Konstantin Baibakov's research while affiliated with Natural Sciences and Engineering Research Council of Canada and other places
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Publications (24)
Starphotometry, the night-time counterpart of sunphotometry, has not yet achieved the commonly sought observational error level of 1 %: a spectral optical depth (OD) error level of 0.01. In order to address this issue, we investigate a large variety of systematic (absolute) uncertainty sources. The bright-star catalogue of extraterrestrial referenc...
In this work we report the airborne aerosol optical depth (AOD) from measurements within freshly emitted anthropogenic plumes arising from mining and processing operations in the Athabasca Oil Sands Region (AOSR) in the context of ground-based AERONET climatological daily averaged AODs at Fort McMurray (Alberta, Canada). During two flights on 9 and...
Starphotometry, the nightime counterpart of sunphotometry, has not yet achieved the commonly sought observational error level of 1%: a spectral optical depth (OD) error level of 0.01. In order to address this issue, we investigate a large variety of systematic (absolute) uncertainty sources. The bright star catalog of extraterrestrial references is...
In this work we report the airborne aerosol optical depth (AOD) from measurements within freshly-emitted anthropogenic plumes arising from mining and processing operations in the Athabasca Oil Sands Region (AOSR) in the context of ground-based AERONET climatological daily averaged AODs at Fort McMurray (Alberta, Canada). During two flights on June...
In the last decade, there has been significant progress in in-situ characterization of cloud structures, microphysical properties, and aerosol content, as a result of new instrumentation and focused field studies. However, the difficulties with data collection in adverse conditions and limited number of aircraft campaigns as well as monitoring stat...
The high latitudes are likely to experience an increase in annual mean precipitation by the end of this century [1]. However, the difficulties in data collection and limited numbers of monitoring stations have resulted in significant knowledge gaps about these regions [2]. In the last decade, there has been an improvement in the characterization of...
Ice water content (IWC) is one of the critical parameters in determining the cloud radiative impact. In this work lidar-based IWC retrievals obtained in tropical mesoscale convective systems are evaluated in the context of an extensive in-situ and remote sensing instrumentation suite. Based on a test case of May 27, 2015 lidar-derived IWC values at...
We compared April to September retrievals of total, fine-mode (sub-micron), and coarse-mode (super-micron) aerosol optical depth (AOD) from the Aerosol Robotic Network (AERONET) with simulations from a global three-dimensional chemical transport model, the Goddard Earth Observing System (GEOS-Chem), across five Arctic stations and a four-year sampl...
We compared star-photometry-derived, polar winter aerosol optical depths
(AODs), acquired at Eureka, Nunavut, Canada, and Ny-Ålesund, Svalbard,
with GEOS-Chem (GC) simulations as well as ground-based lidar and
CALIOP (Cloud-Aerosol Lidar with Orthogonal Polarization)
retrievals over a sampling period of two polar winters. The results indicate
signi...
We compared star photometry-derived, polar winter aerosol optical depths (AODs), acquired at Eureka, Nunavut, Canada and Ny-Ålesund, Svalbard with GEOS-Chem (GC) simulations as well as ground-based lidar and CALIOP retrievals. The results indicate significant cloud and/or low-altitude ice crystal (LIC) contamination which is only partially correcte...
We present recent progress on nighttime retrievals of aerosol and cloud
optical properties over the PEARL (Polar Environmental Atmospheric Research
Laboratory) station at Eureka (Nunavut, Canada) in the High Arctic
(80° N, 86° W). In the spring of 2011 and 2012, a
star photometer was employed to acquire aerosol optical depth (AOD) data, while
verti...
We present recent progress related to the night-time retrievals of aerosol and cloud optical depth using starphotometry over the PEARL (Polar Environmental Atmospheric Research Laboratory) station at Eureka (Nunavut, Canada) in the High Arctic (80° N, 86° W). In the spring of 2011 and 2012, the SPSTAR starphotometer was employed to acquire aerosol...
