References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-6-4057-2006

Search for evidence of trend slow-down in the long-term TOMS/SBUV total ozone data record: the importance of instrument drift uncertainty

Stolarski

R. S.

¹ Frith

S. M.

NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA

Science Systems and Applications, Inc., Lanham, MD 20706, USA

08 09 2006

6 12 4057 4065

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We have developed a merged ozone data set (MOD) for the period October 1978 through June 2006 combining total ozone measurements (Version 8 retrieval) from the TOMS (Nimbus 7, Earth Probe) and SBUV/SBUV2 (Nimbus 7, NOAA 9/11/16) series of satellite instruments. We use the MOD data set to search for evidence of ozone recovery in response to the observed leveling off of chlorine and bromine compounds in the stratosphere. A crucial step in any time series analysis is the evaluation of uncertainties. In addition to the standard statistical time series uncertainties, we evaluate the possible instrument drift uncertainty for the MOD data set. We combine these two sources of uncertainty and apply them to a cumulative sum of residuals (CUSUM) analysis for trend slow-down. For the extra-polar mean between 60° S and 60° N, the apparent slow-down in trend is found to be clearly significant if instrument uncertainties are ignored. When instrument uncertainties are added, the slow-down becomes marginally significant at the 2σ level. For the mid-latitudes of the northern hemisphere (30° to 60° N) the trend slow-down is highly significant at the 2σ level, while in the southern hemisphere the trend slow-down has yet to meet the 2σ significance criterion. The rate of change of chlorine/bromine compounds is similar in both hemispheres, and we expect the ozone response to be similar in both hemispheres as well. The asymmetry in the trend slow-down between hemispheres likely reflects the influence of dynamical variability, and thus a clearly statistically significant response of total ozone to the leveling off of chlorine and bromine in the stratosphere is not yet indicated.

References 1

Ahn, C., Bhartia, P. K., Wellemeyer, C. G., Taylor, S. L., and Labow, G. L.: "Validating V8 SBUV ozone profile data with external data sources (microwave, LIDAR and sonde)", Proceedings of the XX Quadrennial Ozone Symposium, Kos, 1–8 June, Greece, 2004.

Anderson, J., Russell, J. M., Solomon, S., and Deaver, L. E.: "Halogen occultation experiment confirmation of stratospheric chlorine decreases in accordance with the Montreal Protocol", J. Geophys. Res., 105, 4483–4490, 2000.

Bhartia, P. K., McPeters, R. D., Mateer, C. L., Flynn, L. E., and Wellemeyer, C.: "Algorithm for the estimation of vertical ozone profiles from the backscattered ultraviolet technique", J. Geophys. Res., 101, 18 793–18 806, 1996.

Bhartia, P. K., McPeters, R. D., Stolarski, R. S., Flynn L. E., and Wellemeyer, C. G.: "A quarter century of ozone observations by SBUV and TOMS", Proceedings of the XX Quadrennial Ozone Symposium, Kos, 1–8 June, Greece, 2004.

Deland, M. T., Huang, L.-K., Taylor, S. L., McKay, C. A., Cebula, R. P., Bhartia, P. K., and McPeters, R. D.: "Long-term SBUV and SBUV/2 instrument calibration for Version 8 data", Proceedings of the XX Quadrennial Ozone Symposium, Kos, 1–8 June, Greece, 2004.

Dhomse, S.,~Weber, M.,~Wohltmann, I.,~Rex, M., and~Burrows, J P.: "On the possible causes of recent increases in northern hemisphere total ozone from a statistical analysis of satellite data from 1979 to 2003", Atmos. Chem. Phys., 6, 1165–1180, 2006.

Douglass, A. R., Rood, R. B., Kawa, S. R., and Allen, D. J.: "A three-dimensional simulation of the evolution of the middle latitude winter ozone in the middle stratosphere", J. Geophys. Res., 102, 19 217–19 232, 1997.

Douglass, A. R., Schoeberl, M. R., Rood R. B., and Pawson, S.: "Evaluation of transport in the lower tropical stratosphere in a global chemistry and transport model", J. Geophys. Res., 108, 4259, doi:10.1029/2002JD002696, 2003.

Fioletov, V. E., Bodeker, G. E., Miller, A. J., McPeters, R. D., and Stolarski, R.: "Global and zonal total ozone variations estimated from ground-based and satellite measurements: 1964–2000", J. Geophys. Res., 107, 4647, doi:10.1029/2001JD001350, 2002.

Frederick, J. E., Cebula, R. P., and Heath, D. F.: "Instrument characterization for the detection of long-term changes in stratospheric ozone: An analysis of the SBUV/2 radiometer", J. Atmos. Oceanic Technol., 3, 472–480, 1986.

Hadjinicolaou, P., Pyle. J. A., and Harris, N. R. P.: "The recent turnaround in stratospheric ozone over northern middle latitudes: A dynamical modeling perspective", Geophys. Res. Lett., 32, L12821, doi:10.1029/2005GL022476, 2005.

