Microwave Limb Sounder

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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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Hunga Tonga Volcano: Reminder on the Proper Use of MLS Data

There is understandably a widespread interest in using Aura Microwave Limb Sounder (MLS) observations to examine the impact of the Hunga Tonga volcano on the stratosphere. MLS is certainly a unique resource in this regard, and we in the MLS team look forward to hearing about and/or participating in such research in the time ahead. In the meantime, we must underscore that MLS data should only be used if they meet the screening criteria described in the MLS data quality document. These criteria measure how well the retrieved profiles fit the atmospheric microwave spectra observed. A profile that does not meet these criteria does not fit the MLS-measured radiances well, and thus should not be considered a valid MLS measurement. We are in the early stages of evaluating the MLS observations of the clearly highly perturbed stratosphere, and will follow up with more information as it becomes evident. As ever, we welcome any queries from the user community. Many thanks to you all for your interest in and use of MLS data.

Latest Publications

  1. Ghysels, M., G. Durry, N. Amarouche, J. Samake, F. Frérot and E. Rivière
    A lightweight balloon-borne mid-infrared hygrometer to probe the middle atmosphere: Pico-Light H2O. Comparison with Aura-MLS v4 and v5 satellite measurements
    Atmospheric Measurement Techniques Discussions doi:10.5194/amt-2020-269 in review
  2. Heue, K., D. Loyola, F. Romahn, W. Zimmer, S. Chabrillat, Q. Errera, J. Ziemke and N. Kramarova
    Tropospheric ozone retrieval by a combination of TROPOMI/S5P measurements with BASCOE assimilated data
    Atmospheric Measurement Techniques doi:10.5194/amt-2022-23 in review
  3. Khaykin, S., E. Moyer, M. Krämer, B. Clouser, S. Bucci, B. Legras, A. Lykov, A. Afchine, F. Cairo, I. Formanyuk, V. Mitev, R. Matthey, C. Rolf, C. Singer, N. Spelten, V. Volkov, V. Yushkov and F. Stroh
    Persistence of moist plumes from overshooting convection in the Asian monsoon anticyclone
    Atmos. Chem. Phys. Discuss. doi:10.5194/acp-2021-653 in review
  4. Martinsson, B., J. Friberg, O. Sandvik and M. Sporre
    Five satellite sensor study of the rapid decline of wildfire smoke in the stratosphere
    Atmos. Chem. Phys. Discuss. doi:10.5194/acp-2021-1015 in review
  5. McCormack, J., V.L. Harvey, N. Pedatella, D. Koshin, K. Sato, L. Coy, S. Watanabe, C. Randall, F. Sassi and L. Holt
    Intercomparison of Middle Atmospheric Meteorological Analyses for the Northern Hemisphere Winter 2009–2010
    Atmos. Chem. Phys. Discuss. doi:10.5194/acp-2021-224 in review