) we used microwave spectrometer measurements of water vapor to investigate cause subseasonal variability over Northern Europe: at ALOMAR (Andenes, 69.3° N, 16.1° E), Norway, Leibniz Institute Atmospheric Physics (Kuhlungsborn, 54.2° 11.8° Germany, for winter 2009/2010. The MERRA data set NASA is applied study dynamical link between local H2O transport in USLM. Besides a slow increase January stronger decrease February March 2010, episodes significant were found Germany. These structural changes are good agreement with which show similar patterns induced by dominant conservative horizontal H2O. Due strong negative meridional gradient mixing barrier, higher values have been observed outside polar vortex inside. We that complex evolution Germany during minor stratospheric sudden warming (mSSW) beginning December 2009 major (MSSW) end as well two, fits into this relationship. An episode about 55–60 km altitude was MSSW on 27th 2010 resulting double peak altitude. Based dual caused relatively regional northward propagation more moist air mesosphere. In intrusion warm occurred mainly Europe well-mixed anticyclone 30th January. comparison observations maxima underestimated approximately 1–2 ppmv. After MSSW, vertical descent rate reanalysis half much one Kuhlungsborn. Nevertheless high coherence Norway supports extended use studies conclude USLM Europe, especially Kuhlungsborn ALOMAR, 2009/2010 passage edge linked