Search Results

You are looking at 101 - 110 of 7,107 items for :

  • Diabatic heating x
  • All content x
Clear All
Dean D. Churchill and Robert A. Houze Jr.

I APRILI991 DEAN D. CHURCHILL AND ROBERT A. HOUZE JR. 903Effects of Radiation and Turbulence on the Diabatic Heating and Water Budget of the $tratiform Region of a Tropical Cloud Cluster DEAN D. CHURCHILL* AND ROBERT A. HOUZE, JR.Department of Atmospheric Sciences, University of Washington, Seattle, Washington(Manuscript received 31 July 1989, in final form 19 October 1990

Full access
Sarah M. Borg, Steven M. Cavallo, and David D. Turner

these severe events. Many previous studies have shown that TPVs are heavily influenced by radiation ( Cavallo and Hakim 2009 , 2010 , 2012 , 2013 ), with a variety of case studies and simulation-based composites used to determine this. Cavallo and Hakim (2009) set the stage for a composite study of TPVs by using a case study to show that radiation and latent heating were the prime diabatic factors in TPV evolution. A follow-up study using model output from 568 TPV cases led to the currently

Restricted access
Zhenhai Zhang and Brian A. Colle

diabatic potential vorticity (DPV) as in Marciano et al. (2015) . Similar with the cyclone intensity distribution in Fig. 3 , the composite cyclone in WRF-HR is 1.6–1.8 hPa deeper than WRF-LR ( Fig. 8 ). The central SLP of the composite cyclone for the ECL region is 1000.1 hPa (999.8 hPa) in C-WRF-LR (G-WRF-LR) and 998.3 hPa (998.2 hPa) in C-WRF-HR (G-WRF-HR). The DPV is 10%–15% stronger in WRF-HR than the DPV in WRF-LR over the comma head of the cyclone, which is consistent with the difference of

Full access
Wataru Yanase and Ayako Abe-Ouchi

high pressure system (e.g., Hoskins 1996 ; Miyasaka and Nakamura 2005 ). Since the ice albedo over North America caused the NPCA in our experiments, the NPCA dynamics seems to be explained by the westward response of the atmosphere to the diabatic forcing over the continent including the surface sensible heat flux and condensational heating. Figures 7 and 8 show the zonal distribution of surface sensible heat flux and precipitation, respectively, at the midlatitudes in boreal summer. Here

Full access
Gerard Kilroy, Roger K. Smith, and Michael T. Montgomery

the evolution of the vortex. There is a thermodynamic control also that we explore in the next subsection. b. Role of boundary layer thermodynamics and convective forcing The boundary layer is important not only in determining the location of the eyewall and the radial profiles of vertical velocity and tangential momentum entering the eyewall: it plays an important role in determining also the radial distribution of diabatic heating within the eyewall. The reason is that the wind field in the

Full access
Dominique Bouniol, Rémy Roca, Thomas Fiolleau, and D. Emmanuel Poan

, Schumacher et al. (2004) show that an improved representation of the vertical shape and geographical distribution of the diabatic heating profile leads to a more realistic upper-level circulation. Because of their horizontal scale, convective processes remain parameterized within general circulation models. Some of these parameterizations, in particular that of Donner et al. (2001) , include a degree of mesoscale organization by including a representation of the internal circulation. However, in spite

Full access
Hanin Binder, Maxi Boettcher, Hanna Joos, and Heini Wernli

1. Introduction Many studies have shown that moist diabatic processes play an important role for the evolution of extratropical cyclones [see, e.g., the review by Uccellini (1990) ]. Particularly, several case studies have revealed a significant contribution of latent heating to the intensification of explosively deepening cyclones (e.g., Reed et al. 1992 ; Wernli et al. 2002 ; Ludwig et al. 2014 ). Theoretical studies confirmed the importance of latent heating for cyclone development

Full access
Robert Fajber and Paul J. Kushner

Abstract

In the circulating atmosphere, diabatic heating influences the potential temperature content of air masses far from where the heating occurs. Budgets that balance local diabatic sources with local heat divergence and storage do not retain information about this remote influence, which requires air-mass tracking. In this study, a process based, passive-tracer diagnostic, called heat tagging, is introduced. Heat tagging locally decomposes the potential temperature into contributions from the distinctive diabatic processes that generate them, wherever they occur. The distribution, variability and transport of atmospheric heat tags are studied in the relatively simple setting of an idealized aquaplanet model. Heat tags from latent heating are generated in the deep tropics and the midlatitude storm track and then transported throughout the troposphere. By contrast dry sensible heat tags are enhanced near the surface, and radiative tags are mainly confined to the stratosphere. As a result, local heat transport, variability of potential temperature and global poleward heat transport are dominated by heat tags related to latent heating, with heat tags from sensible and radiative heating only making contributions in the polar near surface and the stratosphere respectively. Heat tagging thus quantifies how water vapor and latent heating link the structural characteristics of the atmosphere and illustrates the importance of the hydrological cycle in poleward energy transport.

Restricted access
Yan Liu, Zhe-Min Tan, and Zhaohua Wu

diabatic heating. This extra heating helped to amplify the growth rate of planetary-scale waves. In a rather similar way, Brenowitz et al. (2016) considered the contribution of large-scale averaged moisture convergence to convective heating, and thus, large-scale waves were preferred. The conclusion may be drawn from the above discussion that moisture convergence in a broader region should be included to remedy the CISK catastrophe, but the reason to do so is not readily apparent. In the next

Open access
Jie Zhang, Haishan Chen, and Siwen Zhao

the Tibetan Plateau is conducive to driving tropical moisture northward, which affects the position of the ISM over the IS. Summer rainfall over the southwestern Tibetan Plateau is also controlled by deep convection over the IS ( Feng and Zhou 2012 ; Dong et al. 2016 ). In addition, the Tibetan Plateau heating also modulates circulation and water vapor transport over NC ( Zhang et al. 2018 ). The question of whether the Tibetan Plateau rainfall and diabatic heating impact the rainfall

Open access