Search Results - "Sica, R. J"

Validation of optimal estimation method retrievals of middle atmospheric temperature by Jalali, Ali, Sica, R. J., Haefele, Alexander

“…OEM (Optimal Estimation Method) retrievals of temperature from lidar measurements are robust and practical (Sica and Haefele, 2015). They offer significant…”
Get full text

Stratospheric Ozone Density Retrieval Using the Optimal Estimation Method (OEM) by Farhani, Ghazal, Sica, R. J., Godin-Beekmann, Sophie, Haefele, Alexander

“…We use an Optimal Estimation Method (OEM) to retrieve ozone profiles from the CANDAC Stratospheric Ozone Differential Absorption Lidar in Eureka, Canada. The…”
Get full text

Investigating potential wet bias in the Purple Crow Lidar water vapor measurements by VanKerkhove, Jeffrey, Sica, R. J., Wing, R., Argall, P. S.

“…The Purple Crow Lidar is a large aperture lidar, capable of retrieving water vapor into the strato-sphere. A comparison with the ALVICE lidar in 2012 showed…”
Get full text

How to apply the optimal estimation method to your lidar measurements for improved retrievals of temperature and composition by Sica, R. J., Haefele, A., Jalali, A., Gamage, S., Farhani, G.

“…The optimal estimation method (OEM) has a long history of use in passive remote sensing, but has only recently been applied to active instruments like lidar…”
Get full text

The high Arctic in extreme winters: vortex, temperature, and MLS and ACE-FTS trace gas evolution by Manney, G. L., Daffer, W. H., Strawbridge, K. B., Walker, K. A., Boone, C. D., Bernath, P. F., Kerzenmacher, T., Schwartz, M. J., Strong, K., Sica, R. J., Krüger, K., Pumphrey, H. C., Lambert, A., Santee, M. L., Livesey, N. J., Remsberg, E. E., Mlynczak, M. G., Russell III, J. R.

“…The first three Arctic winters of the ACE mission represented two extremes of winter variability: Stratospheric sudden warmings (SSWs) in 2004 and 2006 were…”
Get full text

Calibration and validation of water vapour lidar measurements from Eureka, Nunavut, using radiosondes and the Atmospheric Chemistry Experiment Fourier Transform Spectrometer by Moss, A, Sica, R. J, McCullough, E, Strawbridge, K, Walker, K, Drummond, J

“…The Canadian Network for the Detection of Atmospheric Change and Environment Canada DIAL lidar located at the Polar Environment Atmospheric Research Laboratory…”
Get full text

Assessment of the quality of OSIRIS mesospheric temperatures using satellite and ground-based measurements by Sheese, P. E, Strong, K, Llewellyn, E. J, Gattinger, R. L, Russell III, J. M, Boone, C. D, Hervig, M. E, Sica, R. J, Bandoro, J

“…The Optical Spectrograph and InfraRed Imaging System (OSIRIS) on the Odin satellite is currently in its 12th year of observing the Earth's limb. For the first…”
Get full text

A comparison of Rayleigh and sodium lidar temperature climatologies by ARGALL, P. S, SICA, R. J

“…Temperature measurements from the PCL Rayleigh lidar located near London, Canada, taken during the 11 year period from 1994 to 2004 are used to form a…”
Get full text

Model-measurement comparison of mesospheric temperature inversions, and a simple theory for their occurrence by Sica, R. J., Argall, P. S., Shepherd, T. G., Koshyk, J. N.

“…Mesospheric temperature inversions are well established observed phenomena, yet their properties remain the subject of ongoing research. Comparisons between…”
Get full text

Seasonal and nightly variations of gravity-wave energy density in the middle atmosphere measured by the Purple Crow Lidar by SICA, R. J, ARGALL, P. S

“…The Purple Crow Lidar (PCL) is a large power-aperture product monostatic Rayleigh-Raman-Sodium-resonance-fluorescence lidar, which has been in operation at the…”
Get full text

Composition changes during disturbed conditions: Are mass spectrometers overestimating the concentrations of atomic oxygen? by Russell, A. T., St.-Maurice, J.-P., Sica, R. J., Noël, J.-M.

