The relation between columnar and surface aerosol optical properties in a background environment

Szczepanik, Dominika; Markowicz, Krzysztof M.

doi:10.1016/j.apr.2017.10.001

Cited by 10 publications

(15 citation statements)

References 51 publications

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“…The atmospheric boundary layer is regarded as the lowest layer of the troposphere; it is directly influenced by the Earth's surface and reacts quickly to the surface forcing (Stull, 1988). The atmospheric boundary layer height (ABLH) can be derived from the lidar elastic-scattering aerosol backscatter signal, which relies on a higher aerosol load within the boundary layer than in the free troposphere.…”

Section: Methodology Of Lidar Product Retrievalmentioning

confidence: 99%

“…Marinou et al (2017) reported that dust particles can be transported far from their source of origin and are frequently observed over central and northern Europe, with higher occurrences during summer. Dust particles can occur over Warsaw, mainly in the free troposphere (at a height above 2-3 km) during the spring and summer period (Chilinski et al, 2016;Szczepanik et al, 2019). Biomass-burning particles and smoke layers were detected over central Europe in the summers of 2013 (Janicka et al, 2017;Ortiz-Amezcua et al, 2017;Trickl et al, 2015), 2015 (Stachlewska et al, 2017b;Szkop and Pietruczuk, 2017), and 2016 (Stachlewska et al, 2018).…”

Section: Relation Of the Ablh With Optical Properties Andmentioning

confidence: 99%

“…At nighttime, an increasing LR due to the accumulation of hygroscopic smoke particles was reported by Giannkaki et al (2010). The convection and the energy exchange is stronger in the transition time (Stull, 1988), leading to anthropogenic aerosol being dominant in the atmospheric boundary layer. Increasing the surface RH results in a rise in the aerosol particles' size, and thus contributes to a decrease in the LR ABL .…”

Section: Relations Of Optical Properties Surface Pm and Relative Humentioning

confidence: 99%

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Interrelations between surface, boundary layer, and columnar aerosol properties derived in summer and early autumn over a continental urban site in Warsaw, Poland

