Growing season evapotranspiration in boreal fens in the Athabasca Oil Sands Region: Variability and environmental controls,Hydrological Processes

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Growing season evapotranspiration in boreal fens in the Athabasca Oil Sands Region: Variability and environmental controls
Hydrological Processes ( IF 2.8 ) Pub Date : 2020-12-23 , DOI: 10.1002/hyp.14020
Olena Volik ₁ , Eric Kessel ₁ , Adam Green ₁ , Richard Petrone ₁ , Jonathan Price ₁

Affiliation

Current efforts to assess changes to the wetland hydrology caused by growing anthropogenic pressures in the Athabasca Oil Sands Region (AOSR) require well‐founded spatial and temporal estimates of actual evapotranspiration (ET), which is the dominant component of the water budget in this region. This study assessed growing season (May–September) and peak growing season (July) ET variability at a treed moderate‐rich fen and treed poor fen (in 2013–2018), open poor fen (in 2011–2014), and saline fen (in 2015–2018) using eddy covariance technique and a set of complementary environmental data. Seasonal fluctuations in ET were positively related to net radiation, air temperature and vapour pressure deficit and followed trends typical for the Boreal Plains (BP) and AOSR with highest rates in June–July. However, no strong effect of water table position on ET was found. Strong surface control on ET is evident from lower ET values than potential evapotranspiration (PET); the lowest ET/PET was observed at saline fen, followed by open fen, moderately treed fen, and heavily treed fen, suggesting a strong influence of vegetation on water loss. In most years PET exceeded precipitation (P), and positive relations between P/PET and ET were observed with the highest July ET rates occurring under P/PET ~1. However, during months with P/PET > 1, increased P/PET was associated with decreased July ET. With respect to 30‐year mean values of air temperature and P in the area, both dry and wet, cool and warm growing seasons (GS) were observed. No clear trends between ET values and GS wetness/coldness were found, but all wet GS were characterized by peak growing seasons with high daily ET variability.

中文翻译：

阿萨巴斯卡油砂地区北部的生长季蒸散：变异性和环境控制

目前为评估阿萨巴斯卡油砂地区（AOSR）人为压力增加而引起的湿地水文学变化的工作，需要对实际蒸散量（ET）进行充分的时空估计，这是该地区水预算的主要组成部分。这项研究评估了中度富裕的树木和贫瘠的树木（2013-2018年），开放性较弱的树木（2011-2014年）和生理盐水的生长季节（5月至9月）和生长高峰期（7月）的ET变异性。（在2015–2018年）使用涡度协方差技术和一组补充环境数据。ET的季节性波动与净辐射，气温和蒸气压赤字呈正相关，并遵循6月至7月发生率最高的北方平原（BP）和AOSR的典型趋势。然而，未发现地下水位对ET的强烈影响。从比潜在蒸散量（PET）低的ET值可以看出，对ET的表面控制很强。最低的ET / PET在盐水saline中观察到，其次是开放，中树，和重树，表明植被对失水有很强的影响。在大多数年份，PET超过降水量（P），并且P / PET与ET之间存在正相关，在P / PET〜1下发生的7月ET发生率最高。但是，在P / PET> 1的月份中，P / PET升高与7月ET降低有关。关于该地区30年的平均气温和P值，观测到了干燥和潮湿，凉爽和温暖的生长季节（GS）。在ET值和GS湿度/寒冷之间未发现明显趋势，

更新日期：2021-02-11

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