The influence of surface cover and climate on energy partitioning and evaporation in a subarctic wetland

摘要: Energy partitioning and evaporation were measured over three wetland surfaces in a subarctic coastal marsh during pre-growing growing periods. These included an alder/willow woodland, sedge raised backshore meadow. A combination model analysis was used to assess the relative importance of surface resistance meteorological conditions on magnitude Bowen ratio, Β, period. Overall, experienced important site-to-site seasonal differences Β evaporation, Q E. During non-foliated period, Q E largest smallest for open water marsh, while dry site Β. The woodland assumed intermediate values After vegetation covers established, flux. It also found that at increased with presence cover. Wind direction always factor determining all sites. substantially larger smaller onshore winds (i.e., originating from James Bay) than offshore winds. showed canopy sites warm winds, which associated large saturation deficits. However, effect offset by climatological resistance, resulting small When originated Bay, but much smaller, results have implications changes land cover climate regional balance.