Observing atmosphere and climate with occultation techniques – results from the OPAC-IROWG 2022 workshop
Observing atmosphere and climate with occultation techniques – results from the OPAC-IROWG 2022 workshop
Editor(s): Ulrich Foelsche, Andrea K. Steiner, Hui Shao, Anthony Mannucci, Kent B. Lauritsen, C. Marquardt, and Piet Stammes
Occultation techniques for observing the Earth’s atmosphere and climate comprise solar, lunar, stellar, navigation, and satellite-crosslink occultation methods, exploiting the electromagnetic spectrum from optical to radio signals via refraction, absorption, scattering, and reflection. Retrieved atmospheric variables range from bending angle, refractivity, pressure, geopotential height, temperature, and water vapor to greenhouse gases and particulate species such as aerosols and cloud liquid water. Information on ionosphere and space weather is also provided.

Occultation methods share the unique properties of self-calibration; high accuracy and vertical resolution; global coverage; and, if using radio signals, all-weather capability. Global navigation satellite system (GNSS) radio occultation has become particularly successful over the recent decades and provides accurate refraction-based measurements using data from all GNSS systems.

Occultation data are of high utility in numerical weather prediction, atmospheric physics, and climate science. Their application has further broadened in recent years, and new satellite missions and observation methods are on the way.

The OPAC-IROWG 2022 workshop brought together members from the different sub-communities and users of occultation data. The present Atmospheric Measurement Techniques special issue is dedicated to the results of this conference and recent achievements.

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24 Jul 2023
Assessing the Ducting Phenomenon and its Impact on GNSS Radio Occultation Refractivity Retrievals over the Northeast Pacific Ocean using Radiosondes and Global Reanalysis
Thomas E. Winning, Feiqin Xie, and Kevin J. Nelson
Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2023-150,https://doi.org/10.5194/amt-2023-150, 2023
Preprint under review for AMT (discussion: open, 2 comments)
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13 Jul 2023
Closing the gap in the tropics: the added value of radio-occultation data for wind field monitoring across the equator
Julia Danzer, Magdalena Pieler, and Gottfried Kirchengast
Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2023-137,https://doi.org/10.5194/amt-2023-137, 2023
Preprint under review for AMT (discussion: open, 1 comment)
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10 Mar 2023
GNSS radio occultation excess phase processing for climate applications including uncertainty estimation
Josef Innerkofler, Gottfried Kirchengast, Marc Schwärz, Christian Marquardt, and Yago Andres
Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2023-28,https://doi.org/10.5194/amt-2023-28, 2023
Revised manuscript accepted for AMT (discussion: closed, 6 comments)
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