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Record 1 of 608
Relationship between Precipitating Convection and Easterly Wave Dynamics in the Western Central Pacific
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Author and Affiliation:
Bretherton, Christopher S.(Washington Univ., Dept. of Atmospheric Sciences, Seattle, WA, United States)
Abstract: The main proposed goal of this research was a synthesis of radiosonde and radar time series from the TRMM validation experiment KWAJEX (Jul. 23 - Sep. 14 1999) with satellite datasets and forecast model based analyses, in order to characterize synoptic-scale disturbances passing through the Kwajalein (9 deg N 168 deg W) region on the north edge of the central Pacific ITCZ. The Sobel et al. paper summarizes our methodology and findings. A classic paper of Reed and Recker had documented the steady pulse of easterly waves modulating meridional wind, clouds and precipitation in and west of this region in a set of observations in boreal fall. Our study found easterly waves were much less organized and intense during KWAJEX, and only weakly correlated with daily area-averaged radar-derived precipitation and IR brightness temperature. Instead, we focused on three disturbances associated with the highest daily-averaged rainfall amounts during the period. We found by looking at NCEP reanalyses that only one was an easterly wave, while the other two corresponded to an equatorial Kelvin wave and a mixed Rossby-gravity wave, respectively. The contrast with Reed and Recker may be sampling variability, but the timing of KWAJEX, earlier in the year, and during suppressed (weak La Nina) conditions may also contribute to our different conclusions.
Publication Date: Jan 01, 2004
Document ID:
20040139461
(Acquired Oct 20, 2004)
Subject Category: METEOROLOGY AND CLIMATOLOGY
Coverage: Final Report; 1 Jun. 2000 - 31 May 2003
Document Type: Technical Report
Contract/Grant/Task Num: NAG5-9657
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Organization Source: Washington Univ.; Dept. of Atmospheric Sciences; Seattle, WA, United States
Description: 3p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: MARINE METEOROLOGY; PACIFIC OCEAN; CONVECTION; RAIN; TROPICAL METEOROLOGY; RADIOSONDES; TIME SERIES ANALYSIS
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