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Communication Dans Un Congrès Année : 2020

Potential of Doppler radar on a stratospheric platform for dynamical studies.

Audrey Martini
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Nicolas Viltard
Julien Delanoë
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Résumé

High Altitude Platforms 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 their area of deployment and space-based instruments providing a 3D sampling are particularly challenging to design. Stratospheric balloons could offer some very interesting possibilities to build a reference database of the dynamical properties of convective clouds. In the case of radar, this is a particularly interesting prospect because a platform at an altitude of 20 km offers power performances close to that of a ground system. Likewise, the possible speed of displacement of the platform is in order of magnitude close to the sought-after Doppler shifts. The main disadvantage of drifting balloons is their random trajectory (to a certain extent) and in the fact that in the upper part of the tropopause or in the lower stratosphere, the currents are rather divergent from the convective cores which could tend to move the instrument away from the most intense events.In the tropics, an altitude of 20 km is probably not optimal since deep convective systems will influence the trajectory due to the divergence at the top of the towers which will repel the balloon. However, a balloon flying at an altitude of 20 km will still be able to observe significant convective activity. Two concepts are being studied. The first one is a radar on an Open Stratospheric Ballons in order to follow events (squall lines) over short durations. The second one is a radar on a Pressurised Stratospheric Balloon , capable of staying between 20 and 30 km altitude for up to a few weeks. It is a free-moving system caught up in 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. This would also complement and validate satellite measurements (EarthCare, Aeolus) on critical areas for which there are no measurements. A rapid study showed encouraging results for tracking the flight of a Pressurised Stratospheric Balloon (PSB) in the tropics.
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Dates et versions

insu-04453984 , version 1 (12-02-2024)

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Audrey Martini, Nicolas Viltard, P. E. Kirstetter, Julien Delanoë. Potential of Doppler radar on a stratospheric platform for dynamical studies.. American Geophysical Union, Fall Meeting 2020, Dec 2020, Online, Unknown Region. pp.abstract #A217-0003. ⟨insu-04453984⟩
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