The use of SMILES data to study ozone loss in the Arctic winter 2009/2010 and comparison with Odin/SMR data using assimilation techniques

Sagi, Kazutoshi; Murtagh, Donal; Urban, Joachim; Sagawa, Hideo; Kasai, Yasuko

doi:10.5194/acp-14-12855-2014

Cited by 9 publications

(8 citation statements)

References 32 publications

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“…1, an important O 3 loss in the lower stratosphere was also observed during other cold winters such as 2004/05 and 2007/08 (e.g. Singleton et al, 2007;Jin et al, 2006;Grooß and Müller, 2007;Jackson and Orsolini, 2008;Kuttippurath et al, 2009), which are also characterised by a ratio 1O Lower 3 /1O Middle 3 greater than 1 (Table 1).…”

Section: Overview Of Arctic Ozone Loss From 2002 To 2013mentioning

confidence: 54%

Two mechanisms of stratospheric ozone loss in the Northern Hemisphere, studied using data assimilation of Odin/SMR atmospheric observations

et al. 2017

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Abstract. Observations from the Odin/Sub-Millimetre Radiometer (SMR) instrument have been assimilated into the DIAMOND model (Dynamic Isentropic Assimilation Model for OdiN Data), in order to estimate the chemical ozone (O 3 ) loss in the stratosphere. This data assimilation technique is described in Sagi and Murtagh (2016), in which it was used to study the inter-annual variability in ozone depletion during the entire Odin operational time and in both hemispheres. Our study focuses on the Arctic region, where two O 3 destruction mechanisms play an important role, involving halogen and nitrogen chemical families (i.e. NO x = NO and NO 2 ), respectively. The temporal evolution and geographical distribution of O 3 loss in the low and middle stratosphere have been investigated between 2002 and 2013. For the first time, this has been done based on the study of a series of winter-spring seasons over more than a decade, spanning very different dynamical conditions. The chemical mechanisms involved in O 3 depletion are very sensitive to thermal conditions and dynamical activity, which are extremely variable in the Arctic stratosphere. We have focused our analysis on particularly cold and warm winters, in order to study the influence this has on ozone loss. The winter 2010/11 is considered as an example for cold conditions. This case, which has been the subject of many studies, was characterised by a very stable vortex associated with particularly low temperatures, which led to an important halogeninduced O 3 loss occurring inside the vortex in the lower stratosphere. We found a loss of 2.1 ppmv at an altitude of 450 K in the end of March 2011, which corresponds to the largest ozone depletion in the Northern Hemisphere observed during the last decade. This result is consistent with other studies. A similar situation was observed during the winters 2004/05 and 2007/08, although the amplitude of the O 3 destruction was lower. To study the opposite situation, corresponding to a warm and unstable winter in the stratosphere, we performed a composite calculation of four selected cases, 2003/04, 2005/06, 2008/09 and 2012/13, which were all affected by a major mid-winter sudden stratospheric warming event, related to particularly high dynamical activity. We have shown that such conditions were associated with low O 3 loss below 500 K (approximately 20 km), while O 3 depletion in the middle stratosphere, where the role of NO xinduced destruction processes prevails, was particularly important. This can mainly be explained by the horizontal mixing of NO x -rich air from lower latitudes with vortex air that takes place in case of strongly disturbed dynamical situation. In this manuscript, we show that the relative contribution of O 3 depletion mechanisms occurring in the lower or in the middle stratosphere is significantly influenced by dynamical and thermal conditions. We provide confirmation that the O 3 loss driven by nitrogen oxides and triggered by stratospheric warmings can outweigh the effects of halogens in the case of a ...

