Synoptic controls on the surface energy and water budgets in sub‐arctic regions of Canada

摘要: An objective hybrid classification of daily surface weather maps for central and western Canadian sub-arctic locations was used to determine their dominant synoptic conditions during the snow free period. This yielded seven types each location snowmelt snow-free periods (20 April-7 September), accounting 90% days in The effects source regions were explain observed air mass characteristics, influence on respective study locations. Cooler, drier masses most frequent at both Arctic high pressure cells northeast brought coolest site, Trail Valley Creek (TVC), Northwest Territories, while systems approaching from northwest Churchill, Manitoba. Sub-tropical west-southwest warm TVC, whereas stationary south warmed Churchill. These regimes exerted strong controls precipitation evaporation components water balance as terms cloud cover, radiation efficiencies.