2019

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Abstract. PollyXT Raman polarization lidar observations were performed at the Remote Sensing Laboratory (RS-Lab) in Warsaw (52.2109∘ N, 20.9826∘ E), Poland, in the framework of the European Aerosol Research Lidar Network (EARLINET) and the Aerosol, Clouds, and Trace gases Research Infrastructure (ACTRIS) projects. Data collected in July, August, and September of 2013, 2015, and 2016 were analysed using the classical Raman approach. In total, 246 sets of intact profiles, each set comprising particle extinction (α) and backscatter coefficients (β) as well as linear particle depolarization ratios (δ) at 355 nm and 532 nm, were derived for statistical investigations and stored in the EARLINET/ACTRIS database. The main analysis was focused on intensive optical properties obtained within the atmospheric boundary layer (ABL). Their interrelations were discussed for different periods: the entire day; nighttime, with respect to the nocturnal boundary layer (NL) and the residual boundary layer (RL); at sunrise, with respect to the morning transition boundary layer (MTL); and from late afternoon until sunset, with respect to the well-mixed boundary layer (WML). Within the boundary layer, the lidar-derived optical properties (entire day, 246 sets) revealed a mean aerosol optical depth (AODABL) of 0.20±0.10 at 355 nm and 0.11±0.06 at 532 nm; a mean Ångström exponent (ÅEABL) of 1.54±0.37; a mean lidar ratio (LRABL) of 48±17 sr at 355 nm and 41±15 sr at 532 nm; a mean linear particle depolarization ratio (δABL) of 0.02±0.01 at 355 nm and 0.05±0.01 at 532 nm; and a mean water vapour mixing ratio (WVABL) of 8.28±2.46 g kg−1. In addition, the lidar-derived daytime boundary layer optical properties (for the MTL and WML) were compared with the corresponding daytime columnar aerosol properties derived from the multi-filter rotating shadowband radiometer (MFR-7) measuring within the National Aerosol Research Network (PolandAOD-NET) and the CE318 sun photometer of the Aerosol Robotic NETwork (AERONET). A high linear correlation of the columnar aerosol optical depth values from the two latter instruments was obtained in Warsaw (a correlation coefficient of 0.98 with a standard deviation of 0.02). The contribution of the aerosol load in the summer and early-autumn free troposphere can result in an AODCL value that is twice as high as the AODABL over Warsaw. The occurrence of a turbulence-driven aerosol burst from the boundary layer into the free troposphere can further increase this difference. Aerosol within the ABL and in the free troposphere was interpreted based on comparisons of the properties derived at different altitudes with values reported in the literature, which were characteristic for different aerosol types, in combination with backward trajectory calculations, satellite data, and model outputs. Within the boundary layer, the aerosol consisted of either urban anthropogenic pollution (∼ 61 %) or mixtures of anthropogenic aerosol with biomass-burning aerosol (< 14 %), local pollen (< 7 %), or Arctic marine particles (< 5 %). No significant contribution of mineral dust was found in the boundary layer. The lidar-derived atmospheric boundary layer height (ABLH) and the AODABL exhibited a positive correlation (R of 0.76), associated with the local anthropogenic pollution (most pronounced for the RL and WML). A positive correlation of the AODABL and LRABL and a negative correlation of the ÅEABL and LRABL, as well as the expected negative trends for the WVABL (and surface relative humidity, RH) and δABL, were observed. Relations of the lidar-derived aerosol properties within the ABL and the surface in situ measurements of particulate matter with an aerodynamic diameter less than 10 µm (PM10) and less than 2.5 µm (PM2.5) measured by the Warsaw Regional Inspectorate for Environmental Protection (WIOS) network, and the fine-to-coarse mass ratio (FCMR) were investigated. The FCMR and surface RH showed a positive correlation even at nighttime (R of 0.71 for the MTL, 0.63 for the WML, and 0.6 for the NL), which generally lacked statistically significant relations. A weak negative correlation of the FCMR and δABL (more pronounced at 532 nm at nighttime) and no casual relation between the FCMR and ÅEABL were found. Most interestingly, distinct differences were observed for the morning transition layer (MTL) and the well-mixed layer (WML). The MTL ranged up to 0.6–1 km, and was characterized by a lower AODABL(<0.12), wetter conditions (RH 50–80 %), smaller particles (ÅEABL of 1–2.2; FCMR from 0.5 to 3), and a low LRABL of between 20 and 40 sr. The WML ranged up to 1–2.5 km and exhibited a higher AODABL (reaching up to 0.45), drier conditions (RH 25–60 %), larger particles (ÅEABL of 0.8–1.7; FCMR of 0.2–1.5), and a higher LRABL of up to 90 sr.

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Section: Methodology Of Lidar Product Retrievalmentioning

confidence: 99%

Section: Relation Of the Ablh With Optical Properties Andmentioning

confidence: 99%

Section: Relations Of Optical Properties Surface Pm and Relative Humentioning

confidence: 99%

See 1 more Smart Citation

Interrelations between surface, boundary layer, and columnar aerosol properties derived in summer and early autumn over a continental urban site in Warsaw, Poland

2019

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“…Note that for the lack of free troposphere aerosol transport the obtained 3 year mean values of summer/early-autumn AOD ABL of 0.2 at 355 nm and 0.1 at 532 nm are actually rather high values! For conditions with no aerosol layers in the free-troposphere about the site, Szczepanik & Markowicz, 2018 proposed an approximation of boundary layer aerosol load for rural mountainous site (Strzyzow, Poland) as being of AOD ABL (Strzyzow) ≈ 80%AOD CL . Clearly this approximation for Warsaw urban continental site would be rather of AOD ABL (Warsaw) ≈ 67% AOD CL .…”

Section: Resultsmentioning

confidence: 99%

Interrelations between surface, boundary layer, and columnar aerosol properties over a continental urban site

Wang

Szczepanik

Stachlewska

2018

Preprint

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Abstract. PollyXT Raman Polarization Lidar observations were performed at the Remote Sensing laboratory in Warsaw (52.2109° N, 20.9826° E), Poland, in the framework of the European Aerosol Research Lidar Network (EARLINET) and the Aerosols, Clouds and Trace gases Research Infrastructure (ACTRIS). Data collected in July, August and September of 2013, 2015 and 2016 were analysed using the classical Raman approach. In total 202 sets of profiles of the particle extinction and backscatter coefficient, and linear particle depolarization ratio at 355 nm and 532 nm were derived for statistical investigations (EARLINET/ACTRIS Data Base). The main analysis was focused on intensive optical properties obtained within aerosol boundary layer (ABL). The interrelationships of different optical properties inside ABL are discussed for different periods: entire day, nocturnal time and sunrise/sunset time. In addition, the lidar derived boundary layer optical properties were compared with the columnar daytime aerosol properties derived from radiometer (MFR-7, PolandAOD-NET) and photometer (C318, AERONET). Relationships of these and surface in-situ measurements of particulate matter with an aerodynamic diameter

