HS7.6 | PICO

This session addresses two sub-topics: the small scale variability of precipitation, and the atmospheric water cycle. It adopts a PICO format which aims at employing the most modern and captivating environment of scientific exchange (i.e., a 2-minute oral presentation, nicknamed "2-minute madness", followed by an interactive poster presentation on dedicated touch-screens, https://egu2019.eu/guidelines/pico_presenter_guidelines.html).

Precipitation variability: from drop scale to lot scale

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.

The atmospheric water cycle: feedbacks, management, land-use and climate change

Traditionally, hydrologists have always considered precipitation and temperature as input to their models and evaporation as a loss. However, more than half of the evaporation globally comes back as precipitation on land. Land-use changes alter, not only, the local water cycle, but through atmospheric water and energy feedbacks also effect the water cycle in remote locations.
This session aims to:
- show applied studies using fundamental characteristics of the atmospheric branch of the hydrologic cycle on different scales. These fundamentals include, but are not limited to, atmospheric circulation, humidity, residence times, recycling ratios, sources and sinks of atmospheric moisture, energy balance and climatic extremes.
- investigate the remote and local atmospheric feedbacks from human interventions such as irrigation and deforestation on the water cycle, precipitation and climate, based on observations and coupled modelling approaches.
- explore the implications of atmospheric feedbacks on the hydrologic cycle for land and water management. Can we favourably alter atmospheric hydrology and precipitation by means of ground based interventions of changing land cover, and thus changing evaporation, albedo and surface roughness?

Co-organized as AS4.23/NP3.4
Convener: Auguste Gires | Co-conveners: Ruud van der Ent, Remko Uijlenhoet, Katharina Lengfeld, Lan Wang-Erlandsson
| Mon, 08 Apr, 08:30–10:15
PICO spot 4

Monday, 8 April 2019

PICO spot 4
Chairperson: Auguste Gires and Ruud van der Ent
Precipitation variability from drop scale to lot scale
08:30–08:32 |
PICO4.1 |
Paolo Burlando, Nadav Peleg, Simone Fatichi, Peter Molnar, Efrat Morin, Ashish Sharma, and Francesco Marra
08:32–08:34 |
PICO4.2 |
Sora Park, Kwang Deuk Ahn, and Yong Hee Lee
08:34–08:36 |
PICO4.3 |
Laura Varga and Mark Honti
08:36–08:38 |
PICO4.4 |
Judith Lorenz, Rico Kronenberg, Donkyun Kim, and Christian Bernhofer
08:38–08:40 |
PICO4.5 |
Lionel Benoit, Mathieu Vrac, and Gregoire Mariethoz
08:40–08:42 |
PICO4.6 |
Lisbeth Lolk Johannsen, Nives Balenovic, Peter Strauss, Tomas Dostal, Martin Neumann, David Zumr, Thomas Cochrane, and Andreas Klik
08:42–08:44 |
PICO4.7 |
Scientific basis to improve the accuracy of advection and radiation fogs forecast
Jose Luis Sanchez, Pablo Melcon, Andres Merino, Eduardo García-Ortega, Jose Luis Marcos, Guillermo Merida, Javier Diaz-Fernandez, Francisco Valero, Sergio Fernandez-Gonzalez, Maria Luisa Martin, Pedro Bolgiani, and Laura Sanchez-Muñoz
08:44–08:46 |
PICO4.8 |
Taeyong Kwon, Junghyun Lim, and Sanghoo Yoon
Atmospheric water cycle: feedbacks, management and land-use change
08:48–08:50 |
PICO4.10 |
| solicited
Arie Staal, Obbe Tuinenburg, Joyce Bosmans, Milena Holmgren, Egbert van Nes, Marten Scheffer, Delphine Clara Zemp, and Stefan Dekker
08:50–08:52 |
PICO4.11 |
Andreas Link, Markus Berger, Ruud van der Ent, Stephanie Eisner, and Matthias Finkbeiner
08:54–08:56 |
PICO4.13 |
Agnes Pranindita, Ryan Teuling, Lan Wang-Erlandsson, and Ingo Fetzer
08:56–08:58 |
PICO4.14 |
Roland Vogt, Robert Spirig, Christian Feigenwinter, and Andreas Wicki
08:58–09:00 |
PICO4.15 |
Stefania Stevenazzi, Marco Masetti, Corrado Camera, Massimo Tiepolo, Elena Silvia Ferrari, and Roberto Sergio Azzoni