A lagrangian approach to analyse the tropospheric ozone climatology in the tropics: Climatology of stratosphere–troposphere exchange at Reunion Island

Clain, Gaëlle; Baray, Jean-Luc; Delmas, R.; Keckhut, Philippe; Cammas, Jean‐Pierre

doi:10.1016/j.atmosenv.2009.08.048

Cited by 32 publications

(33 citation statements)

References 36 publications

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“…This operation is performed with a time step defined by the user: 10 min in this work, over a six-day period. The sensitivity and comparative study carried out by Clain et al (2010) with LACYTRAJ and other models such as FLEXPART highlights the capability of LACYTRAJ for back trajectory analysis. Details on this code can be found in Clain et al (2010).…”

Section: Back Trajectory Model: Lacytrajmentioning

confidence: 99%

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Aerosol processing and CCN formation of an intense Saharan dust plume during the EUCAARI 2008 campaign

et al. 2015

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Abstract. Atmospheric processing and CCN formation of Saharan dust is illustrated through the analysis of a case of dust transport over northern Europe. This spread of dust is investigated by combining satellite, airborne and ground-based observations and the non-hydrostatic mesoscale model Meso-NH. The altitude of the dust plume during its transport to northwestern Europe was assessed using the CALIPSO observations and our model results. The major dust plume was transported toward Mediterranean and European regions between 2 and 5 km above sea level (a.s.l.). This is confirmed by an average particle depolarization ratio equal to 30 %. Due to transport, this layer split into two layers over northern Europe, and we analyzed in this paper possible mixing of the European pollution aerosol with dust particles in the lower layer. The simulations have shown that the lower dust layer has interacted with the anthropogenic aerosol mainly over Belgium and the Netherlands. The analyses of numerical simulation results show that mineral dust particles accumulated soluble material through internal mixing over the Netherlands. The value of the CCN 0.2 / CN ratio obtained over the Netherlands (∼ 70 %) is much greater than those observed over the Saharan region. In addition over the Netherlands, the CCN measurement reached 14 000 particles cm −3 at 0.63 % supersaturation level on 30 May. Our model results reveal that more than 70 % of the CCN concentration observed on 30 May can be explained by the presence of Saharan aged dust. The study reveals that heterogeneous reactions with inorganic salts converted this Saharan mineral dust into compounds that were sufficiently soluble to impact hygroscopic growth and cloud droplet activation over the Netherlands.

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Section: Back Trajectory Model: Lacytrajmentioning

confidence: 99%

“…LACYTRAJ is a kinematic back trajectory code using the ECMWF wind field developed at the Laboratoire de l'Atmosphere et des Cyclones (LACy, France) (Baray et al, 2012;Clain et al, 2010;Duflot et al, 2010). This code was used to determine the sources of the air masses arriving above Cabauw.…”

Section: Back Trajectory Model: Lacytrajmentioning

confidence: 99%

Aerosol processing and CCN formation of an intense Saharan dust plume during the EUCAARI 2008 campaign

et al. 2015

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“…Groups of back-trajectories have been computed using LACYTRAJ, a three-dimensional kinematic trajectory code using dynamical fields produced by the ECMWF (Clain et al, 2010). In this work we use ERA-Interim reanalyses with a horizontal resolution of 0.75° in latitude and longitude, and 37 vertical levels.…”

Section: Back Trajectory Analysismentioning

confidence: 99%

Experimental Evidence of the Feeding of the Free Troposphere with Aerosol Particles from the Mixing Layer

Freney¹,

Sellegri²,

Asmi³

et al. 2016

Aerosol Air Qual. Res.

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Aerosol particles emitted by both natural and anthropogenic sources have direct and indirect radiative impacts. Within the planetary mixing layer (ML), these particles are subjected to a large number of removal processes, e.g., rain, sedimentation, coagulation, and thus have a relatively short lifetime. Once aerosols are transported into the free troposphere (FT), their atmospheric lifetime increases significantly and they tend to be representative of large spatial areas. The work presented here shows evidence of anthropogenic emissions being transported from the ML to the FT during a cold period in February 2012. Using a wide range of in-situ measurements of aerosol chemical and physical properties at the Puy de Dome (PUY) station, as well as LIDAR measurements (at the Cezeaux site) of atmospheric back scattering we studied the exchange between the ML and the FT. Criteria used to identify when the PUY station was sampling in the ML or in the FT included mixing layer height estimates from LIDAR measurements, trace gas measurements, and air mass trajectories. Within the FT, we observed a gradual change in aerosol physical properties with increases in aerosol mass concentrations of up to 2 times the starting concentration, as well as increases in the number of larger particles (particle diameter >150 nm). Aerosol chemical properties showed increases in organic and nitrate particles. A series of linear fits were made through the data providing information on how different parameters change as a function of time. The impact of these changing aerosol properties are discussed in relation to the potential influence on aerosol direct and indirect effects. This work presents a unique combination of observations, and provide valuable data for future model validation.

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“…In order to determine the dynamical origin of the precipitating clouds, we calculated back-trajectories with the LACYTRAJ model [37]. LACYTRAJ is a 3D kinematic trajectory code using ECMWF ERA-Interim re-analyses.…”

Section: Meteorological Data and Backward Trajectory Plotsmentioning

confidence: 99%

Atmospheric Processing and Variability of Biological Ice Nucleating Particles in Precipitation at Opme, France

et al. 2017

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Atmospheric ice nucleating particles (INPs) contribute to initiate precipitation. In particular, biological INPs act at warmer temperatures than other types of particles (>−10 • C) therefore potentially defining precipitation distribution. Here, in order to identify potential environmental drivers in the distribution and fate of biological INPs in the atmosphere, we conducted a mid-term study of the freezing characteristics of precipitation. A total of 121 samples were collected during a period of >1.5 years at the rural site of Opme (680 m a.s.l. (above sea level), France). INP concentration ranged over two orders of magnitude at a given temperature depending on the sample; there were <1 INPs mL −1 at ≥−5 • C,~0.1 to 10 mL −1 between −5 • C and −8 • C, and~1 to 100 mL −1 at colder temperatures. The data support the existence of an intimate natural link between biological INPs and hydrological cycles. In addition, acidification was strongly correlated with a decrease of the freezing characteristics of the samples, suggesting that human activities impact the role of INPs as triggers of precipitation. Water isotope ratio measurements and statistical comparison with aerosol and cloud water data confirmed some extent of INP partitioning in the atmosphere, with the INPs active at the warmest temperatures tending to be more efficiently precipitated.

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A lagrangian approach to analyse the tropospheric ozone climatology in the tropics: Climatology of stratosphere–troposphere exchange at Reunion Island

Cited by 32 publications

References 36 publications

Aerosol processing and CCN formation of an intense Saharan dust plume during the EUCAARI 2008 campaign

Aerosol processing and CCN formation of an intense Saharan dust plume during the EUCAARI 2008 campaign

Experimental Evidence of the Feeding of the Free Troposphere with Aerosol Particles from the Mixing Layer

Atmospheric Processing and Variability of Biological Ice Nucleating Particles in Precipitation at Opme, France

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