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The impact of ENSO on tropical and e...

Tam, Chi-Yung Francis.

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The impact of ENSO on tropical and extratropical atmospheric variability on intraseasonal and synoptic time scales as inferred from observations and GCM simulations.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The impact of ENSO on tropical and extratropical atmospheric variability on intraseasonal and synoptic time scales as inferred from observations and GCM simulations./
Author:	Tam, Chi-Yung Francis.
Description:	268 p.
Notes:	Source: Dissertation Abstracts International, Volume: 64-10, Section: B, page: 4992.
Contained By:	Dissertation Abstracts International64-10B.
Subject:	Physics, Atmospheric Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3107882
ISBN:	0496554301

The impact of ENSO on tropical and extratropical atmospheric variability on intraseasonal and synoptic time scales as inferred from observations and GCM simulations.
Tam, Chi-Yung Francis.

The impact of ENSO on tropical and extratropical atmospheric variability on intraseasonal and synoptic time scales as inferred from observations and GCM simulations. - 268 p.

Source: Dissertation Abstracts International, Volume: 64-10, Section: B, page: 4992.

Thesis (Ph.D.)--Princeton University, 2004.

The impact of El Nino and Southern Oscillation (ENSO) on different types of atmospheric transient activity is studied, based on data from an ensemble general circulation model (GCM) experiment and the National Centers for Environmental Prediction (NCEP)-National Center for Atmospheric Research (NCAR) Reanalysis Project. In particular, the Madden-Julian Oscillation (MJO), North Pacific low-frequency (subseasonal/intraseasonal) circulation anomalies and summertime tropical synoptic-scale disturbances are considered. Extensive comparisons between reanalyses results and those based on ensemble GCM integrations are carried out.

ISBN: 0496554301Subjects--Topical Terms:

1019431
Physics, Atmospheric Science.

The impact of ENSO on tropical and extratropical atmospheric variability on intraseasonal and synoptic time scales as inferred from observations and GCM simulations.
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040 $a UnM $c UnM
100 1 $a Tam, Chi-Yung Francis. $3 1932241
245 1 4 $a The impact of ENSO on tropical and extratropical atmospheric variability on intraseasonal and synoptic time scales as inferred from observations and GCM simulations.
300 $a 268 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-10, Section: B, page: 4992.
500 $a Adviser: Ngar-Cheung Lau.
502 $a Thesis (Ph.D.)--Princeton University, 2004.
520 $a The impact of El Nino and Southern Oscillation (ENSO) on different types of atmospheric transient activity is studied, based on data from an ensemble general circulation model (GCM) experiment and the National Centers for Environmental Prediction (NCEP)-National Center for Atmospheric Research (NCAR) Reanalysis Project. In particular, the Madden-Julian Oscillation (MJO), North Pacific low-frequency (subseasonal/intraseasonal) circulation anomalies and summertime tropical synoptic-scale disturbances are considered. Extensive comparisons between reanalyses results and those based on ensemble GCM integrations are carried out.
520 $a The MJO activity from the GCM and reanalyses agree in several aspects, such as their spectral characteristics, regions with large amplitudes and their phase speed. MJO convection within the central Pacific is enhanced during warm ENSO events, suppressed during cold events. Positive values of the instability index, based on the vertical gradient of the moist static energy, are found to precede MJO convection at the equator. During warm events, there are stronger signals of this index over the central Pacific, which could be important for the further eastward penetration of convective anomalies in the region.
520 $a The life cycle of low-frequency circulation anomalies over the North Pacific is studied. During cold ENSO events, eddies in general are stronger, with more prominent dispersion downstream over the west coast of U.S. GCM results show that stronger incoming wave activity from the subtropics is accompanied by stronger intraseasonal convection in the tropical western Pacific, suggesting that the MJO plays a role on how ENSO affects extratropical low-frequency activity.
520 $a The GCM is able to reproduce qualitatively the propagation and growth/decay behavior of tropical summertime synoptic-scale disturbances. During warm ENSO events, storm tracks over the western Pacific are displaced eastward. Stronger barotropic conversion from the mean to eddy kinetic energy is related to increased low-level cyclonic wind shear in the region. Finally, equatorward energy dispersion from eddies is also located more to the east in the warm phase of ENSO. The relationship between the structure of the eddies and their related dispersion pattern is examined.
590 $a School code: 0181.
650 4 $a Physics, Atmospheric Science. $3 1019431
690 $a 0608
710 2 0 $a Princeton University. $3 645579
773 0 $t Dissertation Abstracts International $g 64-10B.
790 1 0 $a Lau, Ngar-Cheung, $e advisor
790 $a 0181
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3107882