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| Titel |
Spatial and seasonal variations in evapotranspiration over Canada's landmass |
| VerfasserIn |
S. Wang, Y. Yang, Y. Luo, A. Rivera |
| 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 ; 17, no. 9 ; Nr. 17, no. 9 (2013-09-23), S.3561-3575 |
| Datensatznummer |
250085932
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| Publikation (Nr.) |
 copernicus.org/hess-17-3561-2013.pdf |
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| Zusammenfassung |
| A 30 yr (1979–2008) dataset of actual evapotranspiration (ET) at 1 km
resolution was generated over Canada's landmass by integrating remote sensing
land surface data and gridded climate data using the EALCO model run at
a 30 min time step. This long-term high-resolution dataset was used to
characterize the spatiotemporal variations in ET across Canada. The results
show that annual ET varied from 600 mm yr−1 over several regions in
the south to less than 100 mm yr−1 in the northern Arctic. Nationally,
ET in summer (i.e., June to August) comprised 65% of the annual total
amount. ET in the cold season remained mostly below 10 mm month−1 over
the country. Negative monthly ET was obtained over the Arctic region in
winter, indicating EALCO simulated a larger amount of condensation than ET.
Overall, the mean ET over the entire Canadian landmass for the 30 yr was
239 mm yr−1, or 44% of its corresponding precipitation.
Comparisons of available ET studies in Canada revealed large uncertainties in
ET estimates associated with using different approaches. The scarcity of ET
measurements for the diverse ecosystems in Canada remains a significant
challenge for reducing the uncertainties; this gap needs to be addressed in
future studies to improve capabilities in climate/weather modeling and water
resource management. |
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