Discussion


The precipitation interpolation map VS our new model:


We will use the average annual precipitation interpolation map to compare with our new model, since our new model aims to describe a general precipitation pattern, and does not take into account any seasonal effects. In addition, due to the lack of data from the valley system layer, the new model excluded the northwestern tip of B.C., the southern end of Vancouver Island (including Victoria), and the southwestern tip of B.C. mainland (south of Vancouver). The new model is generally very similar to the interpolation map. They both have a dark blue band along mid to south coast, on Queen Charlotte Island, and on Vancouver Island, showing the highest precipitation in those areas. The Okanagan Valley, the Interior Plateau, and the Great Plains which experience the least amount of precipitation, as depicted on the interpolation map, are also modelled as the driest areas in the new model. They are the lightest blue regions on both the interpolation map and the new model. The Okanagan Valley, Interior Plateau receives minimal precipitation due to their rain-shadow location behind the Coast and Cascade Mountains. Whereas the Great Plains in northeastern B.C. lies in the rain-shadow region east of the Rockies. A relatively high precipitation is observed on both the interpolation map and the new model in southeastern B.C., which corresponds to the Columbia Mountains and the Southern Rockies. This region has relatively high precipitation due to orographic uplift of the westerly winds travelling up the mountain slopes. On the interpolation map, it shows up as a bluish band east of the Interior Plateau. And in the new model, the region shows up to the east of Interior Plateau in a distinct blue colour outlining the Southern Rockies. Some differences exist between the interpolation map and the new model. The northern central part and the northwestern tip of B.C. appear to have a higher precipitation in the new model than in the interpolation map. This discrepancy could be due to the fact that we only had very few precipitation data points in those areas, thus giving a pattern not representative of the area. The new model describes the northern central B.C. to have moderate precipitation that increases from west to east, as can be seen in the faint increase in intensity of the blue colour towards the east to the Northern Rockies. This trend is well documented in climate literature (Schaefer, 2001), which further proves the validity of our new model.


Errors and Uncertainty:






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