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Check It Out! Examining Western Boun...

Chandler, Mitchell,

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Check It Out! Examining Western Boundary Currents Using Global Ocean Observations /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Check It Out! Examining Western Boundary Currents Using Global Ocean Observations // Mitchell Chandler.
Author:	Chandler, Mitchell,
Description:	1 electronic resource (146 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
Contained By:	Dissertations Abstracts International86-12B.
Subject:	Physical oceanography. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31940716
ISBN:	9798286439454

Check It Out! Examining Western Boundary Currents Using Global Ocean Observations /
Chandler, Mitchell,

Check It Out! Examining Western Boundary Currents Using Global Ocean Observations /Mitchell Chandler. - 1 electronic resource (146 pages)

Source: Dissertations Abstracts International, Volume: 86-12, Section: B.

The subtropical western boundary currents (WBCs) in the upper-ocean and deep western boundary currents (DWBCs) in the deep-ocean are large-scale ocean currents located on the western side of the world's major ocean basins. These currents redistribute oceanic mass and heat around the globe and exert a sizeable influence on climate variability. However, due to their complexity, both WBCs and DWBCs are difficult to observe across multiple time and space scales. This dissertation therefore sets out to explore WBC and DWBC variability, and the impacts of this variability, from seasonal to multi-decadal and from local to basin scales. To achieve this goal, a suite of complementary global ocean observing platforms is used to study the Agulhas Current in the Indian Ocean, and the East Australian Current (EAC), Kuroshio, and Southwest Pacific Basin DWBC in the Pacific Ocean. Chapter 1 examines transport trends and seasonality in the Agulhas Current, EAC, and Kuroshio. Over the 16-year time series - longer than most other time series of subsurface WBC velocity - a decreasing trend in Kuroshio transport was found. There were no significant trends in Agulhas Current or EAC transport.Chapter 2 examines the occurrence of subsurface marine heatwaves (MHWs) along a transect intersecting the Kuroshio and Kuroshio Extension. Using a novel 30-year synthetic temperature time series, subsurface MHWs were found to occur significantly more often during El Nino periods due to a strengthening of the Kuroshio Extension and its Southern Recirculation Gyre. This was a surprising result given that surface MHW occurrence along the transect is not influenced by El Nino. Lastly, Chapter 3 examines flow pathways, turbulent mixing, and seasonality in the Southwest Pacific Basin DWBC. Deep Argo observations confirmed the existence of a previously hypothesised cyclonic circulation over the Kermadec Trench. While, inside the northern Kermadec Trench, seasonal heaving within the DWBC was discovered to be driven by local Ekman pumping at the surface. Finally, the deep-ocean salinity maximum was eroded as the DWBC exited the Kermadec Trench to the north, thus revealing the Louisville Seamount Chain collision zone as a previously unidentified region of enhanced deep-ocean mixing.

English

ISBN: 9798286439454Subjects--Topical Terms:

3168433
Physical oceanography.
Subjects--Index Terms:

Western boundary currents

Check It Out! Examining Western Boundary Currents Using Global Ocean Observations /
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245 1 0 $a Check It Out! Examining Western Boundary Currents Using Global Ocean Observations / $c Mitchell Chandler.
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300 $a 1 electronic resource (146 pages)
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500 $a Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
500 $a Advisors: Zilberman, Nathalie V.; Sprintall, Janet Committee members: Talley, Lynne; Ricke, Katharine.
502 $b Ph.D. $c University of California, San Diego $d 2025.
520 $a The subtropical western boundary currents (WBCs) in the upper-ocean and deep western boundary currents (DWBCs) in the deep-ocean are large-scale ocean currents located on the western side of the world's major ocean basins. These currents redistribute oceanic mass and heat around the globe and exert a sizeable influence on climate variability. However, due to their complexity, both WBCs and DWBCs are difficult to observe across multiple time and space scales. This dissertation therefore sets out to explore WBC and DWBC variability, and the impacts of this variability, from seasonal to multi-decadal and from local to basin scales. To achieve this goal, a suite of complementary global ocean observing platforms is used to study the Agulhas Current in the Indian Ocean, and the East Australian Current (EAC), Kuroshio, and Southwest Pacific Basin DWBC in the Pacific Ocean. Chapter 1 examines transport trends and seasonality in the Agulhas Current, EAC, and Kuroshio. Over the 16-year time series - longer than most other time series of subsurface WBC velocity - a decreasing trend in Kuroshio transport was found. There were no significant trends in Agulhas Current or EAC transport.Chapter 2 examines the occurrence of subsurface marine heatwaves (MHWs) along a transect intersecting the Kuroshio and Kuroshio Extension. Using a novel 30-year synthetic temperature time series, subsurface MHWs were found to occur significantly more often during El Nino periods due to a strengthening of the Kuroshio Extension and its Southern Recirculation Gyre. This was a surprising result given that surface MHW occurrence along the transect is not influenced by El Nino. Lastly, Chapter 3 examines flow pathways, turbulent mixing, and seasonality in the Southwest Pacific Basin DWBC. Deep Argo observations confirmed the existence of a previously hypothesised cyclonic circulation over the Kermadec Trench. While, inside the northern Kermadec Trench, seasonal heaving within the DWBC was discovered to be driven by local Ekman pumping at the surface. Finally, the deep-ocean salinity maximum was eroded as the DWBC exited the Kermadec Trench to the north, thus revealing the Louisville Seamount Chain collision zone as a previously unidentified region of enhanced deep-ocean mixing.
546 $a English
590 $a School code: 0033
650 4 $a Physical oceanography. $3 3168433
650 4 $a Marine geology. $3 3173821
650 4 $a Climate change. $2 bicssc $3 2079509
653 $a Western boundary currents
653 $a Ocean basins
653 $a East Australian Current
653 $a Agulhas Current
653 $a Deep Argo trajectories
690 $a 0415
690 $a 0404
690 $a 0556
710 2 $a University of California, San Diego. $b Scripps Institution of Oceanography. $e degree granting institution. $3 3814514
720 1 $a Zilberman, Nathalie V. $e degree supervisor.
720 1 $a Sprintall, Janet $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 86-12B.
790 $a 0033
791 $a Ph.D.
792 $a 2025
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31940716