Lidar measurement of the aerosol extinction profile in Black Sea coastal zone

Kolev, Ivan; Skakalova, Toni S.; Григоров, Иван

doi:10.1016/s1352-2310(00)00095-9

Cited by 12 publications

(3 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, RH should be larger just below the top of the ABL, resulting in enhancing the aerosol scattering coefficient because of the hygroscopic growth effect, normally for RH greater than 70% [ Hanel , 1976; Fitzgerald et al , 1982]. Kolev et al [2000] compared the vertical distribution of aerosol extinction coefficient in a well mixed marine boundary layer with the extinction profiles determined following the analytical model proposed by Fitzgerald [1989]. Our results supported the assumption that in a well‐developed mixing layer the change of the extinction coefficient with height is mainly due to the increase in the relative humidity.…”

Section: Resultsmentioning

confidence: 99%

Analysis of aerosol vertical distribution and variability in Hong Kong

He¹,

Li²,

Mao³

et al. 2008

J. Geophys. Res.

View full text Add to dashboard Cite

[1] Aerosol vertical distribution is an important piece of information to improve aerosol retrieval from satellite remote sensing. Aerosol extinction coefficient profile and its integral form, aerosol optical depth (AOD), as well as atmospheric boundary layer (ABL) height and haze layer height can be derived using lidar measurements. In this paper, we used micropulse lidar measurements acquired from May 2003 to June 2004 to illustrate seasonal variations of AOD and ABL height in Hong Kong. On average, about 64% of monthly mean aerosol optical depths were contributed by aerosols within the mixing layer (with a maximum ($76%) in November and a minimum ($55%) in September) revealing the existence of large abundance of aerosols above ABL due to regional transport. The characteristics of seasonal averaged aerosol profiles over Hong Kong in the study period are presented to illustrate seasonal phenomena of aerosol transport and associated meteorological conditions. The correlation between AOD and surface extinction coefficient, as found, is generally poor (r 2 $0.42) since elevated aerosol layers increase columnar aerosol abundance but not extinction at surface. The typical aerosol extinction profile in the ABL can be characterized by a low value near the surface and values increased with altitude reaching the top of ABL. When aerosol vertical profile is assumed, surface extinction coefficient can be derived from AOD using two algorithms, which are discussed in detail in this paper. Preliminary analysis showed that better estimates of the extinction coefficient at the ground level could be obtained using two-layer aerosol extinction profiles (r 2 $0.78, slope $0.82, and intercept $0.15) than uniform profiles of extinction with height within the ABL (r 2 $0.65, slope $0.27, and intercept $0.03). The improvement in correlation is promising on mapping satellite retrieved AOD to surface aerosol extinction coefficient for urban and regional environmental studies on air quality related issues.Citation: He, Q

show abstract

Section: Resultsmentioning

confidence: 99%

Analysis of aerosol vertical distribution and variability in Hong Kong

He¹,

Li²,

Mao³

et al. 2008

J. Geophys. Res.

View full text Add to dashboard Cite

show abstract

“…The initial academic motivation is then progressively replaced by economic and public health interests since breeze circulations are known to contribute to matter and energy transport, and to affect pollution ventilation, species concentration and inland pollutant transport [e.g., Lyons and Olsson, 1973]. As an example, Kolev et al [1998Kolev et al [ , 2000, Murayama et al [1999], and Vijayakumar et al [1998] assess the influence of the sea breeze on the properties of aerosols in coastal regions while Klemm et al [1998] show that in the Athens region, sea breeze air masses entering the city can carry some aged pollution having undergone at least several hours of photochemical processing in the atmosphere. Schultz and Warner [1982] find that the ventilation of pollution across the domain of the Los Angeles Basin in the absence of a synoptic-scale wind is strongly influenced by the location of the sea breeze front and the particular stage of the sea breeze life cycle.…”

Section: Introductionmentioning

confidence: 99%

Regional transport and dilution during high‐pollution episodes in southern France: Summary of findings from the Field Experiment to Constraint Models of Atmospheric Pollution and Emissions Transport (ESCOMPTE)

et al. 2007

View full text Add to dashboard Cite

In the French Mediterranean basin the large city of Marseille and its industrialized suburbs (oil plants in the Fos-Berre area) are major pollutant sources that cause frequent and hazardous pollution episodes, especially in summer when intense solar heating enhances the photochemical activity and when the sea breeze circulation redistributes pollutants farther north in the countryside. This paper summarizes the findings of 5 years of research on the sea breeze in southern France and related mesoscale transport and dilution of pollutants within the Field Experiment to Constraint Models of Atmospheric Pollution and Emissions Transport (ESCOMPTE) program held in June and July 2001. This paper provides an overview of the experimental and numerical challenges identified before the ESCOMPTE field experiment and summarizes the key findings made in observation, simulation, and theory. We specifically address the role of large-scale atmospheric circulation to local ozone vertical distribution and the mesoscale processes driving horizontal advection of pollutants and vertical transport and mixing via entrainment at the top of the sea breeze or at the front and venting along the sloped terrain. The crucial importance of the interactions between processes of various spatial and temporal scales is thus highlighted. The advances in numerical modeling and forecasting of sea breeze events and ozone pollution episodes in southern France are also underlined. Finally, we conclude and point out some open research questions needing further investigation

show abstract

“…Except two eastern trajectories (4 September 2010) probably affected by summer monsoon, the rest trajectories mainly originated from northwest or north of China, and passed over the yellow sea/east sea of China. Previous study denotes that more aerosol water uptake or hydroscopic growth would happen when near surface shallow transport with anthropogenic aerosols over the ocean (Seinfeld, 1986;Kolev et al, 2000). Since most trajectories for near surface layer were within 1 km when traversed over sea, the long-range transport pollution may be one of the sources of aerosols besides local ones.…”

Section: Back Trajectory Analysismentioning

confidence: 95%