Helicopter-Borne Flux Measurements in the Nocturnal Boundary Layer Over Land – a Case Study

Bange, Jens; Roth, Rainer

doi:10.1023/a:1002078712313

Cited by 47 publications

(28 citation statements)

References 34 publications

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“…It has been applied to a variety of environments including many coastal regions (Shao and Hacker, 1990;Tjernström and Smedman, 1993;Rogers et al, 1995;Bange and Roth, 1999;Brooks and Rogers, 2000). Shao and Hacker (1990) studied flow across a coastline under both stable and convective conditions and concluded that the theory could be applied to a horizontally heterogeneous environment provided that local processes were more important than external forcing.…”

Section: Local Similaritymentioning

confidence: 99%

The Turbulence Structure of the Stable Atmospheric Boundary Layer Around a Coastal Headland: Aircraft Observations and Modelling Results

Brooks

Söderberg

Tjernström

2003

Boundary-Layer Meteorology

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The turbulence structure of a stable marine atmospheric boundary layer in the vicinity of a coastal headland is examined using aircraft observations and numerical simulation.Measurements are drawn from a flight by the NCAR C-130 around Cape Mendocino on the coast of Northern California on June 7 1996 during the Coastal Waves 96 field program.Local similarity scaling of the velocity variances is found to apply successfully within the continuously turbulent layer; the empirical scaling function is similar to that found by several previous studies. Excellent agreement is found between the modelled and observed scaling results. No significant change in scaling behaviour is observed for the region within the expansion fan that forms downstream of the cape, suggesting that the scaling can be applied to horizontally heterogeneous conditions; however, the precise form of the function relating scaled velocities and stability is observed to change close to the surface. This result, differences between the scaling functions found here and in other studies, and the departure of these functions from the constant value predicted by the original theory leads us to question the nature of the similarity functions observed. We hypothesize that the form of the functions is controlled by non-local contributions to the velocity variance budgets, and that differences in the non-local terms between studies explain the differences in the observed scaling functions.2

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Section: Local Similaritymentioning

confidence: 99%

The Turbulence Structure of the Stable Atmospheric Boundary Layer Around a Coastal Headland: Aircraft Observations and Modelling Results

Brooks

Söderberg

Tjernström

2003

Boundary-Layer Meteorology

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“…The data of a measurement flight with the "Helipod", a meteorological sonde towed by rope to a helicopter (e.g., Bange and Roth, 1999;Bange et al, 2002;Martin and Bange, 2014), is analysed here. The Helipod sonde is equipped with different mete- (Fig.…”

Section: Helipod Instrumentationmentioning

confidence: 99%

Comparison of the fast Lyman-Alpha and LICOR hygrometers for measuring airborne turbulent fluctuations

Lampert

Hartmann

Pätzold

et al. 2017

Preprint

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“…Examples of research aircraft for boundary-layer research are the Dornier 128 (Bange et al, 2002;Corsmeier et al, 2001) and the MetAir Dimona (Neininger et al, 2001). A slightly different type of airborne system that was used for ABL research is the helicopter probe Helipod (Bange and Roth, 1999). All of them carry at least one instrument to investigate water vapour and its fluxes in the ABL.…”

Section: Water Vapour Measurement In Airborne Systemsmentioning

confidence: 99%

An inverse-modelling approach for frequency response correction of capacitive humidity sensors in ABL research with small remotely piloted aircraft (RPA)

Wildmann¹,

Kaufmann²,

Bange³

2014

Atmos. Meas. Tech.

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Abstract. The measurement of water vapour concentration in the atmosphere is an ongoing challenge in environmental research. Satisfactory solutions exist for ground-based meteorological stations and measurements of mean values. However, carrying out advanced research of thermodynamic processes aloft as well, above the surface layer and especially in the atmospheric boundary layer (ABL), requires the resolution of small-scale turbulence. Sophisticated optical instruments are used in airborne meteorology with manned aircraft to achieve the necessary fast-response measurements of the order of 10 Hz (e.g. LiCor 7500). Since these instruments are too large and heavy for the application on small remotely piloted aircraft (RPA), a method is presented in this study that enhances small capacitive humidity sensors to be able to resolve turbulent eddies of the order of 10 m. The sensor examined here is a polymer-based sensor of the type P14-Rapid, by the Swiss company Innovative Sensor Technologies (IST) AG, with a surface area of less than 10 mm 2 and a negligible weight. A physical and dynamical model of this sensor is described and then inverted in order to restore original water vapour fluctuations from sensor measurements. Examples of flight measurements show how the method can be used to correct vertical profiles and resolve turbulence spectra up to about 3 Hz. At an airspeed of 25 m s −1 this corresponds to a spatial resolution of less than 10 m.

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Helicopter-Borne Flux Measurements in the Nocturnal Boundary Layer Over Land – a Case Study

Cited by 47 publications

References 34 publications

The Turbulence Structure of the Stable Atmospheric Boundary Layer Around a Coastal Headland: Aircraft Observations and Modelling Results

The Turbulence Structure of the Stable Atmospheric Boundary Layer Around a Coastal Headland: Aircraft Observations and Modelling Results

Comparison of the fast Lyman-Alpha and LICOR hygrometers for measuring airborne turbulent fluctuations

An inverse-modelling approach for frequency response correction of capacitive humidity sensors in ABL research with small remotely piloted aircraft (RPA)

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