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Canopy Resistance and Estimation of Evapotranspiration above a Humid Cypress Forest
Joint Authors
Lin, Bau-Show
Lei, Huimin
Hu, Ming-Che
Visessri, Supattra
Hsieh, Cheng-I
Source
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-16, 16 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-01-04
Country of Publication
Egypt
No. of Pages
16
Main Subjects
Abstract EN
This study presented a two-year data set of sensible heat and water vapor fluxes above a humid subtropical montane Cypress forest, located at 1650 m a.s.l.
in northeastern Taiwan.
The focuses of this study were to investigate (1) the diurnal and seasonal variations of canopy resistance and fluxes of sensible heat and water vapor above this forest; and (2) the mechanism of why a fixed canopy resistance could work when implementing the Penman–Monteith equation for diurnal hourly evapotranspiration estimation.
Our results showed distinct seasonal variations in canopy resistance and water vapor flux, but on the contrary, the sensible heat flux did not change as much as the water vapor flux did with seasons.
The seasonal variation patterns of the canopy resistance and water vapor flux were highly coupled with the meteorological factors.
Also, the results demonstrated that a constant (fixed) canopy resistance was good enough for estimating the diurnal variation of evapotranspiration using Penman–Monteith equation.
We observed a canopy resistance around 190 (s/m) for both the two warm seasons; and canopy resistances were around 670 and 320 (s/m) for the two cool seasons, respectively.
In addition, our analytical analyses demonstrated that when the average canopy resistance is higher than 200 (s/m), the Penman–Monteith equation is less sensitive to the change of canopy resistance; hence, a fixed canopy resistance is suitable for the diurnal hourly evapotranspiration estimation.
However, this is not the case when the average canopy resistance is less than 100 (s/m), and variable canopy resistances are needed.
These two constraints (200 and 100) were obtained based on purely analytical analyses under a moderate meteorological condition (Rn = 600 W·m−2, RH = 60%, Ta = 20°C, U = 2 m·s−1) and a measurement height around two times of the canopy height.
American Psychological Association (APA)
Lin, Bau-Show& Lei, Huimin& Hu, Ming-Che& Visessri, Supattra& Hsieh, Cheng-I. 2020. Canopy Resistance and Estimation of Evapotranspiration above a Humid Cypress Forest. Advances in Meteorology،Vol. 2020, no. 2020, pp.1-16.
https://search.emarefa.net/detail/BIM-1126852
Modern Language Association (MLA)
Lin, Bau-Show…[et al.]. Canopy Resistance and Estimation of Evapotranspiration above a Humid Cypress Forest. Advances in Meteorology No. 2020 (2020), pp.1-16.
https://search.emarefa.net/detail/BIM-1126852
American Medical Association (AMA)
Lin, Bau-Show& Lei, Huimin& Hu, Ming-Che& Visessri, Supattra& Hsieh, Cheng-I. Canopy Resistance and Estimation of Evapotranspiration above a Humid Cypress Forest. Advances in Meteorology. 2020. Vol. 2020, no. 2020, pp.1-16.
https://search.emarefa.net/detail/BIM-1126852
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1126852