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Energetic Theory and Hadley Cells at a Seasonal Scale : = How Will ITCZ Respond to a Warming Climate.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Energetic Theory and Hadley Cells at a Seasonal Scale :/
Reminder of title:	How Will ITCZ Respond to a Warming Climate.
Author:	Bai, Xiaoyu.
Description:	1 online resource (159 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 83-11, Section: B.
Contained By:	Dissertations Abstracts International83-11B.
Subject:	Atmospheric sciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29163865click for full text (PQDT)
ISBN:	9798426825864

Energetic Theory and Hadley Cells at a Seasonal Scale : = How Will ITCZ Respond to a Warming Climate.
Bai, Xiaoyu.

Energetic Theory and Hadley Cells at a Seasonal Scale :How Will ITCZ Respond to a Warming Climate. - 1 online resource (159 pages)

Source: Dissertations Abstracts International, Volume: 83-11, Section: B.

Thesis (Ph.D.)--The University of North Carolina at Charlotte, 2022.

Includes bibliographical references

The Intertropical Convergence Zone (ITCZ), a belt of convective systems around the equator with showers and thunderstorms, is an important feature not only to the tropical societies whose water budget depends on it, but also to the atmospheric science field to understand how will the Earth respond to a warming climate. Previous studies found that annual and zonal mean ITCZ position is related to interhemispheric atmospheric heat transport (AHTtotal). The radiative imbalance at the top of the atmosphere (TOA) transported across the equator to the cooler hemisphere explains the ITCZ position and its shift. Using idealized model simulations with a "slab" ocean, researchers found that an increase in the interhemispheric TOA radiation contrast causes an increase in cross-equatorial energy flux by the Hadley circulation and a shift of the ITCZ towards the warmer hemisphere. The theory that relates AHTtotal and ITCZ position is called energetic theory.In this dissertation, we analyze Tropical rain belts with an Annual cycle and a Continent-Model Intercomparison Project (TRACMIP) model simulations to test the energetic theory. TRACMIP is a project of idealized models that fill the gap between idealized aquaplanet models and fully-coupled models. TRACMIP models are thermodynamically coupled to a slab ocean. TRACMIP has idealized tropical continent setups with both present-day and quadruple CO2 (4 x CO2) concentration experiments, which can help us understand ITCZ shift and potential precipitation changes over land under a warming scenario. Our findings suggested that TRACMIP simulations do not support energetic theory's expectations under a warming climate.All of our models simulated a northward shift of ITCZ and mass transport under a warming scenario. Our models disagreed on the changes of the energy transported by Hadley cells and the total energy transported by the atmosphere. In general, the link between mass transport changes and energy transported by the Hadley cells changes broke down the most during Northern Hemisphere tropical wet season. The link between changes of the energy transported by the Hadley cells and total energy transported by the atmosphere broke down the most during Northern Hemisphere tropical dry season. Breakdown of one or both of these links caused the overall link between ITCZ shifts and total energy transport changes to break down.We encourage more studies to be done on energetic theory and climate change. We look forward to combining energetic theory with monsoon theories to develop a self-contained tropical climate model.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798426825864Subjects--Topical Terms:

3168354
Atmospheric sciences.
Subjects--Index Terms:

Climate changeIndex Terms--Genre/Form:

542853
Electronic books.

Energetic Theory and Hadley Cells at a Seasonal Scale : = How Will ITCZ Respond to a Warming Climate.
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502 $a Thesis (Ph.D.)--The University of North Carolina at Charlotte, 2022.
504 $a Includes bibliographical references
520 $a The Intertropical Convergence Zone (ITCZ), a belt of convective systems around the equator with showers and thunderstorms, is an important feature not only to the tropical societies whose water budget depends on it, but also to the atmospheric science field to understand how will the Earth respond to a warming climate. Previous studies found that annual and zonal mean ITCZ position is related to interhemispheric atmospheric heat transport (AHTtotal). The radiative imbalance at the top of the atmosphere (TOA) transported across the equator to the cooler hemisphere explains the ITCZ position and its shift. Using idealized model simulations with a "slab" ocean, researchers found that an increase in the interhemispheric TOA radiation contrast causes an increase in cross-equatorial energy flux by the Hadley circulation and a shift of the ITCZ towards the warmer hemisphere. The theory that relates AHTtotal and ITCZ position is called energetic theory.In this dissertation, we analyze Tropical rain belts with an Annual cycle and a Continent-Model Intercomparison Project (TRACMIP) model simulations to test the energetic theory. TRACMIP is a project of idealized models that fill the gap between idealized aquaplanet models and fully-coupled models. TRACMIP models are thermodynamically coupled to a slab ocean. TRACMIP has idealized tropical continent setups with both present-day and quadruple CO2 (4 x CO2) concentration experiments, which can help us understand ITCZ shift and potential precipitation changes over land under a warming scenario. Our findings suggested that TRACMIP simulations do not support energetic theory's expectations under a warming climate.All of our models simulated a northward shift of ITCZ and mass transport under a warming scenario. Our models disagreed on the changes of the energy transported by Hadley cells and the total energy transported by the atmosphere. In general, the link between mass transport changes and energy transported by the Hadley cells changes broke down the most during Northern Hemisphere tropical wet season. The link between changes of the energy transported by the Hadley cells and total energy transported by the atmosphere broke down the most during Northern Hemisphere tropical dry season. Breakdown of one or both of these links caused the overall link between ITCZ shifts and total energy transport changes to break down.We encourage more studies to be done on energetic theory and climate change. We look forward to combining energetic theory with monsoon theories to develop a self-contained tropical climate model.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Atmospheric sciences. $3 3168354
653 $a Climate change
653 $a Energetic theory
653 $a ITCZ shift
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710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a The University of North Carolina at Charlotte. $b Infrastructure & Environmental Systems. $3 3180175
773 0 $t Dissertations Abstracts International $g 83-11B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29163865 $z click for full text (PQDT)