Re-analysis of ground-based microwave ClO measurements from Mauna Kea, 1992 to early 2012
Author:
Connor B. J.,Mooney T.,E Nedoluha G.,Barrett J. W.,Parrish A.,Koda J.,Santee M. L.
Abstract
Abstract. We present a re-analysis of upper stratospheric ClO measurements from the ground-based millimeter-wave instrument from January 1992 to February 2012. These measurements are made as part of the Network for the Detection of Atmospheric Composition Change (NDACC) from Mauna Kea, Hawaii, (19.8° N, 204.5° E). Here, we use daytime and nighttime measurements together to form a day-night spectrum, from which the difference in the day and night profiles is retrieved. These results are then compared to the day-night difference profiles from the UARS and Aura Microwave Limb Sounder (MLS) instruments. We also compare them to our previous analyses of the same data, in which we retrieved the daytime ClO profile. The major focus will be on comparing the year-to-year and long-term changes in ClO derived by the two analysis methods. We conclude that the re-analyzed data set has less short-term variability and exhibits a more constant long-term trend. Data from 1995–2012 indicate a linear decline of mid-stratospheric ClO of 0.64 ± 0.08% yr−1.
Publisher
Copernicus GmbH
Reference9 articles.
1. Connor, B. J., Mooney, T., Barrett, J., Solomon, P., Parrish, A., and Santee, M.: Comparison of ClO measurements from the Aura Microwave Limb Sounder to ground-based microwave measurements at Scott Base, Antarctica, in spring 2005, J. Geophys. Res., 112, D24S42, https://doi.org/10.1029/2007JD008792, 2007. 2. Livesey, N. J., Read, W. G., Froidevaux, L., Lambert, A., Manney, G. L., Pumphrey, H. C., Santee, M. L., Schwartz, M. J., Wang, S., Cofeld, R. E., Cuddy, D. T., Fuller, R. A., Jarnot, R. F., Jiang, J. H., Knosp, B. W., Stek, P. C., Wagner, P. A., and Wu, D. L.: Version 3.3 Level 2 data quality and description document, JPL D-33509, 2011. 3. Nedoluha, G. E., Connor, B. J., Barrett, J., Mooney, T., Parrish, A., Boyd, I., Wrotny, J. E., Gomez, R. M., Koda, J., Santee, M. L., and Froidevaux, L.: Ground-based Measurements of ClO from Mauna Kea and Intercomparisons with Aura and UARS MLS, { J. Geophys. Res., }116, D02307, https://doi.org/10.1029/2010JD014732, 2011. 4. Ricaud, P., Chipperfield, M. P., Waters, J. W., Russell, J. M., and Roche, A. E.: Temporal Evolution of Chlorine Monoxide in the Middle Stratosphere, J. Geophys. Res., 105, 4459–4469, 2000. 5. Santee, M. L., Lambert, A., Read, W. G., Livesey, N. J., Manney, G. L., Cofeld, R. E., Cuddy, D. T., Daffer, W. H., Drouin, B. J., Froidevaux, L., Fuller, R. A., Jarnot, R. F., Knosp, B. W., Perun, V. S., Snyder, W. V., Stek, P. C., Thurstans, R. P., Wagner, P. A., Waters, J. W., Connor, B., Urban, J., Murtagh, D., Ricaud, P., Barret, B., Kleinboehl, A., Kuttippurath, J., Kuellmann, H., von Hobe, M., Toon, G. C., and Stachnik, R. A.: Validation of the Aura Microwave Limb Sounder ClO measurements. J. Geophys. Res., 113, D15S22, https://doi.org/10.1029/2007JD008762, 2008.
|
|