Search Results

You are looking at 11 - 20 of 1,462 items for :

  • Planetary atmospheres x
  • Journal of Applied Meteorology and Climatology x
  • User-accessible content x
Clear All
H. N. Lee and J. K. Shi

problemsin the atmosphere are presented. The method introduces the evaluation of a polynomial function when thesolution is expressed as the sum of a periodic function and a polynomial function. The periodic function isthen treated by Fourier expansion. In the paper, the accuracy of method has been demonstrated. Numericalresults for a system of time dependent equations, modeling the atmospheric planetary boundary layer flow andnocturnal flow over terrain are encouraging. The method offers a promising

Full access
Carl W. Benkley and Lloyd L. Schulman

7?2 JOURNAL OF APPLIED METEOROLOGY VOLUME18Estimating Hourly Mixing Depths from Historical Meteorological Data CARL W. BENX~- AND LLOYD L. SCHULMANE~ironrn~al P,z~earch ~' T~-h#olog~, Ir~., /~w/~gto~, M A 02173(Manuscript received 7 November 1978, in final form 9 February 1979)ABSTRACT The planetary boundary layer is defined as the layer of the lower atmosphere whose characteristicsare

Full access
R. T. Pinker, J. A. Ewing, and J. D. Tarpley

atmosphere and at the surface. They alsostate that "... the extent to which the planetary andsurface budgets are correlated has not been established.The whole issue of whether or not satellite monitoringof changes in the net radiation balance at the top ofthe atmosphere is indicative of changes in (surface)climate hinges on this correlation." In a study conducted over the central United States(Pinker and Corio, 1984), it was shown that the netradiation and the outgoing longwave radiation at thetop of

Full access
B. Pinty and D. Ramond

~.~, 0.$ ILl PLRNETRRY RLBEDO (18 FEBRURRY FIG. 4a. Planetary albedo.for 2 July against planetary albedo for18 February. For both days the values are calculated at 1130 UTCusing (12).a. Atmospheric effects In order to appreciate the ability of the ratio technique to remove the masking effect due to the atmosphere, the relationship between the planetary albedoson 18 February and 2 July (Fig. 4a) can be comparedto the one obtained for the corresponding surface albedos (Fig. 4b) over

Full access
P. Koepke and K. T. Kriebel

of the atmosphere and the surface lead to errors in the derived net fluxes at the top andthe bottom of the atmosphere and in the derived surface albedo. The errors for cloud-free situations over land,which this paper is only concerned with, arc analyzed by simulation, using measured surface bidirectionalreflectance functions and realistic values of the optical parameters of the atmosphere, including gas and aerosolabsorption and multiple scattering. To derive surface albedo from planetary albedo

Full access
Mika Peace, Trent Mattner, Graham Mills, Jeffrey Kepert, and Lachlan McCaw

(dry intrusions, red). Fluctuations in relative humidity extend up to 10 km laterally from the head fire. The dark blue areas show that fire–atmosphere interactions increased the depth of the planetary boundary layer by more than 500 m. Some dry air entrainment from above the inversion (red and orange) can be seen. It is difficult to infer any implications for fuel moisture, as the simulations do not include a fine fuel moisture response. However, it appears likely that such effects would be

Full access
R. W. Bergstrom Jr. and R. Viskanta

participating pollutants upon the temperature distribution in theboundary layer of the urban atmosphere is predicted. This is accomplished by constructing a mathematicalmodel for atmospheric radiation transfer and one-dimensional mass, momentum and energy transportin the planetary boundary layer. The atmosphere, consisting of gaseous and particulate pollutants aswell as natural constituents, is considered to absorb, emit and scatter anisotropicMly radiant energy.A series of numerical simulations of the

Full access
H. N. Lee and S. K. Kao

Conference On Numerical Methods In Laminar and Turbulent Flow, University College Swansea, Pentech Press, London, 203-230.Blackadar, A. K., 1962: The vertical distribution of wind and turbulent exchange in a neutral atmosphere. J. Geophys. Res., 67, 3095-3102.Deardorff, J. W., 1970a: A three-dimensional numerical investiga tion of the idealized planetary boundary layer. Geophys. Fluid Dyn., 1, 377-410. , 1970b: A numerical study of three-dimensional t~rbulent channel flow at large Reynolds

Full access
Andrew R. Lare and Sharon E. Nicholson

. Using irradianceat the top of the atmosphere as a forcing function, the model calculates global radiation, atmospheric heating,ground-absorbed solar radiation and planetary or top albedo. Sensitivity studies show that submedium absorptionof solar radiation is primarily affected by surface albedo and cloudiness; the aerosol content of the heavily dustladen Sahel atmosphere has little effect. A comparison with time series approximating global radiation on clearand partly cloudy days shows that the

Full access
Robert D. Cess and Gerald L. Potter

DECEMBER 1986 ROBERT D. CESS AND GERALD L. POTTER 1977Narrow- and Broad-Band Satellite Measurements of Shortwave Radiation: Conversion Simulations with a General Circulation Model ROBERT D. CESSLaboratory for Planetary Atmospheres Research, State University of New York, Stony Brook, NY 11794 GERALD L. POTTERLawrence Livermore National Laboratory, University of California, Livermore

Full access