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Ozone depletion in and below the Arctic Vortex for 1997
Author(s) -
Knudsen B. M.,
Larsen N.,
Mikkelsen I. S.,
Morcrette J.J.,
Braathen G. O.,
Kyrö E.,
Fast H.,
Gernandt H.,
Kanzawa H.,
Nakane H.,
Dorokhov V.,
Yushkov V.,
Hansen G.,
Gil M.,
Shearman R. J.
Publication year - 1998
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/98gl00300
Subject(s) - ozone depletion , diabatic , vortex , ozone , polar vortex , atmospheric sciences , stratosphere , arctic , chemical transport model , environmental science , ozone layer , climatology , meteorology , geology , physics , oceanography , thermodynamics , adiabatic process
The winter 1996/97 was quite unusual with late vortex formation and polar stratospheric cloud (PSC) development and subsequent record low temperatures in March. Ozone depletion in the Arctic vortex is determined using ozonesondes. The diabatic cooling is calculated with PV‐theta mapped ozone mixing ratios and the large ozone depletions, especially at the center of the vortex where most PSC existence was predicted, enhances the diabatic cooling by up to 80%. The average vortex chemical ozone depletion from January 6 to April 6 is 33, 46, 46, 43, 35, 33, 32 and 21 % in air masses ending at 375, 400, 425, 450, 475, 500, 525, and 550 K (about 14–22 km). This depletion is corrected for transport of ozone across the vortex edge calculated with reverse domain‐filling trajectories. 375 K is in fact below the vortex, but the calculation method is applicable at this level with small changes. The column integrated chemical ozone depletion amounts to about 92 DU (21%), which is comparable to the depletions observed during the previous four winters.