Performance of Bowen ratio systems on a slope

Nie, D.; Flitcroft, Ian D.; Kanemasu, E. T.

doi:10.1016/0168-1923(92)90091-h

Cited by 19 publications

(12 citation statements)

References 19 publications

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“…The approximate fetch of each BREB system (Figure c) was calculated following Nie et al . [], based on the height of the instruments, vegetation height, and the prevailing wind direction for each location.…”

Section: Methodsmentioning

confidence: 99%

On the observed ecohydrologic dynamics of a semiarid basin with aspect-delimited ecosystems

et al. 2013

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[1] In semiarid complex terrain, the combination of elevation and aspect promotes variations in the water and energy balance, resulting in slopes with distinct ecologic and hydrologic properties. Quantifying the differential energy and water dynamics of opposing slopes can provide essential information on the potential effects of climate variability on landscapes. In this study, we use observations from a network of hydrologic sensors deployed on the slopes of a semiarid catchment in central New Mexico, USA, to quantify the ecohydrologic dynamics of two coexisting and contrasting ecosystems : a juniper (Juniperus monosperma) savanna on a north facing slope (NFS) and a creosote (Larrea tridentata) shrubland on a south facing slope (SFS). Our analyses show that: (1) energy loads exert a first-order control on the dynamics of evapotranspiration and soil moisture residence times in the catchment, with vegetation imposing a second-order control at the onset of the growing season; (2) soils exhibit a characteristic progression of moisture and temperature along the slope-aspect continuum that is preserved throughout the year, going from a wetter and cooler NFS to a drier and warmer SFS; (3) there are remarkable differences in the runoff dynamics among the catchment slopes, with a smaller precipitation threshold triggering larger SFS runoff amounts than at its NFS counterpart; and (4) seasonal water balances of the NFS and SFS follow opposite trajectories in the year and point to distinct soil water pools for evapotranspiration demands. The results of this study have important implications for understanding landscape changes in areas of complex topography under current and future climate variability.

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Section: Methodsmentioning

confidence: 99%

On the observed ecohydrologic dynamics of a semiarid basin with aspect-delimited ecosystems

et al. 2013

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“…For example, the Bowen Ratio Energy Balance (BREB) method has been used extensively because of its robustness, since it allows automatic recordings of fluxes and is not as stringent as other methods (Angus and Watts, 1984). Therefore, BREB is easier to implement in long-term campaigns, in remote areas and on slopes (Nie et al, 1992). However, when water vapour gradients are minimal, hydrometers usually lie within the measurement error and the BREB method is not appropriate (Pérez et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

The contribution of condensation to the water cycle under high‐mountain conditions

Jong

2005

Hydrological Processes

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Abstract:Little is known about the interaction between condensation, precipitation and evaporation as an integral part of the water cycle under high-mountain conditions. This paper focuses on methods of identification and measurement of condensation under natural conditions in high alpine valleys by example of the Dischma in eastern Switzerland. The role of different vegetation zones in transferring water from and to the atmosphere is investigated above the treeline (1900-2600 m a.s.l.). Field measurements of condensation and evaporation at 10 min intervals show that condensation plays a more significant role in the water cycle than previously assumed. Both diurnal and nocturnal condensation are compared at different altitudes on slope and valley locations during the exceptionally hot and dry mid-summer of 1998. It is suggested that, in addition to standard hydrological components, water balance modelling in mountain zones should include more precise data on measured condensation.

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“…This question has been addressed in several studies. Nie et al (1992) looked into the performance of Bowen ratio systems on a slope while Geissbühler and Siegwolf (2000) discussed eddy covariance systems on a slope. A model by Segal et al (1985) applied to vegetation on two opposing slopes showed differences in the vegetation's transpiration caused by the differing irradiation.…”

Section: Introductionmentioning

confidence: 99%

Net radiation balance for two forested slopes on opposite sides of a valley

2005

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Measurements of the net radiation balance of two forested sites on the opposite slopes of a valley in south-western Germany, made over 3 years, are presented in this study. Radiation sensors were mounted horizontally on two measurement towers above two beech stands. The direct part of the measured short-wave incoming radiation was adjusted according to the slope's angle to convert horizontally measured radiation data into surface-parallel radiation fluxes. During periods when contemporaneous measurements of slope-parallel and horizontal radiation fluxes were available, the calculation of surface-parallel radiation fluxes from the horizontally recorded net radiation components were compared with measured values. The net radiative fluxes parallel to the slopes were calculated for a period of 36 months and analysed. Results show that the different aspects of both sites cause significant differences of the net radiation balance. In June, when the elevation of the sun is highest, incoming solar radiation K downward arrow received on the NE-slope was 9% lower than K downward arrow received on the SW-slope. During the winter months, the differences were much greater and incoming solar radiation to the NE-slope was 50% of that to the SW-slope. Due to the differing solar irradiance, net radiation fluxes were significantly higher on the SW-slope than on the NE-slope. For long-wave radiation only small differences between both slopes could be found. Since radiative fluxes determine the energy balance and hence the microclimate and water balance of a forest stand, these differences in the net radiation balance between the slopes are important for the vegetation.

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Performance of Bowen ratio systems on a slope

Cited by 19 publications

References 19 publications

On the observed ecohydrologic dynamics of a semiarid basin with aspect-delimited ecosystems

On the observed ecohydrologic dynamics of a semiarid basin with aspect-delimited ecosystems

The contribution of condensation to the water cycle under high‐mountain conditions

Net radiation balance for two forested slopes on opposite sides of a valley

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