Search Results
to only use the synoptic- and smaller-scale part of the wind field for the semigeostrophic coordinate transformation. The rationale for this approach is that the quasi-stationary planetary waves can be considered as part of the background flow, which should not be included into the coordinate transformation. More specifically we use u g ([ s 1 , s 2 ]) and υ g ([ s 1 , s 2 ]) instead of u g and υ g in the semigeostrophic coordinate transformation in (9) and (10) , where the notation
to only use the synoptic- and smaller-scale part of the wind field for the semigeostrophic coordinate transformation. The rationale for this approach is that the quasi-stationary planetary waves can be considered as part of the background flow, which should not be included into the coordinate transformation. More specifically we use u g ([ s 1 , s 2 ]) and υ g ([ s 1 , s 2 ]) instead of u g and υ g in the semigeostrophic coordinate transformation in (9) and (10) , where the notation
( Tripathi et al. 2015 ). Matsuno (1971) developed a dynamical model of the stratospheric sudden warming phenomena in which tropospheric forced planetary wave packets propagate upward into the stratosphere. The deposition of their easterly angular momentum [Eliassen–Palm flux (EP flux) convergence] leads to a weakening and breakdown of the polar night jet. Several processes influence the occurrence of MSSW events in the Northern Hemisphere: the quasi-biennial oscillation (QBO) and the solar cycle (e
( Tripathi et al. 2015 ). Matsuno (1971) developed a dynamical model of the stratospheric sudden warming phenomena in which tropospheric forced planetary wave packets propagate upward into the stratosphere. The deposition of their easterly angular momentum [Eliassen–Palm flux (EP flux) convergence] leads to a weakening and breakdown of the polar night jet. Several processes influence the occurrence of MSSW events in the Northern Hemisphere: the quasi-biennial oscillation (QBO) and the solar cycle (e
-level waveguides . J. Atmos. Sci. , 67 , 866 – 879 . Matsuno , T. , 1966 : Quasi-geostrophic motions in the equatorial area . J. Meteor. Soc. Japan , 44 , 25 – 42 . McIntyre , M. E. , and T. N. Palmer , 1983 : Breaking planetary waves in the stratosphere . Nature , 305 , 593 – 600 . Pauluis , O. , A. Czaja , and B. Korty , 2008 : The global atmospheric circulation on moist isentropes . Science , 321 , 1075 – 1078 . Ploeger , F. , and Coauthors , 2011 : Insight from ozone and
-level waveguides . J. Atmos. Sci. , 67 , 866 – 879 . Matsuno , T. , 1966 : Quasi-geostrophic motions in the equatorial area . J. Meteor. Soc. Japan , 44 , 25 – 42 . McIntyre , M. E. , and T. N. Palmer , 1983 : Breaking planetary waves in the stratosphere . Nature , 305 , 593 – 600 . Pauluis , O. , A. Czaja , and B. Korty , 2008 : The global atmospheric circulation on moist isentropes . Science , 321 , 1075 – 1078 . Ploeger , F. , and Coauthors , 2011 : Insight from ozone and
1. Introduction The summer of 2010 in Eurasia was characterized by anomalously high temperatures due to a blocking high centered over western Russia and, simultaneously, a large-scale shift of the Asian summer monsoon region associated with high precipitation and floods in Pakistan ( Blunden et al. 2011 ). The structure of the precipitation and the anomalously flow pattern of the Pakistan flood of 2010 is analyzed in more detail in Houze et al. (2011) . Both extreme phenomena, the heat wave
1. Introduction The summer of 2010 in Eurasia was characterized by anomalously high temperatures due to a blocking high centered over western Russia and, simultaneously, a large-scale shift of the Asian summer monsoon region associated with high precipitation and floods in Pakistan ( Blunden et al. 2011 ). The structure of the precipitation and the anomalously flow pattern of the Pakistan flood of 2010 is analyzed in more detail in Houze et al. (2011) . Both extreme phenomena, the heat wave
