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| Titel |
Diagnosing the seasonal land–atmosphere correspondence over northern Australia: dependence on soil moisture state and correspondence strength definition |
| VerfasserIn |
M. Decker, A. Pitman, J. Evans |
| 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 ; 19, no. 8 ; Nr. 19, no. 8 (2015-08-06), S.3433-3447 |
| Datensatznummer |
250120781
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| Publikation (Nr.) |
 copernicus.org/hess-19-3433-2015.pdf |
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| Zusammenfassung |
| The similarity of the temporal variations of land and atmospheric states
during the onset (September) through to the peak (February) of the wet season
over northern Australia is statistically diagnosed using ensembles of offline
land surface model simulations that produce a range of different background
soil moisture states. We derive the temporal correspondence between
variations in the soil moisture and the planetary boundary layer via a
statistical measure of rank correlation. The simulated evaporative fraction
and the boundary layer are shown to be strongly correlated during both SON
(September–October–November) and DJF (December–January–February) despite
the differing background soil moisture states between the two seasons and
among the ensemble members. The sign and magnitude of the boundary
layer–surface layer soil moisture association during the onset of the wet
season (SON) differs from the correlation between the evaporative fraction
and boundary layer from the same season, and from the correlation between the
surface soil moisture and boundary layer association during DJF. The patterns
and magnitude of the surface flux–boundary layer correspondence are not
captured when the relationship is diagnosed using the surface layer soil
moisture alone. The conflicting results arise because the surface layer soil
moisture lacks strong correlation with the atmosphere during the monsoon
onset because the evapotranspiration is dominated by transpiration. Our
results indicate that accurately diagnosing the correspondence and therefore
coupling strength in seasonally dry regions, such as northern Australia,
requires root zone soil moisture to be included. |
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