Search Results

You are looking at 1 - 10 of 11 items for :

  • Understanding Diurnal Variability of Precipitation through Observations and Models (UDVPOM) x
  • All content x
Clear All
Donald Wylie

stratus clouds move inland showing a morning maxima opposed to the near solar noon maxima of most land cumulus clouds. This paper uses the data from High Resolution Infrared Radiation Sounder (HIRS) flown on the NOAA series of operational polar-orbiting satellites. The HIRS data were not used in the ISCCP. Jin et al. (1996) compared cloud cover statistics from the ISCCP to HIRS ( Wylie and Menzel 1999 analysis) and found that the HIRS reported 10%–15% more cloud cover from high thin cirrus clouds

Full access
Munehisa K. Yamamoto, Fumie A. Furuzawa, Atsushi Higuchi, and Kenji Nakamura

valleys. TRMM PR data reveal not only the precipitation amount as used above, but also precipitation characteristics (convective and stratiform) and the vertical structure. Takayabu (2002) used TRMM PR data to show diurnal variations in convective and stratiform precipitation over land and ocean near the equator. Over the ocean, both convective and stratiform precipitation types have a morning peak. In contrast, convective and stratiform rains over land have maxima around afternoon and midnight

Full access
Arindam Chakraborty and T. N. Krishnamurti

superensemble had the highest skill in forecasting this estimated energy exchange from the diurnal mode to the total monsoonal circulation. This study shows that a multimodel superensemble can be used to predict the diurnal mode of the Asian monsoon circulation out to five days in advance with reasonably high skill for both active and break monsoon periods. The multimodel superensemble also performs best in predicting the diurnal variation of high clouds and precipitation over both land and ocean in the

Full access
T. N. Krishnamurti, C. Gnanaseelan, A. K. Mishra, and A. Chakraborty

diurnal rainfall varies a lot over the tropical belt. An early morning rainfall maximum over oceans and a late afternoon rainfall over land area is not the norm for all regions. Large differences over short distances, such as the Tibetan Plateau and the eastern foothills of the Himalayas, are attributed to a number of factors. The reduction of sensible heating over sloping terrain in the lower troposphere and larger albedo of high clouds over the foothills, compared to what the models have been using

Full access
J. Li, S. Sorooshian, W. Higgins, X. Gao, B. Imam, and K. Hsu

circulations, such as the land–sea breeze and mountain–valley circulation, and the modulation of convection by complex terrain ( Higgins and Gochis 2007 ; Higgins et al. 2006 ). The diurnal cycle of rainfall is one of these features. In their landmark study, Negri et al. (1993 , 1994 ) first identified the diurnal cycle of rainfall along the western coast of Mexico using satellite rainfall estimates. They found that convective storms occurred offshore during the early morning hours, with several local

Full access
Alex C. Ruane and John O. Roads

model (R2; Kanamitsu et al. 2002b ) are the basis of this study. The R2 is a global spectral model utilizing a primitive equations system of virtual temperature, humidity, surface pressure, momentum prognostic equations, and various physical parameterizations (for land surface processes, precipitation, radiation, etc.). Precipitation and evaporation are put out on a 192 × 94 Gaussian grid (each pixel ∼1.9° across), but the model uses 62 spherical harmonics with a triangular truncation and 28 σ

Full access
R. Cifelli, S. W. Nesbitt, S. A. Rutledge, W. A. Petersen, and S. Yuter

; and many others). A number of forcing mechanisms have been proposed to account for the diurnal cycle (see Yang and Smith 2006 for a recent literature review). The majority of observational studies, using data ranging from rain gauge and ship reports to radar and satellite data, have shown that precipitation diurnal variations are pronounced over land during the warm season, with a maximum in precipitation occurring in the late afternoon–early evening occurring in most (but not all) areas

Full access
Tianjun Zhou, Rucong Yu, Haoming Chen, Aiguo Dai, and Yang Pan

1. Introduction Large-scale analyses of precipitation have traditionally focused on accumulated amounts or time-averaged mean rates, while other characteristics of precipitation, such as frequency and intensity, have been the foci of only recent studies (e.g., Dai 2001a , b ; Trenberth et al. 2003 ; Dai et al. 2007 ; DeMott et al. 2007 ; Sun et al. 2006 , 2007 ). Together with the diurnal cycle, which is large for rainfall over land during the warm season (e.g., Dai 2001b ; Dai et al

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

new types of research concerning diurnal variability. This has been particularly true for precipitation since the advent of the Tropical Rainfall Measuring Mission (TRMM) and its associated TRMM Microwave Imager (TMI) radiometer and Precipitation Radar (PR) rain-rate retrievals dating back to November 1997. Many mechanisms have been proposed to explain diurnal precipitation behavior (see Table 1 for definitions of acronyms used in explaining dynamically, thermodynamically, and radiatively forced

Full access
Song Yang and Eric A. Smith

global precipitation characteristics through analysis of the seasonal variability of convective and stratiform rainfall based on the use of long-term records of TRMM rainfall (8 yr over the 1998–2005 period) obtained from PR and TMI measurements—over the tropical global province. Overall, the principal scientific objectives of this study are 1) to understand the climatological variability of convective and stratiform precipitation on a seasonal basis, classified by continental and oceanic

Full access