A catchment water balance assessment of an abrupt shift in evapotranspiration at the Hubbard Brook Experimental Forest, New Hampshire, USA
A catchment water balance assessment of an abrupt shift in evapotranspiration at the Hubbard Brook Experimental Forest, New Hampshire, USA
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DOI：
10.1002/hyp.14300
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发表时间：
2021-07
影响因子：
3.2
通讯作者：
M. Green;S. Bailey;J. Campbell;K. McGuire;A. Bailey;T. Fahey;Nina K. Lany;D. Zietlow
中科院分区：
文献类型：
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作者：
M. Green;S. Bailey;J. Campbell;K. McGuire;A. Bailey;T. Fahey;Nina K. Lany;D. Zietlow
小型流域是森林生态系统应对空气质量和气候变化的哨兵。自 1956 年以来，新罕布什尔州的哈伯德布鲁克实验森林一直在跟踪流域水预算及其控制（气象和植被）。从 2010 年开始一直持续到 2019 年，四个参考流域的水预算表明，根据降水量 (P) 和径流 (RO) 之间的差异估计，蒸散量 (ET) 增加了约 30%。我们分析了年度水预算、每日 P、RO 的累积偏差和水预算残差(WBR = P − RO)、潜在蒸散量 (PET) 和地下储存指标，以更深入地了解水预算的这种变化。 PET 和地下储存指标表明 WBR 的这种变化主要是由于 ET 的增加。虽然使用多个长期水文和微气象数据集来检测和研究蒸散的变化，但对地下水储存和土壤湿度的额外测量将能够更好地估计流域水平衡内的蒸散。扩大小型流域的长期测量范围，使它们能够成为重大水文变化（例如我们观察到的蒸散增加）的更有效的哨兵。
Small catchments have served as sentinels of forest ecosystem responses to changes in air quality and climate. The Hubbard Brook Experimental Forest in New Hampshire has been tracking catchment water budgets and their controls – meteorology and vegetation – since 1956. Water budgets in four reference catchments indicated an approximately 30% increase in the evapotranspiration (ET) as estimated by the difference between precipitation (P) and runoff (RO) starting in 2010 and continuing through 2019. We analyzed the annual water budgets, cumulative deviations of the daily P, RO and water budget residual (WBR = P − RO), potential ET (PET) and indicators of subsurface storage to gain greater insight into this shift in the water budgets. The PET and the subsurface storage indicators suggest that this change in WBR was primarily due to increasing ET. While multiple long‐term hydrological and micrometeorological data sets were used to detect and investigate this change in ET, additional measurements of groundwater storage and soil moisture would enable better estimation of ET within the catchment water balance. Increasing the breadth of long‐term measurements across small gauged catchments allows them to serve as more effective sentinels of substantial hydrologic changes like the ET increase that we observed.