Pic 2005, a field campaign to investigate low-tropospheric ozone variability in the Pyrenees

Gheusi, F.; Ravetta, François; Delbarre, Hervé; Tsamalis, Christoforos; Chevalier-Rosso, A.; Leroy, C.; Augustin, Patrick; Delmas, R.; Ancellet, Gérard; Athier, G.; Bouchou, P.; Campistron, Bernard; Cousin, Jean-Marc; Fourmentin, Marc; Meyerfeld, Yves

doi:10.1016/j.atmosres.2011.04.014

Cited by 32 publications

(38 citation statements)

References 51 publications

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“…While these research programmes addressed a broad range of scientific questions, a number of other campaigns targeted specific phenomena, generally in mountain areas with relatively limited geographical extent (ASCOT [26], BLLAST [27], COLPEX [28], COPS [29], CUPIDO [30], DOMEX [31], MATERHORN [32], METCRAX [33], METCRAX II [34], PAP [35], PCAPS [36], Pic 2005 [37], TRACT [38], T-REX [39], VERTIKATOR [40], VOTALP [41], and VTMX [42]). Although they did not focus primarily on exchange in the ABL over mountains, all of these experimental efforts indirectly led to significant progress in the understanding of the relevant processes.…”

Section: Introductionmentioning

confidence: 99%

Exchange Processes in the Atmospheric Boundary Layer Over Mountainous Terrain

et al. 2018

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Abstract:The exchange of heat, momentum, and mass in the atmosphere over mountainous terrain is controlled by synoptic-scale dynamics, thermally driven mesoscale circulations, and turbulence. This article reviews the key challenges relevant to the understanding of exchange processes in the mountain boundary layer and outlines possible research priorities for the future. The review describes the limitations of the experimental study of turbulent exchange over complex terrain, the impact of slope and valley breezes on the structure of the convective boundary layer, and the role of intermittent mixing and wave-turbulence interaction in the stable boundary layer. The interplay between exchange processes at different spatial scales is discussed in depth, emphasizing the role of elevated and ground-based stable layers in controlling multi-scale interactions in the atmosphere over and near mountains. Implications of the current understanding of exchange processes over mountains towards the improvement of numerical weather prediction and climate models are discussed, considering in particular the representation of surface boundary conditions, the parameterization of sub-grid-scale exchange, and the development of stochastic perturbation schemes.

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Section: Introductionmentioning

confidence: 99%

Exchange Processes in the Atmospheric Boundary Layer Over Mountainous Terrain

et al. 2018

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“…At CMP, specific humidity (SH) was higher during the central part of the day than at night (?4.0 g/kg), indicating that ABL air masses, richer in moisture, affected the measurement site (ZELLWEGER et al 2000;HENNE et al 2005). The importance of mountain slope winds (for a detailed definition, see GHEUSI et al, 2011) is consistent with the diurnal pattern of WD at CMP. In fact, although a northerly wind mainly affected the measurement site at night (probably associated with downslope mountain winds from Corno Grande; Fig.…”

Section: O 3 Diurnal Variationsmentioning

confidence: 52%

“…3, and Table 1 Further analyses are needed to clarify this point (which is not within the scope of this paper). Nonetheless, we suggest that for PUY the difference can be explained by the rather low altitude of the measurement site (possibly more affected by air-masses from the atmospheric boundary layer, ABL) whereas for PMD it could be related to the frequent exposure to oceanic air masses, as suggested by GHEUSI et al (2011).…”

Section: Tropospheric O 3 Behaviourmentioning

confidence: 89%

“…1), during the day the site was affected by southerly and westerly WD, indicating the occurrence of upslope winds from Mt Portella's south and west-facing slopes. Furthermore, wind speed was minimal during the daytime, as expected for a mountain peak site (GHEUSI et al, 2011). Analysis of average hourly O 3 values revealed a small ''reverse'' O 3 diurnal cycle (average amplitude 5.0 ppb).…”

Section: O 3 Diurnal Variationsmentioning

confidence: 89%

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Analysis of Summer Ozone Observations at a High Mountain Site in Central Italy (Campo Imperatore, 2388 m a.s.l.)

Cristofanelli

Carlo

D‧Altorio

et al. 2013

Pure Appl. Geophys.

