Articles | Volume 21, issue 20
Research article
15 Oct 2021
Research article |  | 15 Oct 2021

Investigation and amelioration of long-term instrumental drifts in water vapor and nitrous oxide measurements from the Aura Microwave Limb Sounder (MLS) and their implications for studies of variability and trends

Nathaniel J. Livesey, William G. Read, Lucien Froidevaux, Alyn Lambert, Michelle L. Santee, Michael J. Schwartz, Luis F. Millán, Robert F. Jarnot, Paul A. Wagner, Dale F. Hurst, Kaley A. Walker, Patrick E. Sheese, and Gerald E. Nedoluha

Data sets

Atmospheric Chemistry Experiment (ACE): Mission overview ( P. F. Bernath, C. T. McElroy, M. C. Abrams, C. D. Boone, M. Butler, C. Camy-Peyret, M. Carleer, C. Clerbaux, P.-F. Coheur, R. Colin, P. DeCola, M. DeMazière, J. R. Drummond, D. Dufour, W. F. J. Evans, H. Fast, D. Fussen, K. Gilbert, D. E. Jennings, E. J. Llewellyn, R. P. Lowe, E. Mahieu, J. C. McConnell, M. McHugh, S. D. McLeod, R. Michaud, C. Midwinter, R. Nassar, F. Nichitiu, C. Nowlan, C. P. Rinsland, Y. J. Rochon, N. Rowlands, K. Semeniuk, P. Simon, R. Skelton, J. J. Sloan, M.-A. Soucy, K. Strong, P. Tremblay, D. Turnbull, K. A. Walker, I. Walkty, D. A. Wardle, V. Wehrle, R. Zander, and J. Zou

Advancements, measurement uncertainties, and recent comparisons of the NOAA frost point hygrometer ( E. G. Hall, A. F. Jordan, D. F. Hurst, S. J. Oltmans, H. Vömel, B. Kühnreich, and V. Ebert

EOS MLS Version 4.2x Level 2 data quality and description document (Revision E) ( N. J. Livesey, W. G. Read, P. A. Wagner, L. Froidevaux, A. Lambert, G. L. Manney, L. F. M. Valle, ,H. C. Pumphrey, M. L. Santee, M. J. Schwartz, S. Wang, R. A. Fuller, R. F. Jarnot, B. W. Knosp, E. Martinez, and R. R. Lay

Ground-based microwave measurements of water vapor from the midstratosphere to the mesosphere ( G. E. Nedoluha, R. M. Gomez, B. C. Hicks, J. Helmboldt, R. M. Bevilacqua, and A. Lambert

Validation of water vapor measured by SABER on the TIMED satellite ( P. Rong, J. M. Russell, B. T. Marshall, L. L. Gordley, M. G. Mlynczak, and K. A. Walker

Data Quality Flags for ACE-FTS Level 2 Version 4.1/4.2 Data Set P. Sheese and K. Walker

Short summary
The Microwave Limb Sounder (MLS), an instrument on NASA's Aura mission launched in 2004, measures vertical profiles of the temperature and composition of Earth's "middle atmosphere" (the region from ~12 to ~100 km altitude). We describe how, among the 16 trace gases measured by MLS, the measurements of water vapor (H2O) and nitrous oxide (N2O) have started to drift since ~2010. The paper also discusses the origins of this drift and work to ameliorate it in a new version of the MLS dataset.
Final-revised paper