partitioning based on flow geometry . J. Atmos. Sci. , 71 , 4204 – 4220 , doi: 10.1175/JAS-D-14-0023.1 . Rodwell , M. J. , and Coauthors , 2013 : Characteristics of occasional poor medium-range weather forecasts for Europe . Bull. Amer. Meteor. Soc. , 94 , 1393 – 1405 , doi: 10.1175/BAMS-D-12-00099.1 . Rossby , C.-G. , 1940 : Planetary flow patterns in the atmosphere . Quart. J. Roy. Meteor. Soc. , 66 , 68 – 87 . Schwierz , C. , S. Dirren , and H. C. Davies , 2004 : Forced waves on
partitioning based on flow geometry . J. Atmos. Sci. , 71 , 4204 – 4220 , doi: 10.1175/JAS-D-14-0023.1 . Rodwell , M. J. , and Coauthors , 2013 : Characteristics of occasional poor medium-range weather forecasts for Europe . Bull. Amer. Meteor. Soc. , 94 , 1393 – 1405 , doi: 10.1175/BAMS-D-12-00099.1 . Rossby , C.-G. , 1940 : Planetary flow patterns in the atmosphere . Quart. J. Roy. Meteor. Soc. , 66 , 68 – 87 . Schwierz , C. , S. Dirren , and H. C. Davies , 2004 : Forced waves on
-level precursor . Geophys. Res. Lett. , 25 , 1435 – 1438 , doi: 10.1029/98GL50869 . Massacand , A. C. , H. Wernli , and H. C. Davies , 2001 : Influence of upstream diabatic heating upon an Alpine event of heavy precipitation . Mon. Wea. Rev. , 129 , 2822 – 2828 , doi: 10.1175/1520-0493(2001)129<2822:IOUDHU>2.0.CO;2 . McIntyre , M. E. , and T. Palmer , 1983 : Breaking planetary waves in the stratosphere . Nature , 305 , 593 – 600 , doi: 10.1038/305593a0 . MeteoSwiss , 2013
-level precursor . Geophys. Res. Lett. , 25 , 1435 – 1438 , doi: 10.1029/98GL50869 . Massacand , A. C. , H. Wernli , and H. C. Davies , 2001 : Influence of upstream diabatic heating upon an Alpine event of heavy precipitation . Mon. Wea. Rev. , 129 , 2822 – 2828 , doi: 10.1175/1520-0493(2001)129<2822:IOUDHU>2.0.CO;2 . McIntyre , M. E. , and T. Palmer , 1983 : Breaking planetary waves in the stratosphere . Nature , 305 , 593 – 600 , doi: 10.1038/305593a0 . MeteoSwiss , 2013
1. Introduction Meteorological research on diabatic Rossby waves (DRWs) has been intensifying in recent years after a DRW was detected for the first time in numerical weather prediction (NWP) model output for a high-impact weather event. According to a mesoscale model hindcast simulation, a DRW served as an important precursor to the “Lothar” storm after Christmas 1999, which was one of the most harmful winter storms over Europe in the last few decades ( Wernli et al. 2002 ). The explosive
1. Introduction Meteorological research on diabatic Rossby waves (DRWs) has been intensifying in recent years after a DRW was detected for the first time in numerical weather prediction (NWP) model output for a high-impact weather event. According to a mesoscale model hindcast simulation, a DRW served as an important precursor to the “Lothar” storm after Christmas 1999, which was one of the most harmful winter storms over Europe in the last few decades ( Wernli et al. 2002 ). The explosive
) and http://www.cosmo-model.org for more details on the computational methods]. The model is set up with a horizontal resolution of 0.025° (about 2.5 km at 35°N) and 57 vertical levels up to 30-km height, with an enhanced vertical resolution in the planetary boundary layer. Shallow convection is parameterized using the mass-flux scheme of Tiedtke (1989) , while middle and high convection are explicitly computed. For all parameterized processes, the default setup of COSMO is used ( Doms et al
) and http://www.cosmo-model.org for more details on the computational methods]. The model is set up with a horizontal resolution of 0.025° (about 2.5 km at 35°N) and 57 vertical levels up to 30-km height, with an enhanced vertical resolution in the planetary boundary layer. Shallow convection is parameterized using the mass-flux scheme of Tiedtke (1989) , while middle and high convection are explicitly computed. For all parameterized processes, the default setup of COSMO is used ( Doms et al
