Search Results

You are looking at 1 - 7 of 7 items for :

  • Fifth International Symposium on Tropospheric Profiling (ISTP) x
  • All content x
Clear All
P. C. S. Devara, P. E. Raj, K. K. Dani, G. Pandithurai, M. C. R. Kalapureddy, S. M. Sonbawne, Y. J. Rao, and S. K. Saha

area of aerosol–cloud interactions (i.e., the indirect effects of aerosol radiative forcing), such as studies of the influence of aerosols in the subcloud layer (including those in the boundary layer) on the time evolution of cloud structures aloft, are planned in future work. In an attempt to investigate the time evolution of the nighttime boundary layer and residual layer (a layer formed in the postsunset time because of the settling of aerosol particles, which are lifted into the atmosphere due

Full access
Thierry Leblanc, I. Stuart McDermid, and Robin A. Aspey

summarize our findings and describe our ensuing 2007 plans for instrument improvements. 2. Instrument description Because of the very low mixing ratio of water vapor near the tropopause and in the lower stratosphere, Raman lidar measurements in this region are noise limited. To try to maximize the signal-to-noise ratio we use very high laser pulse energies of up to 900 mJ per pulse at 355 nm and a repetition rate of 10 Hz (Continuum Powerlite II Nd:YAG); a large 91-cm-aperture telescope with narrow

Full access
Danny E. Scipión, Phillip B. Chilson, Evgeni Fedorovich, and Robert D. Palmer

not taken into account when the cross-correlation phase is calculated (calibration effect). The layer thickness estimates are usually wider than the true layer. Better estimates of the layer thickness are expected once RIM has been implemented on the radar simulator, which is planned as a future refinement. 5. Conclusions Based on the work of MSW99 , a refined LES-based radar simulator suitable for studies of the convective boundary layer has been presented. The simulator is capable of producing

Full access
Ulrich Löhnert, S. Crewell, O. Krasnov, E. O’Connor, and H. Russchenberg

” structures seen in Fig. 6f occurring mainly in 1–3-km height must still be examined more closely in the future. We assume them to originate from a combination of radiometric noise and horizontal inhomogeneities. However, to check the possibility of real temporal variations in the vertical temperature profile, we plan to assess Raman lidar and/or tethered balloon measurements during future campaigns [e.g., the Convective and Orographically-induced Precipitation Study (COPS) 2007, http

Full access
Steven E. Koch, Cyrille Flamant, James W. Wilson, Bruce M. Gentry, and Brian D. Jamison

trade-off between needing the highest possible resolution and keeping the noise level acceptably low. The National Center for Atmospheric Research (NCAR) S-band (2.8-GHz transmitter frequency) dual-polarization Doppler radar (S-Pol; Lutz et al. 1995 ), with 0.91° beamwidth, was located 15 km to the west of Homestead (EAST in Fig. 1 ). The S-Pol provided radar reflectivity and radial velocity fields every 5 min for this study. Both plan position indicator (PPI) and range–height indicator (RHI

Full access
Matthias Grzeschik, Hans-Stefan Bauer, Volker Wulfmeyer, Dirk Engelbart, Ulla Wandinger, Ina Mattis, Dietrich Althausen, Ronny Engelmann, Matthias Tesche, and Andrea Riede

system to horizontal heterogeneities in soil moisture initialization. J. Hydrometeor. , 5 , 934 – 958 . 10.1175/1525-7541(2004)005<0934:SOACSO>2.0.CO;2 Crook, N. A. , 1996 : Sensitivity of moist convection forced by boundary layer processes to low-level thermodynamic fields. Mon. Wea. Rev. , 124 , 1767 – 1785 . 10.1175/1520-0493(1996)124<1767:SOMCFB>2.0.CO;2 Deutscher Wetterdienst , 2000 : Satellite application facility on climate monitoring: Science plan. Deutscher Wetterdienst Tech

Full access
Edwin F. Campos, Wayne Hocking, and Frédéric Fabry

. , 59–60 , 343 – 359 . Fig . 1. Flowchart describing the process by which we simulate profiles of an equivalent reflectivity factor at the VHF band. It uses Eq. (2) in combination with a height-variable reflectivity at the X band and with a VHF antenna pattern of nonnegligible sidelobes. Fig . 2. Plan for the antenna array of the McGill VHF radar. Note that the aerials are aligned at 48.7° from the north. Fig . 3. Two-way antenna pattern (also known as a polar diagram, F 2 ) for the McGill VHF

Full access