Columnar aerosol optical properties during “El Arenosillo 2004 summer campaign”

Prats, Natalia; Cachorro, Victoria E.; Sorribas, M.; Mogo, S.; Berjón, Alberto; Toledano, Carlos; Baraja, Angel Máximo de Frutos; Rosa, J. de la; Laulainen, N. S.; Morena, B. A. de la

doi:10.1016/j.atmosenv.2007.07.041

Cited by 32 publications

(33 citation statements)

References 18 publications

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“…Only in desert dust cases the VPSD was transformed to a practically monomodal function with a high coarse mode concentration and the modal radius shifted to lower values (Prats et al, 2008). Such behaviour was already reported in other works as those of Eck et al (2001) It is also interesting to emphasize the existence and superposition of two or even three modes over the coarse mode size distributions in some cases, e.g.…”

Section: Volume Particle Size Distributionmentioning

confidence: 71%

“…To see detailed and specific examples of the VPSD behaviour under different situations related with low and high turbidity conditions we refer the reader to a previous work (Prats et al, 2008). In Fig.…”

Section: Volume Particle Size Distributionmentioning

confidence: 99%

“…Only two photometers have not reached level 2.0. Data from instrument #114 (July 2000 until June 2001) are in level 1.5 because of miscalibration problems (Cachorro et al, 2008). A thunderstorm affected the sun-photometer #77 destroying the electronics, therefore it was not possible to perform the calibration post-deployment (January 2006until April 2006.…”

Section: Instrument and Databasementioning

confidence: 99%

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Column-integrated aerosol microphysical properties from AERONET Sun photometer over southwestern Spain

Prats

Cachorro

Berjón³

et al. 2011

Atmos. Chem. Phys.

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The aim of the present work is to carry out a detailed analysis of columnar microphysical properties obtained from Cimel sun-photometer measurements in the Southwest of Spain within the frame of the Aerosol Robotic Network (AERONET) – Iberian Network for aerosol measurements (RIMA). AERONET level 2 inversion products are analysed, in particular the particle size distribution together with their associated microphysical parameters for both fine and coarse modes: volume concentration, effective radius and the fine mode volume fraction. This work complements previous works based on aerosol optical depth (AOD) and the Ångström exponent (AE) for a global characterization of atmospheric aerosol in this area of southwestern Spain. The analysed dataset spans between February 2000 and October 2008. Time series and statistical analysis has been carried out for these parameters in order to assess their typical values and seasonality together with their relationships with the AOD and AE. Mean values of volume particle concentration are 0.06±0.07 μm3 μm−2 for total, 0.019±0.015 μm3 μm−2 for fine and 0.04±0.06 μm3 μm−2 for coarse mode; mean effective radii are 0.40±0.19 μm for total, 0.14±0.02 μm for fine and 1.96±0.41 μm for coarse mode. The most relevant features are the clear bimodality of the volume particle size distribution, with a slight dominance of the coarse mode in the overall climatology given the prevailing atmospheric conditions at the site (coastal marine). There is a clear prevalence of the coarse mode in summer months plus September and March, in coincidence with the occurrence of desert dust intrusions and highest AOD values. During desert dust outbreaks, the particle size distribution is practically monomodal with strong prevalence of the coarse mode which also shows a shift of the modal radius toward lower values. The size particle predominance defines the characteristic of the site and it has been analysed under two different parameters: the Ångström exponent and the fine mode volume fraction Vf/Vt. We investigated the relationship between them and also their relationship with the effective radius of the size distribution

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Section: Volume Particle Size Distributionmentioning

confidence: 71%

Section: Volume Particle Size Distributionmentioning

confidence: 99%

Section: Instrument and Databasementioning

confidence: 99%

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Column-integrated aerosol microphysical properties from AERONET Sun photometer over southwestern Spain

Prats

Cachorro

Berjón³

et al. 2011

Atmos. Chem. Phys.

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“…4). In addition, the typical downward trend of the r AERONET eff for the coarse mode during dusty episodes (Noh et al, 2008;Prats et al, 2008) is also observed in both sites, being more significant in the GRA case.…”

Section: Evidence Of Dust Signaturementioning

confidence: 74%

Synergetic monitoring of Saharan dust plumes and potential impact on surface: a case study of dust transport from Canary Islands to Iberian Peninsula

