Search Results

You are looking at 1 - 6 of 6 items for :

  • Forecasting x
  • Spontaneous Imbalance x
  • All content x
Clear All
John A. Knox, Donald W. McCann, and Paul D. Williams

study and forecasting of clear-air turbulence (CAT). CAT is in-flight bumpiness detected by aircraft at high altitudes in regions devoid of significant cloudiness or nearby thunderstorms. Much of this bumpiness is assumed to be caused by aircraft flying in or near gravity waves ( Ellrod et al. 2003 ). Commercial aircraft encounter severe, or greater, turbulence about 5000 times each year, the majority of which occur above flight levels 10 000 ft above mean sea level (FL100); these incidents lead to

Full access
Dong L. Wu and Stephen D. Eckermann

-correlated at 45-km altitude in August 2006 with small-scale GW-induced temperature oscillations explicitly resolved in high-resolution global analysis fields issued by the European Centre for Medium-Range Weather Forecasts (ECMWF) Integrated Forecast System (IFS). Section 6 summarizes major results from this study and briefly discusses areas for future work. 2. The MLS Experiment on Aura The Aura MLS scans the atmospheric limb continuously. Each scan, also called a major frame (MAF), takes 24.7 s

Full access
Gregory J. Hakim

– 1953 . Ehrendorfer , M. , 1994 : The Liouville equation and its potential usefulness for the prediction of forecast skill. Part I: Theory. Mon. Wea. Rev. , 122 , 703 – 713 . Evensen , G. , 1994 : Sequential data assimilation with a nonlinear quasi-geostrophic model using Monte Carlo methods to forecast error statistics. J. Geophys. Res. , 99 , 10143 – 10162 . Golub , G. , and C. van Loan , 1996 : Matrix Computations . The Johns Hopkins University Press, 728 pp . Gombos , D

Full access
Yonghui Lin and Fuqing Zhang

-gravity waves observed in the lower stratosphere over Macquarie Island. J. Atmos. Sci. , 57 , 737 – 752 . Holton , J. R. , and M. J. Alexander , 2000 : The role of waves in the transport circulation of the middle atmosphere. Atmospheric Science across the Stratopause, Geophys. Monogr., Vol. 130, Amer. Geophys. Union, 21–35 . Hooke , W. H. , 1986 : Gravity waves. Mesoscale Meteorology and Forecasting, P. S. Ray, Ed., Amer. Meteor. Soc., 272–288 . Houghton , J. T. , 1978 : The

Full access
Michael E. McIntyre

quick review of the essentials can be found in McIntyre (2008) , and a thorough and comprehensive development of the theory, including mathematical demonstrations that it has to take the generic form it does, can be found in Mohebalhojeh and McIntyre (2007a) . Like their predecessors, going back to Hinkelmann’s forecast initialization work of the 1950s, these highly accurate inversion operators depend on computing diagnostic estimates of time derivatives ∂ n /∂ t n of the flow fields. So if a

Full access
David A. Schecter

. D. , and M. T. Montgomery , 1999 : Vortex Rossby waves and hurricane intensification in a barotropic model. J. Atmos. Sci. , 56 , 1674 – 1687 . Möller , J. D. , and M. T. Montgomery , 2000 : Tropical cyclone evolution via potential vorticity anomalies in a three-dimensional balance model. J. Atmos. Sci. , 57 , 3366 – 3387 . Möller , J. D. , and L. J. Shapiro , 2002 : Balanced contributions to the intensification of Hurricane Opal as diagnosed from a GFDL model forecast

Full access