Search Results

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

  • Planetary atmospheres x
  • Diabatic Influence on Mesoscale Structures in Extratropical Storms (DIAMET) x
  • User-accessible content x
Clear All
Oscar Martínez-Alvarado, Suzanne L. Gray, and John Methven

bin, and the contributions from individual diabatic processes to these changes, as a function of time in each cyclone. e. Integral interpretation of PV tracers: Circulation Ertel PV is defined as (e.g., Haynes and McIntyre 1987 ) where ρ is density; is the three-dimensional absolute velocity, with being a position vector from Earth’s center and being the planetary angular velocity; and is the gradient operator in geographic coordinates. The absolute circulation on an isentropic surface

Full access
Jeffrey M. Chagnon and Suzanne L. Gray

), diabatic Rossby waves (e.g., Parker and Thorpe 1995 ; Moore and Montgomery 2004 ; Moore et al. 2013 ), and forecast error growth (e.g., Brennan et al. 2008 ; Davies and Didone 2013 ). In the absence of frictional and diabatic processes, PV is materially conserved. Therefore, PV provides a convenient means to characterize the large-scale structure of the atmosphere and its evolution in mid- and high latitudes where the planetary vorticity is nonnegligible. Climatologically, PV increases with height

Full access
Sam Hardy, David M. Schultz, and Geraint Vaughan

: Planetary flow patterns in the atmosphere . Quart. J. Roy. Meteor. Soc. , 66 , 68 – 87 . Sanders , F. , 1986 : Explosive cyclogenesis in the west-central North Atlantic Ocean, 1981–84. Part I: Composite structure and mean behavior . Mon. Wea. Rev. , 114 , 1781 – 1794 , doi: 10.1175/1520-0493(1986)114<1781:ECITWC>2.0.CO;2 . 10.1175/1520-0493(1986)114<1781:ECITWC>2.0.CO;2 Skamarock , W. C. , and Coauthors , 2008 : A description of the Advanced Research WRF version 3. NCAR Tech. Note NCAR

Full access
David M. Schultz and Joseph M. Sienkiewicz

are better defined at this level and other sting-jet studies have shown that models have difficulty mixing momentum into the planetary boundary layer (e.g., Parton et al. 2009 ; Smart and Browning 2013 ). In this case, the 10-m model winds are about 10–15 m s −1 weaker than the 925-hPa winds, and the QuikSCAT winds in Fig. 1 are closer to the 925-hPa model winds at the time of the overpass (not shown). At 1200 UTC 7 December ( Figs. 2a,b ), 925-hPa winds exceeded 35 m s −1 in the warm sector

Full access
Geraint Vaughan, Bogdan Antonescu, David M. Schultz, and Christopher Dearden

Illingworth 2011 ). The vertical structure of the atmosphere was monitored using the U.K. Mesosphere–Stratosphere–Troposphere (MST) radar ( Vaughan 2002 ), a VHF wind-profiling radar operating at a frequency of 46.5 MHz and located at Capel Dewi (52.42°N, 4.01°W) near Aberystwyth in mid-Wales (see Fig. 9 for the location of Capel Dewi). MST radar data can be used to identify tropopause folds based on measurements of echo power [due to quasi-specular reflection from gradients in static stability and

Full access
Matthew R. Clark and Douglas J. Parker

with a mid-Atlantic States cold frontal rainband . Natl. Wea. Dig. , 24 , 37 – 51 . Grumm , R. H. , and M. Glazewski , 2004 : Thunderstorm types associated with the “broken-S” radar signature. 22nd Conf. on Severe Local Storms, Hyannis, MA, Amer. Meteor. Soc., P7.1. [Available online at .] Haurwitz , B. , 1949 : The instability of wind discontinuities and shear zones in planetary atmospheres . J. Meteor. , 6 , 200

Full access