NDLI: On the Application of the Priestley–Taylor Relation on Sub-daily Time Scales

Content Provider	Springer Nature Link
Author	Guo, Xiaofeng Liu, Heping Yang, Kun
Copyright Year	2015
Abstract	Based on observations over a reservoir and a glacier, we investigate the sub-daily variations in the Priestley–Taylor parameter $$\alpha $$ for saturated surfaces. According to the sign of the eddy-covariance fluxes of sensible heat $$(H)$$ and latent heat $$(LE)$$ (positive and negative for upward and downward transfer, respectively), measurements are organized into three heat-flux regimes. In regimes I $$(H>0;\, LE>0)$$ and II $$(H<0;\, LE>0)$$ over the water, 30-min retrievals of $$\alpha $$ vary within the ranges of 1.00–1.32 and 1.24–2.04, respectively, and over glacial ice/snow surfaces, $$\alpha $$ appears more variable: $$\alpha <-0.10$$ and $$\alpha >1.70$$ in regime II, and $$0.08<\alpha <1.0$$ in regime III $$(H<0;\, LE<0)$$ . Such variations in $$\alpha $$ have practical implications for the application of the Priestley–Taylor relation on a sub-daily time scale. When adopted for estimating latent heat fluxes over this reservoir, the rule-of-thumb $$\alpha $$ value of 1.26 leads to overestimates and underestimates in regimes I and II, respectively. Moreover, despite adopting locally calibrated $$\alpha $$ values over the ice/snow surfaces, the Priestley–Taylor relation is found to produce significant errors in both regimes II and III, and thus is considered largely inapplicable for reliable estimations of sublimation and deposition.
Starting Page	489
Ending Page	499
Page Count	11
File Format	PDF
ISSN	00068314
Journal	Boundary-Layer Meteorology
Volume Number	156
Issue Number	3
e-ISSN	15731472
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-05-03
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Evaporation Priestley–Taylor relation Sublimation and deposition Water, ice, and snow Water resources Atmospheric Sciences Meteorology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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