We describe our seven year experience and the specific technical and environmental challenges we had to overcome while operating a telescope in the High Arctic, at the Eureka Weather Station, during the polar winter. The facility and the solutions implemented for remote control and maintenance are presented. We also summarize the observational chal...
During the summer of 2011 the BORTAS (BOReal forest fires on
Tropospheric oxidants over the Atlantic using Aircraft and Satellites)
field campaign was carried out over eastern Canada and the western
Atlantic. Both passive and active optical measurements were carried out
at Halifax, NS using ground-based sun/star photometry and backscatter
(Raman) l...
The Arctic region is characterized by complex interactions between
aerosols, clouds and precipitation. Ground-based observations of
atmospheric optical properties are usually comprised of photometric
aerosol optical depth (AOD) measurements and lidar extinction and
backscatter profiles. The night-time AODs obtained with star- and
moonphotometry hav...
During March 2008 photometer observations of Arctic aerosol were performed both at a Russian ice-floe drifting station (NP-35) at the central Arctic ocean (56.7–42.0° E, 85.5–84.2° N) and at Ny-Ålesund, Spitsbergen (78.9° N, 11.9° E). Next to a persistent increase of AOD over NP-35, two pronounced aerosol events have been recorded there, one origin...
Aerosols can significantly alter the Arctic's delicate radiative
balance, both directly by absorbing and scattering solar and terrestrial
radiation, and indirectly by influencing cloud properties through their
critical role as cloud condensation nuclei. The understanding of aerosol
dynamics, however, is especially poor in the Arctic, where our know...
Aerosols can significantly alter the Arctic's delicate radiative balance, both directly by absorbing and scattering solar and terrestrial radiation, and indirectly by influencing cloud properties through their critical role as cloud condensation nuclei. Aerosol optical depth (AOD), a multi-spectral indicator of the total vertical extinction due to...
Aerosol optical depth (AOD) is the most important (aerosol) radiative forcing parameter. During the day, it is traditionally measured using the well-known sunphotometry technique. Night-time AOD measurements on the other hand are sparse and historically the byproduct of astronomical observations where the AOD plays a secondary role of observation c...
In the summer of 2007, a SPSTAR03 starphotometer was installed at Egbert, Canada (44°13′ N, 79°45′ W, alt 264 m) and a continuous series of initial measurements was performed between August 26 and September 19. Several sunphotometry parameters such as the aerosol
optical depth (AOD) and the “fine” and “coarse” optical depths were extracted from th...
The ARCTAS (Arctic Research of the Composition of the Troposphere from
Aircraft and Satellites) campaign during the spring of 2008 provided a
unique opportunity to compare and interpret a variety of airborne,
groundbased and satellite aerosol measurments. In this communication we
focus on the Arctic-wide interpretation of sunphotometry measurements...
Numerous fine mode (sub-micron) aerosol optical events were observed during the summer of 2007 at the High Arctic atmospheric observatory (PEARL) located at Eureka, Nunavut, Canada. Half of these events could be traced to forest fires in southern and eastern Russia and the Northwest Territories of Canada. The most notable findings were that (a) a c...
Citations
... The starphotometer calibration method is based on a Langley linear regression using equations (21) and (22) from (Ivănescu et al., 2021) M0 -S = -τ x + C ...
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... Since these processes occur regionally for distributed sources on the Korean Peninsula, we find that the distances of aerosol size change are smaller than those for change in optical depth (8.0 km with r(AOD) 500 greater than 0.85 ob-served by 4STAR). This is likely from a combination of factors, including the fact that AOD from new particle formation more than compensates for aerosol dilution, similarly to that found downwind of Canadian oil sand processing centers (Baibakov et al., 2021). For the distances reported, there are no periods exhibiting higher autocorrelation than those sampled from long-range transport in the Arctic (SR2011 Long). ...
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... Future work will also aim to compare AOD results obtained from star photometry to the technique described in this paper. The advantages of this approach rely on the low uncertainty of the star photometer measurements (0.01 AOD with the 2 star method [31]) and the same clear sky conditions for simultaneous data point comparison. This would allow an absolute calibration and the uncertainty of the exposed method could be better determined. ...
