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TitleA national-scale assessment of long-term water budget closures for Canada's watersheds
AuthorWang, S; McKenney, D W; Shang, J L; Li, J
SourceJournal of Geophysical Research, D, Atmospheres vol. 119, no. 14, 2014 p. 8712-8725, https://doi.org/10.1002/2014JD021951
Year2014
Alt SeriesEarth Sciences Sector, Contribution Series 20130428
PublisherAmerican Geophysical Union
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceBritish Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut
NTS1; 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
Subjectsgeophysics; hydrogeology; groundwater; groundwater flow; groundwater resources; groundwater movement; groundwater regimes; hydrologic budget; watersheds; surface waters
Illustrationslocation maps; tables; plots
ProgramAquifer Assessment & support to mapping, Groundwater Geoscience
AbstractThis study examined the long-term water budget closures for 370 watersheds over Canada's landmass by using 30 years' (1981-2010) data products recently produced for precipitation (P) gridded using climate station measurements, land surface evapotranspiration (ET), and water surface evaporation (E0) obtained by the Ecological Assimilation of Land and Climate Observations (EALCO) model, and observed streamflow (Q). The results show that 29%, 58%, and 83% of the watersheds were closed within 5%, 10%, and 20% of P, respectively. The positive and negative imbalances among the 370 watersheds are largely offset and the national scale average is\'0124mmyr\'011, or 4.2% of P. Water budget closures have large variation across the landmass. Regions with sparse or less accurate monitoring of P such as the mountainous region and the Arctic exhibit the largest water imbalances. Further efforts on enhancing the climate observation networks, improving spatial models for P and ET estimates, and streamflow measurements are all likely critical for a better understanding of Canada's water budgets.
Summary(Plain Language Summary, not published)
A water budget is the quantitative accounting of the amount of water entering, stored within, and leaving a hydrologic system. To better understand implications of climate change and to provide improved ability to manage water resources requires improved information on water budgets. This study examines the national scale long-term water budget for Canada¿s landmass by using state-of-the-art data products from remote sensing, modelling, and in situ measurements. This research relies on the CCMEO/ESS EALCO model ¿ an international leading model for EO applications in natural resources mapping and assessment. The new technology developed in this study advances the EO applications in large scale water mapping. The results filled knowledge gaps in water resources accounting, quantified the uncertainties in the current water datasets, and provided future directions for improving the water layers for Canada.
GEOSCAN ID293558