期刊
WATER RESOURCES RESEARCH
卷 46, 期 -, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2009WR008726
关键词
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资金
- National Science Foundation [AGS-0838491, EAR-0126241, EAR-0636110, EAR-0345440, ATM-0339527]
- Army Research Office [43857-EV]
- David and Lucile Packard Foundation [951832]
- Laboratory Directed Research and Development
- United States Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [0838491] Funding Source: National Science Foundation
[1] Fast neutrons are generated naturally at the land surface by energetic cosmic rays. These background neutrons respond strongly to the presence of water at or near the land surface and represent a hitherto elusive intermediate spatial scale of observation that is ideal for land surface studies and modeling. Soil moisture, snow, and biomass each have a distinct influence on the spectrum, height profile, and directional intensity of neutron fluxes above the ground, suggesting that different sources of water at the land surface can be distinguished with neutron data alone. Measurements can be taken at fixed sites for long-term monitoring or in a moving vehicle for mapping over large areas. We anticipate applications in many previously problematic contexts, including saline environments, wetlands and peat bogs, rocky soils, the active layer of permafrost, and water and snow intercepted by vegetation, as well as calibration and validation of data from spaceborne sensors.
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