What is the Priestley–Taylor wet-surface evaporation parameter? Testing four hypotheses

What is the Priestley–Taylor wet-surface evaporation parameter? Testing four hypotheses. Crago, R. D., Szilagyi, J., & Qualls, R. J. Hydrology and Earth System Sciences, 27(17):3205–3220, September, 2023.

Paper doi abstract bibtex

Abstract. This study compares four different hypotheses regarding the nature of the Priestley–Taylor parameter α. They are as follows: α is a universal constant. The Bowen ratio (H/LE, where H is the sensible heat flux, and LE is the latent heat flux) for equilibrium (i.e., saturated air column near the surface) evaporation is a constant times the Bowen ratio at minimal advection (Andreas et al., 2013). Minimal advection over a wet surface corresponds to a particular relative humidity value. α is a constant fraction of the difference from the minimum value of 1 to the maximum value of α proposed by Priestley and Taylor (1972). Formulas for α are developed for the last three hypotheses. Weather, radiation, and surface energy flux data from 171 FLUXNET eddy covariance stations were used. The condition LEref/LEp\textgreater 0.90 was taken as the criterion for nearly saturated conditions (where LEref is the reference, and LEp is the apparent potential evaporation rate from the equation by Penman, 1948). Daily and monthly average data from the sites were obtained. All formulations for α include one model parameter which is optimized such that the root mean square error of the target variable was minimized. For each model, separate optimizations were done for predictions of the target variables α, wet-surface evaporation (α multiplied by equilibrium evaporation rate) and actual evaporation (the latter using a highly successful version of the complementary relationship of evaporation). Overall, the second and fourth hypotheses received the best support from the data.

@article{crago_what_2023,
	title = {What is the {Priestley}–{Taylor} wet-surface evaporation parameter? {Testing} four hypotheses},
	volume = {27},
	copyright = {https://creativecommons.org/licenses/by/4.0/},
	issn = {1607-7938},
	shorttitle = {What is the {Priestley}–{Taylor} wet-surface evaporation parameter?},
	url = {https://hess.copernicus.org/articles/27/3205/2023/},
	doi = {10.5194/hess-27-3205-2023},
	abstract = {Abstract. This study compares four different hypotheses regarding the nature
of the Priestley–Taylor parameter α. They are as follows:
 α is a universal constant. The Bowen ratio (H/LE, where H is the sensible heat flux, and LE is
the latent heat flux) for equilibrium (i.e., saturated air column near the
surface) evaporation is a constant times the Bowen ratio at minimal
advection (Andreas et al., 2013). Minimal advection over a wet surface corresponds to a particular relative humidity value. α is a constant fraction of the difference from the minimum value of 1 to the maximum value of α proposed by Priestley and Taylor (1972).
Formulas for α are developed for the last three hypotheses. Weather,
radiation, and surface energy flux data from 171 FLUXNET eddy covariance
stations were used. The condition LEref/LEp{\textgreater} 0.90 was
taken as the criterion for nearly saturated conditions (where LEref is
the reference, and LEp is the apparent potential evaporation rate from the equation by Penman, 1948). Daily and monthly average data from the sites were
obtained. All formulations for α include one model parameter which
is optimized such that the root mean square error of the target variable was
minimized. For each model, separate optimizations were done for predictions
of the target variables α, wet-surface evaporation (α
multiplied by equilibrium evaporation rate) and actual evaporation (the
latter using a highly successful version of the complementary relationship
of evaporation). Overall, the second and fourth hypotheses received the best
support from the data.},
	language = {en},
	number = {17},
	urldate = {2024-11-14},
	journal = {Hydrology and Earth System Sciences},
	author = {Crago, Richard D. and Szilagyi, Jozsef and Qualls, Russell J.},
	month = sep,
	year = {2023},
	pages = {3205--3220},
}

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The Bowen ratio (H/LE, where H is the sensible heat flux, and LE is the latent heat flux) for equilibrium (i.e., saturated air column near the surface) evaporation is a constant times the Bowen ratio at minimal advection (Andreas et al., 2013). Minimal advection over a wet surface corresponds to a particular relative humidity value. α is a constant fraction of the difference from the minimum value of 1 to the maximum value of α proposed by Priestley and Taylor (1972). Formulas for α are developed for the last three hypotheses. Weather, radiation, and surface energy flux data from 171 FLUXNET eddy covariance stations were used. The condition LEref/LEp\\textgreater 0.90 was taken as the criterion for nearly saturated conditions (where LEref is the reference, and LEp is the apparent potential evaporation rate from the equation by Penman, 1948). Daily and monthly average data from the sites were obtained. 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