Regional Patterns of Mixing Depth and Stability: Sodar Network Measurements for Input to Air Quality Models

Russell, Philip B.; Uthe, Edward E.

doi:10.1175/1520-0477(1978)059<1275:rpomda>2.0.co;2

Cited by 34 publications

(15 citation statements)

References 6 publications

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“…The inland penetration of the marine layer associated with this cycle, with low clouds and stratus its most visible artifact, has been described in detail by a number of authors (e.g., Edinger, 1959;Fosberg and Schroeder, 1966) and the depth and structure of the marine temperature inversion by others including Russell and Uthe (1978) and Lester (1985). The effect of the seabreeze on surface winds measured in the Geysers has been documented by Orgill and Schreck (1985) who related observed winds to the coast-inland pressure difference and described the general relation between observed drainage winds and the ambient flow.…”

Section: The Geysers Geothermal Areamentioning

confidence: 96%

Observations of complex-terrain flows using acoustic sounders: Experiments, topography, and winds

Neff

King

1987

Boundary-Layer Meteorol

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Acoustic sounders have now been used extensively in a series of noctural drainage flow experiments carried out by the U.S. Department of Energy's Atmospheric Studies in Complex Terrain (ASCOT) program. Doppler acoustic sounders, located in three different valleys during the sequence of experiments, reveal drainage-wind profiles that depend strongly on the ambient meteorological conditions and the elevation of each observing site relative to surrounding terrain. In elevated sites that drain easily, Doppler-sounder derived wind profiles show a simply-structured flow; in lower lying areas, subject to topographic constriction and cold-air pooling, and where Archimedean forces are comparable to those due to synoptic and mesoscale pressure gradients, the wind profiles show considerable vertical and temporal variation. In particular, in the Geysers area ofnorthern California, the seabreeze and the depth ofthe Pacific Coast marine inversion affect not only the initiation of drainage winds but also their subsequent evolution.

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Section: The Geysers Geothermal Areamentioning

confidence: 96%

Observations of complex-terrain flows using acoustic sounders: Experiments, topography, and winds

Neff

King

1987

Boundary-Layer Meteorol

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“…[15] The height of the inversion is an integral variable in dispersion modeling equations [Turner, 1970;Russell and Uthe, 1978]. The top of the inversion layer has been identified as a level at which elevated concentrations of pollution gases and aerosols occur [Bridgman et al, 1989].…”

Section: Inversion Heightmentioning

confidence: 99%

“…With surface-based inversion, the situation is quite different. Since the inversion is based at ground level, many air quality models set the mixing depth equal to zero [Russell and Uthe, 1978].…”

Section: Inversion Heightmentioning

confidence: 99%

“…However, the studies and modeling of air pollutants dispersion require knowledge of certain meteorological variables such as atmospheric stability, mixing height and dispersion parameters [Abdul-Wahab et al, 1999;Abdul-Wahab and AlAlawi, 2002]. Remote sensing systems (acoustic sounding, Doppler acoustic sounders) or conventional in situ systems (instrumented tower, a tethered balloon or an instrumented aircraft) can be very useful to determine these variables [AeroVironment, Inc., 1976;Russell and Uthe, 1978;Gaffen et al, 1992aGaffen et al, , 1992b.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of thermal inversions in the Khareef Salalah region in the Sultanate of Oman

Abdul‐Wahab

2003

J. Geophys. Res.

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[1] Meteorology and topography (shape of the land) are two of the most important environmental factors that control the movement of pollutants in the atmosphere. A wellknown example of the importance of topography and meteorology is the so-called monsoon season in Salalah (Khareef Salalah) in the Sultanate of Oman. The purpose of this paper is to investigate the role of the elevated stable layer, particularly during monsoon season in Salalah. The study addresses the statistical analysis of inversion parameters. It will also improve our common understanding of the monsoon and how it is dominated by inversions. In this work, the monthly characteristics of inversions are investigated using the daily radiosonde measurements to a height of 2 km over a period of 1 year. Both surface-based and elevated inversions are investigated. Based on the analysis of data recovered from weather balloons, the study shows a strong monthly change in inversion frequency, depth, and strength. Overall, inversions are less common in summer (55.4% in May) than in winter (82.8% in January). The surface-based inversion frequency is at a minimum in summer and at a maximum in winter. The surface-based inversions reach a maximum depth in winter and are almost absent during summer. An opposite trend in elevated inversion is seen. Most summer inversions are elevated, and a maximum in their frequencies is found during May to September. The elevated inversions are generally deeper and stronger than the surface-based inversions. The correlation coefficient for the relationships between the inversion depth and temperature difference across the inversion was determined for both the surface-based and elevated inversions. It was 0.82 for the surface-based inversion, whereas it was appreciably lower (0.39) for the elevated inversion. Moreover, the correlation coefficient between the log inversion depth and the log temperature difference across the elevated inversion was high (i.e., 0.75).

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“…Techniques have been developed to derive turbulence parameters such as the sensible heat flux (Sen Gupta et al 1986), turbulence kinetic energy budget (Greenhut & Mastrantonio 1989), and temperature structure functions (Moulsley et al 1981, Singal et al 1982. Sodars are also used in determining mixed layer height (Russell & Uthe 1978, Coulter 1979, Beyrich 1995, Asimakopoulos et al 2004, Emeis et al 2008.…”

Section: Introductionmentioning

confidence: 99%

Boundary Layer Characteristics over Aindanda Low-Mountain Pass of Kathmandu Valley, Nepal

Shrestha

Maharjan

et al. 2015

J. Inst. Sci. Tech.

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The early monsoon time boundary layer characteristics prevailing over Aindanda low-mountain pass of Kathmandu valley has been continuously monitored for the period of 11 to 24 June 2013. The study reveals that the Aindanda pass channels regional air masses from the western neighboring valley up into the Kathmandu valley as westerly/ northwesterly winds during the daytime whereas it drains air mass out of the valley during nighttime. The speed of the westerly/northwesterly wind over the pass often exceeds 6.5 ms -1 during the late afternoon. Nighttime mixing layer height (MLH) was highly fluctuating with an average around 300m whereas daytime MLH was suppressed limiting it in between 290-450m above the ground in early part of the day but reduced to 210-270m during the late afternoon.Comparison of diurnal variation of mixing layer height at Aindanda with that of the central area of the valley floor strongly suggests that air mass intruding into the Kathmandu valley through this pass is a cool density flow over the weakly stratified mixed layer of valley. The structure of the wind channeled through this pass indicates the possibility of making hydraulic jump in the western part of the Kathmandu valley, particularly, during the late afternoon time.

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Regional Patterns of Mixing Depth and Stability: Sodar Network Measurements for Input to Air Quality Models

Cited by 34 publications

References 6 publications

Observations of complex-terrain flows using acoustic sounders: Experiments, topography, and winds

Observations of complex-terrain flows using acoustic sounders: Experiments, topography, and winds

Analysis of thermal inversions in the Khareef Salalah region in the Sultanate of Oman

Boundary Layer Characteristics over Aindanda Low-Mountain Pass of Kathmandu Valley, Nepal

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