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Communication Dans Un Congrès Année : 2019

Potential of a radar on a High-Altitude Platform to retrieve Dynamics and Microphysics in convection.

Audrey Martini
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Nicolas Viltard
Peggy Kirstetter
Julien Delanoë
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Résumé

For precipitation observations, high Altitude Platforms (HAP) could offer an interesting alternative to both ground- and space-borne instruments when neither configuration offers an optimal solution. Specifically, for Doppler radar measurement of meteorological targets, ground-based radars are incredibly useful but limited in spatial coverage while space-based instruments providing a 3D sampling are particularly challenging to design. Stratospheric balloons, either stationary or drifting could offer the potential to build a reference database of the dynamical properties in convective clouds. Two concepts will be presented. The first one is a radar on an Infrared Montgolfier Balloon capable of maintaining a flight altitude between 20 and 30 km for up to a few weeks. It is a drifting system transported by the stratospheric circulation in the Tropics for instance. If flown for a long-enough duration, the radar could gather enough measurements to build a database of limited size that could provide reference properties of dynamics and microphysics in regions inaccessible to ground-based systems. The second concept is a radar on a stationary stratospheric airship proposed by Thales called Stratobus (https://www.thalesgroup.com/en/worldwide/space/news/whats-stratobus). It targets local properties of convection and would be particularly suitable for long-term monitoring of mountainous regions for instance. The radar would provide unprecedented measurements of the three wind components with a scanning system similar to those proposed in the DYCECT and WIVERN concepts (e.g. Illingworth et al.2018 or Lemaître and Viltard, 2013) but an improved spatial resolution. The system would be much simpler to design, even if a number of challenges still remain. Bibliography: Lemaître Y. and Viltard N., 2013: 3D wind field from spaceborne Doppler radar. SPIE Proceedings Vol. 8889 Illingworth, A. J., Battaglia, et al., 2018: WIVERN: a new satellite concept to provide global in-cloud winds, precipitation and cloud properties. Bull. A. Met. Soc.

Domaines

Météorologie
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Dates et versions

insu-04443967 , version 1 (07-02-2024)

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Audrey Martini, Nicolas Viltard, Peggy Kirstetter, Julien Delanoë. Potential of a radar on a High-Altitude Platform to retrieve Dynamics and Microphysics in convection.. American Geophysical Union, Fall Meeting 2019, Dec 2019, San Francisco, United States. pp.abstract #H13P-1963. ⟨insu-04443967⟩
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