國立虎尾科技大學 |

A Phase Plane Based Perspective of Energetics of Large Scale Tropical Convection.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	A Phase Plane Based Perspective of Energetics of Large Scale Tropical Convection./
Author:	Maithel, Vijit.
Description:	1 online resource (150 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-02, Section: B.
Contained By:	Dissertations Abstracts International85-02B.
Subject:	Atmospheric sciences. -
Online resource:	click for full text (PQDT)
ISBN:	9798380156462

A Phase Plane Based Perspective of Energetics of Large Scale Tropical Convection.
Maithel, Vijit.

A Phase Plane Based Perspective of Energetics of Large Scale Tropical Convection. - 1 online resource (150 pages)

Source: Dissertations Abstracts International, Volume: 85-02, Section: B.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2023.

Includes bibliographical references

Moisture plays a key role in governing rainfall and convective variability across multiple spatiotemporal scales in the tropics. However, climate models fail to represent such variability realistically. This calls for a need for more process-oriented diagnostics that can help identify the different characteristics and patterns of moisture-driven convective variability. This dissertation contributes towards that task by proposing novel physics motivated diagnostics and establishing the scope of their use by applying these to different observational and reanalysis datasets. The proposed diagnostics provide a phase plane-based approach to understanding the evolution of moisture and moist static energy in the tropics. The results highlight the cyclic nature of the variability. Moisture and rainfall are found to increase and decrease together periodically. More interestingly, we find that a mean composite cycle has similar characteristics and time periods across different regions in the tropics despite differences in the observed dominant wave modes. They are also found to be driven primarily by the advection of moisture by the convective circulation in all the different regions. This indicates that such cycles are fundamental to how convection evolves in the tropics.We further show that the phase plane-based framework can also be applied to study characteristics of individual events as well as other known wave modes and not just the mean composite behavior. By modifying our phase plane analysis to look at the evolution of moist static energy variance, we show that such cyclic evolution can also be interpreted as a signal of convective aggregation. Overall, this study highlights the importance of simple physics-based metrics in simplifying some of the complex interactions between convection, large-scale circulation, and moisture. The phase plane-based framework presented in this work provides a convenient way to visualize important characteristics of convective evolution and is easy to implement for different types of gridded data. This motivates further study of climate model output using these simpler metrics to identify model errors and biases.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798380156462Subjects--Topical Terms:

1179392
Atmospheric sciences.
Subjects--Index Terms:

Convective aggregationIndex Terms--Genre/Form:

554714
Electronic books.

A Phase Plane Based Perspective of Energetics of Large Scale Tropical Convection.
LDR:03551ntm a22003857 4500 001 1150288
005 20241028114737.5
006 m o d
007 cr bn ---uuuuu
008 250605s2023 xx obm 000 0 eng d
020 $a 9798380156462
035 $a (MiAaPQ)AAI30638235
035 $a AAI30638235
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Maithel, Vijit. $3 1476747
245 1 2 $a A Phase Plane Based Perspective of Energetics of Large Scale Tropical Convection.
264 0 $c 2023
300 $a 1 online resource (150 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 85-02, Section: B.
500 $a Advisor: Back, Larissa.
502 $a Thesis (Ph.D.)--The University of Wisconsin - Madison, 2023.
504 $a Includes bibliographical references
520 $a Moisture plays a key role in governing rainfall and convective variability across multiple spatiotemporal scales in the tropics. However, climate models fail to represent such variability realistically. This calls for a need for more process-oriented diagnostics that can help identify the different characteristics and patterns of moisture-driven convective variability. This dissertation contributes towards that task by proposing novel physics motivated diagnostics and establishing the scope of their use by applying these to different observational and reanalysis datasets. The proposed diagnostics provide a phase plane-based approach to understanding the evolution of moisture and moist static energy in the tropics. The results highlight the cyclic nature of the variability. Moisture and rainfall are found to increase and decrease together periodically. More interestingly, we find that a mean composite cycle has similar characteristics and time periods across different regions in the tropics despite differences in the observed dominant wave modes. They are also found to be driven primarily by the advection of moisture by the convective circulation in all the different regions. This indicates that such cycles are fundamental to how convection evolves in the tropics.We further show that the phase plane-based framework can also be applied to study characteristics of individual events as well as other known wave modes and not just the mean composite behavior. By modifying our phase plane analysis to look at the evolution of moist static energy variance, we show that such cyclic evolution can also be interpreted as a signal of convective aggregation. Overall, this study highlights the importance of simple physics-based metrics in simplifying some of the complex interactions between convection, large-scale circulation, and moisture. The phase plane-based framework presented in this work provides a convenient way to visualize important characteristics of convective evolution and is easy to implement for different types of gridded data. This motivates further study of climate model output using these simpler metrics to identify model errors and biases.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
538 $a Mode of access: World Wide Web
650 4 $a Atmospheric sciences. $3 1179392
650 4 $a Ocean engineering. $3 857658
650 4 $a Climate change. $2 bicssc $3 1009004
653 $a Convective aggregation
653 $a Large-scale convection
653 $a Moisture modes
653 $a Tropical dynamics
655 7 $a Electronic books. $2 local $3 554714
690 $a 0725
690 $a 0404
690 $a 0547
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a The University of Wisconsin - Madison. $b Atmospheric & Oceanic Sciences. $3 1190705
773 0 $t Dissertations Abstracts International $g 85-02B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30638235 $z click for full text (PQDT)