Search Results

You are looking at 1 - 10 of 2,754 items for :

  • Spectrometer x
  • All content x
Clear All
Martin K. Hill, Barbara J. Brooks, Sarah J. Norris, Michael H. Smith, Ian M. Brooks, and Gerrit de Leeuw

spectrometers capable of providing detailed size spectra typically have a temporal resolution no better than 1 Hz, and thus cannot resolve all the turbulent fluctuations in particle concentration; they also tend to be bulky and require a long sample line between the instrument and the sampling location—this incurs loss of particles to the wall of the sample line, introduces a lag time between aerosol and sonic turbulence wind measurements, and may further reduce the frequency response due to mixing within

Full access
James G. Hudson

DECEMBER 1989 JAMES G. HUDSON 1055An Instantaneous CCN Spectrometer JAMES G. HUDSONDesert Research Institute, University of Nevada System, Reno, Nevada(Manuscript received 30 November 1988, in final form 21 June 1989)ABSTRACT A thermal gradient diffusion cloud chamber with a supersaturation field that increases along the path of theflow of sample is used as a cloud condensation nucleus (CCN) spectrometer. The

Full access
Stuart G. Bradley, Stephen J. Adams, C. David Stow, and Stephen J. de Mora

AUGUST 1991 BRADLEY, ADAMS, STOW AND DE MORA 523An Improved Raindrop Chemistry SpectrometerSTUART G. BRADLEY,* STEPHEN J. ADAMS, * C. DAVID STOW * AND STEPHEN J. DE MORA~- Department of Physics and tDepartment of Chemistry, University of Auckland, Auckland, New Zealand(Manuscript received 20 July 1990, in final form 18 December 1990)ABSTRACT A spectrometer allowing size-fractional chemical analysis of raindrops has been described

Full access
N. Fukuta and V. K. Saxena

1352 JOURNAL OF APPLIED METEOROLOGY Vocu~El$A Horizontal Thermal Gradient Cloud Condensation Nucleus Spectrometer~ N. F~xv~A ~u'~)V. K. S~ac~NAsDep~rtment of Megeorology, Uni~er~ily of UMk, ~ Lake C~y ~4112(Manuscript r~eived 23 J~ 1979, in ~1 form 21 June 1979)ABSTRACT A new cloud condensation nuclei (CCN) spectrometer capable of simulating the desired range of cloudsupersaturation in a

Full access
D. T. HILLEARY, E. L. HEACOCK, W. A. MORGAN, R. H. MOORE, E. C. MANGOLD, and S. D. SOULES

June 1966Hilleory, Heacock, Morgan, Moore, Mangold, and Soules367INDIRECT MEASUREMENTSOF ATMOSPHERIC TEMPERATURE PROFILES FROM SATELLITES:111. THE SPECTROMETERS AND EXPERIMENTSD. T. HILLEARY, E. L. HEACOCK, W. A. MORGAN, R. H. MOORE*, E. C. MANGOLD**, AND S. D. SOULES National Environmental Satellite Center, Environmental Science Services Administration, Washington, D.C.ABSTRACTThree spectrometers and associated experiments are described. The work reviewed comprises the early experi

Full access
Norman C. Grody and Paul P. Pellegrino

~1o JOUKNAL Ol,' At'PLIED M~TE(JROLO(J- VOLUME16Synoptic-Scale Studies Using the Nimbus 6 Scnnning Microwave Spectrometer Novaltm C. GRon- A~D ~Arm P. Pvx.Lwap. t~o National Environmental $atdlite Service, NOAA, Wastington, D.C. 20233 (Manuscript received 22 November 1976, in revised form 29 June 1977)ABSTRACT Several frontal systems over Europe in August 1975 and January and

Full access
Robert G. Knollenberg

content measurements using conventional devices withthose integrated from optically measured drop size distributions. In clouds of low to medium droplet size(<30 # diameter) the liquid water content from a conventional hot wire device was found to be in excellentagreement with that determined with an optical array particle size spectrometer. In populations containingmore mature cloud droplets the integrated liquid water content from the spectrometer data is consistentlyhigher. This is attributed to

Full access
Rosario Q. Iannone, Daniele Romanini, Samir Kassi, Harro A. J. Meijer, and Erik R. Th Kerstel

anomaly (≈ δ 18 O-0.528 · δ 17 O). Still, such an approach is complex and carries a high risk of failure and, more principally, offers a poor temporal and spatial resolution. Recent advantages in the laser field have improved in situ measurements of atmospheric trace gases, as an alternative to more conventional methods. Semiconductor lasers enable the development of compact, stable, and reliable spectrometers. Diode-laser spectrometry offers several advantages over mass spectroscopy for precise in

Full access
Theodore W. Cannon and Walter W. Grotewold

JuLY 1980 N O T E S 901Improved Drop Generators for Calibration of Drop Spectrometers and Use in Laboratory Cloud Physics ExperimentsTHEODORE W. CANNON1 AND WALTER W. GROTEWOLDNational Center for Atmospheric Research,2 Boulder, CO 8030715 August 1979 and 3 May 1980ABSTRACT Drop generators have been developed at NCAR based on the

Full access
Jean-Louis Brenguier, Thierry Bourrianne, Afraniode Araujo Coelho, Jacques Isbert, Robert Peytavi, Dominique Trevarin, and Perry Weschler

about SPCs in the field of nuclear physics or aerosols, for example. In this paper, the discussion is focused more specifically on airborne measurements of cloud particles and is illustrated with measurements made with the Forward Scattering Spectrometer Probe (FSSP-100) and its improved version, the Fast-FSSP. Detailed information about the FSSP can be found in Dye and Baumgardner (1984) , Baumgardner et al. (1985) , Brenguier (1989) , and Baumgardner and Spowart (1990) . 2. Single particle

Full access