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Using a Wrf Simulation to Examine Regions Where Convection Impacts the Asian Summer Monsoon Anticyclone : Volume 13, Issue 9 (24/09/2013)

By Heath, N. K.

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Book Id: WPLBN0003996386
Format Type: PDF Article :
File Size: Pages 45
Reproduction Date: 2015

Title: Using a Wrf Simulation to Examine Regions Where Convection Impacts the Asian Summer Monsoon Anticyclone : Volume 13, Issue 9 (24/09/2013)  
Author: Heath, N. K.
Volume: Vol. 13, Issue 9
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


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Fuelberg, H. E., & Heath, N. K. (2013). Using a Wrf Simulation to Examine Regions Where Convection Impacts the Asian Summer Monsoon Anticyclone : Volume 13, Issue 9 (24/09/2013). Retrieved from

Description: Department of Earth, Ocean and Atmospheric Science Florida State University, Tallahassee, FL 32306-4520, USA. The Asian summer monsoon is a prominent feature of the global circulation that is associated with an upper-level anticyclone (ULAC) that stands out vividly in satellite observations of trace gases. The ULAC also is an important region of troposphere-to-stratosphere transport. We ran the Weather Research and Forecasting (WRF) model at convective-permitting scales (4 km grid spacing) between 10–20 August 2012 to understand the role of convection in transporting boundary layer air into the upper-level anticyclone. Such high-resolution modeling of the Asian ULAC previously has not been documented in the literature. Comparison of our WRF simulation with reanalysis and satellite observations showed that WRF simulated the atmosphere sufficiently well to be used to study convective transport into the ULAC. A back-trajectory analysis based on hourly WRF output showed that > 90% of convectively influenced parcels reaching the ULAC came from the Tibetan Plateau (TP) and the southern slope (SS) of the Himalayas. A distinct diurnal cycle is seen in the convective trajectories, with their greatest impact occurring between 1600–2300 local solar time. This finding highlights the role of everyday diurnal convection in transporting boundary layer air into the ULAC.

WRF output at 15 min intervals was produced for 16 August to examine the convection in greater detail. This high-temporal output revealed that the weakest convection in the study area occurred over the TP. However, because the TP is at 3000–5000 m a.m.s.l., its convection does not have to be as strong to reach the ULAC as in lower altitude regions. In addition, because the TP's elevated heat source is a major cause of the ULAC, we propose that convection over the TP and the neighboring SS is ideally situated geographically to impact the ULAC.

The vertical mass flux of water vapor into the ULAC also was calculated. Results show that the TP and SS regions dominate other Asian regions in transporting moisture vertically into the ULAC. Because convection reaching the ULAC is more widespread over the TP than nearby, we propose that the abundant convection partially explains the TP's dominant water vapor fluxes. In addition, greater outgoing longwave radiation reaches the upper levels of the TP due to its elevated terrain. This creates a warmer ambient upper level environment, allowing parcels with greater saturation mixing ratios to enter the ULAC. Lakes in the Tibetan Plateau are shown to provide favorable conditions for deep convection during the night.

Using a WRF simulation to examine regions where convection impacts the Asian summer monsoon anticyclone

Ávila, E. E., Bürgesser, R. E., Castellano, N. E., Collier, A. B., Compangnucci, R. H., and Hughes, A. R. W.: Correlations between deep convection and lightning activity on a global scale, J. Atmos. Sol.-Terr. Phys., 72, 1114–1121, 2010.; Barros, A. P., Kim, G., Williams, E., and Nesbitt, S. W.: Probing orographic controls in the Himalayas during the monsoon using satellite imagery, Nat. Hazards Earth Syst. Sci., 4, 29–51, doi:10.5194/nhess-4-29-2004, 2004.; Bergman, J. W., Jensen, E. J., Pfister, L., and Yang, Q.: Seasonal differences of vertical transport efficiency in the tropical tropopause layer: On the interplay between deep convection, large-scale vertical ascent, and horizontal circulations, J. Geophys. Res., 114, D05302, doi:10.1029/2011JD016992, 2012.; Bonazzola, M. and Haynes, P. H.: A trajectory-based study of the tropical tropopause region, J. Geophys. Res., 109, D20112, doi:10.1029/2003JD004356, 2004.; Carrico, C. M., Bergin, M. H., Shrestha, A. B., Dibb, J. E., Gomes, L., and Harris, J. M.: The importance of carbon and mineral dust to seasonal aerosol properties in the Nepal Himalaya, Atmos. Environ., 37, 2811–2824, 2003.; Chen, B., Xu, X. D., Yang, S., and Zhao, T. L.: Climatological perspectives of air transport from atmospheric boundary layer to tropopause layer over Asian monsoon regions during boreal summer inferred from Lagrangian approach, Atmos. Chem. Phys., 12, 5827–5839, doi:10.5194/acp-12-5827-2012, 2012.; Chen, P.: Isentropic cross-tropopause mass exchange in the extratropics, J. Geophys. Res., 100, 16661–16673, 1995.; Chou, M., Suarez, M. J., Liang, X., and Yan, M. M. H.: A thermal infrared radiation parameterization for atmospheric studies, NASA Technical Report Series on Global Modeling and Data Assimilation NASA/TM-2001-104606, 68 pp, 2001.; Corti, T., Luo, B. P., Fu, Q., Vomel, H., and Peter, T.: The impact of cirrus clouds on tropical troposphere-to-stratosphere transport, Atmos. Chem. Phys., 6, 2539–2547, doi:10.5194/acp-6-2539-2006, 2006.; Corti, T., Luo, B. P., and Peter, T.: Mean radiative energy balance and vertical mass fluxes in the equatorial upper troposphere and lower stratosphere, Geophys. Res. Lett., 32, L06802, doi:10.1029/2004GL021889, 2005.; Deierling, W. and Peterson, W. A.: Total lightning activity as an indicator of updraft characteristics, J. Geophys. Res., 113, D16210, doi:10.1029/2007JD009598, 2008.; Draxler, R. R.: Boundary layer isentropic and kinematic trajectories during the August 1993 North Atlantic Regional Experiment Intensive, J. Geophys. Res., 101, 29255–29268, 1996.; Draxler, R. R. and Hess, G. D.: An overview of the HYSPLIT_4 modeling system of trajectories, dispersion, and deposition, Aust. Meteor. Mag., 47, 295–308, 1998.; Draxler, R. R. and Hess, G. D.: Description of the hysplit4 modeling system, NOAA Tech. Rep. ERL ARL-224, 27 pp., [NTIS PB-297398.], 2010.; Done, J., C. and Weisman, M.: The next generation of NWP: Explicit forecasts of convection using the Weather Research and Forecasting (WRF) model, Atmos. Sci. Lett., 5, 110–117, 2004.; Dowden, R. L., Brundell, J. B., and Rodger, C. J.: VLF lightning location by time of group arrival (TOGA) at multiple sites, J. Atmos. Sol-Terr Phys., 64, 817–830, 2002.; Duan, A. M. and Wu, G. X.: Role of the Tibetan Plateau thermal forcing in the summer climate patterns over subtropical Asia, Clim. Dynam., 24, 793–807, 2005.; Dunkerton, T. J.: Evidence of meridional motion in the summer lower stratosphere adjacent to monsoon regions, J. Geophys. Res., 100, 16675–16688, 1995.; E


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