A5006941272- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Arctic and Antarctic ice dynamics
- Climate change and permafrost
- Atmospheric Ozone and Climate
- Methane Hydrates and Related Phenomena
- Cryospheric studies and observations
- Climate variability and models
- Meteorological Phenomena and Simulations
- Environmental Monitoring and Data Management
- Advanced Scientific Techniques and Applications
- Water Quality Monitoring and Analysis
- Leaf Properties and Growth Measurement
- Maritime Transport Emissions and Efficiency
- Calibration and Measurement Techniques
- Offshore Engineering and Technologies
Dalhousie University
2011-2020
[1] The meridional transport of water vapor into the High Arctic, accompanied by dry enthalpy and clouds, impacts surface radiative forcing. evolution one such moist intrusion over 9–11 February 2010 is presented. event analyzed using a unique blend measurements including new pan-Arctic retrieval column from Microwave Humidity Sounders, profiles Raman lidar ground-based microwave radiometer at Polar Environment Atmospheric Research Laboratory (PEARL), in Eureka (80°N, 86°W), on Ellesmere...
Abstract. As a consequence of dynamically variable meteorological conditions, springtime Arctic ozone levels exhibit significant interannual variability in the lower stratosphere. In winter 2011, polar vortex was strong and cold for an unusually long time. Our research site, located at Eureka, Nunavut, Canada (80.05° N, 86.42° W), mostly inside from October 2010 until late March 2011. The Bruker 125HR Fourier transform infrared spectrometer installed Polar Environment Atmospheric Research...
Abstract. 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 High Arctic (80° N, 86° W). In spring 2011 2012, a star photometer was employed to acquire depth (AOD) data, while vertical backscatter profiles were measured using CANDAC Raman Lidar (CRL). used simple coefficient threshold (βthr) distinguish aerosols from clouds and, assuming that...
Aerosols from the Sarychev Peak volcano entered Arctic region less than a week after strongest SO 2 eruption on June 15 and 16, 2009 had, by first in July, spread out over entire region. These predominantly stratospheric aerosols were determined to be sub‐micron size inferred composed of sulphates produced condensation gases emitted during eruption. Average (500 nm) Sarychev‐induced optical depths (SOD) Polar Environmental Atmospheric Research Laboratory (PEARL) at Eureka (Nunavut, Canada)...
Abstract A Rayleigh–Mie–Raman lidar has been installed and is operating in the Polar Environment Atmospheric Research Laboratory at Eureka High Arctic (79°59′N, 85°56′W) as part of Canadian Network for Detection Change. The operates both visible ultraviolet measures aerosol backscatter extinction coefficients, depolarization ratio, tropospheric temperature, water vapor mixing ratio. Variable field view, aperture, filtering allow fine-tuning instrument different atmospheric conditions....
Abstract. A new microwave satellite water vapour retrieval for the polar winter atmosphere is presented. The builds on work of Miao et al. (2001) and Melsheimer Heygster (2008), employing auxiliary information atmospheric conditions numerical optimization. It was tested using simulated actual measurements from Microwave Humidity Sounder (MHS) instruments. Ground truth provided by G-band radiometer (GVR) at Barrow, Alaska. For columns less than 6 kg m−2, comparisons between GVR result in a...
Abstract. The Canadian Network for the Detection of Atmospheric Change (CANDAC) Rayleigh–Mie–Raman lidar (CRL) at Eureka, Nunavut, has measured tropospheric clouds, aerosols, and water vapour since 2007. In remote meteorologically significant locations, such as High Arctic, ability to add new measurement capability an existing well-tested facility is extremely valuable. 2010, linear depolarization 532 nm hardware was installed in lidar's receiver. To minimize disruption channels preserve...
Wintertime Arctic surface emissivities are retrieved from Advanced Technology Microwave Sounder (ATMS) passive microwave measurements at 88.2, 165.5, and 183.31 GHz. Surface emitting layer temperatures simultaneously Random errors in estimated to be 2.0%, 3.5% GHz, respectively, the random 4.3 K. A series of tests on products reveal that land sea ice Lambertian reflectors ocean is a specular reflector. The show broad agreement with published databases, differences partly due uncertainties...
Abstract. Linear depolarization measurement capabilities were added to the CANDAC Rayleigh–Mie–Raman lidar (CRL) at Eureka, Nunavut, in Canadian High Arctic 2010. This upgrade enables measurements of phases (liquid versus ice) cold and mixed-phase clouds throughout year, including during polar night. Depolarization calibrated according existing methods using parallel- perpendicular-polarized profiles as discussed ). We present a new technique that uses polarization-independent Rayleigh...
Abstract. We present recent progress related to the night-time retrievals of aerosol and cloud optical depth using starphotometry over PEARL (Polar Environmental Atmospheric Research Laboratory) station at Eureka (Nunavut, Canada) in High Arctic (80° N, 86° W). In spring 2011 2012, SPSTAR starphotometer was employed acquire (AOD) measurements while vertical backscatter coefficient profiles were acquired CANDAC Raman Lidar (CRL). Several events detected characterized starphotometry-lidar...
Abstract. A new microwave satellite water vapour retrieval for use in polar winter conditions is presented. The employs a priori information and an iterative approach. It tested using simulated actual measurements from the Microwave Humidity Sounder (MHS) instruments. Ground truth provided by G-band vapor radiometer (GVR) at Barrow, Alaska. For columns less than 6 kg m−2, comparison with GVR gives standard deviation of 0.39 m−2 systematic bias 0.08 m−2. errors are shown to be significantly...
Abstract. As a consequence of dynamically variable meteorological conditions, springtime Arctic ozone levels exhibit significant interannual variability in the lower stratosphere. In winter 2011, polar vortex was strong and cold for an unusually long time. Our research site, located at Eureka, Nunavut, Canada (80.05° N, 86.42° W), mostly inside from October 2010 until late March 2011. The Bruker 125HR Fourier transform infrared spectrometer installed Polar Environment Atmospheric Research...
Abstract. Linear depolarization measurement capabilities were added to the CANDAC Rayleigh-Mie-Raman lidar (CRL) at Eureka, Nunavut, in Canadian High Arctic 2010. This upgrade enables measurements of phases (liquid versus ice) cold and mixed-phase clouds throughout year, including during polar night. Depolarization calibrated according existing methods using parallel- perpendicular-polarized profiles as discussed McCullough et al. (2017). We present a new technique that uses...
Abstract. A methodology for retrieving high-latitude winter water vapour columns from passive microwave satellite measurements Perro et al. (2016) is extended to use measured surface reflectance ratios under more realistic reflection assumptions. Pan-Arctic wintertime retrieved Advanced Technology Microwave Sounder (ATMS) made January 2012 through March 2015 (December March). The retrievals are validated using two ground based instruments: the G-band Vapor Radiometer (GVR) at Barrow, Alaska,...