Spatial and Temporal Shifts in Historic and Future Temperature and Precipitation Patterns Related to Snow Accumulation and Melt Regimes in Alberta, Canada

Water

BrandiW. Newton¹  JohnF. Orwin¹  Babak Farjad² 

[1] Airshed and Watershed Stewardship Branch, Resource Stewardship Division, Alberta Environment and Parks, 3535 Research Road NW, Calgary, AB T2L 2K8, Canada;Environmental Knowledge and Prediction Branch, Resource Stewardship Division, Alberta Environment and Parks, 3535 Research Road NW, Calgary, AB T2L 2K8, Canada;

关键词: climate change;    winter climate;    future projections;    Alberta;    Rocky Mountains;    freshwater availability;   

DOI  :  10.3390/w13081013

来源: DOAJ

【 摘 要 】

Shifts in winter temperature and precipitation patterns can profoundly affect snow accumulation and melt regimes. These shifts have varying impacts on local to large-scale hydro-ecological systems and freshwater distribution, especially in cold regions with high hydroclimatic heterogeneity. We evaluate winter climate changes in the six ecozones (Mountains, Foothills, Prairie, Parkland, Boreal, and Taiga) in Alberta, Canada, and identify regions of elevated susceptibility to change. Evaluation of historic trends and future changes in winter climate use high-resolution (~10 km) gridded data for 1950–2017 and projections for the 2050s (2041–2070) and 2080s (2071–2100) under medium (RCP 4.5) and high (RCP 8.5) emissions scenarios. Results indicate continued declines in winter duration and earlier onset of spring above-freezing temperatures from historic through future periods, with greater changes in Prairie and Mountain ecozones, and extremely short or nonexistent winter durations in future climatologies. Decreases in November–April precipitation and a shift from snow to rain dominate the historic period. Future scenarios suggest winter precipitation increases are expected to predominantly fall as rain. Additionally, shifts in precipitation distributions are likely to lead to historically-rare, high-precipitation extreme events becoming more common. This study increases our understanding of historic trends and projected future change effects on winter snowpack-related climate and can be used inform adaptive water resource management strategies.

【 授权许可】

Unknown