| Title | Trends in land evapotranspiration over Canada for the period 1960-2000 based on in-situ climate observations and a land surface model |
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| Author | Fernandes, R ;
Korolevych, V; Wang, S |
| Source | Journal of Hydrometeorology vol. 8, 2007 p. 1016-1030, https://doi.org/10.1175/jhm619.1  Open Access |
| Image |  |
| Year | 2007 |
| Alt Series | Earth Sciences Sector, Contribution Series 20060152 |
| Publisher | American Meteorological Society |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | British Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut; Canada |
| NTS | 1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65;
66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560 |
| Area | Canada |
| Lat/Long WENS | -141.0000 -50.0000 90.0000 41.7500 |
| Subjects | evapotranspiration coefficient; meteorology; modelling |
| Illustrations | location maps; histograms; tables |
| Program | Enhancing resilience in a changing climate |
| Released | 2007 10 01 |
| Abstract | An assessment of annual and summertime trends in actual evapotranspiration (ET) and associated climate forcing is performed at 101 locations across Canada with available long term hourly surface climate
observations. ET was estimated for the dominant land cover class, with representative soil and leaf area index conditions, within a 50km x 50km window around each station location for the period 1960-2000. Climate forcing was derived from the
Canadian Weather Energy and Engineering Data Set supplemented by the Canadian Daily Climate Data Set for precipitation and regional observations of atmospheric CO2 concentrations. The EALCO land surface model, that includes consideration of coupled
carbon, energy and water cycles, was applied to estimate ET on a half hourly basis at each climate station. Land surface parameters based on current land cover, leaf area index and soil data sets were used. Application of the Mann-Kendall test to
the dataset suggest generally positive trends in annual ET ranging from 0.2% to 0.76% per year across most of the stations. This trend was generally related to increasing temperatures and solar radiation in Eastern Canada and increasing temperature,
radiation and precipitation in Western Canada. Modelled ET trends increased by 0.01 mm/yr to 0.15 mm/yr when atmospheric CO2 was fixed to the average over the 1960-2000 period rather than based on observed values. Statistically significant trends
were detected in 35% of the stations for both annual and summer periods with the majority corresponding to Atlantic and Pacific coastal regions rather than the Prairies. Sensitivity analysis of modeled trends to sub-50km soil parameter variability
found that up to 53% of the stations could result in statistically significant positive ET trends if sub-dominant soil conditions were used. Future studies focused on scaling of these results to complete watersheds are required both to account for
this spatial variability in soil conditions and to permit water budget closure validation. |
| GEOSCAN ID | 222601 |
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