Precipitation All water enters the land phase of the hydrologic cycle as precipitation. Thus in order to assess, predict and forecast hydrologic responses.

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Presentation transcript:

Precipitation All water enters the land phase of the hydrologic cycle as precipitation. Thus in order to assess, predict and forecast hydrologic responses hydrologists need to understand how the amount, duration, rate and quality of precipitation are distributed in time and space.

Water Vapor in the Atmosphere The atmosphere a critical pathway in the hydrologic cycle The transport and distribution of water vapor in the atmosphere controls precipitation and evaporation which in turn determine soil and groundwater storage and runoff

Ralph, F. M. , P. J. Neiman, G. A. Wick, S. I. Gutman, M. D Ralph, F. M., P. J. Neiman, G. A. Wick, S. I. Gutman, M. D. Dettinger, D. R. Cayan, and A. B. White (2006), Flooding on California's Russian River: Role of atmospheric rivers, Geophys. Res. Lett., 33, L13801, doi:10.1029/2006GL026689.

Learning objectives Describe the physical processes involved in the formation of precipitation Identify and describe the meteorological patterns that give rise to precipitation in different parts of the world Reading Dingman Chapter 4

Meteorology of Precipitation Precipitation requires Cooling to below dew point Condensation nuclei Drop growth Primary cooling mechanism is uplift Precipitation amounts frequently larger than precipitable water Requirement for supply of water vapor Convergence and uplift Weather systems Extratropical cyclone/frontal system Intertropical convergence zone Hurricane Convection (Thunderstorms) following surface heating. Orography

From Dingman, 1994

Seasonal movement of the Earth's global circulation patterns. Pidwirny, M. (2006). "Tropical Weather and Hurricanes". Fundamentals of Physical Geography, 2nd Edition. Viewed 9/22/08. http://www.physicalgeography.net/fundamentals/7u.html

From Brutsaert, 2005

From http://www.physicalgeography.net/fundamentals/7s.html

From Bras, 1990 From Dingman,1994

From Dingman,1994

From http://www.physicalgeography.net/fundamentals/7u.html Hurricane Floyd, September 15, 1999 Graphical model showing a vertical cross-section of the air circulation, clouds, and precipitation associated with a hurricane. From http://www.physicalgeography.net/fundamentals/7u.html

From Bras, 1990

From Brutsaert, 2005

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