Search Results

You are looking at 21 - 30 of 912 items for :

  • Lidar observations x
  • Journal of the Atmospheric Sciences x
  • Refine by Access: All Content x
Clear All
Peter W. Henderson and Robert Pincus

possibility is the ground-based measurements made at observatories operated by the Atmospheric Radiation Measurement (ARM) and Cloudnet programs. These sites combine retrievals from upward-pointing active remote sensing instruments (radars and lidars) to produce long-term, high-frequency records of the vertical structure of clouds (e.g., Clothiaux et al. 2000 ). The main difficulty with using these observations is that they are pointlike, whereas model predictions are defined at the larger spatial scales

Full access
Kenneth Sassen

1444 JOURNAL OF THE ATMOSPHERIC SCIENCES VOLU~34Lidar Observations of High Plains Thunderstorm Precipitation KEIqtqETH SASSEN1Department of A tmosph~i~ Science, Univewity of V/ ytrmi~g, Laramie 82071 (Manuscript received 9 February t977, in revised form 16 May 1977)ABSTRACT The results of a field program using a polarization diversity lidar system to study high plains thunderstorm precipitation are

Full access
Maximilien Bolot and Stephan Fueglistaler

1. Introduction A common problem in many fields of atmospheric sciences, here discussed for the parameterization of ice water content and sedimentation flux from lidar observations, is that remote measurements often have to be supplemented with a priori information (henceforth also referred to as ancillary data) to estimate geophysical quantities of interest. This can create a challenge for operations involving statistics on measurements—such as estimating bulk properties for a whole range of

Free access
C. M. R. Platt

SEPTEMBER 1973 C. M. R. P L A TT 1191Lidar and Radiometric Observations of Cirrus Clouds C. ~[. R. PLATTDivision of Atmospheric Physics, CSIRO, A spendale, Victoria, Australia(Manuscript received 25 August 1972, in revised form 22 March 1973) ABSTRACT The technique of using combined lidar (0.694um) and radiometric (10-12 ~m) measurements on

Full access
Neil P. Lareau

. To this end, the goal of this study is to provide observational statistics and physical descriptions of subcloud and cloud-base water vapor fluxes associated with shallow cumulus convection over land. This work innovates on a previous Doppler lidar study of cloud-base mass fluxes ( Lareau et al. 2018 ; hereafter LZK18 ) by combining the Doppler lidar observations of vertical velocity with Raman lidar observations of the water vapor mixing ratio to probe the statistics and physics of water vapor

Open access
Neil P. Lareau, Yunyan Zhang, and Stephen A. Klein

representative ShCu day in terms of satellite and lidar observations. The visible satellite imagery [1410 CST from MODIS Aqua satellite] indicates a broad region of shallow cumuli spanning Oklahoma wherein cloud fraction and horizontal cloud size increase from northwest to southeast. The corresponding DL vertical velocity, derived CBL height, and cloud-base detections are shown in Fig. 2b and are illustrative of a typical ShCu day evolution: rapidly growing CBL in the morning, slower CBL growth in the

Open access
David Atlas and Zhien Wang

1. Introduction We have had a longstanding interest in the nature and origin of contrails both from the point of view of the cloud physics and from the continuing concern about their influence on climate. On the morning of 5 December 2008, the lead author observed a plethora of contrails to the west of his home in Silver Spring, Maryland. He photographed these throughout much of the day and obtained corresponding data by lidar and satellite observations online from the National Aeronautics and

Full access
R. T. H. Collis and M. G. H. Ligda

heating in the Martian atmosphere. J. Atmos. Sci., 22, 97-109.Roach, W. T., 1961: The absorption of solar radiation by water vapor and carbon dioxide in a cloudless atmosphere. Quart. J. R. Meteor. So-., 87, 364-373.Note on Lidar Observations of Particulate Matter in the StratosphereR. T. H. Con~xs AND M. G. H. LIGDAStanford Research Institute, Menlo Park, Calif.1 November 1965 and 14 December 1965 Numerous lidar observations here have revealedlayers and patches of particulate matter in the

Full access
M. T. Philip, G. S. Kent, and M. T. Ottway

I M^- 1985 M.T. PHILIP, G, S. KENT AND M. T. OTTWAY 967Lidar Observations of the Stratospheric Aerosol Layer over Kingston, JamaicaM. T. PHILIP, G. S. KENTt AND M. T. OTTWAY*University of the West Indies, Kingston, Jamaica(Manuscript received 11 July 1984, in final form 22 January 1985)ABSTRACT Results are presented from an intensive study of the stratospheric aerosol layer over Kingston, Jamaica,made in 1978

Full access
Philippe Drobinski, Pierre Carlotti, Jean-Luc Redelsperger, Valery Masson, Robert M. Banta, and Rob K. Newsom

-resolution Doppler lidar able to map in three dimensions the coherent structures in the PBL. The target of the present paper is therefore to (i) investigate the multiscale nature of the turbulent eddies in the SL; (ii) to explain the existence of a −1 power law in the velocity fluctuation spectra already shown in Drobinski et al. (2004) ; and (iii) to investigate the different nature of turbulence in the two sublayers within the SL defined by Drobinski et al. (2004) , which are the eddy surface layer (ESL

Full access