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Abstract-Tropospheric ozone (O 3 ) is an important atmospheric pollutant and climate forcer. The Mediterranean basin is a hot-spot region in terms of short-term O 3 distribution, with frequent episodes of high tropospheric O 3 , especially during summer. To improve the characterisation of summer O 3 variability in the Mediterranean area, during the period 6-27 August 2009 an experimental campaign was conducted at Campo Imperatore, Mt Portella (CMP), a high mountain site (2,388 m a.s.l.) located in the central Italian Apennines. As deduced from analysis of atmospheric circulation, the measurement site was significantly affected by air masses originating over the Mediterranean basin, which affected the measurement site for 32 % of the time. Analysis of average values and diurnal and day-to-day variability revealed that CMP O 3 observations (average value 60.0 ± 5.1 ppbv) were comparable with measurements at other European mountain stations, indicating a prevalent effect of meteorological conditions and atmospheric transport on the synoptic scale. In fact, only a small ''reverse'' diurnal variation typically characterises diurnal O 3 variability because of local thermal wind circulation, which sporadically favours transport of air masses rich in O 3 from the foothill regions. Statistical analysis of five-day back-trajectory ensembles indicates that synoptic-scale air-mass transport from the Mediterranean Sea usually results in decreasing O 3 concentrations at CMP, whereas the highest hourly O 3 values are mostly associated with air masses from central continental Europe, eastern Europe, and northern Italy. High O 3 concentrations are also related to downward air-mass transport from higher altitudes. Comparison of in-situ O 3 variability with tropospheric O 3 satellite-based measurements reveals similar features of the two data sets. Together with the results from back-trajectory analysis, this indicates that CMP measurements might usefully improve characterisation of broad-scale O 3 variability over the central Mediterranean basin.

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“…The sensitivity of ozone formation and transport to both mesoscale flow patterns and local thermally induced flows such as those arising from water bodies and mountains has been examined for decades (e.g. Lyons and Olsson, ; Doran et al ., ; Croes and Fujita, ; Fischer et al , ; Seaman and Michelson, ; Banta et al , ; Gheusi et al ., ; Stauffer et al ., ; Tsamalis et al , ; Cleary et al , ; Wentworth et al , ), but not previously in the GSL basin. We present here a brief introduction illustrating how the Wasatch Front is a natural laboratory to understand the diverse factors affecting ozone production, transport, and destruction in metropolitan areas embedded within complex terrain.…”

Section: Introductionmentioning

confidence: 99%

Summer ozone concentrations in the vicinity of the Great Salt Lake

Horel

Crosman

Jacques

et al. 2016

Atmospheric Science Letters

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Residents near the Great Salt Lake in northern Utah, USA have been exposed to ozone levels during recent summers exceeding the current United States National Ambient Air Quality Standard. Accurately forecasting those exceedances has been difficult as a result of the complex meteorological and photochemical processes fostering them. To help improve such forecasts, a low-cost field study was conducted during summer 2015 to provide comprehensive observations of boundary-layer ozone concentrations in the context of the prevailing meteorological conditions. A network of surface ozone sensors was supplemented by sensors mounted on vehicles, a public transit light-rail car, news helicopter, tethered sonde, and unmanned aerial vehicle. The temporal and spatial evolution of boundary-layer ozone concentrations were compared with the prevailing regional and local meteorological conditions on the basis of gridded operational analyses, surface weather stations, and additional sensors deployed for the field study. High ozone concentrations during June 2015 resulted primarily from local processes while smoke transported from distant wildfires contributed to elevated ozone concentrations during August. The Great Salt Lake influenced ozone concentrations along the Wasatch Front through several mechanisms, most importantly its impact on local wind circulations. The highest ozone concentrations were often found in a narrow zone between the Great Salt Lake and the urban regions to its south and east. Observations from multiple fixed site and mobile platforms during 18-19 August illustrate the complex variations in ozone concentrations as a function of elevation at the surface as well as vertically through the deep boundary layer.

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Pic 2005, a field campaign to investigate low-tropospheric ozone variability in the Pyrenees

Cited by 32 publications

References 51 publications

Exchange Processes in the Atmospheric Boundary Layer Over Mountainous Terrain

Exchange Processes in the Atmospheric Boundary Layer Over Mountainous Terrain

Analysis of Summer Ozone Observations at a High Mountain Site in Central Italy (Campo Imperatore, 2388 m a.s.l.)

Summer ozone concentrations in the vicinity of the Great Salt Lake

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