Atmospheric Boundary Layer Research at Cabauw

Ulden, A. P. van; Wieringa, J.

doi:10.1007/978-94-017-0944-6_3

Cited by 155 publications

(36 citation statements)

References 65 publications

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“…The Cabauw tower is 213 m high and is specifically designed for meteorological research and establishing relations between the state of the atmospheric boundary layer (ABL), land surface conditions and the general weather situation in all seasons (Van Ulden and Wieringa 1996).…”

Section: The Cabauw Tower Experimental Sitementioning

confidence: 99%

Dew Formation, Eddy-Correlation Latent Heat Fluxes, and the Surface Energy Imbalance at Cabauw During Stable Conditions

Roode

Bosveld

Kroon

2010

Boundary-Layer Meteorol

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Observations collected between 2000 and 2008 at the Cabauw meteorological measurement platform in the Netherlands were conditionally sampled to select nights with stably stratified atmospheric conditions, clear skies and weak horizontal wind speeds (<3 m s −1 ). For these conditions the eddy-correlation latent heat fluxes are found to be negligibly small, while the conditionally sampled surface energy balance exhibits a maximum residual. However, inspection of the specific humidities for these conditions reveals systematic drying trends that are a maximum at the lowest measurement level above the surface. These drying trends occur for any prevailing wind direction. Latent heat fluxes are calculated from the humidity budget equation and from a Penman-Monteith dewfall model, with the results suggesting that during clear, stable nights the observed latent heat fluxes as obtained from the eddy-correlation technique are erroneously small.

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Section: The Cabauw Tower Experimental Sitementioning

confidence: 99%

Dew Formation, Eddy-Correlation Latent Heat Fluxes, and the Surface Energy Imbalance at Cabauw During Stable Conditions

Roode

Bosveld

Kroon

2010

Boundary-Layer Meteorol

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“…Wangara: 1967, Kansas: 1968or Minnesota: 1973, described in Hess et al, 1981and Kaimal and Wyngaard, 1990, remain fundamental references). There have been a large number of intensive field experiments since then, and in addition, systematic observations now made at some observatories allow the exploration of the PBL on a long-term basis as well: for example, at Lindenberg, Germany (Beyrich and Engelbart, 2008), Cabauw, the Netherlands (Van Ulden and Wieringa, 1996;Hurley and Luhar 2009;Baas et al, 2009;Bosveld et al, 2014) and CIBA, Spain (Yagüe and Cano, 1994), as well as flux monitoring networks worldwide.…”

Section: Introductionmentioning

confidence: 99%

The BLLAST field experiment: Boundary-Layer Late Afternoon and Sunset Turbulence

Lothon¹,

Pino²,

Couvreux³

et al. 2014

Atmos. Chem. Phys.

178

226

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Abstract. Due to the major role of the sun in heating the earth's surface, the atmospheric planetary boundary layer over land is inherently marked by a diurnal cycle. The afternoon transition, the period of the day that connects the daytime dry convective boundary layer to the night-time stable boundary layer, still has a number of unanswered scientific questions. This phase of the diurnal cycle is challenging from both modelling and observational perspectives: it is transitory, most of the forcings are small or null and the turbulence regime changes from fully convective, close to homogeneous and isotropic, toward a more heterogeneous and intermittent state.These issues motivated the BLLAST (Boundary-Layer Late Afternoon and Sunset Turbulence) field campaign that was conducted from 14 June to 8 July 2011 in southern France, in an area of complex and heterogeneous terrain. A wide range of instrumented platforms including full-size aircraft, remotely piloted aircraft systems, remote-sensing instruments, radiosoundings, tethered balloons, surface flux stations and various meteorological towers were deployed over different surface types. The boundary layer, from the earth's surface to the free troposphere, was probed during the entire day, with a focus and intense observation periods that were conducted from midday until sunset. The BLLAST field campaign also provided an opportunity to test innovative measurement systems, such as new miniaturized sensors, and a new technique for frequent radiosoundings of the low troposphere.Twelve fair weather days displaying various meteorological conditions were extensively documented during the field experiment. The boundary-layer growth varied from one day to another depending on many contributions including stability, advection, subsidence, the state of the previous day's residual layer, as well as local, meso-or synoptic scale conditions.Ground-based measurements combined with tetheredballoon and airborne observations captured the turbulence decay from the surface throughout the whole boundary layer and documented the evolution of the turbulence characteristic length scales during the transition period.Closely integrated with the field experiment, numerical studies are now underway with a complete hierarchy of models to support the data interpretation and improve the model representations.

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“…An important tool for studying the boundary layer height has been measurements on tall towers and tethered balloons (e.g. Clarke, 1972;Haugen et al, 1971;Soilemes et al, 1993;Van Ulden and Wieringa, 1996;Schnitzhofer et al, 2009). While high spatial resolution can be achieved with a tall tower (although associated with high costs), it is impossible to obtain an instantaneous high resolution temperature profile from a tethered balloon system which typically carries only one sensor.…”

Section: Introductionmentioning

confidence: 99%

Fiber optic distributed temperature sensing for the determination of the nocturnal atmospheric boundary layer height

et al. 2011

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Abstract.A new method for measuring air temperature profiles in the atmospheric boundary layer at high spatial and temporal resolution is presented. The measurements are based on Raman scattering distributed temperature sensing (DTS) with a fiber optic cable attached to a tethered balloon. These data were used to estimate the height of the stable nocturnal boundary layer. The experiment was successfully deployed during a two-day campaign in September 2009, providing evidence that DTS is well suited for this atmospheric application. Observed stable temperature profiles exhibit an exponential shape confirming similarity concepts of the temperature inversion close to the surface. The atmospheric mixing height (MH) was estimated to vary between 5 m and 50 m as a result of the nocturnal boundary layer evolution. This value is in good agreement with the MH derived from concurrent Radon-222 ( 222 Rn) measurements and in previous studies.

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Atmospheric Boundary Layer Research at Cabauw

Cited by 155 publications

References 65 publications

Dew Formation, Eddy-Correlation Latent Heat Fluxes, and the Surface Energy Imbalance at Cabauw During Stable Conditions

Dew Formation, Eddy-Correlation Latent Heat Fluxes, and the Surface Energy Imbalance at Cabauw During Stable Conditions

The BLLAST field experiment: Boundary-Layer Late Afternoon and Sunset Turbulence

Fiber optic distributed temperature sensing for the determination of the nocturnal atmospheric boundary layer height

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