Search Results

You are looking at 1 - 6 of 6 items for :

  • Waves, atmospheric x
  • Understanding Diurnal Variability of Precipitation through Observations and Models (UDVPOM) x
  • All content x
Clear All
R. Cifelli, S. W. Nesbitt, S. A. Rutledge, W. A. Petersen, and S. Yuter

determining the local phase of the diurnal cycle resulting from either the propagation of convective systems or external nonconvective forcing such as gravity waves. Over the open ocean, studies regarding the diurnal cycle of precipitation are often hampered by the paucity of observations ( Dai 2001 ). This is particularly true in the east Pacific ITCZ region, where atmospheric–oceanic processes are poorly represented in numerical models ( Mechoso et al. 1995 ; Raymond et al. 2003 ) and large

Full access
Alex C. Ruane and John O. Roads

1. Introduction Nearly all atmospheric activity is originally derived from external solar forcing. On time scales of a year and less, this forcing arrives in the form of a strong daily signal resulting from the rotation of the earth and a seasonal signal due to the earth’s orbit and inclination. The diurnal and annual cycles of solar insolation are therefore fundamental to the earth’s water cycle, but do not necessarily drive an equivalent response. Energy from these solar forcings interacts

Full access
R. E. Carbone and J. D. Tuttle

acts as an elevated heat source. They showed that convection scaled upward from simple cumulonimbus over the mountains to meso- β - and meso- α -scale systems over the plains, propagating eastward for hours. Gravity wave modes constrained by background slope flow circulations were shown to be central to the underlying dynamics. More recently, various global and regional studies (e.g., Davis et al. 2003 ; Wang et al. 2004 , 2005 ; Ahijevych et al. 2004 ; Tuttle and Davis 2006 ; Parker and

Full access
Song Yang, Kwo-Sen Kuo, and Eric A. Smith

1. Introduction Studies of atmospheric diurnal processes that are influenced by the regulated daily cycle of incoming solar radiation at the top of the atmosphere (TOA) have been taking place for over 100 yr. The seminal study of Hann (1901) was the first to address precipitation’s diurnal cycle. Observational and modeling analyses have demonstrated that diurnal processes are evident in many atmospheric quantities. These include precipitation (e.g., Hong et al. 2005 ; Yang and Smith 2006

Full access
Song Yang and Eric A. Smith

sources. The large amplitude of the rainfall over the tropical easten Pacific Ocean and across the northwest South American coastal zone is also associated with storm-generated convection. The local maxima of rainfall over the tropical eastern Atlantic Ocean and over Africa are likely due to convection produced within tropical easterly waves. Also, there is an obvious intensification of the ITCZ rainfall during summer relative to the ITCZ intensity during spring. The autumn rainfall distribution

Full access
Arindam Chakraborty and T. N. Krishnamurti

validation of cloud diurnal cycle results. Section 4 mentions the experiments performed. The unified cloud parameterization scheme is described in section 5 . Section 6 illustrates the results in detail. The main findings of this study are summarized in section 7 . 2. Model used The FSU GSM was used in this study to construct ensemble forecasts with four different cloud schemes. The horizontal resolution of the model had a triangular truncation at 126 waves (T126), which corresponds to roughly 0

Full access