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Section: Overview Of Arctic Ozone Loss From 2002 To 2013mentioning

confidence: 54%

Two mechanisms of stratospheric ozone loss in the Northern Hemisphere, studied using data assimilation of Odin/SMR atmospheric observations

et al. 2017

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“…The spatial and temporal gradients in these analyses are expected to reflect dynamical and chemical processes rather than the details of the observing system. This feature is exploited in several studies of the photochemistry of the middle atmosphere, especially in the polar regions (see Robichaud et al, 2010;Lahoz et al, 2011;Sagi et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Copernicus stratospheric ozone service, 2009–2012: validation, system intercomparison and roles of input data sets

et al. 2015

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Abstract. This paper evaluates and discusses the quality of the stratospheric ozone analyses delivered in near real time by the MACC (Monitoring Atmospheric Composition and Climate) project during the 3-year period between September 2009 and September 2012. Ozone analyses produced by four different chemical data assimilation (CDA) systems are examined and compared: the Integrated Forecast System coupled to the Model for OZone And Related chemical Tracers (IFS-MOZART); the Belgian Assimilation System for Chemical ObsErvations (BASCOE); the Synoptic Analysis of Chemical Constituents by Advanced Data Assimilation (SACADA); and the Data Assimilation Model based on Transport Model version 3 (TM3DAM). The assimilated satellite ozone retrievals differed for each system; SACADA and TM3DAM assimilated only total ozone observations, BASCOE assimilated profiles for ozone and some related species, while IFS-MOZART assimilated both types of ozone observations. All analyses deliver total column values that agree well with ground-based observations (biases < 5 %) and have a realistic seasonal cycle, except for BASCOE analyses, which underestimate total ozone in the tropics all year long by 7 to 10 %, and SACADA analyses, which overestimate total ozone in polar night regions by up to 30 %. The validation of the vertical distribution is based on independent observations from ozonesondes and the ACE-FTS (Atmospheric Chemistry Experiment -Fourier Transform Spectrometer) satellite instrument. It cannot be performed with TM3DAM, which is designed only to deliver analyses of total ozone columns. Vertically alternating positive and negative biases are found in the IFS-MOZART analyses as well as an overestimation of 30 to 60 % in the polar lower stratosphere during polar ozone depletion events. SACADA underestimates lower stratospheric ozone by up to 50 % during these events above the South Pole and overestimates it by approximately the same amount in the tropics. The three-dimensional (3-D) analyses delivered by BASCOE are found to have the best quality among the three systems resolving the vertical dimension, with biases not exceeding 10 % all year long, at all stratospheric levels and in all latitude bands, except in the tropical lowermost stratosphere.The northern spring 2011 period is studied in more detail to evaluate the ability of the analyses to represent the exceptional ozone depletion event, which happened above the Arctic in March 2011. Offline sensitivity tests are performed during this month and indicate that the differences between the forward models or the assimilation algorithms are much less important than the characteristics of the assimilated data sets. They also show that IFS-MOZART is able to deliver realistic analyses of ozone both in the troposphere and in the stratoPublished by Copernicus Publications on behalf of the European Geosciences Union. sphere, but this requires the assimilation of observations from nadir-looking instruments as well as the assimilation of profiles, which are well resolved vertically an...

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“…The comparison concluded that our estimation of the ozone loss is approximately 0.3 ppmv lower than other studies (Kuttippurath et al, 2010;Hommel et al, 2014;Wohltmann et al, 2013) . In Sagi et al (2014) 9 Atmos. Chem.…”

Section: Comparison With Other Studiesmentioning

confidence: 99%

“…Since PT in dry air is conservative under adiabatic conditions air parcels normally move on constant PT surfaces. However during polar night conditions considerable descent occurs within the polar vortex and because of the vertical gradients in ozone we must consider the effects of the vertical transport on the estimates of ozone loss.A first-order upstream scheme was implemented in the current version of the model in order to take account of the vertical 5 motion (Sagi et al, 2014). Since the general descent rate inside the vortex is approximately 1−2K per day it is slow enough for the effects of numerical diffusion to be negligible.…”

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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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The use of SMILES data to study ozone loss in the Arctic winter 2009/2010 and comparison with Odin/SMR data using assimilation techniques

Cited by 9 publications

References 32 publications

Two mechanisms of stratospheric ozone loss in the Northern Hemisphere, studied using data assimilation of Odin/SMR atmospheric observations

Two mechanisms of stratospheric ozone loss in the Northern Hemisphere, studied using data assimilation of Odin/SMR atmospheric observations

Copernicus stratospheric ozone service, 2009–2012: validation, system intercomparison and roles of input data sets

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

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