Ozone depletion in the 2006/2007 Arctic winter

Rösevall, John; Murtagh, Donal; Urban, Joachim

doi:10.1029/2007gl030620

Cited by 26 publications

(35 citation statements)

References 11 publications

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“…Between December 2006 and February 2007 a double-peaked maximum at 44 • N is seen in AIRS highresolution retrieval and HIRDLS. The second peak in both data sets could be related to a strong warming in the beginning of January 2007 (Rösevall et al, 2007). The enlarged peak in the HIRDLS data is mainly caused by short-verticaland long-horizontal-wavelength waves that are not visible for AIRS.…”

Section: Time Series Of Gravity Wave Variancesmentioning

confidence: 99%

Intercomparison of AIRS and HIRDLS stratospheric gravity wave observations

Meyer¹,

Ern²,

Hoffmann³

et al. 2018

Atmos. Meas. Tech.

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Abstract. We investigate stratospheric gravity wave observations by the Atmospheric InfraRed Sounder (AIRS) aboard NASA's Aqua satellite and the High Resolution Dynamics Limb Sounder (HIRDLS) aboard NASA's Aura satellite. AIRS operational temperature retrievals are typically not used for studies of gravity waves, because their vertical and horizontal resolution is rather limited. This study uses data of a high-resolution retrieval which provides stratospheric temperature profiles for each individual satellite footprint. Therefore the horizontal sampling of the high-resolution retrieval is 9 times better than that of the operational retrieval. HIRDLS provides 2-D spectral information of observed gravity waves in terms of along-track and vertical wavelengths. AIRS as a nadir sounder is more sensitive to short-horizontal-wavelength gravity waves, and HIRDLS as a limb sounder is more sensitive to short-vertical-wavelength gravity waves. Therefore HIRDLS is ideally suited to complement AIRS observations. A calculated momentum flux factor indicates that the waves seen by AIRS contribute significantly to momentum flux, even if the AIRS temperature variance may be small compared to HIRDLS. The stratospheric wave structures observed by AIRS and HIRDLS often agree very well. Case studies of a mountain wave event and a non-orographic wave event demonstrate that the observed phase structures of AIRS and HIRDLS are also similar. AIRS has a coarser vertical resolution, which results in an attenuation of the amplitude and coarser vertical wavelengths than for HIRDLS. However, AIRS has a much higher horizontal resolution, and the propagation direction of the waves can be clearly identified in geographical maps. The horizontal orientation of the phase fronts can be deduced from AIRS 3-D temperature fields. This is a restricting factor for gravity wave analyses of limb measurements. Additionally, temperature variances with respect to stratospheric gravity wave activity are compared on a statistical basis. The complete HIRDLS measurement period from January 2005 to March 2008 is covered. The seasonal and latitudinal distributions of gravity wave activity as observed by AIRS and HIRDLS agree well. A strong annual cycle at mid-and high latitudes is found in time series of gravity wave variances at 42 km, which has its maxima during wintertime and its minima during summertime. The variability is largest during austral wintertime at 60 • S. Variations in the zonal winds at 2.5 hPa are associated with large variability in gravity wave variances. Altogether, gravity wave variances of AIRS and HIRDLS are complementary to each other. Large parts of the gravity wave spectrum are covered by joint observations. This opens up fascinating vistas for future gravity wave research.

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Section: Time Series Of Gravity Wave Variancesmentioning

confidence: 99%

Intercomparison of AIRS and HIRDLS stratospheric gravity wave observations

Meyer¹,

Ern²,

Hoffmann³

et al. 2018

Atmos. Meas. Tech.

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“…This indicates the potential errors associated with estimating ozone loss in the lower stratosphere, where mixing across the vortex edge is important. These types of errors will presumably also be important in other studies Rösevall et al, 2007Rösevall et al, , 2008 where ozone loss is calculated over the whole vortex rather than the vortex core.…”

Section: Assimilation-based Ozone Loss Estimatesmentioning

confidence: 99%

“…The magnitude of the loss, nearly 0.6 ppmv, is smaller than many other estimates: for the 1 February-10 March period, Grooss and Müller Interestingly, our results agree best with those of Rösevall et al (2008), who use an ozone loss estimation technique that is most similar to our own method (although they use a CTM and do not calculate vertical motion explicitly). Rösevall et al (2007) estimate the ozone loss in the 1 February-10 March period to be in the 0.6-0.9 ppmv range, irrespective of whether it is calculated using Odin SMR or EOS MLS data. Most other studies, apart from the three listed in the above paragraph, present ozone loss for the entire 2004/05 winter, and therefore we cannot directly compare our results with results from these studies.…”

Section: Assimilation-based Ozone Loss Estimatesmentioning

confidence: 99%

Estimation of Arctic ozone loss in winter 2004/05 based on assimilation of EOS MLS and SBUV/2 observations

