Climate Dynamics 11:670:461 Alan Robock

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Presentation transcript:

Climate Dynamics 11:670:461 Alan Robock robock@envsci.rutgers.edu Lecture 10, 10/10/13 Climate Dynamics 11:670:461 Alan Robock Department of Environmental Sciences Rutgers University, New Brunswick, New Jersey USA robock@envsci.rutgers.edu http://envsci.rutgers.edu/~robock

The hydrologic cycle – annual water fluxes (1015 kg/yr) Fig. 2.24

Hydrological Cycle Fig. 9.1

Atmospheric column water balance Fig. 9.2

water depth (cm) 50 Total Capacity 35 Field Capacity 15 Wilting Level 1 m GRAVITY AVAILABLE UNAVAILABLE SOIL

Why study soil moisture? 1. Soil moisture affects the surface energy balance and surface temperature by affecting: latent heat flux, and hence sensible heat flux surface albedo 2. Soil moisture affects evaporation and precipitation. Month to month variations of soil moisture are as large as the other terms in the hydrologic balance, namely precipitation, evaporation, and runoff. Perhaps half of all precipitation is recycled water from the land. 3. Hence accurate soil moisture observations are needed for better weather forecasts. Why study soil moisture?

Why study soil moisture? 4. Soil moisture affects runoff, and hence the thermohaline circulation of the ocean. 5. Soil moisture is the source of water for agricultural and natural vegetation. 6. Drought is a soil moisture deficiency. 7. Flooding is a soil moisture excess. 8. Soil moisture is the most important component of memory for the climate system over the land, and hence correct observation and modeling of soil moisture will lead to improved seasonal forecasts.

Soil moisture observations in Mongolia, 1999

Boissy-le-Châtel Hydrological station in the Orgeval catchment of the Seine Basin at 48.8°N, 3.1°E. Twice daily soil moisture reading at 11 levels, from November 1996 - present Uses TDR probe to measure soil moisture, which is calibrated with gravimetric readings. (cm)

Ukraine: Now updated through 2004 Russia: Now being updated through 2003 India: Now updated through 1999 Mongolia: Now updated through 2003 China: Now updated through 1999 Data have been transitioned to the International Soil Moisture Network, http://ismn.geo.tuwien.ac.at/ismn/

Eurasian soil moisture data available at the International Soil Moisture Network, http://ismn.geo.tuwien.ac.at/ismn/

U.S. soil moisture data available at the International Soil Moisture Network, http://ismn.geo.tuwien.ac.at/ismn/

ARM/CART Mesonet Mesonet with soil moisture and soil temperature observations In addition, the Oklahoma Mesonet has more than 100 stations. All now include soil moisture observations.