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HS7.6/AS1.10/NP10.3

Precipitation variability: from drop scale to lot scale (co-organized)PICO session
Convener: Auguste Gires  | Co-Conveners: Remko Uijlenhoet , Alexis Berne , Hidde Leijnse , Katharina Lengfeld 
PICOs
 / Tue, 25 Apr, 13:30–15:00  / PICO spot A
The understanding of small scale spatio-temporal variability of precipitation from seconds in time and drop scale in space to 5 minutes in time and 1 km in space is essential for larger scale studies, including more and more hydrological applications, especially in highly heterogeneous areas (mountains, cities). Nevertheless grasping this variability remains an open challenge. An illustration of the range of scales involved is the ratio between the effective sampling areas of the commonly used point measurement devices (rain gauges and disdrometers) and weather radars, which is greater than 10^7! This session will bring together scientists and practitioners that aim at bridging this scale gap and improving the understanding of small scale precipitation variability, both liquid and solid, as well as its consequences at larger scales.
Contributions addressing one or several of the following issues are especially targeted:
- Novel measurement devices, combinations of devices (both in situ and remote sensors), or experimental set ups enabling to grasp small scale precipitation variability;
- Novel modelling or characterization tools of small scale precipitation variability relying on a wide range of approaches (e.g. scaling, (multi-)fractal, statistic, deterministic, numerical modelling);
- Precipitation drop (or particle) size distribution and its small scale variability, including its consequences for rain rate retrieval algorithms for radars and other remote sensors;
- Physical processes leading to the small-scale rainfall variability
- Examples of hydrological applications where small scale precipitation variability input is required.

This session will adopt the innovative PICO format, which is designed to enhance scientific exchanges. Each author gives a 2-minute oral talk before an interactive poster type presentation with an individual dedicated touch screen.