The MLS OH Product
Basic Information
OH is one of the most chemically-active, and important, molecules in atmospheric chemistry. |
The OH Molecule
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How it is part of MLS Science Objectives
MLS is making the first global measurements of OH, which are providing needed new information on stratospheric hydrogen chemistry that affects ozone. Lack of global OH measurements has previously been a major limitation in constraining models of stratospheric chemistry
How EOS MLS measures OH
The standard product for OH is taken from the 2.5 THz (Core+R5) retrieval.
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OH Information from the Spectroscopy Database
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Quick Product Information for data version v2.2
- Swath Name: OH
- Vertical Resolution:~2.5km
- Useful Range:32-0.0032 hPa
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- DAAC Short Name: ML2OH
- Precision:20 106cm-3 from 32-10 hPa
0.6 - 8 106cm-3 from 10-0.01 hPa
- Accuracy: TBD
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| Simulations indicate closure for OH to better than 10% of the daytime (ascending) typical OH values. OH is being validated using the balloon-borne FIRS-2 and BOH instruments. Preliminary results for September 23, 2004 for the region of Ft. Sumner, NM show excellent agreement between the FIRS-2, BOH, and MLS instruments [Pickett et al., 2005].1
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Retrieved concentrations of OH in the mesosphere are often negative with estimated precisions that are much smaller than the size of the negative excursion. These negative concentrations are likely due to subtle inadequacies in the forward model or due to non-linearities in the retrieval. Use of day-night differences does not help in this case. Positive concentrations in levels adjacent to negative concentrations are likely to overestimate the actual OH concentration.
v2.2 OH Averaging Kernel
colored lines are individual kernels; thick dashed line is full width at half maximum, thick solid is integrated kernel value
Publications related to the MLS OH data product
2008
- Pickett, H.M., B.J. Drouin, T. Canty, R.J. Salawitch, R.A. Fuller, V.S. Perun, N.J. Livesey, J.W. Waters, R.A. Stachnik, S.P. Sander, W.A. Traub, K.W. Jucks, K. Minschwaner, "Validation of Aura Microwave Limb Sounder OH and HO2 measurements", vol 113, pgs. D16S30, 2008. Reprint
- Roesevall, J.D., D.P. Murtagh, J. Urban, W. Feng, P. Eriksson, S. Brohede, "A study of ozone depletion in the 2004/2005 Arctic winter based on data from Odin/SMR and Aura/MLS", vol 113, pgs. D13301, 2008. Reprint
2007
- Mueller, E.R., R. Henschke, W.E. Robotham, L.A. Newman, L.M. Laughman, R.A. Hart, J. Kennedy, H.M. Pickett, "Terahertz local oscillator for the Microwave Limb Sounder on the Aura Satellite", vol 46, num no. 22, pgs. 4907-4915, 2007. Reprint
- Verronen, P.T., C.J. Rodger, M.A. Clilverd, H.M. Pickett, E. Turunen, "Latitudinal extent of the January 2005 solar proton event in the Northern Hemisphere from satellite observations of hydroxyl", vol 25, pgs. 2203-2215, 2007. Reprint
- Hocke, K., N. Kampfer, D. Ruffieux, L. Froidevaux, A. Parrish, I. Boyd, T. von Clarmann, T. Steck, Y.M. Timofeyev, A.V. Polyakov, E. Kyrola, "Comparison and synergy of stratospheric ozone measurements by satellite limb sounders and the ground-based microwave radiometer SOMORA", vol 7, pgs. 4117-4131, 2007. Reprint
2006
- Verronen, P.T., A. Seppala, E. Kyrola, J. Tamminen, H.M. Pickett, E. Turunen, "Production of Odd Hydrogen in the Mesosphere During the January 2005 Solar Proton Event", vol 33, pgs. L24811, 2006. Reprint
- Pickett, H.M., "Microwave Limb Sounder THz Module on Aura", vol 44, num no. 5, pgs. 1122-1130, 2006. Reprint
- Canty, T., H.M. Pickett, R.J. Salawitch, K.W. Jucks, W.A. Traub, J.W. Waters, "Stratospheric and Mesospheric HOx: Results from Aura MLS and FIRS-2", vol 33, pgs. L12802, 2006. Reprint
- Pickett, H.M., B.J. Drouin, T. Canty, L.J. Kovalenko, R.J. Salawitch, N.J. Livesey, W.G. Read, J.W. Waters, K.W. Jucks, W.A. Traub, "Validation of Aura MLS HOx measurements with remote-sensing balloon instruments", vol 33, pgs. L01808, 2006. Reprint
- Pickett, H.M., W.G. Read, K.K. Lee, Y.L. Yung, "Observation of Night OH in the Mesosphere", vol 33, pgs. L19808, 2006. Reprint
2000
- Gaidis, M.C., H.M. Pickett, C.D. Smith, S.C. Martin, R.P. Smith, P.H. Siegel, "A 2.5-THz Receiver Front End for Spaceborne Applications", vol 44, pgs. 733-739, 2000. Reprint
1996
- Pickett, H.M., D.B. Peterson, "Comparison of measured stratospheric OH with prediction", vol 101, num D11, pgs. 16,789-16,796, 1996. Reprint
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