Search Results

You are looking at 101 - 110 of 3,938 items for :

  • Lidar observations x
  • User-accessible content x
Clear All
Timothy D. Crum, Roland B. Stull, and Edwin W. Eloranta

774 JOURNAL OF CLIMATE AND APPLIED METEOROLOGY VOLUME26Coincident Lidar and Aircraft Observations of Entrainment into Thermals and Mixed Layers TIMOTHY D. CRUM,* ROLAND B. STULL, AND EDWIN W. ELORANTABoundary Layer Research Team, Department of Meteorology, University of Wisconsin, Madison, W133706(Manuscript received 1 July 1986, in final fo,rm 23 December 1986) Coincident observations of the daytime

Full access
Timothy J. Beatty, Chris A. Hostetler, and Chester S. Gardner

15MARCH 1992 BEATTY ET AL. 477Lidar Observations of Gravity Waves and Their Spectra near the Mesopause and Stratopause at AreciboTIMOTHY J. BEATTY, CHRIS A. HOSTETLER, AND CHESTER S. GARDNERDepartment of Electrical & Computer Engineering, Everitt Laboratory, Urbana, Illinois(Manuscript received 31 May 1990, in final form 16 July 1991)ABSTRACT The UIUC CEDAR Rayleigh

Full access
Zhiqiang Cui, Zhaoxia Pu, G. David Emmitt, and Steven Greco

brightness shaded for case 1 and case 2 in all experiments. The locations of DAWN lidar wind profile observations in the two cases are also marked during 15 and 20 June 2017, respectively. Specifically, for case 1, the sizes of the model grids are 163 × 147, 196 × 196, 367 × 295, and 661 × 442 in order from the outermost to innermost domains. The intermediate two-level nested domains cover most of the DAWN data collection area, and the innermost domain corresponds to the main area where the mesoscale

Open access
James R. Campbell, Cui Ge, Jun Wang, Ellsworth J. Welton, Anthony Bucholtz, Edward J. Hyer, Elizabeth A. Reid, Boon Ning Chew, Soo-Chin Liew, Santo V. Salinas, Simone Lolli, Kathleen C. Kaku, Peng Lynch, Mastura Mahmud, Maznorizan Mohamad, and Brent N. Holben

satellite and complicating passive ground-based observations. An example of this is shown in Fig. 4 for 26 September, taken from the NASA Moderate Resolution Infrared Spectroradiometer (MODIS; King et al. 2003 ), aboard the Aqua satellite, and the Cloud–Aerosol Lidar with Orthogonal Polarization (CALIOP) instrument aboard the Cloud–Aerosol Lidar and Infrared Pathfinder Satellite Observations ( CALIPSO ) platform; Winker et al. 2010 ). The two instruments are flown in sequence in the NASA A

Full access
Andreas Schäfler, Andreas Dörnbrack, Christoph Kiemle, Stephan Rahm, and Martin Wirth

simultaneous and collocated measurements of the atmospheric variables υ h and q . Meteorological towers and airborne or balloonborne in situ observations provide this information at specific locations and along flight trajectories. However, observations covering larger areas and the complete troposphere are only possible with high-flying aircraft equipped with nadir-pointing remote sensing instruments. During recent years, airborne lidar measurements of both wind and water vapor have been performed to

Full access
L. P. Riishøjgaard, R. Atlas, and G. D. Emmitt

remains a high priority for the global observing system. Such observations are expected to be especially valuable in situations in which the balance assumptions used for assimilation of satellite sounding data are invalid and in regions where the geostationary wind observations are either poor or missing altogether. A spaceborne Doppler wind lidar (DWL) is one of the candidate systems for providing these data. The measurement principle is based on the fact that the Doppler shift of the return from an

Full access
Martin Weissmann, Andreas Dörnbrack, and James D. Doyle

line that is generated by boundary layer separation resulting from strong downslope winds and lifted aloft by the lee wave circulation ( Doyle et al. 2009 ). Some of the major challenges for T-REX are to observe these subrotor vortices, to estimate the strength of the horizontal vorticity, and to investigate their characteristics. In this study, high-resolution scanning Doppler lidar observations taken during T-REX are analyzed, and a method for deriving tangential velocity V ϕ and vorticity

Full access
Jared W. Marquis, Mayra I. Oyola, James R. Campbell, Benjamin C. Ruston, Carmen Córdoba-Jabonero, Emilio Cuevas, Jasper R. Lewis, Travis D. Toth, and Jianglong Zhang

they represent increased noise and/or cloud contamination. The mean backscatter profile within determined aerosol layer(s) is then converted to total, fine-mode, and coarse-mode aerosol extinction using the aforementioned Fernald inversion constrained by the spatial and temporally collocated AERONET observations. To QC the retrievals, we only examine profiles with the (Fernald inversion retrieved) 550 nm extinction-to (MPL observed)–532 nm backscatter ratios (i.e., lidar ratio; Ackermann 1998

Open access
Stuart A. Young and Mark A. Vaughan

1. Introduction The Cloud-Aerosol Lidar Infrared Pathfinder Satellite Observations (CALIPSO) mission ( Winker et al. 2003 ) joined the A-Train ( Stephens et al. 2002 ) constellation of satellites in late April 2006 and began acquiring scientific data in mid-June of that year. CALIPSO carries three, coaligned, nadir-viewing instruments: a dual-wavelength, dual-polarization lidar ( Winker et al. 2007 ), an imaging infrared radiometer ( Chomette et al. 2003 ) and a wide-field camera ( Pitts et al

Full access
G. Beyerle, M. R. Gross, D. A. Haner, N. T. Kjome, I. S. McDermid, T. J. McGee, J. M. Rosen, H.-J. Schäfer, and O. Schrems

. The objective of the campaign and purpose of this study is twofold. First, the measurements enhance the dataset on occurrence frequencies of visible and subvisible cirrus clouds at midlatitude. Second, ground-based lidar observations of the tropo- and stratosphere are an integral part of the Network for the Detection of Stratospheric Change (NDSC) where they provide information on trace gas concentrations, temperature, aerosol content, and cloud occurrences. The high-quality level of the NDSC

Full access