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Microwave Limb Sounder

Welcome

The Microwave Limb Sounder (MLS) experiments measure naturally-occurring microwave thermal emission from the limb (edge) of Earth's atmosphere to remotely sense vertical profiles of atmospheric gases, temperature, pressure, and cloud ice. The overall objective of these experiments is to provide information that will help improve our understanding of Earth's atmosphere and global change.

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BrO HO2 CH3Cl CH3CN CH3OH
O3 H2O OH HOCl ClO
IWC HCl RHi HCN CO
N2O GPH Temperature HNO3 All

NEAR REAL-TIME DATA VIEWER

Current GMT day:    
Maps @ 46hPa; SO2 @ 147hPa and CO @ 215hPa

Latest Publications

  1. Minschwaner, K., and G.L. Manney, "Derived Methane in the Stratosphere and Lower Mesosphere from Aura Microwave Limb Sounder Measurements of Nitrous Oxide, Water Vapor, and Carbon Monoxide," J. Atmos. Chem., in press.

  2. Wargan, K., S. Pawson, M.A. Olsen, J.C. Witte, A.R. Douglass, J.R. Ziemke, S.E. Strahan, and J.E. Nielsen, "The Global Structure of UTLS Ozone in GEOS-5: A Multi-Year Assimilation of EOS Aura Data," Journal of Geophysical Research: Atmospheres, 10.1002/2014JD022493, in press.

  3. Carn, S.A., K. Yang, A.J. Prata, and N.A. Krotkov, "Extending the long-term record of volcanic SO2 emissions with the Ozone Mapping and Profiler Suite OMPS Nadir Mapper," Geophys. Res. Lett., 10.1002/2014/GL062437, in press.

  4. Kristiansen, N.I., A.J. Prata, A. Stohl, and S.A. Carn, "Stratospheric volcanic ash emissions from the 13 February 2014 Kelut eruption," Geophys. Res. Lett. 42, doi:10.1002/2014GL062307, 2015.   reprint  

  5. Frankland, V.L., A.D. James, W. Feng, and J.M.C. Plane, "The uptake of HNO3 on meteoric smoke analogues," J. Atmos. Solar-Terr. Phys., in press.

> More Publications

MLS v4 Data Released to the Public


The science team for the Microwave Limb Sounder (MLS) on the Aura satellite is pleased to announce the release of a new MLS "Version 4.2" dataset. Notable improvements for v4.2, compared to the earlier v3.3/v3.4 data, include a significant reduction in the severity and frequency of cloud impacts on the ozone, carbon monoxide and nitric acid products (mainly affecting the tropical upper troposphere); a greater yield of useful OH observations from more recent years in the mission; and a new methanol product (for which further validation is planned).

MLS v4.2 (and earlier) data are available from the NASA GES-DISC. Users are urged to read the MLS v4.2 data quality document (available from the same location) and encouraged to contact the MLS science team with any questions. Reprocessing of the 10-year MLS record with the v4.2 algorithms is underway and is estimated to be completed in early 2016. "Forward processing" of ongoing MLS observations has also been updated to v4.2. Forward processing with earlier (v3.4 and v2.3) algorithms will be discontinued after March 31st, 2015.


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