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| Titel |
Reconnoitering the effect of shallow groundwater on land surface temperature and surface energy balance using MODIS and SEBS |
| VerfasserIn |
F. Alkhaier, Z. Su, G. N. Flerchinger |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 7 ; Nr. 16, no. 7 (2012-07-03), S.1833-1844 |
| Datensatznummer |
250013352
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| Publikation (Nr.) |
 copernicus.org/hess-16-1833-2012.pdf |
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| Zusammenfassung |
| The possibility of observing shallow groundwater depth and areal extent
using satellite measurements can support groundwater models and vast
irrigation systems management. Moreover, these measurements can help to
include the effect of shallow groundwater on surface energy balance within
land surface models and climate studies, which broadens the methods that
yield more reliable and informative results. To examine the capacity of
MODIS in detecting the effect of shallow groundwater on land surface
temperature and the surface energy balance in an area within Al-Balikh River
basin in northern Syria, we studied the interrelationship between in-situ
measured water table depths and land surface temperatures measured by MODIS.
We, also, used the Surface Energy Balance System (SEBS) to calculate surface
energy fluxes, evaporative fraction and daily evaporation, and inspected
their relationships with water table depths. We found out that the daytime
temperature increased while the nighttime temperature decreased when the
depth of the water table increased. And, when the water table depth
increased, net radiation, latent and ground heat fluxes, evaporative
fraction and daily evaporation decreased, while sensible heat flux
increased. This concords with the findings of a companion paper (Alkhaier et
al., 2012). The observed clear relationships were the result of meeting both
conditions that were concluded in the companion paper, i.e. high potential
evaporation and big contrast in day-night temperature. Moreover, the
prevailing conditions in this study area helped SEBS to yield accurate
estimates. Under bare soil conditions and under the prevailing weather
conditions, we conclude that MODIS is suitable for detecting the effect of
shallow groundwater because it has proper imaging times and adequate
sensor accuracy; nevertheless, its coarse spatial resolution is disadvantageous. |
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