Ozone depletion in and below the Arctic Vortex for 1997

Knudsen, B. M.; Larsen, N.; Mikkelsen, I. S.; Morcrette, Jean‐Jacques; Braathen, Geir; Kyrö, E.; Fast, H.; Gernandt, Hartwig; Kanzawa, Hiroshi; Nakane, Hideaki; Dorokhov, V.; Yushkov, V. A.; Hansen, Georg; Gil, Manuel; Shearman, R. J.

doi:10.1029/98gl00300

Cited by 77 publications

(85 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the absence of mixing, correlations between a long-lived tracer and ozone provide a quantitative measure of chemical O 3 change [Müller et al, 2001[Müller et al, , 2005. TRAC has been successfully used to quantify chemical O 3 loss for the past decade of Arctic [Tilmes et al, 2004] Harris et al [2002] showed general agreement of TRAC-derived O 3 loss with O 3 loss derived from Lagrangian trajectory [Manney et al, 1995], vortex average [Knudsen et al, 1998], SAOZ [Goutail et al, 1999] and Match [von der Gathen et al, 1995] calculations.…”

Section: Data and Analysismentioning

confidence: 86%

Chemical ozone loss in a chemistry‐climate model from 1960 to 1999

Lemmen¹,

Dameris²,

Müller³

et al. 2006

Geophysical Research Letters

View full text Add to dashboard Cite

In the recent WMO assessment of ozone depletion, the minimum ozone column is used to assess the evolution of the polar ozone layer simulated in several chemistry‐climate models (CCMs). The ozone column may be strongly influenced by changes in transport and is therefore not well‐suited to identify changes in chemistry. The quantification of chemical ozone depletion can be achieved with tracer‐tracer correlations (TRAC). For forty Antarctic winters (1960–1999), we present the seasonal chemical depletion simulated with the ECHAM4.L39(DLR)/CHEM model. Analyzing methane–ozone correlations, we find a mean chemical ozone loss of 80 ± 10 DU during the 1990s, with a maximum of 94 DU. Compared to ozone loss deduced from HALOE measurements the model underestimates chemical loss by 37%. The average multidecadal trend in loss from 1960 to 1999 is 17 ± 3 DU per decade. The largest contribution to this trend comes from the 62 ± 11 DU ozone loss increase between the 1970s and 1990s.

show abstract

Section: Data and Analysismentioning

confidence: 86%

Chemical ozone loss in a chemistry‐climate model from 1960 to 1999

Lemmen¹,

Dameris²,

Müller³

et al. 2006

Geophysical Research Letters

View full text Add to dashboard Cite

show abstract

“…The effect of export of chemically activated air out of the vortex is also small, as seen from the following arguments: The exported air will only deplete the air outside the vortex for, say, 10 days. However, the air inside the vortex stays activated for about 60 days on average in the two winters studied here [Rex et al., 1999; Knudsen et al, 1998b]. Since the exported air constitutes less than about 50% of the vortex area, the exported air only has a depletion potential of less than about 1/12 of that of the vortex air.…”

Section: Mixingmentioning

confidence: 99%

Northern midlatitude stratospheric ozone dilution in spring modeled with simulated mixing

Knudsen¹,

Grooß²

2000

J. Geophys. Res.

View full text Add to dashboard Cite

Abstract. Measurements have shown a substantial decrease in Northern midlatitude ozone, which has only partially been explained by chemical models. The large ozone depletions determined for the Arctic vortex in recent winters will ultimately spread out and dilute the midlatitudes and thus contribute to the observed decrease. Here we have followed the ozone-depleted air inside the Arctic vortex in 1995 and 1997 during April and May with high-resolution reverse domain-filling (RDF) trajectory calculations. The resulting average midlatitude (30ø-60øN) stratospheric ozone dilution in May is 2.9% and 2.6% of the 1979 column ozone in 1995 and 1997, respectively, or about 40% of the observed depletion. Nearly realistic mixing was introduced by a regridding procedure between successive 7-day long RDF calculations. Low-resolution grid point models give too much mixing, causing an overestimate of the calculated dilution. A recovery of about 12% of the midlatitude dilution in May 1997 is calculated with a photochemical box model, but is not included in the number given above.

show abstract

“…Although there are certain assumptions involved in this method, it does give a correct depletion in the winter 1999/2000 (Lait et al, 2002;. It has been shown that mixing ideally should be taken into account at the bottom of the vortex and below (Knudsen et al, 1998) and in some years even above (Grooß and Müller, 2002). Rex et al (2004) found a high correlation between mean PSC volume and mean end-of-winter column ozone depletion.…”

Section: Correlation Between Psc Area and Ozone Depletionmentioning

confidence: 99%

Extrapolating future Arctic ozone losses

Knudsen

Harris²,

Andersen

et al. 2004

Atmos. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

Abstract. Future increases in the concentration of greenhouse gases and water vapour may cool the stratosphere further and increase the amount of polar stratospheric clouds (PSCs). Future Arctic PSC areas have been extrapolated from the highly significant trends 1958-2001. Using a tight correlation between PSC area and the total vortex ozone depletion and taking the decreasing amounts of ozone depleting substances into account we make empirical estimates of future ozone. The result is that Arctic ozone losses increase until 2010-2015 and decrease only slightly afterwards. However, for such a long extrapolation into the future caution is necessary. Tentatively taking the modelled decrease in the ozone trend in the future into account results in almost constant ozone depletions until 2020 and slight decreases afterwards. This approach is a complementary method of prediction to that based on the complex coupled chemistry-climate models (CCMs).

show abstract

Ozone depletion in and below the Arctic Vortex for 1997

Cited by 77 publications

References 15 publications

Chemical ozone loss in a chemistry‐climate model from 1960 to 1999

Chemical ozone loss in a chemistry‐climate model from 1960 to 1999

Northern midlatitude stratospheric ozone dilution in spring modeled with simulated mixing

Extrapolating future Arctic ozone losses

Contact Info

Product

Resources

About