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Elucidating the Sources Supplying Aerosol Iron, Zinc, and Cadmium to the Surface of the North Pacific Ocean with Stable Isotopes.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Elucidating the Sources Supplying Aerosol Iron, Zinc, and Cadmium to the Surface of the North Pacific Ocean with Stable Isotopes./
Author:	Bunnell, Zach B.
Description:	1 online resource (140 pages)
Notes:	Source: Masters Abstracts International, Volume: 84-02.
Contained By:	Masters Abstracts International84-02.
Subject:	Chemical oceanography. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29258905click for full text (PQDT)
ISBN:	9798841511816

Elucidating the Sources Supplying Aerosol Iron, Zinc, and Cadmium to the Surface of the North Pacific Ocean with Stable Isotopes.
Bunnell, Zach B.

Elucidating the Sources Supplying Aerosol Iron, Zinc, and Cadmium to the Surface of the North Pacific Ocean with Stable Isotopes. - 1 online resource (140 pages)

Source: Masters Abstracts International, Volume: 84-02.

Thesis (M.S.)--University of South Florida, 2022.

Includes bibliographical references

Transition metals, such as iron (Fe), zinc (Zn) and cadmium (Cd), are found at just trace amounts within the global oceans yet are vital for many biological functions of phytoplankton. As a result, these metals influence the ocean's efficacy for carbon sequestration. Atmospheric dust is the primary input of Fe to various surface waters and may also supply Zn and Cd to oligotrophic surface waters. Here, I present Fe, Zn, and Cd isotope data from the US North Pacific GEOTRACES Section GP15 (Alaska-Tahiti) from the low-dust season (Sept. - Nov. 2018). Using this data and aerosol enrichment factors, I show that aerosol Fe, Zn, and Cd are sourced primarily from Asian dust for northern deployments (52 to 32°N), while for southern deployments (20°N to 20°S) they are sourced from a mixture of Asian dust and natural, wildfire, and anthropogenic aerosols from North America. An important finding of this study is that both GP15 data and Fe deposition modelling from the CAM6-QFED model confirms an isotopically heavy aerosol Fe source to the North Pacific (which spans the full range of particle sizes), which I attribute to soil being entrained during wildfires and possibly Fe sourced from shipping. Soluble aerosol Fe is light (-1.28 to +0.02‰) in both Northern and Southern deployments, strongly indicative of anthropogenic combustion Fe. A two-component isotope mixing model calculates that 0.5-7% of bulk aerosol and 12-81% of soluble aerosol Fe in the North are anthropogenic, but the model breaks down in the South because at least three sources contribute to Southern deployments. For Zn and Cd, the whole GP15 section is dominated by non-crustal sources, reflected by light isotopic compositions (bulk Zn: -0.29 to +0.01‰; soluble Zn: -0.35 to +0.09‰; soluble Cd: -1.91 to -0.07‰) and enrichment factors (Zn: 32-693; Cd: 263-10775). Northern deployments indicate the presence of a large proportion of highly soluble, anthropogenic Zn, while southern deployments are lighter and more enriched in Zn, attributed to wildfires. In contrast, Cd exhibited no latitudinal trends, indicating a consistent source of anthropogenic Cd throughout the year. Although there is potential evidence of Fe and Cd aerosol influence on surface waters, the influence of Zn aerosols is not seen. Overall, this work highlights the utility of transition metal isotope tracers as powerful emerging tools for teasing apart distinct sources contributing to atmospheric aerosols, as well as the need to include additional sources such as wildfire and shipping with distinct isotopic signatures into models.

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

Mode of access: World Wide Web

ISBN: 9798841511816Subjects--Topical Terms:

516760
Chemical oceanography.
Subjects--Index Terms:

AerosolsIndex Terms--Genre/Form:

542853
Electronic books.

Elucidating the Sources Supplying Aerosol Iron, Zinc, and Cadmium to the Surface of the North Pacific Ocean with Stable Isotopes.
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245 1 0 $a Elucidating the Sources Supplying Aerosol Iron, Zinc, and Cadmium to the Surface of the North Pacific Ocean with Stable Isotopes.
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500 $a Source: Masters Abstracts International, Volume: 84-02.
500 $a Advisor: Conway, Tim M.
502 $a Thesis (M.S.)--University of South Florida, 2022.
504 $a Includes bibliographical references
520 $a Transition metals, such as iron (Fe), zinc (Zn) and cadmium (Cd), are found at just trace amounts within the global oceans yet are vital for many biological functions of phytoplankton. As a result, these metals influence the ocean's efficacy for carbon sequestration. Atmospheric dust is the primary input of Fe to various surface waters and may also supply Zn and Cd to oligotrophic surface waters. Here, I present Fe, Zn, and Cd isotope data from the US North Pacific GEOTRACES Section GP15 (Alaska-Tahiti) from the low-dust season (Sept. - Nov. 2018). Using this data and aerosol enrichment factors, I show that aerosol Fe, Zn, and Cd are sourced primarily from Asian dust for northern deployments (52 to 32°N), while for southern deployments (20°N to 20°S) they are sourced from a mixture of Asian dust and natural, wildfire, and anthropogenic aerosols from North America. An important finding of this study is that both GP15 data and Fe deposition modelling from the CAM6-QFED model confirms an isotopically heavy aerosol Fe source to the North Pacific (which spans the full range of particle sizes), which I attribute to soil being entrained during wildfires and possibly Fe sourced from shipping. Soluble aerosol Fe is light (-1.28 to +0.02‰) in both Northern and Southern deployments, strongly indicative of anthropogenic combustion Fe. A two-component isotope mixing model calculates that 0.5-7% of bulk aerosol and 12-81% of soluble aerosol Fe in the North are anthropogenic, but the model breaks down in the South because at least three sources contribute to Southern deployments. For Zn and Cd, the whole GP15 section is dominated by non-crustal sources, reflected by light isotopic compositions (bulk Zn: -0.29 to +0.01‰; soluble Zn: -0.35 to +0.09‰; soluble Cd: -1.91 to -0.07‰) and enrichment factors (Zn: 32-693; Cd: 263-10775). Northern deployments indicate the presence of a large proportion of highly soluble, anthropogenic Zn, while southern deployments are lighter and more enriched in Zn, attributed to wildfires. In contrast, Cd exhibited no latitudinal trends, indicating a consistent source of anthropogenic Cd throughout the year. Although there is potential evidence of Fe and Cd aerosol influence on surface waters, the influence of Zn aerosols is not seen. Overall, this work highlights the utility of transition metal isotope tracers as powerful emerging tools for teasing apart distinct sources contributing to atmospheric aerosols, as well as the need to include additional sources such as wildfire and shipping with distinct isotopic signatures into models.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Chemical oceanography. $3 516760
653 $a Aerosols
653 $a Dust
653 $a North pacific
653 $a Stable isotopes
653 $a Trace metals
655 7 $a Electronic books. $2 lcsh $3 542853
690 $a 0403
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a University of South Florida. $b Marine Science. $3 1683799
773 0 $t Masters Abstracts International $g 84-02.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29258905 $z click for full text (PQDT)