Arctic ozone loss in threshold conditions: Match observations in 1997/1998 and 1998/1999

Επιστημονική δημοσίευση - Άρθρο Περιοδικού uoadl:3018295 92 Αναγνώσεις

Μονάδα:
Ερευνητικό υλικό ΕΚΠΑ
Τίτλος:
Arctic ozone loss in threshold conditions: Match observations in 1997/1998 and 1998/1999
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
Chemical ozone loss rates inside the Arctic polar vortex were determined in early 1998 and early 1999 by using the Match technique based on coordinated ozonesonde measurements. These two winters provide the only opportunities in recent years to investigate chemical ozone loss in a warm Arctic vortex under threshold conditions, i.e., where the preconditions for chlorine activation, and hence ozone destruction, only occurred occasionally. In 1998, results were obtained in January and February between 410 and 520 K. The overall ozone loss was observed to be largely insignificant, with the exception of late February, when those air parcels exposed to temperatures below 195 K were affected by chemical ozone loss. In 1999, results are confined to the 475 K isentropic level, where no significant ozone loss was observed. Average temperatures were some 8° - 10° higher than those in 1995, 1996, and 1997, when substantial chemical ozone loss occurred. The results underline the strong dependence of the chemical ozone loss on the stratospheric temperatures. This study shows that enhanced chlorine alone does not provide a sufficient condition for ozone loss. The evolution of stratospheric temperatures over the next decade will be the determining factor for the amount of wintertime chemical ozone loss in the Arctic stratosphere. Copyright 2001 by the American Geophysical Union.
Έτος δημοσίευσης:
2001
Συγγραφείς:
Schulz, A.
Rex, M.
Harris, N.R.P.
Braathen, G.O.
Reimer, E.
Alfier, R.
Kilbane-Dawe, I.
Eckermann, S.
Allaart, M.
Alpers, M.
Bojkov, B.
Cisneros, J.
Claude, H.
Cuevas, E.
Davies, J.
De Backer, H.
Dier, H.
Dorokhov, V.
Fast, H.
Godin, S.
Johnson, B.
Kois, B.
Kondo, Y.
Kosmidis, E.
Kyrö, E.
Litynska, Z.
Mikkelsen, I.S.
Molyneux, M.J.
Murphy, G.
Nagai, T.
Nakane, H.
O'Connor, F.
Parrondo, C.
Schmidlin, F.J.
Skrivankova, P.
Varotsos, C.
Vialle, C.
Viatte, P.
Yushkov, V.
Zerefos, C.
Von Der Gathen, P.
Περιοδικό:
Journal of Geophysical Research - Atmospheres
Εκδότης:
Wiley-Blackwell Publishing Ltd
Τόμος:
106
Αριθμός / τεύχος:
D7
Σελίδες:
7495-7503
Λέξεις-κλειδιά:
air temperature; arctic environment; ozone depletion; ozonesonde; stratosphere, Arctic
Επίσημο URL (Εκδότης):
DOI:
10.1029/2000JD900653
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