Search Results

You are looking at 51 - 60 of 478 items for :

  • Planetary atmospheres x
  • Weather and Forecasting x
  • All content x
Clear All
Greema Regmi, Sajan Shrestha, Sangeeta Maharjan, Anil Kumar Khadka, Ram Prasad Regmi, and Gopi Chandra Kaphle

longwave radiation, the Dudhia scheme ( Dudhia 1989 ) for shortwave radiation, the MYJ scheme ( Janjić 2001 ) for the planetary boundary layer, and the Noah land surface model ( Chen and Dudhia 2001 ). Table 2 summarizes the details of the model configuration and initialization. Table 2. WRF Model setup and configuration used in the study. b. Sensitivity test setup and initialization A deterministic numerical weather forecast tends to have large uncertainty due to errors associated with the global

Restricted access
Scott M. Rochette and James T. Moore

- mental Satellite ( GOES) MB-enhanced infrared ( IR) imagery obtained from the Forecast Systems Labora- tory ( FSL) . In addition, WSR-88D equivalent reflec- tivity imagery was gathered from the National Weather Service Forecast Office in Weldon Spring, Missouri. Various stability parameter fields will also be exam- ined. The authors will show that the thunderstorms of 6 June 1993 were not rooted in the planetary boundary layer, as is usually the case with warm season convec- tion ( Colman 1990a

Full access
Steven C. Albers

and adjacent ocean environs arecalculated for the National Meteorological Center's Nested Grid Model (NGM). The eight winters 1985/861992/93 are examined. Errors are compared for the time-mean flow and for four recurring planetary-scale flowregimes, and the statistical significance of the differences is estimated. Overall, the NGM produces very accurate 500-mb height forecasts out to 48 h, with every forecast cycle ofthe study period exhibiting useful deterministic skill at 48 h when averaged

Full access
W. F. Feltz, K. M. Bedka, J. A. Otkin, T. Greenwald, and S. A. Ackerman

.S. Geological Society (USGS) topography dataset. The simulation contained 65 vertical levels with the model top set to 10 hPa. The vertical resolution decreased from <100 m in the lowest 1 km to ∼440 m from 7 km to the model top. Subgridscale processes were parameterized using the Thompson et al. (2008) mixed-phase cloud microphysics scheme, the Mellor–Yamada–Janjić planetary boundary layer scheme ( Mellor and Yamada 1982 ), and the Dudhia (1989) shortwave and Rapid Radiative Transfer Model (RRTM

Full access
Richard J. Reed and Adrian J. Simmons

describe the planetary boundarylayer and at higher levels in regions of static instability.The other parameterizations used are discussed in papers by Miller et al. (1989), Ritter (1984), and Tiedtkeet al. (1988).2. Results The final panel (d) in Fig. 1 shows the predictedsurface pressure at 1200 UTC 13 January when theforecast was rerun with the surface fluxes omitted. Itis evident that the fluxes had virtually no effect on the24-h prediction of cyclone depth and position. Withoutfluxes, the system

Full access
Edward A. O’Lenic, David A. Unger, Michael S. Halpert, and Kenneth S. Pelman

-air height was subsequently shown to be associated with stationary teleconnection patterns, which are maintained by energy from the basic state derived from barotropic instability ( Simmons et al. 1983 ; Blackmon et al. 1984a , b ). Ocean–atmosphere ( Rasmusson and Carpenter 1982 ) and land–atmosphere interactions ( Huang and Van den Dool 1996 ; Van den Dool 2007 ; Van den Dool et al. 2003 ) were also found to produce predictable anomaly patterns. Phenomena that fall into this category include ENSO

Full access
Guiting Song, Robert Huva, Yu Xing, and Xiaohui Zhong

of the underlying processes in the atmosphere. For a location that is not persistently cloudy it is, for instance, currently beyond the scope of purely statistical or regression-based model to generate cloudy conditions a day in advance—without huge amounts of information regarding the general stability of the atmosphere and any upstream influences. NWP models, which capture the full state of the atmosphere, can simulate such conditions and their role in forecasting day-ahead solar irradiance is

Restricted access
Justin R. Minder, W. Massey Bartolini, Christopher Spence, Newell R. Hedstrom, Peter D. Blanken, and John D. Lenters

( Reeves and Dawson 2013 ; McMillen and Steenburgh 2015b ; Saslo and Greybush 2017 ) and near-surface turbulent fluxes ( Conrick et al. 2015 ; Saslo and Greybush 2017 ; Fujisaki-Manome et al. 2017 ). Here we focus on uncertainties in simulations of LeS storms associated with turbulent fluxes in the surface layer (SL) and planetary boundary layer (PBL). Conrick et al. (2015) investigated the sensitivity to SL and PBL parameterization schemes in the Weather Research and Forecasting (WRF) Model for

Free access
Prakash Pithani, Sachin D. Ghude, R. K. Jenamani, Mrinal Biswas, C. V. Naidu, Sreyashi Debnath, Rachana Kulkarni, Narendra G. Dhangar, Chinmay Jena, Anupam Hazra, R. Phani, P. Mukhopadhyay, Thara Prabhakaran, Ravi S. Nanjundiah, and M. Rajeevan

) for detailed representations of the thermodynamical and surface processes within the planetary boundary layer (PBL). Multiple sensitivity experiments were carried out using a combination of different parameterization schemes (PBL, microphysics, land surface schemes), and model configuration (domain size and horizontal and vertical grid resolution) to determine the optimum configuration for predicting the dense fog events in India ( Pithani et al. 2019a , b ). Based on these earlier sensitivity

Free access
Dorita Rostkier-Edelstein and Joshua P. Hacker

) crops: An agrotechnology model based study. Global Planet. Change , 54 , 163 – 182 . 10.1016/j.gloplacha.2005.11.003 Mlawer, E. J. , Toubman S. J. , Brown P. D. , Iacono M. J. , and Clough S. A. , 1997 : Radiative transfer for inhomogeneous atmospheres: RRTM, a validated correlated-k model for the longwave. J. Geophys. Res. , 102D , 16663 – 16682 . Noh, Y. , Cheon W. G. , Hong S. Y. , and Raasch S. , 2003 : Improvement of the k -profile model for the planetary boundary

Full access