Large loss of total ozone during the Arctic winter of 1999/2000

Sinnhuber, Björn-Martin; Chipperfield, Martyn P.; Davies, S.; Burrows, J. P.; Eichmann, Kai‐Uwe; Weber, Mark; Gathen, Peter von der; Guirlet, M.; Cahill, G. A.; Lee, A. M.; Pyle, J. A.

doi:10.1029/2000gl011772

Cited by 79 publications

(93 citation statements)

References 18 publications

(3 reference statements)

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“…Previous studies with SLIMCAT have shown a good agreement between the model and the observed large depletion in the lower stratosphere in this cold winter (Sinnhuber et al, 2000). These older runs used the purely θ -coordinate model and were forced by UKMO analyses.…”

Section: Winter 1999/2000: Comparison With Ozone Sondesmentioning

confidence: 99%

Three-dimensional model study of the Arctic ozone loss in 2002/2003 and comparison with 1999/2000 and 2003/2004

et al. 2005

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The updated CTM uses σ -θ as a vertical coordinate which allows it to extend down to the surface. The CTM has a detailed stratospheric chemistry scheme and now includes a simple NAT-based denitrification scheme in the stratosphere.In the model runs presented here the model was forced by ECMWF ERA40 and operational analyses. The model used 24 levels extending from the surface to ∼55 km and a horizontal resolution of either 7.5 • ×7.5 • or 2.8 • ×2.8 • . Two different radiation schemes, MIDRAD and the CCM scheme, were used to diagnose the vertical motion in the stratosphere. Based on tracer observations from balloons and aircraft, the more sophisticated CCM scheme gives a better representation of the vertical transport in this model which includes the troposphere. The higher resolution model generally produces larger chemical O 3 depletion, which agrees better with observations.The CTM results show that very early chemical ozone loss

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Section: Winter 1999/2000: Comparison With Ozone Sondesmentioning

confidence: 99%

Three-dimensional model study of the Arctic ozone loss in 2002/2003 and comparison with 1999/2000 and 2003/2004

et al. 2005

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“…All runs presented here are initialized on the 9 December 1999 and carried forward to June 2000 and output is taken at 15 min intervals. Comparisons of the ozone mixing ratios in SLIMCAT with measurements show good agreement in the 1999/2000 winter (Sinnhuber et al, 2000).…”

Section: Instruments and Modelmentioning

confidence: 71%

“…The polar low stratosphere was consistently cold, with more widespread temperatures below the PSC threshold than any other winter in the last 20 years and the largest ever local loss reported for the Arctic (Sinnhuber et al, 2000;Rex et al, 2002). Extensive denitrification occurred in the polar vortex (Fahey et al, 2001;Carslaw et al, 2002) and as a result, ozone losses were large during the winter and continued during the final warming in mid-March (when temperatures had risen above the PSC threshold) due to the hindered reconversion of ClO x to ClONO 2 (Sinnhuber et al, 2000). The vortex itself was stable until the final warming when it broke up with one substantial remnant present until April (Waugh and Rong, 2002).…”

Section: Introductionmentioning

confidence: 99%

Investigation of Arctic ozone depletion sampled over midlatitudes during the Egrett campaign of spring/summer 2000

et al. 2004

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Abstract.A unique halocarbon dataset has been obtained using the Australian high altitude research aircraft, the Grob G520T Egrett, during May-June 2000 with GC instrument (DIRAC), which has been previously deployed on balloon platforms. The halocarbon data generally shows a good anticorrelation with ozone data obtained simultaneously from commercial sensors. On 5 June 2000, at 380 K, the Egrett entered a high latitude tongue of air over the U.K. CFC-11 and O 3 data obtained on the flight show evidence of this feature. The dataset has been used, in conjunction with a 3D chemical transport model, to infer ozone depletion encountered in the midlatitude lower stratosphere during the flight. We calculate that ozone is depleted by 20% relative to its winter value in the higher latitude airmass. A suite of ozone loss tracers in the model have been used to track ozone depletion according to location relative to the vortex and chemical cycle responsible. The model, initialised on 9 December, indicates that 50% of the total chemical ozone destruction encountered in June in the middle latitudes occurred in the 90-70 • N equivalent latitude band and that 70% was due to halogen chemistry.

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“…A SLIMCAT calculation was performed for this winter (1999/2000) and the ozone evolution agreed well with data (Sinnhuber et al, 2000). To investigate ozone change based on SLIMCAT, we calculated ozone loss in several ways.…”

Section: Estimated Ozone Loss In the Vortexmentioning

confidence: 99%

Ozone loss derived from balloon-borne tracer measurements in the 1999/2000 Arctic winter

et al. 2005

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Abstract. Balloon-borne measurements of CFC11 (from the DIRAC in situ gas chromatograph and the DESCARTES grab sampler), ClO and O 3 were made during the 1999/2000 Arctic winter as part of the SOLVE-THESEO 2000 campaign, based in Kiruna (Sweden). Here we present the CFC-11 data from nine flights and compare them first with data from other instruments which flew during the campaign and then with the vertical distributions calculated by the SLIM-CAT 3D CTM. We calculate ozone loss inside the Arctic vortex between late January and early March using the relation between CFC11 and O 3 measured on the flights. The peak ozone loss (∼1200 ppbv) occurs in the 440-470 K region in early March in reasonable agreement with other published empirical estimates. There is also a good agreement between ozone losses derived from three balloon tracer data sets used here. The magnitude and vertical distribution of the loss derived from the measurements is in good agreement with the loss calculated from SLIMCAT over Kiruna for the same days.

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Large loss of total ozone during the Arctic winter of 1999/2000

Cited by 79 publications

References 18 publications

Three-dimensional model study of the Arctic ozone loss in 2002/2003 and comparison with 1999/2000 and 2003/2004

Three-dimensional model study of the Arctic ozone loss in 2002/2003 and comparison with 1999/2000 and 2003/2004

Investigation of Arctic ozone depletion sampled over midlatitudes during the Egrett campaign of spring/summer 2000

Ozone loss derived from balloon-borne tracer measurements in the 1999/2000 Arctic winter

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