The northern hemisphere stratospheric vortex during the 2002–03 winter: Subsidence, chlorine activation and ozone loss observed by the Odin Sub‐Millimetre Radiometer

Urbán, J.; Lautie, Nicolas; Flochmoën, É. Le; Murtagh, Donal; Ricaud, P.; Noë, J. de La; Dupuy, É.; Drouin, A.; Amraoui, L. El; Eriksson, Patrick; Frisk, U.; Jimenez, Chloé; Kyrölä, E.; Llewellyn, E. J.; Mégie, G.; Nordh, L.; Olberg, M.

doi:10.1029/2003gl019089

Cited by 30 publications

(37 citation statements)

References 12 publications

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“…A very early chlorine activation and ozone loss has been reported by Tilmes et al (2003) from the analysis of the HALOE (Halogen Experiment on UARS) data using the TRAC (ozone-tracer correlation) method, confirmed by the very low HCl mixing ratio measured at 520 K in the vortex by the MkIV balloon instrument flown over Northern Sweden on 16 December. The occurrence of early chlorine activation is also supported by the measurements of the ODIN SubMillimeter Radiometer (SMR) satellite instrument showing night-time ClO amounts of about 0.3-0.6 ppbv between 450 K and 525 K on 9-10 December (Urban et al, 2004), implying daytime amounts of the order of 1 ppbv. The event is also confirmed by the presence of high OClO levels observed in December by the UV-Visible spectrometer at Harestua in Southern Norway (Fig.…”

Section: Other Reportsmentioning

confidence: 70%

Early unusual ozone loss during the Arctic winter 2002/2003 compared to other winters

Goutail¹,

Pommereau²,

Lefèvre³

et al. 2005

Atmos. Chem. Phys.

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Abstract. Ozone loss during the winter 2002/2003 has been evaluated from comparisons between total ozone reported by the SAOZ network and simulated in passive mode by both REPROBUS and SLIMCAT. Despite the fact that the two models have a different approach to calculate the descent inside vortex, both evaluations provide similar results 18±4% using REPROBUS and 20±4% using SLIMCAT and show that the loss started around mid-December, at least ten to twenty days earlier than during any of the previous eleven winters, except 1993/1994. This unusual behaviour is consistent with the low temperatures reported in the stratosphere as well to the signature of early chlorine activation indicated by ground-based, balloon and satellite observations. A significant ozone loss is also simulated by the current versions of two models, but of lesser amplitude compared to SAOZ, 13±2% for REPROBUS and 16±2% for SLIMCAT, the underestimation being already observed by mid-January. The early ozone depletion captured by both model show that chemical depletion did indeed take place in December, predominantly at the illuminated edge of the distorted vortex, but the reason for the underestimation compared to the observations and the differences among the models have still to be investigated.

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Section: Other Reportsmentioning

confidence: 70%

Early unusual ozone loss during the Arctic winter 2002/2003 compared to other winters

Goutail¹,

Pommereau²,

Lefèvre³

et al. 2005

Atmos. Chem. Phys.

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“…In the model study of the 2006/ 2007 winter we therefore use the strongest values in the range of estimates, namely 1.3 K per day between 475 K and 525 K and 1.5 K per day between 525 K and 575 K in January and the first 14 days of February. Since vortex descent rates have a tendency to increase with altitude [Rosenfield et al, 1994;Urban et al, 2004] we assume 1.7 K diabatic descent per day above 575 K. We furthermore assume that there was no vertical ascent in late February and March.…”

Section: Diamond Modelmentioning

confidence: 99%

Ozone depletion in the 2006/2007 Arctic winter

Rösevall

Murtagh

Urban

2007

Geophysical Research Letters

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Ozone depletion in the 2006/2007 Arctic winter is studied by assimilating ozone from the Odin/SMR satellite instrument into a 2‐D isentropic transport model. Cross‐isentropic transport is implemented by letting the vortex descend at a rate estimated from the inert tracer N2O. Ozone depletion is estimated by comparing ozone fields, passively transported in the model from 1 January 2007, to model fields continuously updated by assimilation of incoming satellite data. Significant ozone destruction is inferred in February and March 2007. By 15 March, an average ozone destruction in the range 0.5–1.0 ppmv is estimated north of 65° equivalent latitude at 475 K potential temperature, whilst 0.3–0.8 ppmv and 0.4–0.8 ppmv ozone destruction is estimated at 525 K and 575 K. By comparing the 2007 ozone depletion to losses inferred in 2003 and 2005 we conclude that the 2007 Arctic ozone destruction is the most severe found in the Odin/SMR data set.

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“…Key elements of SMR are a 1.1 m telescope and four tunable single-sideband Schottky-diode heterodyne receivers that passively measure the limb thermal emission in the spectral range of 486-581 GHz, as well as two high-resolution auto-correlator spectrometers Olberg et al, 2003). Usually measurements are performed in stratospheric mode twice a week, and atmospheric constituents such as O 3 , ClO, N 2 O, and HNO 3 are retrieved from limb observations in two frequency bands centred at 501.8 GHz and 544.6 GHz (Urban et al, 2004b.…”

Section: Odin Satellite Measurementsmentioning

confidence: 99%

Technical Note: Validation of Odin/SMR limb observations of ozone, comparisons with OSIRIS, POAM III, ground-based and balloon-borne instruments

et al. 2008

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Abstract. The Odin satellite carries two instruments capable of determining stratospheric ozone profiles by limb sounding: the Sub-Millimetre Radiometer (SMR) and the UVvisible spectrograph of the OSIRIS (Optical Spectrograph and InfraRed Imager System) instrument. A large number of ozone profiles measurements were performed during six years from November 2001 to present. This ozone dataset is here used to make quantitative comparisons with satellite measurements in order to assess the quality of the Odin/SMR ozone measurements. In a first step, we compare Swedish SMR retrievals version 2.1, French SMR ozone retrievals version 222 (both from the 501.8 GHz band), and the OSIRIS retrievals version 3.0, with the operational version 4.0 ozone product from POAM III (Polar Ozone Atmospheric Measurement). In a second step, we refine the Odin/SMR validation .1 dataset is consistent in all altitude ranges with POAM III, NDACC and large balloon-borne instruments measurements. In the SMR v2.1 data, no different systematic error has been found in the 0-35km range in comparison with the 35-60 km range. The same feature has been highlighted in both hemispheres in SMR v2.1/POAM III intercomparisons, and no latitudinal dependence has been revealed in SMR v2.1/NDACC intercomparisons.

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The northern hemisphere stratospheric vortex during the 2002–03 winter: Subsidence, chlorine activation and ozone loss observed by the Odin Sub‐Millimetre Radiometer

Cited by 30 publications

References 12 publications

Early unusual ozone loss during the Arctic winter 2002/2003 compared to other winters

Early unusual ozone loss during the Arctic winter 2002/2003 compared to other winters

Ozone depletion in the 2006/2007 Arctic winter

Technical Note: Validation of Odin/SMR limb observations of ozone, comparisons with OSIRIS, POAM III, ground-based and balloon-borne instruments

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