Surface Energy Budgets of Arctic Tundra During Growing Season
Surface Energy Budgets of Arctic Tundra During Growing Season
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DOI：
10.1029/2019jd030650
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发表时间：
2019-07-16
影响因子：
4.4
通讯作者：
Wang, Jingfeng
中科院分区：
文献类型：
--
作者：
El Sharif, Husayn;Zhou, Wenbo;Wang, Jingfeng
这项研究分析了永久冻土下的北极苔原内几个监测点的昼夜和季节性地表能量收支的夏季观测结果。在这些地区，潜热通量和感热通量具有相当的强度，并且地热通量在生长期短暂的夏季间隔期间进入地下，导致季节性解冻。最大熵产生（MEP）模型作为表面热通量的输入和参数简约模型进行了测试，用于模拟这些永久冻土下环境的能量预算。 MEP 模型使用净辐射、表面温度和表征热交换表面热惯性的单个参数来估计潜热通量、感热通量和地热通量，这与可获得详细通量数据的五个地点的观测结果非常吻合。 MEP 潜在蒸散量模型再现了 Penman-Monteith 潜在蒸散量模型的估计值，该模型需要至少五个输入气象变量（净辐射、地面热通量、气温、空气湿度和风速）和表面电阻的经验参数。讨论了 MEP 模型在北极监测稀疏地区应用的潜力和挑战，强调了精确测量和限制地热通量的必要性。 通俗易懂的语言摘要 北极永久冻土苔原地区的生长季潜热通量和感热通量几乎相等。持续进入地下层的地面热通量导致顶部永久冻土层的季节性融化。最大能源生产模型准确地估计了北极永久冻土地区地表能量收支的潜热通量、感热通量和地热通量。
This study analyzed summer observations of diurnal and seasonal surface energy budgets across several monitoring sites within the Arctic tundra underlain by permafrost. In these areas, latent and sensible heat fluxes have comparable magnitudes, and ground heat flux enters the subsurface during short summer intervals of the growing period, leading to seasonal thaw. The maximum entropy production (MEP) model was tested as an input and parameter parsimonious model of surface heat fluxes for the simulation of energy budgets of these permafrost-underlain environments. Using net radiation, surface temperature, and a single parameter characterizing the thermal inertia of the heat exchanging surface, the MEP model estimates latent, sensible, and ground heat fluxes that agree closely with observations at five sites for which detailed flux data are available. The MEP potential evapotranspiration model reproduces estimates of the Penman-Monteith potential evapotranspiration model that requires at least five input meteorological variables (net radiation, ground heat flux, air temperature, air humidity, and wind speed) and empirical parameters of surface resistance. The potential and challenges of MEP model application in sparsely monitored areas of the Arctic are discussed, highlighting the need for accurate measurements and constraints of ground heat flux.Plain Language Summary Growing season latent and sensible heat fluxes are nearly equal over the Arctic permafrost tundra regions. Persistent ground heat flux into the subsurface layer leads to seasonal thaw of the top permafrost layer. The maximum energy production model accurately estimates the latent, sensible, and ground heat flux of the surface energy budget of the Arctic permafrost regions.