et al. 2011

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Abstract. The synergetic use of meteorological information, remote sensing both ground-based active (lidar) and passive (sun-photometry) techniques together with backtrajectory analysis and in-situ measurements is devoted to the characterization of dust intrusions. A case study of air masses advected from the Saharan region to the Canary Islands and the Iberian Peninsula, located relatively close and far away from the dust sources, respectively, was considered for this purpose. The observations were performed over three Spanish geographically strategic stations within the dust-influenced area along a common dust plume pathway monitored from 11 to 19 of March 2008. A 4-day long dust event (13-16 March) over the Santa Cruz de Tenerife Observatory (SCO), and a linked short 1-day dust episode (14 March) in the Southern Iberian Peninsula over the Atmospheric Sounding Station "El Arenosillo" (ARN) and the Granada station (GRA) were detected. Meteorological conditions favoured the dust plume transport over the area under study. Backtrajectory analysis clearly revealed the Saharan region as the source of the dust intrusion. Under the Saharan air masses influence, AERONET Aerosol Optical Depth at 500 nm (AOD 500 ) ranged from 0.3 to 0.6 andÅngström Exponent at 440/675 nm wavelength pair (AE 440/675 ) was lower than 0.5, indicating a high loading and predominanceCorrespondence to: C. Córdoba-Jabonero (cordobajc@inta.es) of coarse particles during those dusty events. Lidar observations characterized their vertical layering structure, identifying different aerosol contributions depending on altitude. In particular, the 3-km height dust layer transported from the Saharan region and observed over SCO site was later on detected at ARN and GRA stations. No significant differences were found in the lidar (extinction-to-backscatter) ratio (LR) estimation for that dust plume over all stations when a suitable aerosol scenario for lidar data retrieval is selected. Lidar-retrieved LR values of 60-70 sr were obtained during the main dust episodes. These similar LR values found in all the stations suggest that dust properties were kept nearly unchanged in the course of its medium-range transport. In addition, the potential impact on surface of that Saharan dust intrusion over the Iberian Peninsula was evaluated by means of ground-level in-situ measurements for particle deposition assessment together with backtrajectory analysis. However, no connection between those dust plumes and the particle sedimentation registered at ground level is found. Differences on particle deposition processes observed in both Southern Iberian Peninsula sites are due to the particular dust transport pattern occurred over each station. Discrepancies between columnar-integrated and ground-level in-situ measurements show a clear dependence on height of the dust particle size distribution. Then, further vertical size-resolved observations are needed for evaluation of the impact on surface of the Saharan dust arrival to the Iberian Peninsula.

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“…Initially, the efforts at the site were focused on the characterisation of the aerosol optical properties by means of remote-sensing methods, using spectro-radiometer and photometric measurements, (Vergaz et al, 2005;Toledano et al, 2007a, b;Prats et al, 2008). In order to quantify the contribution of the tropospheric aerosol on columnar aerosol (Córdoba-Jabonero et al, 2011), in-situ monitoring of particle number size distribution commenced in 2004.…”

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confidence: 99%

On the sub-micron aerosol size distribution in a coastal-rural site at El Arenosillo Station (SW – Spain)

Sorribas

Morena²,

Wehner

et al. 2011

Atmos. Chem. Phys.

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Abstract. This study focuses on the analysis of the submicron aerosol characteristics at El Arenosillo Station, a rural and coastal environment in South-western Spain between 1 August 2004 and 31 July 2006 (594 days). The mean total concentration (N T ) was 8660 cm −3 and the mean concentrations in the nucleation (N NUC ), Aitken (N AIT ) and accumulation (N ACC ) particle size ranges were 2830 cm −3 , 4110 cm −3 and 1720 cm −3 , respectively. Median size distribution was characterised by a single-modal fit, with a geometric diameter, median number concentration and geometric standard deviation of 60 nm, 5390 cm −3 and 2.31, respectively. Characterisation of primary emissions, secondary particle formation, changes to meteorology and long-term transport has been necessary to understand the seasonal and annual variability of the total and modal particle concentration. Number concentrations exhibited a diurnal pattern with maximum concentrations around noon. This was governed by the concentrations of the nucleation and Aitken modes during the warm seasons and only by the nucleation mode during the cold seasons. Similar monthly mean total concentrations were observed throughout the year due to a clear inverse variation between the monthly mean N NUC and N ACC . It was related to the impact of desert dust and continental air masses on the monthly mean particle levels. These air masses were associated with high values of N ACC which suppressed the new particle formation (decreasing N NUC ). Each day wasCorrespondence to: M. Sorribas (sorribasmm@inta.es) classified according to a land breeze flow or a synoptic pattern influence. The median size distribution for desert dust and continental aerosol was dominated by the Aitken and accumulation modes, and marine air masses were dominated by the nucleation and Aitken modes. Particles moved offshore due to the land breeze and had an impact on the particle burden at noon, especially when the wind was blowing from the NW sector in the morning during summer time. This increased N NUC and N AIT by factors of 3.1 and 2.4, respectively. Nucleation events with the typical "banana" shape were characterised by a mean particle nucleation rate of 0.74 cm −3 s −1 , a mean growth rate of 1.96 nm h −1 and a mean total duration of 9.25 h (starting at 10:55 GMT and ending at 20:10 GMT). They were observed for 48 days. Other nucleation events were identified as those produced by the emissions from the industrial areas located at a distance of 35 km. They were observed for 42 days. Both nucleation events were strongly linked to the marine air mass origin.

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Columnar aerosol optical properties during “El Arenosillo 2004 summer campaign”

Cited by 32 publications

References 18 publications

Column-integrated aerosol microphysical properties from AERONET Sun photometer over southwestern Spain

Column-integrated aerosol microphysical properties from AERONET Sun photometer over southwestern Spain

Synergetic monitoring of Saharan dust plumes and potential impact on surface: a case study of dust transport from Canary Islands to Iberian Peninsula

On the sub-micron aerosol size distribution in a coastal-rural site at El Arenosillo Station (SW – Spain)

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