Engineering topics
Publications and source records attributed to Leblanc, T..
Using more than 800 profiles obtained by the DIAL-ozone lidar of the Jet Propulsion Laboratory (JPL) at the Mauna Loa Observatory (MLO), Hawaii, a wide range of temporal variability of stratospheric ozone is investigated.
A wide rage of temporal variability in stratospheric ozone profiles is investigated using more than 10 years of DIAL-ozone lidar measurements at the Jet Propulsion Laboratory (JPL), Table Mountain Facility (TMF), California.
We describe improvements to, and results from a lidar system for measurements of ozone profiles in the troposphere and lower stratosphere. The changes were primarily related to the optical receiver sub-systems and the data acquisition system.
Using more than 1600 nighttime profiles obtained by the Jet Propulsion Laboratory differential absorption lidars located at Table Mountain Facility (TMF, 34.4 degrees N) and Mauna Loa Observatory (MLO, 19.5 degrees N) stratospheric ozone climatology is presented in this paper.
Using more than 1600 nighttime profiles obtained by the JPL differential absorption lidars (DIAL) located at Table Mountain Facility (TMF, 34.4 N) and Mauna Loa Observatory (MLO, 19.5 N) is presented in this paper. These two systems have been providing high-resolution vertical profiles of ozone number density between 15-50 km, several nights a week since 1989 (TMF) and 1993 (MLO). The climatology presented here is typical of early night ozone values with only a small influence of the Pinatubo aerosols and the 11-year solar cycle. The observed seasonal and vertical structure of the ozone concentration at TMF is consistent with that typical of mid- to subtropical latitudes. A clear annual cycle in opposite phase below and above the ozone concentration peak is observed. The observed winter maximum below the ozone peak is associated with a maximum day-to-day variability, typical of a dynamically driven lower stratosphere. The maximum concentration observed in summer above the ozone peak emphasizes the more dominant role of photochemistry. Unlike TMF, the ozone concentration observed at MLO tends to be higher during the summer months and lower during the winter months throughout the entire stratospheric ozone layer. Only a weak signature of the extra-tropical latitudes is observed near 19-20 km, with a secondary maximum in late winter. The only large variability observed at MLO is associated with the natural variability of the tropical tropopause.
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The tidal signature in the middle atmospheric thermal structure (15-95 km) at Mauna Loa, Hawaii, (19.5is investigated using more than 145 hours of nighttime lidar measurements obtained during October 3-16, 1996 and October 2-11, 1997.
Long term measurements from several lidar instruments, located at 44.0 degree N, 40.6 degree N, 34.4 degree N, and 19.5 degree N, were used to develop a new climatology of the middle atmosphere temperature.
Results from new observations of mesospheric temperature inversion layers using long-term lidar measurements at mid- and low-latitudes are presented.
Temperature measurements in the middle atmosphere using Rayleigh lidars have been performed for several decades now.
The middle atmosphere (20 to 90 km altitude) has received increasing interest from the scientific community during the last decades, especially since such problems as polar ozone depletion and climatic change have become so important.
This paper describes a seasonal climatology of the middle atmosphere temperature derived from lidar measurements obtained at several mid- and low-latitude locations.
Using more than 145 hours of nighttime lidar measurements obtained during October 1-16, 1996 and October 2-11, 1997, the tidal signature in the middle atmopheric thermal structure (15-95 km) at Mauna Loa, Hawaii, is investigated.
The tidal signature in the middle atmospheric thermal structure is investigated using more than 140 hours of nighttime lidar measurements at Table Mountain (34.4 degrees north) during January 1997 and February 1998.