“…Mass spectrometer measurements during disturbed conditions have shown that heavier gases like N2 and Ar can be substantially enhanced while lighter gases like…”
Get full text

How many waves are in the gravity wave spectrum? by Sica, R. J., Russell, A. T.

“…Parametric modelling of density perturbation measurements obtained with the University of Western Ontario's Purple Crow Lidar on 5 nights are used to infer…”
Get full text

A Calibration of the MeteoSwiss RAman Lidar for Meteorological Observations (RALMO)Water Vapour Mixing Ratio Measurements using a Radiosonde Trajectory Method by Hicks-Jalali, Shannon, Sica, R.J., Haefele, Alexander, Martucci, Giovanni

“…With only 50% downtime from 2007-2016, the RALMO lidar in Payerne, Switzerland, has one of the largest continuous lidar data sets available. These measurements…”
Get full text

First application of the optimal estimation method to retrieve temperature from pure rotational raman scatter lidar measurements by Gamage, S. Mahagammulla, Haefele, A., Sica, R.J.

“…We present the application of the Optimal Estimation Method (OEM) to retrieve atmospheric temperatures from pure rotational Raman (PRR) backscatter lidar…”
Get full text

A 7-Year Lidar Temperature Climatology of the Mid-Latitude Upper Troposphere and Stratosphere by Iserhienrhien, B., Sica, R. J., Argall, P. S.

“…The Purple Crow Lidar (PCL) is a large power-aperture product monostatic laser radar which until 2010 was located at the Delaware Observatory (42°52′N,…”
Get full text

Extending and Merging the Purple Crow Lidar Temperature Climatologies Using the Inversion Method by Jalali, Ali, Sica, R.J., Argall, P. S.

“…Rayleigh and Raman scatter measurements from The University of Western Ontario Purple Crow Lidar (PCL) have been used to develop temperature climatologies for…”
Get full text

Automating the Purple Crow Lidar by Hicks, Shannon, Sica, R.J., Argall, P.S.

“…The Purple Crow LiDAR (PCL) was built to measure short and long term coupling between the lower, middle, and upper atmosphere. The initial component of my MSc…”
Get full text

Observations of high-frequency temporal gravity wave spectra in the middle upper stratosphere by Russell, A. T., Sica, R. J.

“…There is a paucity of high‐frequency temporal gravity wave spectra in the middle upper stratosphere (30–40 km) as most instruments that are capable of…”
Get full text

Validation of the Atmospheric Chemistry Experiment (ACE) version 2.2 temperature using ground-based and space-borne measurements by Sica, R. J., Izawa, M. R. M., Walker, K. A., Boone, C., Petelina, S. V., Argall, P. S., Bernath, P., Burns, G. B., Catoire, V., Collins, R. L., Daffer, W. H., De Clercq, C., Fan, Z. Y., Firanski, B. J., French, W. J. R., Gerard, P., Gerding, M., Granville, J., Innis, J. L., Keckhut, P., Kerzenmacher, T., Klekociuk, A. R., Kyrö, E., Lambert, J. C., Llewellyn, E. J., Manney, G. L., McDermid, I. S., Mizutani, K., Murayama, Y., Piccolo, C., Raspollini, P., Ridolfi, M., Robert, C., Steinbrecht, W., Strawbridge, K. B., Strong, K., Stübi, R., Thurairajah, B.

“…An ensemble of space-borne and ground-based instruments has been used to evaluate the quality of the version 2.2 temperature retrievals from the Atmospheric…”
Get full text

Modulation of upper mesospheric temperature inversions due to tidal-gravity Wave interactions by Sica, R.J, Thayaparan, T, Argall, P.S, Russell, A.T, Hocking, W.K

“…Two nights of coincident measurements with the University of Western Ontario's MF radar and Purple Crow Lidar have been extensively analyzed to illustrate the…”
Get full text