Jackson

Orsolini

2008

Quart J Royal Meteoro Soc

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ABSTRACT:In this paper we present a new technique for the estimation of ozone loss in the stratospheric polar vortex based on the assimilation of Earth Observing System Microwave Limb Sounder (EOS MLS) and Solar Backscatter Ultraviolet radiometer (SBUV/2) ozone observations in the Met Office data assimilation system. We focus on the northern winter of 2004/05, which was exceptionally cold in the Arctic stratosphere, with associated large ozone depletion due to heterogeneous chemistry. Our ozone loss estimate, which was calculated for the 1 February to 10 March 2005 period, peaks at 450 K (approximately 17-18 km), and is 0.6 ppmv at that isentropic level (our loss estimate for the vortex core only was somewhat higher (1.0 ppmv) and indicates uncertainties related to mixing at the vortex edge). This value is similar to or smaller than results from other studies, which estimate ozone loss in this period to be in the 0.6-1.2 ppmv range. When combined with results from other studies that estimate ozone loss occurring outside our assimilation period, we obtain an estimate of 0.8-1.2 ppmv for ozone loss from early January to early March 2005. We find a second maximum in ozone loss for the 1 February-10 March period near 650 K (approximately 25 km) of around 0.4 ppmv. This is a lower figure than found in other studies, but ozone loss is actually much stronger at this level outside the vortex in a low-ozone pocket in the Aleutian anticyclone, likely due to the NOx catalytic cycle. Our results show that the ozone data assimilation method we have used to estimate ozone loss is very promising, and can lead to potentially more accurate ozone-loss estimates than other methods.

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“…Data assimilation is a process 20 by which observations are introduced into a model while constraining these to follow model physics (Lahoz et al, 2010) . We have used an updated version of the DIAMOND model (Rösevall et al, 2007) to treat the Odin observations. Two O 3 fields are produced in the model, one is a passive O 3 field that is only transported by advection and another one is an active O 3 field that is modified by assimilation of the Odin/SMR data.…”

Section: Introductionmentioning

confidence: 99%

“…This study concerns ozone loss over both poles utilizing 12 years of ozone data from Odin/Sub-Millimetre Radiometer (SMR). We have applied the data assimilation technique described by Rösevall et al (2007) with a number of improvements to study the inter-annual Two SMR ozone products retrieved from the emission lines centred at 501 GHz and 544 GHz were used. An internal comparison of the two analyses using 501 GHz and 544 GHz ozone has been carried out by inspecting the vortex mean ozone in March and October during 2002and 2003-2012 in the Northern and Southern Hemisphere, respectively.…”

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confidence: 99%

A long term study of polar ozone loss derived from data assimilation of Odin/SMR observations

Sagi

Murtagh

2016

Preprint

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Abstract. Odin, a Swedish-led satellite project in collaboration with Canada, France and Finland, was launched on 20 February 2001 and continues to produce profiles of chemical species relevant to understanding the middle and upper atmosphere. Longterm observations of stratospheric ozone are useful for trend analysis of chemical ozone loss. This study concerns ozone loss over both poles utilizing 12 years of ozone data from Odin/Sub-Millimetre Radiometer (SMR). We have applied the data assimilation technique described by Rösevall et al. (2007) with a number of improvements to study the inter-annual Two SMR ozone products retrieved from the emission lines centred at 501 GHz and 544 GHz were used. An internal comparison of the two analyses using 501 GHz and 544 GHz ozone has been carried out by inspecting the vortex mean ozone in March and October during 2002and 2003-2012 in the Northern and Southern Hemisphere, respectively. Ozone de-10 rived from data assimilation using the two data sets match within 10% at the levels studied, while below 550 K in the Southern Hemispheremore than 50% of the difference is found. Here, 544 GHz ozone is 0.5 parts per million volume ( ppmv) lower than 501 GHz ozone because of better sensitivity in 544 GHz ozone in the lower stratosphere. Comparisons with other studies have been mainly performed against Sonkaew et al. (2013) since Sonkaew et al. (2013) is one of the few studies having consistent estimations of ozone depletion using a SCanning Imaging Absorption SpectroMeter for Atmospheric CHartographY (SCIA- IntroductionOzone depletion and climate change are indirectly linked. Several studies have predicted that the stratospheric cooling induced 5 by the increasing atmospheric carbon dioxide will enhance ozone depletion (Austin et al., 1992; Shindell et al., 1998). In practice, the Arctic lower stratosphere has been getting colder over the past decades (WMO, 2011). The linear dependence, demonstrated by (Rex et al., 2006), between the ozone depletion and the volume of air having temperature below the threshold for polar stratospheric cloud (PSC) formation implies that the stratospheric O 3 depletion in Northern Hemisphere may become worse if the cooling trend continues. It is therefore important to have continuous observations and trend analyses of the ozone 10 depletion.Ozone loss has been quantified by using a variety of techniques based on different assumptions and instruments (e.g. Eichmann et al., 2002;Grooß and Müller, 2003; Rex et al., 2006; Singleton et al., 2007; Tilmes et al., 2004; Tsvetkova et al., 2007). However, most of the studies were done for individual winters in the last decade. For instance, in the Arctic winter 2010/2011 several groups reported the unprecedented dramatic ozone depletion over the Arctic polar region approaching that 15 of the Antarctic ozone hole (e.g. Arnone et al., 2012; Manney et al., 2011; Sinnhuber et al., 2011). This winter was obviously different from other Arctic winters from 2000 since the polar vortex was strong and isolated the vo...

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Ozone depletion in the 2006/2007 Arctic winter

Cited by 26 publications

References 11 publications

Intercomparison of AIRS and HIRDLS stratospheric gravity wave observations

Intercomparison of AIRS and HIRDLS stratospheric gravity wave observations

Estimation of Arctic ozone loss in winter 2004/05 based on assimilation of EOS MLS and SBUV/2 observations

A long term study of polar ozone loss derived from data assimilation of Odin/SMR observations

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