Hauptseite > Publikationsdatenbank > Quantification and prediction of nighttime evapotranspiration for two distinct grassland ecosystems > print

001     861592
005     20210131030916.0
024 7 _ |a 10.1029/2018WR024072
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100 1 _ |a Groh, J.
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245 _ _ |a Quantification and prediction of nighttime evapotranspiration for two distinct grassland ecosystems
260 _ _ |a [New York]
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520 _ _ |a Evapotranspiration (ET) is, after precipitation, the second largest flux at the land surface in the water cycle and occurs mainly during daytime. Less attention has been given to water fluxes from the land surface into the atmosphere during nighttime (i.e., between sunset and sunrise). The nighttime ET (ETN) may be estimated based on models that use meteorological data; however, due to missing experimental long‐term data, the verification of ETN estimates is limited. In this paper, the amount of ETN for two grassland ecosystems was determined from highly temporally resolved and precise weighing lysimeter data. We found that annual ETN ranged between 3.5% and 9.5% of daytime annual ET (ETD) and occurred mainly during wet soil and canopy surface conditions, which suggests that ETN is largely related to evaporation. ETN was positively correlated with wind speed. Dew formation, ranging from 4.8% to 6.4% of annual precipitation, was in absolute terms larger than ETN. The prediction of ETN with the Penman‐Monteith model improved if the aerodynamic and surface resistance parameters were based on vegetation height observations and the nighttime stomatal resistance parameter was assumed to be zero. The occurrence of hot days during the observation period showed to increase average ETN rates. Our results suggest that ETN can be observed with precision weighing lysimeters, was a not negligible component in the water balance of the grassland ecosystems, and thus needs more attention when simulating land surface hydrological processes.
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700 1 _ |a Pütz, Thomas
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700 1 _ |a Gerke, H. H.
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700 1 _ |a Vanderborght, J.
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700 1 _ |a Vereecken, H.
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773 _ _ |a 10.1029/2018WR024072
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856 4 _ |y Published on 2019-03-21. Available in OpenAccess from 2019-09-21.
|u https://juser.fz-juelich.de/record/861592/files/Groh_et_al-2019-Water_Resources_Research-1.pdf
856 4 _ |y Published on 2019-03-21. Available in OpenAccess from 2019-09-21.
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