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- W2104923942 abstract "Investigations of the kinematics of the lower stratospheric Arctic vortex during the winter of 1991–1992 using the contour advection with surgery technique reveal three distinct events in which there was substantial intrusion of midlatitude air into the vortex, in apparent contradiction of the view that the polar vortex constitutes an isolated air mass. Two of these events, in late January and mid‐February, were well documented. They were predicted in high‐resolution forecasts by the European Centre for Medium‐Range Weather Forecasts, most clearly in experimental forecasts with reduced diffusion. Direct confirmation of the presence of the intrusions and of their calculated locations was provided by aerosol observations from the airborne differential absorption laser lidar aboard the NASA DC‐8, taken as part of the second Airborne Arctic Stratospheric Expedition campaign; aerosol‐rich air of midlatitude origin was seen in the expected position of the intrusions. The reality of the February event was also confirmed by in situ measurements from the NASA ER‐2. Such events may be significant for the chemical processes taking place within the winter vortex. The intrusions were evidently related to the meteorology of the northern stratosphereduring this winter and in particular to persistent tropospheric blocking over the northeastern Atlantic Ocean and western Europe and concomitant ridging into the lower stratospheric vortex in this region. Nevertheless, preliminary investigations have indicated that such events are not uncommon in other northern hemisphere winters, although no such events were found in the southern hemisphere during the Antarctic winter of 1987." @default.
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- W2104923942 date "1994-01-20" @default.
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- W2104923942 title "Intrusions into the lower stratospheric Arctic vortex during the winter of 1991–1992" @default.
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- W2104923942 doi "https://doi.org/10.1029/93jd02557" @default.
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