World Library  

QR link for A Model Study on the Influence of Overshooting Convection on Ttl Water Vapour : Volume 10, Issue 7 (09/07/2010)
Add to Book Shelf
Flag as Inappropriate
Email this Book

A Model Study on the Influence of Overshooting Convection on Ttl Water Vapour : Volume 10, Issue 7 (09/07/2010)

By Hassim, M. E. E.

Click here to view

Book Id: WPLBN0003995486
Format Type: PDF Article :
File Size: Pages 39
Reproduction Date: 2015

Title: A Model Study on the Influence of Overshooting Convection on Ttl Water Vapour : Volume 10, Issue 7 (09/07/2010)  
Author: Hassim, M. E. E.
Volume: Vol. 10, Issue 7
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


APA MLA Chicago

Lane, T. P., & E. Hassi, M. E. (2010). A Model Study on the Influence of Overshooting Convection on Ttl Water Vapour : Volume 10, Issue 7 (09/07/2010). Retrieved from

Description: School of Earth Sciences, The University of Melbourne, Melbourne, Victoria 3010, Australia. Overshooting deep convection that penetrates into the Tropical Tropopause Layer (TTL) is thought to have an important role in regulating the water vapour content of this region. Yet, the net effect of such convection and the dominant mechanisms remain unclear. This study uses two idealised three-dimensional cloud-resolving model simulations to examine the influence of overshooting convection on water vapour when it penetrates into two different TTL environments, one supersaturated and the other subsaturated with respect to ice. These simulations show that the overshooting convection plays a direct role in driving the ambient environment towards ice saturation through either net moistening (subsaturated TTL) or net dehydration (supersaturated TTL). Moreover, in these cases the extent of dehydration in supersaturated conditions is greater than the moistening in subsaturated conditions. With the aid of modelled passive tracers, the relative roles of transport, mixing and ice microphysics are assessed; ultimately, ice sublimation and scavenging processes play the most important role in defining the different TTL relative humidity tendencies. In addition, significant moistening in both cases is modelled well into the subsaturated tropical lower stratosphere (up to 450 K), even though the overshooting turrets only reach approximately 420 K. It is shown that this moistening is the result of jumping cirrus, which is induced by the localised upward transport and mixing of TTL air following the collapse of the overshooting turret.

A model study on the influence of overshooting convection on TTL water vapour

Alcala, C. M. and Dessler, A. E.: Observations of deep convection in the tropics using the TRMM precipitation radar, J. Geophys. Res., 107(D24), 4792, doi:10.1029/2002JD002,457, 2002.; Brock, C. A., Hudson, P. K., Lovejoy, E. R., Sullivan, A., Nowak, J. B., Huey, L. G., Cooper, O. R., Cziczo, D. J., de Gouw, J., Fehsenfeld, F. C., Holloway, J. S., H{ü}bler, G., Lafleur, B. G., Murphy, D. M., Neuman, J. A., D. K. Nicks Jr., Orsini, D. A., Parrish, D. D., Ryerson, T. B., Tanner, D. J., Warneke, C., Weber, R. J., and Wilson, J. C.: Particle characteristics following cloud-modified transport from Asia to North America, J. Geophys. Res., 109, D23S26, doi:10.1029/2003JD004198, 2004.; Brunner, D., Siegmund, P., May, P. T., Chappel, L., Schiller, C., Müller, R., Peter, T., Fueglistaler, S., MacKenzie, A. R., Fix, A., Schlager, H., Allen, G., Fjaeraa, A. M., Streibel, M., and Harris, N. R. P.: The SCOUT-O3 Darwin Aircraft Campaign: rationale and meteorology, Atmos. Chem. Phys., 9, 93–117, doi:10.5194/acp-9-93-2009, 2009.; Chaboureau, J.-P., Cammas, J.-P., Duron, J., Mascart, P. J., Sitnikov, N. M., and Voessing, H.-J.: A numerical study of tropical cross-tropopause transport by convective overshoots, Atmos. Chem. Phys., 7, 1731–1740, doi:10.5194/acp-7-1731-2007, 2007.; Chemel, C., Russo, M. R., Pyle, J. A., Sokhi, R. S., and Schiller, C.: Quantifying the imprint of a severe hector thunderstorm during ACTIVE/SCOUT-O3 onto the water content in the upper troposphere/lower stratosphere, Mon. Wea. Rev., 137, 2493–2514, doi:10.1175/2008MWR2666.1, 2009.; Corti, T., Luo, B. P., de Reus, M., Brunner, D., Cairo, F., Mahoney, M. J., Martucci, G., Matthey, R., Mitev, V., dos Santos, F. H., Schiller, C., Shur, G., Sitnikov, N. M., Spelten, N., Vössing, H. J., Borrmann, S., and Peter, T.: Unprecedented evidence for deep convection hydrating the tropical stratosphere, Geophys. Res. Lett., 35, L10810, doi:10.1029/2008GL033641, 2008.; Danielsen, E. F.: A dehydration mechanism for the stratosphere, Geophys. Res. Lett., 9, 605–608, 1982.; Danielsen, E. F.: In-situ evidence of rapid, vertical, irreversible transport of tropospheric air into the lower tropical stratosphere by convective cloud turrets and by larger-scale upwelling in tropical cyclones, J. Geophys. Res., 98, 8665–8681, 1993.; de Reus, M., Borrmann, S., Bansemer, A., Heymsfield, A. J., Weigel, R., Schiller, C., Mitev, V., Frey, W., Kunkel, D., Kürten, A., Curtius, J., Sitnikov, N. M., Ulanovsky, A., and Ravegnani, F.: Evidence for ice particles in the tropical stratosphere from in-situ measurements, Atmos. Chem. Phys., 9, 6775–6792, doi:10.5194/acp-9-6775-2009, 2009.; Dessler, A. E. and Sherwood, S. C.: Effect of convection on the summertime extratropical lower stratosphere, J. Geophys. Res., 109, D23301, doi:10.1029/2004JD005,209, 2004.; Dessler, A. E., Palm, S.&a


Click To View

Additional Books

  • Simulation of Particle Size Distribution... (by )
  • An Improved Hirs Upper Tropospheric Wate... (by )
  • Aerosol Microphysics Simulations of the ... (by )
  • Mid-winter Lower Stratosphere Temperatur... (by )
  • Reactive Uptake of Ammonia to Secondary ... (by )
  • Simulation of Ozone Production in a Comp... (by )
  • Source Apportionment of Pm10 in a North-... (by )
  • Studies of Propane Flame Soot Acting as ... (by )
  • Enhancement of N2O During the October–no... (by )
  • Intercontinental Transport of Nitrogen O... (by )
  • The Evolution of the Global Aerosol Syst... (by )
  • Mesospheric N2O Enhancements as Observed... (by )
Scroll Left
Scroll Right


Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.