Veranstaltungskalender

(Wegener Center)

"Enhancing the potential of radio occultation data for global climate wind field monitoring"

This seminar starts out with a short introduction on the satellite-based radio occultation (RO) method. By probing the Earth’s atmosphere with a GNSS radio signal, the RO method allows to derive atmospheric profiles for weather and climate applications. Standard atmospheric information from RO data are profiles of pressure, density, temperature, and geopotential height, spanning the free troposphere to the stratosphere (FTS). This talk introduces a pioneering application of RO data for global wind field monitoring and analysis. These new climatic winds are derived from monthly mean RO geopotential fields and share RO’s unique key properties of long-term stability and high vertical resolution in the FTS. The novel approach goes beyond traditional geostrophic, gradient, and equatorial balance approximations by incorporating advection and curvature terms. The derived RO climatic wind fields have been systematically evaluated against the ERA5 reanalysis winds. Results show that the RO climatic winds offer great potential for more accurately representing monthly wind variations, reducing biases, and capturing key atmospheric features compared to traditional wind approximations. As an application example, I illustrate the potential of these RO climatic winds to accurately capture features of the tropical width. In conclusion, the RO climatic wind record is a valuable new resource for the scientific community, supporting climate monitoring and analysis and enhancing our understanding of atmospheric dynamics - particularly in the stratosphere, where observational data are still limited.

Beate Althammer: (Humboldt-Universität Berlin)

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