Precipitation and hydrometeorological processes

The earth’s water cycle is an integral part of the climate system. Water vapor takes many pathways through the water cycle, from entering the atmosphere from the oceans and land surface, transport across vast distances interacting with global and regional atmospheric circulation, forming and interacting with clouds and the weather systems that they are contained within, and returning to the surface as precipitation. The pathways by which water enters and leaves the atmosphere, despite its complexity, plays a key role in determining the earth’s radiation balance. Observations suggest that the representation of cloud and precipitation processes and surface-atmosphere exchanges of water are poorly represented on weather and climate models. The hydrometeorologist is interdisciplinary and bridges the important gap between climate, weather, and hydrology to improve our understanding of how societally important phenomena such as floods, droughts, and impacts on society and ecosystems are impacted on weather timescales, and with variability of climate in the future.

Students in DAS confront the grand research challenge to improve the understanding of precipitation and hydrometeorological processes so we can improve the prediction of weather and climate. Students in DAS participate in field campaigns across the globe to collect measurements of precipitation using advanced techniques, not just rain gauges. These techniques include remote sensing retrievals from advanced dual-polarization radars and microwave radiometers, and aircraft microphysics probes and disdrometers that measure particle size distributions to understand the physics of precipitation. We also use aircraft and surface observations to understand the flows of water from the surface into the atmospheric circulation, including in situ measurements of soil moisture, streamflow, ecosystem characteristics and physics, and fluxes of energy and water at the surface. Satellite data and atmospheric reanalysis also plays a key role in understanding the flows of water vapor through the earth system as well as cloud and precipitation processes, but these must be validated using observations we collect as well as detailed process-oriented model studies. Students in this area also gain experience using state-of-the-art modeling systems to evaluate the representation of water-cloud-precipitation-hydrologic processes in weather systems and the climate system.

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Precipitation and Hydrometeorological Processes
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