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| Titel |
Impacts of inhomogeneous landscapes in oasis interior on the oasis self-maintenance mechanism by integrating numerical model with satellite data |
| VerfasserIn |
X. Meng, S. Lu, T. Zhang, Y. Ao, S. Li, Y. Bao, L. Wen, S. Luo |
| 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. 10 ; Nr. 16, no. 10 (2012-10-22), S.3729-3738 |
| Datensatznummer |
250013525
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| Publikation (Nr.) |
 copernicus.org/hess-16-3729-2012.pdf |
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| Zusammenfassung |
| The impacts of inhomogeneity of the oasis interior on the oasis
self-maintenance mechanism are investigated by using the mesoscale model MM5
(the fifth-generation Pennsylvania State University National Center for Atmospheric Research (NCAR) mesoscale model) with satellite
observations of land use types, vegetation fraction and surface-layer soil
moisture from MODIS (Moderate Resolution Imaging Spectroradiometer) data.
Four simulations were performed, among which the CTL (control simulation)
and MOD (moderated simulation with parameters replaced by MODIS data) were used to validate the
model results; EXP1 (experiment 1) and EXP2 (experiment 2) were designed
to study the inhomogeneity of oasis interior. Results show that the changes
of oasis heterogeneity influence the surface heat-flux partitioning, which
leads to a larger "cold-wet" effect over the oasis. Vertical sections of
humidity illustrate the existence of a moisture-inversion level, and the
deeper moisture inversion of EXP1 and EXP2 further indicates that the
relative homogeneity in the oasis interior helps produce stronger humidity
inversion over the oasis, thus limiting evaporation. This is further
verified by the analysis of the secondary circulation, which shows that the
more homogeneous land surface conditions lead to stronger secondary
circulation and less turbulent drafts over the oasis interior, playing a
positive role in the oasis self-maintenance and development. |
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