December 21st to March 19th March 20th to June 19th June 20th to September 21st September 22nd to December 20th
Annual Daily PrecipitaionVS. New Precipitation Model
Kriging Precipitation ModelVS.New Precipitation Model
By taking the kriging method, the precipitation data are interpolated on the DEM of BC. A continuous surface of precipitation level is created from this method, and different levels of precipitation are represented by different values of the blue colour, such as the dark blue represents the high precipitation rate and the light blue represents the low precipitation rate. Interesting, the average annual precipitation map looks very similar to the winter solstices (Dec Mar) precipitation map. Both of these maps have a dark blue band along the coast and light blue colour elsewhere. The widespread moderate blue colour on the summer solstices (June Sept) precipitation map indicates a moderate precipitation rate across the province. The other two seasonal precipitation maps, the spring (Mar June) and the fall (Sept Dec) solstices maps, look somewhat similar to the average annual precipitation map; however, their interior and northeast part of BC appear to be in a more darker blue colour --- perhaps, their precipitation levels are higher than the average annual precipitation levels. During the process of generating the new model, we have created raster maps for each of the four parameters: the aspect, elevation, valley system and the distance from the coast. On the aspect map, the green and pink colours depict the traces of valleys and mountains. Apparently more pixels are shown in the pink colour, which means most of the features are east facing. On the elevation map, the different values of black represent the various elevation level of the province. On the distance from coast map, buffers are created from the coast at a distance of 200km (or at the multiples of 200km), and the buffers change from the dark blue colour along the coast to the light blue colour on the east side of the province. The changing values of the colour indicate the impact of the coast on the precipitation level decreases as the distance from the coast increases. We have also generated two valley system maps, one is the micro-scale of the valley system, and the other one is the marco-scale of the valley system. As shown on these two maps, the larger valleys are concentrated at the central and the northeast part of the province, whereas the small valleys are located elsewhere. The new model we have generated is generally having a moderate level of precipitation across the province, with a lower precipitation level on the valleys and a higher precipitation level along the coast.