Heath, D. F., Krueger, A. J., Roeder, H. R., and Henderson, B. D.: "The solar backscatter ultraviolet and total ozone mapping spectrometer (SBUV/TOMS) for Nimbus G", Opt. Eng., 14, 323–331, 1975.

Herman J. R., Hudson, R., McPeters, R., Stolarski, R., Ahmad, Z., Gu, X. Y., Taylor S., and Wellemeyer, C.: "A new self-calibration method applied to TOMS and SBUV backscattered ultraviolet data to determine long-term global ozone change", J. Geophys. Res., 96, 7531–7545, 1991.

Hilsenrath, E., Cebula, R. P., Deland, M. T., Laamann, K., Taylor, S., Wellemeyer, C., and Bhartia, P. K.: "Calibration of the NOAA-11 Solar Backscatter Ultraviolet (SBUV/2) Ozone Data Set from 1989 to 1993 using In-Flight Calibration Data and SSBUV", J. Geophys. Res., 100, 1351–1366, 1995.

Labow, G. J., Meters, R. D., and Bhartia, P. K.: "A comparison of TOMS, SBUV & SBUV/2 total column ozone data with data from groundstations", Proceedings of the XX Quadrennial Ozone Symposium, Kos, 1–8 June, Greece, 2004.

McPeters, R. D., Bhartia, P. K., Krueger, A. J., et al., "Nimbus-7 Total Ozone Mapping Spectrometer (TOMS) data product user's guide", NASA Ref. Pub. No. 1384, 1996.

McPeters, R. D., Bhartia, P. K., Krueger, A. J., et al., "Earth Probe Total Ozone Mapping Spectrometer (TOMS) data product user's guide", NASA/TP–1998-206895, 1998.

Montzka, S. A., Butler, J. H., Elkins, J. W., Thompson, T. M., Clarke, A. D., and Lock, L. T.: "Present and future trends in the atmospheric burden of ozone-depleting substances", Nature, 398, 690–694, 1999.

Montzka, S. A., Butler, J. H., Hall, B. D., Mondeel D. J., and Elkins, J. W.: "A decline in tropospheric organic bromine", Geophys. Res. Lett., 30(15), 1836, doi:10.1029/2003GL017745, 2003.

Newchurch, M. J., Yang, E.-S., Cunnold, D. M., Reinsel, G. C., Zwodny, J. M., and Russell III, J. M.: "Evidence for slowdown in stratospheric ozone loss: First stage of ozone recovery", J. Geophys. Res., 108, 4507, doi:10.1029/2003JD003471, 2003.

Reinsel G. C.: "Trend analysis of upper stratospheric Umkehr ozone data for evidence of turnaround", Geophys. Res. Lett., 29, 1451, doi:10.1029/2002GL014716, 2002.

Rinsland, C. P., Mathieu, E., Zander, R., Jones, N. B., Chipperfield, M. P., Goldman, A., Anderson, J., Russell, J. M., Demoulin, P., Notholt, J., Toon, G. C., Blavier, J. F., Sen, B., Sussmann, R., Wood, S. W., Meier, A., Griffith, D. W. T., Chiou, L. S., Murcray, F. J., Stephen, T. M., Hase, F., Mikuteit, S., Schulz, A., and Blumenstock, T.: "Long-term trends of inorganic chlorine from ground-based infrared solar spectra: Past increases and evidence for stabilization", J. Geophys. Res., 108, 4252, doi:10.1029/2002JD003001, 2003.

Staehelin, J., Harris, N. R. P., Appenzeller, C., and Eberhard, J.: "Ozone trends: A review", Rev. Geophys., 39, 231–290, 2001.

Stolarski, R., Bojkov, R., Bishop, L., Zerefos, C., Staehelin, J., and Zawodny, J.: "Measured trends in stratospheric ozone", Science, 256, 342–349, 1992.

Stolarski, R. S., Douglass, A. R., Steenrod, S., and Pawson, S.: "Trends in stratospheric ozone: Lessons learned from a 3D chemical transport model", J. Atmos. Sci., 63, 1028–1041, 2006.

Taylor, S. L., Cebula, R. P., Deland, M. T., Huang, L. K., Stolarski, R. S., and McPeters, R. D.: "Improved calibration of NOAA-9 and NOAA-11 SBUV/2 total ozone data using in-flight validation methods", Int. J. Remote Sensing, 24, 315–328, 2003.

WMO (World Meteorological Organization): "Scientific Assessment of Ozone Depletion: 1998", Global Ozone Research and Monitoring Project-Report No. 44, Geneva, 1999.

WMO (World Meteorological Organization): "Scientific Assessment of Ozone Depletion: 2002", Global Ozone Research and Monitoring Project-Report No. 47 Geneva, 2003.

Yang, E. -S., Cunnold, D. M., Salawitch, R. J., McCormick, M. P., Russell III, J. J., Zawodny, M., Oltmans, S., and Newchurch, M. J.: "Attribution of recovery in lower-stratospheric ozone", Journal of Geophysical Research, in press, pre-print available at http://science.nasa.gov/headlines/y2006/images/ozone/preprint.pdf, 2006.