The complementary relationship in estimation of regional evapotranspiration: An enhanced advection‐aridity model
The complementary relationship in estimation of regional evapotranspiration: An enhanced advection‐aridity model
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DOI：
10.1029/2000wr900359
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发表时间：
2001-05
影响因子：
5.4
通讯作者：
M. Hobbins;J. Ramirez;T. Brown
中科院分区：
文献类型：
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作者：
M. Hobbins;J. Ramirez;T. Brown
将Brutsaert和Strieker的平流干旱模型的长期月蒸散量估计值与美国境内139个未受干扰流域的长期水平衡得出的蒸散量独立估计值进行了比较。在1962-1988年期间的平均每年的基础上，原来的模型，它使用彭曼风函数，低估了蒸散量的7.9%的降水量相比，水平衡的估计。模型的准确性增加与盆湿度。提出了一种改进的模型公式，其中风函数和Priestley-Taylor系数被修改。风函数重新参数化的季节，区域的基础上复制独立的代理潜在蒸散表面。这导致了与原始彭曼风函数的显着差异。重新参数化的风函数，以及重新校准的Priestley-Taylor系数在湿环境蒸散公式，减少了年平均蒸散的低估，只有1.15%的降水量的一组独立的验证流域。这里提供的结果进一步支持Bouchet的假设，因为它适用于大规模，长期蒸散。
Long‐term monthly evapotranspiration estimates from Brutsaert and Strieker's Advection‐Aridity model were compared with independent estimates of evapotranspiration derived from long‐term water balances for 139 undisturbed basins across the conterminous United States. On an average annual basis for the period 1962–1988 the original model, which uses a Penman wind function, underestimated evapotranspiration by 7.9% of precipitation compared with the water balance estimates. Model accuracy increased with basin humidity. An improved formulation of the model is presented in which the wind function and the Priestley‐Taylor coefficient are modified. The wind function was reparameterized on a seasonal, regional basis to replicate independent proxy potential evapotranspiration surfaces. This led to significant differences from the original Penman wind function. The reparameterized wind function, together with a recalibrated Priestley‐Taylor coefficient in the wet environment evapotranspiration formulation, reduced the underestimation of annual average evapotranspiration to only 1.15% of precipitation on an independent set of validation basins. The results offered here lend further support for Bouchet's hypothesis as it applies to large‐scale, long‐term evapotranspiration.