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The observed structure of convectively coupled Kelvin waves: Comparison with simple models of coupled wave instability
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ABSTRACT
Observations of the horizontal and vertical structure of convectively coupled Kelvin waves are presented and are compared with the predicted structures of moist Kelvin (or gravity) waves in three simple models of coupled wave instability: wave-conditional instability of the second kind (CISK), wind-induced surface heat exchange (WISHE), and stratiform instability. The observations are based on a linear regression analysis of multiple years of ECMWF reanalysis and station radio...
Related newspaper, magazine, and journal articles from HighBeam Research
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Observations fo a convectively coupled Kelvin wave in the Eastern Pacific ITCZ
Journal of the Atmospheric Sciences
; ... three-dimensional reflectivity and velocity measurements every 15 min while the ship was on station in the eastern Pacific ITCZ. Maps of reflectivity at 0.5-km altitude will be analyzed in this section. To provide a broader context for these data, simultaneous ...
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Analysis of the Dominant Mode of Convectively Coupled Kelvin Waves in the West African Monsoon
Journal of Climate
; ... positive MSLP anomalies observed over 100-40W between t^sub 0^ - 9 and t^sub 0^ - 2. When looking at the time sequence of MSLP maps (not shown), it appears that these MSLP anomalies originate from South America at 20S and propagate northward along the Andes ...
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Convectively coupled equatorial waves: Analysis of clouds and temperature in the wavenumber-frequency domain
Journal of the Atmospheric Sciences
; ... bands. For comparison, the first set of maps (Figs. 7a,b) shows the variance for all ... planetary to synoptic scales. These two maps display the well-documented shift of the ... the contour interval for these first two maps is 10 times that of the following ones ...
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Extratropical forcing of convectively coupled Kelvin waves during Austral winter
Journal of the Atmospheric Sciences
; ... An interesting feature of the 1000-hPa maps, however, is the existence of Kelvin wave-li ... corresponding to the 200- and 850-hPa maps shown in Figs. 2b and 5. To the east of ... this section. In Fig. 11, monthly averaged maps of total SST (hatching), total Kelvin wave ...
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Convectively Coupled Equatorial Waves. Part II: Propagation Characteristics
Journal of the Atmospheric Sciences
; ABSTRACT Following the description of the horizontal and vertical structures of convectively coupled equatorial waves presented in Part I, here their propagation characteristics are investigated. Linear lagged regressions are used to produce their composite evolution, and the Radon transform
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The observed structure of convectively coupled Kelvin waves: Comparison with simple models of coupled wave instability
Journal of the Atmospheric Sciences
; ABSTRACT Observations of the horizontal and vertical structure of convectively coupled Kelvin waves are presented and are compared with the predicted structures of moist Kelvin (or gravity) waves in three simple models of coupled wave instability: wave-conditional instability of the second kind
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The Madden-Julian Oscillation Recorded in Early Observations from the Tropical Rainfall Measuring Mission (TRMM)
Journal of the Atmospheric Sciences
; ABSTRACT A satellite data analysis is performed to explore the Madden-Julian oscillation (MJO) focusing on the potential roles of the equatorial Rossby (ER) and Kelvin waves. Measurements from the Tropical Rainfall Measuring Mission (TRMM) Precipitation Radar (PR) and Visible/Infrared Scanner
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Convectively Coupled Equatorial Waves. Part I: Horizontal and Vertical Structures
Journal of the Atmospheric Sciences
; ABSTRACT Multilevel 15-yr ECMWF Re-Analysis (ERA-15) and satellite-observed brightness temperature (T^sub b^) data for the period May-October 1992 are used to examine the horizontal and vertical structures of convectively coupled equatorial waves. Dynamical waves are isolated using a methodology
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Convectively Coupled Equatorial Waves. Part III: Synthesis Structures and Their Forcing and Evolution
Journal of the Atmospheric Sciences
; ABSTRACT Building on Parts I and II of this study, the structures of eastward- and westward-moving convectively coupled equatorial waves are examined through synthesis of projections onto standard equatorial wave horizontal structures. The interaction between these equatorial wave components and
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A Model for Convectively Coupled Tropical Waves: Nonlinearity, Rotation, and Comparison with Observations
Journal of the Atmospheric Sciences
; ABSTRACT Recent observational analysis of both individual realizations and statistical ensembles identifies moist convectively coupled Kelvin waves in the Tropics with supercluster envelopes of convection. This observational analysis elucidates several key features of these waves including their
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