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“…Relationship between AOD and surface extinction coefficient (Figure 8d) is quite strong (r = 0.77), which indicate either well-mixed air mass conditions and rather small aerosol contribution to AOD above the APBL. Previous study of the relation between AOD and surface scattering coefficient at SolarAOT site indicated that correlation between both parameters depends on weather conditions (mostly temperature gradient) and time range of data averaging [60]. For monthly mean, AOD and scattering coefficient was found negatively correlated due to scattering peak observed during winter season (smog), while AOD peak falls in spring and summer.…”

Section: Comparison Of In-situ Surface and Aeronet Photometric Columnmentioning

confidence: 92%

Comparison of Columnar, Surface, and UAS Profiles of Absorbing Aerosol Optical Depth and Single-Scattering Albedo in South-East Poland

et al. 2019

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The impact of absorbing aerosols on climate is complex, with their potential positive or negative forcing, depending on many factors, including their height distribution and reflective properties of the underlying background. Measurement data is very limited, due to insufficient remote sensing methods dedicated to the retrieval of their vertical distribution. Columnar values of absorbing aerosol optical depth (AAOD) and single scattering albedo (SSA) are retrieved by the Aerosol Robotic Network (AERONET). However, the number of available results is low due to sky condition and aerosol optical depth (AOD) limitation. Presented research describes results of field campaigns in Strzyżów (South-East Poland, Eastern Europe) dedicated to the comparison of the absorption coefficient and SSA measurements performed with on-ground in-situ devices (aethalomter, nephelometer), small unmanned aerial system (UAS) carrying micro-aethalometer, as well as with lidar/ceilometer. An important aspect is the comparison of measurement results with those delivered by AERONET. Correlation of absorption to scattering coefficients measured on ground (0.79) and correlation of extinction on ground to AOD measured by AERONET (0.77) was visibly higher than correlation between AOD and AAOD retrieved by AERONET (0.56). Columnar SSA was weakly correlated with ground SSA (higher values of columnar SSA), which were mainly explained by hygroscopic effects, increasing scattering coefficient in ambient (wet conditions), and partly high uncertainty of SSA retrieval. AAOD derived with the use of profiles from UAS up to PBL height, was estimated to contribute in average to 37% of the total AAOD. A method of AAOD estimation, in the whole troposphere, with use of measured vertical profiles of absorption coefficient and extinction coefficient profiles from lidars was proposed. AAOD measured with this method has poor correlation with AERONET data, however for some measurements, within PBL, AAOD was higher than reported by AERONET, suggesting potential underestimation in photometric measurement under particular conditions. Correlation of absorption coefficient in profile to on ground measurements decrease with altitude. Measurements of SSA from drones agree well with ground measurements and are lower than results from AERONET, which suggests a larger contribution of absorbing aerosols. As an alternative for AAOD estimation in case of lack of AERONET AAOD data simple models are proposed, which base on AOD scaling with SSA measured with different methods. Proposed solution increase potential of absorption coefficient measurements in vertical profiles and columns of the atmosphere. Presented solutions make measurements of absorption coefficients in vertical profiles more affordable and allow rough estimation of columnar values for the whole atmosphere.

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The relation between columnar and surface aerosol optical properties in a background environment

Cited by 10 publications

References 51 publications

Interrelations between surface, boundary layer, and columnar aerosol properties derived in summer and early autumn over a continental urban site in Warsaw, Poland

Interrelations between surface, boundary layer, and columnar aerosol properties derived in summer and early autumn over a continental urban site in Warsaw, Poland

Interrelations between surface, boundary layer, and columnar aerosol properties over a continental urban site

Comparison of Columnar, Surface, and UAS Profiles of Absorbing Aerosol Optical Depth and Single-Scattering Albedo in South-East Poland

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