1Global Institute for Water Security, University of Saskatchewan, 11 Innovation Boulevard, Saskatoon, Canada
2National Hydrology Research Centre, Environment Canada, 11 Innovation Boulevard, Saskatoon, Canada
3Department of Geoscience, University of Calgary, Calgary, Alberta, Canada
4Cold Regions Research Centre, Wilfrid Laurier University, Waterloo, Ontario, Canada
5Centre for Hydrology, University of Saskatchewan, 117 Science Place, Saskatoon, Canada
6Water Resources Branch, Yukon Department of Environment, Whitehorse, Yukon, Canada
Received: 18 May 2016 – Discussion started: 10 Jun 2016
Abstract. This study assesses a filtering procedure on accumulating precipitation gauge measurements and quantifies the effects of bias corrections for wind-induced undercatch across four ecoclimatic regions in western Canada, including the permafrost regions of the subarctic, the Western Cordillera, the boreal forest, and the prairies. The bias corrections increased monthly precipitation by up to 163 % at windy sites with short vegetation and sometimes modified the seasonal precipitation regime, whereas the increases were less than 13 % at sites shielded by forest. On a yearly basis, the increase of total precipitation ranged from 8 to 20 mm (3–4 %) at sites shielded by vegetation and 60 to 384 mm (about 15–34 %) at open sites. In addition, the bias corrections altered the seasonal precipitation patterns at some windy sites with high snow percentage ( > 50 %). This study highlights the need for and importance of precipitation bias corrections at both research sites and operational networks for water balance assessment and the validation of global/regional climate–hydrology models.
Revised: 17 Sep 2016 – Accepted: 23 Sep 2016 – Published: 10 Oct 2016
Pan, X., Yang, D., Li, Y., Barr, A., Helgason, W., Hayashi, M., Marsh, P., Pomeroy, J., and Janowicz, R. J.: Bias corrections of precipitation measurements across experimental sites in different ecoclimatic regions of western Canada, The Cryosphere, 10, 2347-2360, doi:10.5194/tc-10-2347-2016, 2016.