... AOD and almucantar sky radiance measurements are carried out using the CIMEL sun photometer/sky radiometer. Spectral deconvolution algorithm (SDA) retrievals can be employed to investigate high-frequency event-level studies (O'Neill et al., 2003), while the more comprehensive AERONET inversion algorithm (Dubovik and King, 2000) can be employed for lowfrequency, climatological-scale analysis (see Hesaraki et al., 2017, for a more detailed discussion). Publications on the use of AERONET retrievals and/or ground-based lidar data to characterize the properties of local dust events at high latitudes are also rare. ...
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... These measurements included aerosol particle size distribution, cloud condensation nuclei activity, composition, and total concentration. The aircraft has three integrated remote sensing instruments: a W-band cloud radar (NAW), an X-band precipitation radar (NAX), and an elastic backscatter cloud lidar (Wolde and Pazmany 2005;Wolde et al. 2019;Baibakov et al. 2016). The NAW has a nominal resolution of 30 -50 m and a minimum detectable signal of -30 dBZ at 1-km range. ...
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... The stellar photometry is proven to be a reliable technique for measuring nocturnal AOD, with an uncertainty of 0.02-0.03 (Baibakov et al., 2015;Pérez-Ramírez et al., 2011), which is currently the de facto reference for all nocturnal AOD measurements (O'Neill et al., 2016). As indicated by Berkoff et al. (2011), although the exoatmospheric lunar spectral irradiances between the first and third quarter (±90°lunar phase for full moon) nominally ranged from ∼10 5 to 10 6 of solar irradiance, they were four orders of magnitude greater than the brightest star, Sirius. ...
... Zhang et al., 2008). Nocturnal AOD measurements are vital to comprehensively elucidate the diurnal behaviors of aerosol optical properties (Barreto et al., 2017(Barreto et al., , 2019Román et al., 2020), nocturnal atmospheric mixed boundary layer structure (Huang et al., 2018;Li et al., 2017), new particle formation during Arctic haze events (Jokinen et al., 2017;Kulmala et al., 2013), and alter longwave radiative forcing via the interaction of aerosol-cloud at nighttime (Rosenfeld et al., 2008;Tao et al., 2012), especially for high latitude and Arctic pristine regions experienced long periods of darkness during winter (Baibakov et al., 2015;J. Zhang et al., 2008). ...
... The developments in moon (Berkoff et al., 2011;Barreto et al., 2013Barreto et al., , 2016 and star photometry (e.g. Pérez-Ramírez et al., 2011Baibakov et al., 2015) allow the acquisition of nighttime measurements, however, these measurements are limited in the inversion algorithms to retrieve the aerosol microphysical properties (Pérez-Ramírez et al., 2015;Torres et al., 2017). 5 Lidar networks such as EARLINET (European Aerosol Research LIdar NETwork; Pappalardo et al., 2014), LALINET (Latin American LIdar NETwork; Guerrero-Rascado et al., 2016;Antuña-Marrero et al., 2017) and MPLNET (Welton et al., 2002) provide information about aerosol vertical distribution. ...
... Devices designed with the aim of deployment in distant isolated locations, with possibly harsh and changing environmental conditions, require special means of supervision and maintenance to ensure their constant and infallible operation. Ivanescu et al. [6] presented some challenges of the telescope working in such conditions, which resulted in the need for constant supervision by a human operator. The demand for development of modern systems that allow easy and automated supervision or maintenance has recently been reported by Marchiori et al. [11]. ...
... In addition, d A (l) retrievals at night-time would provide additional constraints for lidar systems. To obtain d A (l) at night, different approaches have been developed using the moon (Esposito et al., 1998) or stars (Leiterer et al., 1998; Herber et al., 2002; Pé rez-Ramírez et al., 2008; Baibakov et al., 2010). The use of the moon as the radiation source presents the problem of the temporal variability of sun-reflected radiance. ...
