Latitudinal structure of variations and trends in stratospheric NO2

Груздев, А. Н.

doi:10.1080/01431160902822815

Cited by 31 publications

(20 citation statements)

References 33 publications

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“…For ClONO 2 , negative trends of −5.8 ± 1.0 % decade −1 and −8.2 ± 1.4 % decade −1 are found for the 1990-2009 and 1996-2009 periods, respectively. The latter value is more negative by about 3 % decade −1 with respect to the trend in total tropospheric chlorine of −6.0 ± 0.5 % decade −1 observed over the same 1996-2009period (WMO, 2011a. In the light of Reaction (R2), this larger decline of ClONO 2 is consistent with a decrease of stratospheric NO 2 of about 3 % decade −1 as observed since 1996 from SAOZ, FTIR, and satellite nadir NO 2 data sets, suggesting that NO 2 could control the trend of ClONO 2 together with total chlorine.…”

Section: Resultsmentioning

confidence: 99%

“…Ground-based UV-visible SAOZ (Système d'Analyse par Observation Zénithale) and Fourier Transform Infra-Red (FTIR) spectrometers have been operating continuously at this station since 1990 and 1985, respectively, providing more than two decades of measurements. A combination of stratospheric NO 2 columns retrieved from the ERS-2/GOME (1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003), ENVISAT/SCIAMACHY (2003-2009, and METOP-A/ GOME-2 (2007-2009) satellite nadir instruments is also included in this study, permitting, for the first time, a thorough analysis of the long-term evolution of stratospheric NO 2 from three (two ground-based and one satellite) independent measurement techniques at this site. The paper is divided into 4 sections.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of stratospheric NO2 trends above Jungfraujoch using ground-based UV-visible, FTIR, and satellite nadir observations

et al. 2012

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Abstract. The trend in stratospheric NO 2 column at the NDACC (Network for the Detection of Atmospheric Composition Change) station of Jungfraujoch (46.5 • N, 8.0 • E) is assessed using ground-based FTIR and zenith-scattered visible sunlight SAOZ measurements over the period 1990 to 2009 as well as a composite satellite nadir data set constructed from ERS-2/GOME, ENVISAT/SCIAMACHY, and METOP-A/GOME-2 observations over the 1996-2009 period. To calculate the trends, a linear least squares regression model including explanatory variables for a linear trend, the mean annual cycle, the quasi-biennial oscillation (QBO), solar activity, and stratospheric aerosol loading is used. For the 1990-2009 period, statistically indistinguishable trends of −3.7 ± 1.1 % decade −1 and −3.6 ± 0.9 % decade −1 are derived for the SAOZ and FTIR NO 2 column time series, respectively. SAOZ, FTIR, and satellite nadir data sets show a similar decrease over the 1996-2009 period, with trends of −2.4 ± 1.1 % decade −1 , −4.3 ± 1.4 % decade −1 , and −3.6 ± 2.2 % decade −1 , respectively. The fact that these declines are opposite in sign to the globally observed +2.5 % decade −1 trend in N 2 O, suggests that factors other than N 2 O are driving the evolution of stratospheric NO 2 at northern mid-latitudes. Possible causes of the decrease in stratospheric NO 2 columns have been investigated. The most likely cause is a change in the NO 2 /NO partitioning in favor of NO, due to a possible stratospheric cooling and a decrease in stratospheric chlorine content, the latter being further confirmed by the negative trend in the ClONO 2 column derived from FTIR observations at Jungfraujoch. Decreasing ClO concentrations slows the NO + ClO → NO 2 + Cl reaction and a stratospheric cooling slows the NO + O 3 → NO 2 + O 2 reaction, leaving more NO x in the form of NO. The slightly positive trends in ozone estimated from ground-and satellitebased data sets are also consistent with the decrease of NO 2 through the NO 2 + O 3 → NO 3 + O 2 reaction. Finally, we cannot rule out the possibility that a strengthening of the Dobson-Brewer circulation, which reduces the time available for N 2 O photolysis in the stratosphere, could also contribute to the observed decline in stratospheric NO 2 above Jungfraujoch.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of stratospheric NO2 trends above Jungfraujoch using ground-based UV-visible, FTIR, and satellite nadir observations

et al. 2012

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“…Such models have been extensively used in recent years to infer trends in long-term atmospheric time series of groundbased instruments; in particular, they have been used to study the evolution of stratospheric ozone (Bodeker et al, 1998;Wohltmann et al, 2007;Fioletov, 2008;Mäder et al, 2010), NO 2 ( Van der A et al, 2006Van der A et al, , 2008Gruzdev, 2009;Hendrick et al, 2012) and other species (i.e. Remsberg, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Later, McLinden et al (2001) reproduced the observations of Liley et al (2000) using a 3-D CTM model, including halogen chemistry and assuming a negative trend in temperature of 0.5 K decade −1 . A few years later, Gruzdev (2009) analysed 23 stations from the NDACC database. Trends were found to be mostly positive in the middle and low latitudes of the Southern Hemisphere (SH) and mostly negative in the European sector of the middle latitudes of the Northern Hemisphere (NH).…”

