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The MLS CH3CN Product

Contact: Michelle Santee

Basic Information

CH3CN is a long-lived pollutant whose atmospheric source is, primarily, biomass burning.
The CH3CN Molecule
CH3CN Molecule visualization

How it is part of MLS Science Objectives

One of the MLS objectives is to quantify aspects of how pollution affects chemistry of the upper troposphere and stratosphere, with consequent effects on climate and ozone layer stability. The MLS CH3CN data will help quantify the extent to which biomass burning might affect upper troposphere and stratosphere chemistry.

How EOS MLS measures CH3CN

The standard methyl cyanide product is taken from the 640 GHz retrieval.

CH3CN Information from the Spectroscopy Database

Quick Product Information for data version v4.2

This product should not be used without significant discussion with the MLS team

  • Swath Name: CH3CN
  • Status Flag: Only use profiles for which the Status field is zero.
  • Useful Range: 46 - 1.0 hPa
  • DAAC Short Name: ML2CH3CN
  • Precision: Only use values for which the estimated precision is a positive number.
  • Quality Threshold: >1.4
  • Convergence Threshold: <1.05
Download EOS Aura MLS CH3CN v4.2 data

Publications related to the MLS CH3CN data product


  1. Santee, M.L., G.L. Manney, N.J. Livesey, M.J. Schwartz, J.L. Neu, W.G. Read, "A comprehensive overview of the climatological composition of the Asian summer monsoon anticyclone based on 10 years of Aura Microwave Limb Sounder measurements", Journal of Geophysical Research: Atmospheres 122, doi:10.1002/2016jd026408, 2017. reprint


  1. Pumphrey, H.C., M.L. Santee, N.J. Livesey, M.J. Schwartz, W.G. Read, "Microwave Limb Sounder observations of biomass-burning products from the Australian bush fires of February 2009", Atmospheric Chemistry and Physics 11, 2, 6285-6296, doi:10.5194/acp-11-6285-2011, 2011. reprint


  1. Cofield, R.E., P.C. Stek, "Design and field-of-view calibration of 114-660 GHz optics of the Earth Observing System Microwave Limb Sounder", IEEE Transactions on Geoscience and Remote Sensing 44, no. 5, 1166-1181, doi:10.1109/TGRS.2006.873234, 2006. reprint


  1. Livesey, N.J., M.D. Fromm, J.W. Waters, G.L. Manney, M.L. Santee, W.G. Read, "Enhancements in lower stratospheric CH3CN observed by UARS MLS fillowing boreal forest fires", Journal of Geophysical Research 109, D06308, doi:10.1029/2003JD004055, 2004. reprint


  1. Livesey, N.J., J.W. Waters, R. Khosravi, G.P. Brasseur, G.S. Tyndall, W.G. Read, "Stratospheric CH3CN from the UARS Microwave Limb Sounder", Geophysical Research Letters 28, 779-782, doi:10.1029/2000GL012144, 2001. reprint

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