Trends in the vertical distribution of ozone: A comparison of two analyses of ozonesonde data

Logan, Jennifer A.; Megretskaia, I. A.; Miller, A. J.; Tiao, George C.; Choi, Dongseok; Zhang, L.; Stolarski, R. S.; Labow, G. J.; Hollandsworth, S. M.; Bodeker, G. E.; Claude, H.; Muer, D. De; Kerr, J. B.; Tarasick, D. W.; Oltmans, S. J.; Johnson, B. J.; Schmidlin, F. J.; Staehelin, J.; Viatte, P.; Uchino, Osamu

doi:10.1029/1999jd900300

Cited by 196 publications

(222 citation statements)

References 25 publications

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“…Ozone concentrations have declined at midlatitudes in the northern hemisphere lowermost stratosphere and tropopause region, with mean decadal trends peaking between −7% and −12% at 100-200 hPa in the winter and spring seasons (Logan et al, 1999). Both changes in transport and heterogeneous chemisty have been invoked to explain these large negative trends, but their relative contributions are uncertain.…”

Section: Radiation and Chemistry Issuesmentioning

confidence: 99%

Supersaturation, dehydration, and denitrification in Arctic cirrus

Kärcher

2005

Atmos. Chem. Phys.

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Abstract.A polar cirrus case study is discussed with the help of a one-dimensional model with explicit aerosol and ice microphysics. It is demonstrated that continuous cooling of air in regions with small amounts of ice and slow ice deposition rates of water vapor drives significant in-cloud supersaturations over ice, with potentially important consequences for heterogeneous halogen activation. Radiatively important cloud properties such as ice crystal size distributions are investigated, showing the presence of high number concentrations of small crystals in the cloud top region at the tropopause, broad but highly variable size spectra in the cloud interior, and mostly large crystals at the cloud base. It is found that weakly forced Arctic cirrostratus are highly efficient at dehydrating upper tropospheric air. Estimating nitric acid uptake in cirrus with an unprecedented treatment of diffusion-limited trapping in growing ice crystals suggests that such clouds could also denitrify upper tropospheric air masses efficiently, but a closer comparison to suitable observations is needed to draw a definite conclusion on this point. It is also shown that low temperatures, high ice supersaturations, and the absence of ice above but close to the cloud top region cause efficient uptake of nitric acid in background aerosol particles.

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Section: Radiation and Chemistry Issuesmentioning

confidence: 99%

Supersaturation, dehydration, and denitrification in Arctic cirrus

Kärcher

2005

Atmos. Chem. Phys.

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“…R. Khosravi et al (manuscript in preparation, 2008) discuss the averaging kernels associated with HIRDLS measurements. [15] There is a certain amount of variability associated with use of ozonesondes, as each sonde is a unique instrument, especially when station-dependent factors are considered [Thompson et al, 2003a[Thompson et al, , 2003b[Thompson et al, , 2007Liu et al, 2006;Logan et al, 1999]. Among the conditions that factor into this variability are (1) the manufacturer of the instrument used (ENSCI-Corporation sondes can read 5 -10% higher than sondes from Science Pump Corporation (SPC), above 20 km [Thompson et al, 2007;Smit et al, 2007]); (2) the concentration of potassium iodide (KI) sensing cathode solution used, and whether or not it includes a buffering agent may also produce variances of 15% above the partial pressure layer peak [Johnson et al, 2002]; and (3) whether and how pump efficiency correction factors are implemented, which may also cause differences of up to 15% at upper altitudes [Johnson et al, 2002].…”

Section: Ozone Precisionmentioning

confidence: 99%

Initial validation of ozone measurements from the High Resolution Dynamics Limb Sounder

et al. 2008

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[1] Comparisons of the latest High Resolution Dynamics Limb Sounder (HIRDLS) ozone retrievals (v2.04.09) are made with ozonesondes, ground-based lidars, airborne lidar measurements made during the Intercontinental Chemical Transport Experiment-B, and satellite observations. A large visual obstruction blocking over 80% of the HIRDLS field of view presents significant challenges to the data analysis methods and implementation, to the extent that the radiative properties of the obstruction must be accurately characterized in order to adequately correct measured radiances. The radiance correction algorithms updated as of August 2007 are used in the HIRDLS v2.04.09 data presented here. Comparisons indicate that HIRDLS ozone is recoverable between 1 and 100 hPa at middle and high latitudes and between 1 and 50 hPa at low latitudes. Accuracy of better than 10% is indicated between 1 and 30 hPa (HIRDLS generally low) by the majority of the comparisons with coincident measurements, and 5% is indicated between 2 and 10 hPa when compared with some lidars. Between 50 and 100 hPa, at middle and high latitudes, accuracy is 10-20%. The ozone precision is estimated to be generally 5-10% between 1 and 50 hPa. Comparisons with ozonesondes and lidars give strong indication that HIRDLS is capable of resolving fine vertical ozone features (1-2 km) in the region between 1 and 50 hPa. Development is continuing on the radiance correction and the cloud detection and filtering algorithms, and it is hoped that it will be possible to achieve a further reduction in the systematic bias and an increase in the measurement range downward to lower heights (at pressures greater than 50-100 hPa).

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“…The abundance of tropospheric ozone is increasing at many sites over the globe [Logan et al, 1999], and ozone precursor emissions are increasing especially rapidly in Asian countries, particularly China and India, leading one to expect important changes in atmospheric composition [e.g. Lelieveld …”

Section: Introductionmentioning

confidence: 99%