Section: Introductionmentioning

confidence: 99%

Hemispheric asymmetry in stratospheric NO2 trends

et al. 2017

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Abstract. Over 20 years of stratospheric NO 2 vertical column density (VCD) data from ground-based zenith DOAS spectrometers were used for trend analysis, specifically, via multiple linear regression. Spectrometers from the Network for the Detection of Atmospheric Composition Change (NDACC) cover the subtropical latitudes in the Northern Hemisphere (Izaña, 28 • N), the southern Subantarctic (Ushuaia, 55 • S) and Antarctica (Marambio, 64 • S, and Belgrano, 78 • S). The results show that for the period 1993-2014, a mean positive decadal trend of +8.7 % was found in the subtropical Northern Hemisphere stations, and negative decadal trends of −8.7 and −13.8 % were found in the Southern Hemisphere at Ushuaia and Marambio, respectively; all trends are statistically significant at 95 %. Belgrano only shows a significant decadal trend of −11.3 % in the summer/autumn period. Most of the trends result from variations after 2005. The trend in the diurnal build-up per hour (DBU) was used to estimate the change in the rate of N 2 O 5 conversion to NO 2 during the day. With minor differences, the results reproduce those obtained for NO 2 . The trends computed for individual months show large monthto-month variability. At Izaña, the maximum occurs in December (+13.1 %), dropping abruptly to lower values in the first part of the year. In the Southern Hemisphere, the polar vortex dominates the monthly distributions of the trends. At Marambio, the maximum occurs in mid-winter (−21 %), whereas at the same time, the Ushuaia trend is close to its annual minimum (−7 %). The large difference in the trends at these two relatively close stations suggests a vortex shift towards the Atlantic/South American area over the past few years. Finally, the hemispheric asymmetry obtained in this work is discussed in the framework of the results obtained by previous works that considered tracer analysis and BrewerDobson circulation. The results obtained here provide evidence that the NO 2 produced by N 2 O decomposition is not the only cause of the observed trend in the stratosphere and support recent publications pointing to a dynamical redistribution starting in the past decade.

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“…The variability of the NO 2 content in the stratosphere and in the atmospheric boundary layer was studied thoroughly [28]; estimates of trends in the stratospheric NO 2 content were obtained [29]; and a significant negative anomaly in the stratospheric NO 2 content, caused by stratospheric air from the region of the Arctic ozone "hole," was observed over Moscow in the spring of 2011 [30].…”

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confidence: 99%

Stratosphere-troposphere interactions

Vargin

Володин

Karpechko³

et al. 2015

Her. Russ. Acad. Sci.

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Latitudinal structure of variations and trends in stratospheric NO₂

Cited by 31 publications

References 33 publications

Analysis of stratospheric NO<sub>2</sub> trends above Jungfraujoch using ground-based UV-visible, FTIR, and satellite nadir observations

Analysis of stratospheric NO<sub>2</sub> trends above Jungfraujoch using ground-based UV-visible, FTIR, and satellite nadir observations

Hemispheric asymmetry in stratospheric NO<sub>2</sub> trends

Stratosphere-troposphere interactions

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Latitudinal structure of variations and trends in stratospheric NO2

Cited by 31 publications

References 33 publications

Analysis of stratospheric NO&lt;sub&gt;2&lt;/sub&gt; trends above Jungfraujoch using ground-based UV-visible, FTIR, and satellite nadir observations

Analysis of stratospheric NO&lt;sub&gt;2&lt;/sub&gt; trends above Jungfraujoch using ground-based UV-visible, FTIR, and satellite nadir observations

Hemispheric asymmetry in stratospheric NO&lt;sub&gt;2&lt;/sub&gt; trends

Stratosphere-troposphere interactions

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Resources

About

Latitudinal structure of variations and trends in stratospheric NO₂

Analysis of stratospheric NO<sub>2</sub> trends above Jungfraujoch using ground-based UV-visible, FTIR, and satellite nadir observations

Analysis of stratospheric NO<sub>2</sub> trends above Jungfraujoch using ground-based UV-visible, FTIR, and satellite nadir observations

Hemispheric asymmetry in stratospheric NO<sub>2</sub> trends