Transport of terrestrially derived nutrients along the Western Antarctic Peninsula, Anvers Island
The mechanisms that supply Fe to the surface waters off the coast of the Western Antarctic Peninsula (WAP) play a key role in the global climate cycle by fueling primary production in this vast and globally important environment. This study investigates the shore-normal mixing rate of nearshore wate...
Main Author: | |
---|---|
Other Authors: | , |
Format: | Master Thesis |
Language: | unknown |
Published: |
East Carolina University
2015
|
Subjects: | |
Online Access: | http://hdl.handle.net/10342/4933 |
id |
fteastcaroluni:oai:TheScholarship.intra.ecu.edu:10342/4933 |
---|---|
record_format |
openpolar |
spelling |
fteastcaroluni:oai:TheScholarship.intra.ecu.edu:10342/4933 2023-05-15T13:51:01+02:00 Transport of terrestrially derived nutrients along the Western Antarctic Peninsula, Anvers Island Crenshaw, Jared Corbett, D. Reide (David Reide), 1971- Geology 2015 145 p. dissertations, academic application/pdf http://hdl.handle.net/10342/4933 unknown East Carolina University http://hdl.handle.net/10342/4933 Geochemistry Chemical oceanography Geology Antarctica Mixing Radium Radon Southern Ocean Western Antarctic Peninsula Chemical oceanography--Antarctica--Antarctic Peninsula Seawater--Antarctica--Antarctic Peninsula--Analysis Glaciers--Antarctica--Antarctic Peninsula Antarctic Peninsula (Antarctica) Anvers Island (Antarctica) Master's Thesis 2015 fteastcaroluni 2022-07-11T11:39:41Z The mechanisms that supply Fe to the surface waters off the coast of the Western Antarctic Peninsula (WAP) play a key role in the global climate cycle by fueling primary production in this vast and globally important environment. This study investigates the shore-normal mixing rate of nearshore waters using naturally-occurring radioactive isotopes. This mixing could transport nutrients derived from an unevaluated source (i.e., submarine groundwater discharge; SGD) offshore along the WAP. Stable isotopes of water (i.e., ²H, ¹�O) and radioactive groundwater tracers (i.e., ²²³,²²�,²²�,²²�Ra, ²²²Rn) were used to evaluate the potential source of these nutrients and nearshore water masses. During the austral summers of 2012-2013 and 2013-2014, seawater samples were collected along the WAP offshore of Anvers Island aboard the R/V Laurence M. Gould (LMG) to observe water-column and tracer dynamics in nearshore and offshore environments in order to evaluate the source and horizontal mixing of water across the continental shelf. Short- and long lived radium (Ra) isotopes and radon-222 (²²²Rn) are used to evaluate the rates that water masses mix in shelf waters. Porewaters collected near Palmer Station were found to be elevated in short-lived Ra isotopes and ²²²Rn, demonstrating that these tracers are valuable to delineating terrestrially derived water masses as has been reported in temperate and tropical shelf systems. Offshore surface waters were depleted in short-lived Ra isotopes and ²²²Rn relative to porewaters, and within the range of those measured in other regions of the WAP and temperate nearshore environments. Using the full suite of parameters measured, comparisons of freshwater delivery to coastal waters are compared across seasons, with increased freshwater observed during the late austral summer, 2014. Horizontal mixing rates of water masses within glacial fjords along the WAP ranged from 570 to 6820 m²s�¹. Short-lived Ra isotopes were used to estimate the timing of the most ... Master Thesis Antarc* Antarctic Antarctic Peninsula Antarctica Anvers Island Southern Ocean East Carolina University: The ScholarShip at ECU Antarctic Southern Ocean Antarctic Peninsula Austral Palmer Station ENVELOPE(-64.050,-64.050,-64.770,-64.770) Palmer-Station ENVELOPE(-64.050,-64.050,-64.770,-64.770) Anvers ENVELOPE(-63.500,-63.500,-64.600,-64.600) Anvers Island ENVELOPE(-63.500,-63.500,-64.600,-64.600) |
institution |
Open Polar |
collection |
East Carolina University: The ScholarShip at ECU |
op_collection_id |
fteastcaroluni |
language |
unknown |
topic |
Geochemistry Chemical oceanography Geology Antarctica Mixing Radium Radon Southern Ocean Western Antarctic Peninsula Chemical oceanography--Antarctica--Antarctic Peninsula Seawater--Antarctica--Antarctic Peninsula--Analysis Glaciers--Antarctica--Antarctic Peninsula Antarctic Peninsula (Antarctica) Anvers Island (Antarctica) |
spellingShingle |
