The Temporal Behavior of the Atmospheric Boundary Layer in Israel

Dayan, Uri; Rodnizki, J.

doi:10.1175/1520-0450(1999)038<0830:ttbota>2.0.co;2

Cited by 57 publications

(60 citation statements)

References 7 publications

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“…2). The local meteorological conditions affecting the air pollution dispersion have been studied earlier [1][2][3][4][5]. Earlier studies, however, were based on a subjective classification of the synoptic systems and concluded with a number of meteorological prototypes that lead to ground level air *Address correspondence to this author at the Association of Towns for Environmental Protection (Sharon-Carmel) P.O.B 3041, Hadera, Israel; Tel: 972-4 6123407; Fax: 972-4-6333448; E-mail: Leenes@igudhadera.co.il pollution events.…”

Section: Introductionmentioning

confidence: 99%

The Coastal Boundary Layer and Air Pollution - A High Temporal Resolution Analysis in the East Mediterranean Coast

Uzan¹,

Alpert²

2012

TOASCJ

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Abstract:The East Mediterranean (EM) coast is characterized by warm sea temperatures and a nearly linear coastline. Both parameters influence the sea breeze front and the atmospheric conditions most relevant to air pollution dispersion. Here, the high resolution boundary-layer diurnal variation is highlighted leading to a distinct pattern of spatial-temporal air pollution dispersion, for over 25 years, from Israel's largest coal-fired power plant. Over 4,000 air pollution events were segregated by semi-objective synoptic systems and 7 years of boundary layer profiles carried out by acoustic radar. Results clarify why the highest air pollution events occur during summer at 12:00-15:00 h through the average coincident drop of the boundary layer height down to 450 m above the ground. Here, the interaction between the synoptics and the sea-breezes is shown to play a significant role in the specific air pollution pattern.

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Section: Introductionmentioning

confidence: 99%

The Coastal Boundary Layer and Air Pollution - A High Temporal Resolution Analysis in the East Mediterranean Coast

Uzan¹,

Alpert²

2012

TOASCJ

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“…The combination of mid-tropospheric subsidence and lower level cool advection enhances the marine inversion, which prevails over the Levant region in summer (at about 700-900 m a.s.l. in Israel; Dayan and Rodnizki, 1999). This inversion has far-reaching environmental implications due to its effects on air pollution (Dayan et al, 1988(Dayan et al, , 2002Koch and Dayan, 1992) and on heat stress.…”

Section: Introductionmentioning

confidence: 99%

The factors governing the summer regime of the eastern Mediterranean

Ziv

Saaroni

Alpert

2004

Intl Journal of Climatology

284

201

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The synoptic scale features over the eastern Mediterranean (EM) for July-August are examined using National Centers for Environmental Prediction-National Center for Atmospheric Research reanalysis data. The region is subjected to two primary factors: mid-upper level subsidence and lower level cool advection, associated with the Etesian winds.The interdiurnal variations of these factors were found to be correlated with each other, with a maximum of r = 0.76, found between the 700 hPa subsidence and the 925 hPa wind speed. The impact of these factors on the temperature regime was examined through their contributions in the temperature tendency equation at 32.5°N, 35°E. A significant correlation was found between them at the 850 hPa level, indicating that they tend to balance each other. This explains the low interdiurnal temperature variations there in summer.Zonal-vertical and isentropic cross-sections indicate the existence of a closed circulation connecting the EM with the Asian monsoon, and a meridional-vertical cross-section indicates a signature of the Hadley cell across eastern North Africa. Air back-trajectories demonstrate that the EM is connected at the lower troposphere with Europe, at the midtroposphere with eastern North Africa and at the higher troposphere with the Asian monsoon. Significant correlation was found between the interdiurnal variations in the upward motion over the Asian monsoon and the subsidence over the Levant, with a 1 day lag, implying that the Asian monsoon controls the interdiurnal variations over the Levant.A detailed analysis shows that the correlation between the two dynamic factors governing the EM results from a linkage existing between each one of them and the Asian monsoon. An intensification of the Asian monsoon enhances both the subsidence over the Levant, via the circulation connecting them, and the Etesian winds, due to the enhanced pressure gradient between the two regions.

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“…During the summer, the subtropical high drifts northward and eastward, covering the whole African coast. During this season, sinking air produces a strong upper level subsiding inversion (Dayan and Rodnizki, 1999;Dayan et al, 2002). In winter the subtropical high pressure cell moves south, enhancing the probability of a penetration of rain-producing mid-latitude synoptic systems as well as the development of extratropical cyclones in the Mediterranean Basin (MB).…”

Section: Mediterranean Climatic Conditions and Cyclogenesismentioning

confidence: 99%

Review Article: Atmospheric conditions inducing extreme precipitation over the eastern and western Mediterranean

Dayan

Nissen

Ulbrich

2015

Nat. Hazards Earth Syst. Sci.

100

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Abstract. This review discusses published studies of heavy rainfall events over the Mediterranean Basin, combining them in a more general picture of the dynamic and thermodynamic factors and processes that produce heavy rain storms. It distinguishes the western and eastern Mediterranean in order to point out specific regional peculiarities. The crucial moisture for developing intensive convection over these regions can be originated not only from the adjacent Mediterranean Sea but also from distant upwind sources. Transport from remote sources is usually in the mid-tropospheric layers and associated with specific features and patterns of the larger-scale circulations. The synoptic systems (tropical and extratropical) that account for most of the major extreme precipitation events and the coupling of circulation and extreme rainfall patterns are presented. Heavy rainfall over the Mediterranean Basin is caused at times in concert by several atmospheric processes working at different atmospheric scales, such as local convection, upper synoptic-scale-level troughs, and mesoscale convective systems. Under tropical air-mass intrusions, convection generated by static instability seems to play a more important role than synoptic-scale vertical motions. Locally, the occurrence of torrential rains and their intensity is dependent on factors such as temperature profiles and implied instability, atmospheric moisture, and lower-level convergence.

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The Temporal Behavior of the Atmospheric Boundary Layer in Israel

Cited by 57 publications

References 7 publications

The Coastal Boundary Layer and Air Pollution - A High Temporal Resolution Analysis in the East Mediterranean Coast

The Coastal Boundary Layer and Air Pollution - A High Temporal Resolution Analysis in the East Mediterranean Coast

The factors governing the summer regime of the eastern Mediterranean

Review Article: Atmospheric conditions inducing extreme precipitation over the eastern and western Mediterranean

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