Influence of External Meteorology on Nocturnal Valley Drainage Winds

Barr, S.; Orgill, M.M.

doi:10.1175/1520-0450(1989)028<0497:ioemon>2.0.co;2

Cited by 85 publications

(68 citation statements)

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“…The vertical cross-section normal to the axis of the valley is approximately 6 km 2 . The ratio of the valley width at its crest to the valley depth is about 3-4, indicating a low susceptibility to ambient in uences and thus deeper drainage ows (Barr and Orgill 1989). The persistent down-valley ow of 5 m s ¡1 , eventually lling the valley up to the crest, resulted in approximately 100 km 3 h ¡1 of air owing out from the Toce river valley towards the Lago Maggiore, and this for more than 24 h (Fig.…”

Section: Observations In Map Iopmentioning

confidence: 97%

“…Banta and Cotton (1981), Whiteman (1982), Vergeiner and Dreiseitl (1987), Whiteman (1990), Li and Atkinson (1999) and Stewart et al (2002) provided an historical perspective on valley ow research and summarized present understanding of the driving mechanisms. Steinacker (1984) and McKee and O'Neal (1989) elaborated on the role of valley geometry, while Barr and Orgill (1989), Orgill et al (1992) and Whiteman and Doran (1993) detailed the relationship between overlying synoptic ow and winds within a valley. Post and Neff (1986) and Neff (1990) provided insights from a remotesensing perspective.…”

Section: Introductionmentioning

confidence: 99%

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Airflow within major Alpine river valleys under heavy rainfall

Steiner

Bousquet

Houze

et al. 2003

Quart J Royal Meteoro Soc

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SUMMARYThis study documents the air ow within major Alpine river valleys in the presence of precipitation. The analysis seeks a conceptual understanding of the effect of rain on the valley ow. Ground-based and airborne Doppler radar and surface data from the Mesoscale Alpine Programme show that during persistent rainy periods the subsidence caused by melting and evaporation of precipitation particles contributes to the formation of a down-valley ow. This down-valley ow opposes moist southerly ow aloft, which is lifted over the topographic barrier and in which precipitation particles are formed.

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Section: Observations In Map Iopmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Airflow within major Alpine river valleys under heavy rainfall

Steiner

Bousquet

Houze

et al. 2003

Quart J Royal Meteoro Soc

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“…Their turbulent measurements are consistent with Ri 50. 25 and a maximum in Ri at the katabatic flow jet. Mahrt (1979) corroborates high values of Ri at the jet due to a minimum in 6d6z in that region.…”

Section: On Slopesmentioning

confidence: 97%

“…An in-depth study by Barr and Orgill ( 1989) Davidson (1963b) observed rapid variability in katabatic flow along a lee slope during varying ambient flow conditions, presumably with some mountain wave effects. Considerably greater katabatic flow variability has also been found in numerical simulations of slope flow when an overlying ambient wind is included.…”

Section: Ambient Wind Perpendicular To Katabatic Flow Directionmentioning

confidence: 99%

The interaction of katabatic winds and mountain waves

Poulos

1997

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“…Barr and Orgill, 1989;Lareau et al, 2013) or isolated bowls and sinkholes (e.g. Whiteman et al, 2008;Zängl, 2005).…”

Section: Introductionmentioning

confidence: 99%

Assessment of valley cold pools and clouds in a very high-resolution numerical weather prediction model

et al. 2015

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Abstract. The formation of cold air pools in valleys under stable conditions represents an important challenge for numerical weather prediction (NWP). The challenge is increased when the valleys that dominate cold pool formation are on scales unresolved by NWP models, which can lead to substantial local errors in temperature forecasts. In this study a 2-month simulation is presented using a nested model configuration with a finest horizontal grid spacing of 100 m. The simulation is compared with observations from the recent COLd air Pooling Experiment (COLPEX) project and the model's ability to represent cold pool formation, and the surface energy balance is assessed. The results reveal a bias in the model long-wave radiation that results from the assumptions made about the sub-grid variability in humidity in the cloud parametrization scheme. The cloud scheme assumes relative humidity thresholds below 100 % to diagnose partial cloudiness, an approach common to schemes used in many other models. The biases in radiation, and resulting biases in screen temperature and cold pool properties are shown to be sensitive to the choice of critical relative humidity, suggesting that this is a key area that should be improved for very high-resolution modeling.

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Influence of External Meteorology on Nocturnal Valley Drainage Winds

Cited by 85 publications

References 0 publications

Airflow within major Alpine river valleys under heavy rainfall

Airflow within major Alpine river valleys under heavy rainfall

The interaction of katabatic winds and mountain waves

Assessment of valley cold pools and clouds in a very high-resolution numerical weather prediction model

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