Geochemistry Chemical oceanography Geology Antarctica Mixing Radium Radon Southern Ocean Western Antarctic Peninsula Chemical oceanography--Antarctica--Antarctic Peninsula Seawater--Antarctica--Antarctic Peninsula--Analysis Glaciers--Antarctica--Antarctic Peninsula Antarctic Peninsula (Antarctica) Anvers Island (Antarctica) Crenshaw, Jared Transport of terrestrially derived nutrients along the Western Antarctic Peninsula, Anvers Island |
topic_facet |
Geochemistry Chemical oceanography Geology Antarctica Mixing Radium Radon Southern Ocean Western Antarctic Peninsula Chemical oceanography--Antarctica--Antarctic Peninsula Seawater--Antarctica--Antarctic Peninsula--Analysis Glaciers--Antarctica--Antarctic Peninsula Antarctic Peninsula (Antarctica) Anvers Island (Antarctica) |
description |
The mechanisms that supply Fe to the surface waters off the coast of the Western Antarctic Peninsula (WAP) play a key role in the global climate cycle by fueling primary production in this vast and globally important environment. This study investigates the shore-normal mixing rate of nearshore waters using naturally-occurring radioactive isotopes. This mixing could transport nutrients derived from an unevaluated source (i.e., submarine groundwater discharge; SGD) offshore along the WAP. Stable isotopes of water (i.e., ²H, ¹�O) and radioactive groundwater tracers (i.e., ²²³,²²�,²²�,²²�Ra, ²²²Rn) were used to evaluate the potential source of these nutrients and nearshore water masses. During the austral summers of 2012-2013 and 2013-2014, seawater samples were collected along the WAP offshore of Anvers Island aboard the R/V Laurence M. Gould (LMG) to observe water-column and tracer dynamics in nearshore and offshore environments in order to evaluate the source and horizontal mixing of water across the continental shelf. Short- and long lived radium (Ra) isotopes and radon-222 (²²²Rn) are used to evaluate the rates that water masses mix in shelf waters. Porewaters collected near Palmer Station were found to be elevated in short-lived Ra isotopes and ²²²Rn, demonstrating that these tracers are valuable to delineating terrestrially derived water masses as has been reported in temperate and tropical shelf systems. Offshore surface waters were depleted in short-lived Ra isotopes and ²²²Rn relative to porewaters, and within the range of those measured in other regions of the WAP and temperate nearshore environments. Using the full suite of parameters measured, comparisons of freshwater delivery to coastal waters are compared across seasons, with increased freshwater observed during the late austral summer, 2014. Horizontal mixing rates of water masses within glacial fjords along the WAP ranged from 570 to 6820 m²s�¹. Short-lived Ra isotopes were used to estimate the timing of the most ... |
author2 |
Corbett, D. Reide (David Reide), 1971- Geology |
format |
Master Thesis |
author |
Crenshaw, Jared |
author_facet |
Crenshaw, Jared |
author_sort |
Crenshaw, Jared |
title |
Transport of terrestrially derived nutrients along the Western Antarctic Peninsula, Anvers Island |
title_short |
Transport of terrestrially derived nutrients along the Western Antarctic Peninsula, Anvers Island |
title_full |
Transport of terrestrially derived nutrients along the Western Antarctic Peninsula, Anvers Island |
title_fullStr |
Transport of terrestrially derived nutrients along the Western Antarctic Peninsula, Anvers Island |
title_full_unstemmed |
Transport of terrestrially derived nutrients along the Western Antarctic Peninsula, Anvers Island |
title_sort |
transport of terrestrially derived nutrients along the western antarctic peninsula, anvers island |
publisher |
East Carolina University |
publishDate |
2015 |
url |
http://hdl.handle.net/10342/4933 |
long_lat |
ENVELOPE(-64.050,-64.050,-64.770,-64.770) ENVELOPE(-64.050,-64.050,-64.770,-64.770) ENVELOPE(-63.500,-63.500,-64.600,-64.600) ENVELOPE(-63.500,-63.500,-64.600,-64.600) |
geographic |
Antarctic Southern Ocean Antarctic Peninsula Austral Palmer Station Palmer-Station Anvers Anvers Island |
geographic_facet |
Antarctic Southern Ocean Antarctic Peninsula Austral Palmer Station Palmer-Station Anvers Anvers Island |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Anvers Island Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Anvers Island Southern Ocean |
op_relation |
http://hdl.handle.net/10342/4933 |
_version_ |
1766254588855320576 |