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Author: Robert T Williams (Jr)
Publisher:
ISBN: 9781423570752
Category :
Languages : en
Pages : 132
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Book Description
Calculation of electromagnetic (EM) propagation in the littoral (marine coastal zone) can be a challenging problem for current numerical propagation models because of the sparsity of meteorological data necessary to describe the propagation medium. It is believed, however, that with sufficient improvement such models can simulate characteristics of the marine boundary layer depth, inversion height, and inversion strength, on temporal scales from an hour to several days. It may also be possible to estimate the subgrid scale statistics of the critical fields. The Penn State/National Center for Atmospheric Research non-hydrostatic mesoscale model (MM5) is used to test the predictability of marine temperature and moisture structures in the coastal zone of Southern California during the VOCAR (Variability of Coastal Atmospheric Refractivity) experiment of 1993. Hundreds of soundings taken at several sites in the VOCAR study area are analyzed to characterize the dependence of atmospheric refractivity and marine layer structure on time of day and distance offshore. High vertical resolution numerical simulations are performed using MMS and are evaluated against the special data over a period of about one week. The ability of a mesoscale numerical model to predict both short term (1-6 hours) and longer range (days) variations in marine layer structure and refractivity is demonstrated. The major conclusions are that the numerical model is capable of predicting (1) the basic evolution of marine boundary layer depth over a period of 7 days, (2) inversion structures in temperature and water vapor that account for the observed strength of trapping and ducting layers in the refractivity (M) profiles, and (3) gravity wave propagation in and above the marine boundary layer
Author: Robert T Williams (Jr)
Publisher:
ISBN: 9781423570752
Category :
Languages : en
Pages : 132
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Book Description
Calculation of electromagnetic (EM) propagation in the littoral (marine coastal zone) can be a challenging problem for current numerical propagation models because of the sparsity of meteorological data necessary to describe the propagation medium. It is believed, however, that with sufficient improvement such models can simulate characteristics of the marine boundary layer depth, inversion height, and inversion strength, on temporal scales from an hour to several days. It may also be possible to estimate the subgrid scale statistics of the critical fields. The Penn State/National Center for Atmospheric Research non-hydrostatic mesoscale model (MM5) is used to test the predictability of marine temperature and moisture structures in the coastal zone of Southern California during the VOCAR (Variability of Coastal Atmospheric Refractivity) experiment of 1993. Hundreds of soundings taken at several sites in the VOCAR study area are analyzed to characterize the dependence of atmospheric refractivity and marine layer structure on time of day and distance offshore. High vertical resolution numerical simulations are performed using MMS and are evaluated against the special data over a period of about one week. The ability of a mesoscale numerical model to predict both short term (1-6 hours) and longer range (days) variations in marine layer structure and refractivity is demonstrated. The major conclusions are that the numerical model is capable of predicting (1) the basic evolution of marine boundary layer depth over a period of 7 days, (2) inversion structures in temperature and water vapor that account for the observed strength of trapping and ducting layers in the refractivity (M) profiles, and (3) gravity wave propagation in and above the marine boundary layer
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 132
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Book Description
Calculation of electromagnetic (EM) propagation in the littoral (marine coastal zone) can be a challenging problem for current numerical propagation models because of the sparsity of meteorological data necessary to describe the propagation medium. It is believed, however, that with sufficient improvement such models can simulate characteristics of the marine boundary layer depth, inversion height, and inversion strength, on temporal scales from an hour to several days. It may also be possible to estimate the subgrid scale statistics of the critical fields. The Penn State/National Center for Atmospheric Research non-hydrostatic mesoscale model (MM5) is used to test the predictability of marine temperature and moisture structures in the coastal zone of Southern California during the VOCAR (Variability of Coastal Atmospheric Refractivity) experiment of 1993. Hundreds of soundings taken at several sites in the VOCAR study area are analyzed to characterize the dependence of atmospheric refractivity and marine layer structure on time of day and distance offshore. High vertical resolution numerical simulations are performed using MMS and are evaluated against the special data over a period of about one week. The ability of a mesoscale numerical model to predict both short term (1-6 hours) and longer range (days) variations in marine layer structure and refractivity is demonstrated. The major conclusions are that the numerical model is capable of predicting (1) the basic evolution of marine boundary layer depth over a period of 7 days, (2) inversion structures in temperature and water vapor that account for the observed strength of trapping and ducting layers in the refractivity (M) profiles, and (3) gravity wave propagation in and above the marine boundary layer
Author: Williams, Jr. (Robert Travis)
Publisher:
ISBN:
Category : Boundary layer (Meteorology)
Languages : en
Pages : 228
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Book Description
Author:
Publisher:
ISBN:
Category : Geophysics
Languages : en
Pages : 612
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 226
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Book Description
Author: Stephen Robert Lightfoote
Publisher:
ISBN: 9781109671704
Category :
Languages : en
Pages :
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Book Description
Surface and upper air meteorological variables and sea surface temperature observations for the period of April-August 2005, 2006 and 2007 were analyzed to determine the vertical structure, temporal variability, and controlling parameters of the Central California Coastal Marine Atmospheric Boundary Layer (MABL) focusing at Bodega Bay, CA. In addition, atmospheric simulations using the Weather Research and Forecasting (WRF) model were performed for the month of June 2006 to determine the dominant coastal weather regimes during summer. Lastly, a sensitivity study was performed to determine the effect on short time scales of the magnitude of the surface fluxes of sensible and latent heat on the MABL structure during an upwelling and relaxation period. Observational results confirm that semi-persistent coastal upwelling during summer leads to the presence of a cool, shallow marine layer capped aloft by a stable subsidence inversion and to the east by the coastal topography. In addition, a Low Level Jet is located near the base of the inversion. Stability analysis indicates that on average the shallow surface layer is below the critical Richardson # (Rc~0.25) suggesting the presence of turbulence. The value of the Richardson # on average increases at the base of the subsidence inversion and remains supercritical (Rb>1.0) above the inversion base, suggesting laminar flow aloft. Spectral analysis indicates that the diurnal and synoptic wavelengths dominate the temporal variability of the MABL height parameter during the summertime. Lag correlation values of MABL depth with variables indicative of upwelling strength are consistent with a conceptual framework in which temporal changes in MABL depth are at least partially controlled by changes in upwelling strength. Model results confirm the presence of three dominant coastal weather regimes at Bodega Bay: Upwelling, Relaxation, and a special case known as a Coastally Trapped Wind Reversal. Lastly, the results of the sensitivity study indicate that over short time scales (~1 day), the flux of heat at the surface is not significant in determining the MABL depth during an upwelling regime, but that it may be significant during a relaxation period.
Author: Maria K. Filonczuk
Publisher:
ISBN:
Category : Fog
Languages : en
Pages : 286
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Book Description
Author: Maithili Sharan
Publisher: Birkhäuser
ISBN: 9783764384920
Category : Science
Languages : en
Pages : 1880
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Book Description
This volume contains many original findings on mesoscale processes in atmospheric and oceanic systems through mathematical modeling, numerical simulations and field experiments. These scientific papers examine and provide the latest developments on a range of topics that include tropical cyclones/hurricanes, mesoscale variability and modeling, seasonal monsoons and land surface processes including atmospheric boundary layer.
Author:
Publisher:
ISBN:
Category : Atmospheric turbulence
Languages : en
Pages : 736
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Book Description
Author: Hugh A. Rand
Publisher:
ISBN:
Category : Boundary layer (Meteorology)
Languages : en
Pages : 272
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Book Description
