Energy budget measurements using eddy correlation and Bowen ratio techniques at the Kinosheo Lake tower site during the Northern Wetlands Study

摘要: Fluxes of heat and water vapor were measured on a 20-m tower at Kinosheo Lake in the Hudson Bay lowlands using eddy correlation Bowen ratio energy balance techniques. The study period was June 25 to July 28, 1990. Measurements made over peat bog consisting mixture sphagnum moss lichen hummocks black pools. About 200 m west several shallow ponds. had dry, insulating surface underlain by an ice layer near 50 cm depth until mid-July. At beginning pools covered with water, although free gradually disappeared period, they remained saturated end July. about 3 m. Despite under hummocks, their daytime temperatures high, 35°C, after middle July, above 40°C. Inspection temperature, precipitation, radiation data showed that midsummer 1990 warmer, drier, sunnier than usual Moosonee so inference Kinosheo. When all combined yield average diurnal components, fluxes accounted for 90% available energy. Latent flux averaged 46% total sensible 34%. Daytime ratios 1 experimental suggesting behaved more like dryland wetland. Eddy measurements latent less those technique, being 0.81 0.86, respectively. These differences possibly due difficulty measuring components net ground mosaic surface.