The Upper Layer Structure and Variability of an Antarctic Glacio-marine Fjord: Andvord Bay, Western Antarctic Peninsula
Glacio-marine fjords on the Western Antarctic Peninsula (WAP) are relatively unstudied, rapidly changing systems of high biological productivity. The goal of this research is to characterize the upper layer physical structure and variability of a representative fjord, Andvord Bay, to determine how i...
Main Author: | |
---|---|
Other Authors: | , |
Format: | Text |
Language: | unknown |
Published: |
University of Hawaii at Manoa
2017
|
Subjects: | |
Online Access: | http://hdl.handle.net/10125/56546 |
id |
ftunivhawaiimano:oai:scholarspace.manoa.hawaii.edu:10125/56546 |
---|---|
record_format |
openpolar |
spelling |
ftunivhawaiimano:oai:scholarspace.manoa.hawaii.edu:10125/56546 2023-05-15T13:35:42+02:00 The Upper Layer Structure and Variability of an Antarctic Glacio-marine Fjord: Andvord Bay, Western Antarctic Peninsula Christensen, Katy Merrifield, Mark Global Environmental Science 2017-05 39 pages application/pdf http://hdl.handle.net/10125/56546 unknown University of Hawaii at Manoa http://hdl.handle.net/10125/56546 All UHM Honors Projects are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner. Fjord Western Antarctic Peninsula Upper Layer Physical Oceanography Text 2017 ftunivhawaiimano 2022-07-17T13:27:24Z Glacio-marine fjords on the Western Antarctic Peninsula (WAP) are relatively unstudied, rapidly changing systems of high biological productivity. The goal of this research is to characterize the upper layer physical structure and variability of a representative fjord, Andvord Bay, to determine how it changes in time and space in response to external forcing on seasonal and shorter time scales. To analyze the upper layer of Andvord Bay, CTD (Conductivity/Temperature/Depth) profiles and shipboard thermosalinograph data are used from two cruises in the National Science Foundation (NSF) supported project, Fjord ECO. First, the mixed layer depth (MLD) is determined using two different methods: higher order weighting and vertical differences of density above threshold with different commonly used threshold values. The variability of the upper layer salinity, temperature, density, and MLD are analyzed in relation to changes in space, time, and wind forcing. The threshold method using a threshold value of ∆σ = 0.03 kg/m3 is used to define the MLD, with inaccuracies in detection primarily due to the presence of weakly stratified layers at the surface. In the variability analysis, results show that seasonal heat flux is the largest factor impacting the changes in the upper layer of WAP fjords, although wind forcing does play an occasional role. Geographic influences are less prominent and are only relevant between the inside and outside of the fjord. Understanding the upper layer is an important part of understanding the water column dynamics, the chemical characteristics, and the biological diversity of glacio-marine fjords along the WAP. Ocean, Earth Science, and Technology Text Antarc* Antarctic Antarctic Peninsula ScholarSpace at University of Hawaii at Manoa Andvord ENVELOPE(-62.616,-62.616,-64.833,-64.833) Andvord Bay ENVELOPE(-62.650,-62.650,-64.833,-64.833) Antarctic Antarctic Peninsula |
institution |
Open Polar |
collection |
ScholarSpace at University of Hawaii at Manoa |
op_collection_id |
ftunivhawaiimano |
language |
unknown |
topic |
Fjord Western Antarctic Peninsula Upper Layer Physical Oceanography |
spellingShingle |
Fjord Western Antarctic Peninsula Upper Layer Physical Oceanography Christensen, Katy The Upper Layer Structure and Variability of an Antarctic Glacio-marine Fjord: Andvord Bay, Western Antarctic Peninsula |
topic_facet |
Fjord Western Antarctic Peninsula Upper Layer Physical Oceanography |
description |
Glacio-marine fjords on the Western Antarctic Peninsula (WAP) are relatively unstudied, rapidly changing systems of high biological productivity. The goal of this research is to characterize the upper layer physical structure and variability of a representative fjord, Andvord Bay, to determine how it changes in time and space in response to external forcing on seasonal and shorter time scales. To analyze the upper layer of Andvord Bay, CTD (Conductivity/Temperature/Depth) profiles and shipboard thermosalinograph data are used from two cruises in the National Science Foundation (NSF) supported project, Fjord ECO. First, the mixed layer depth (MLD) is determined using two different methods: higher order weighting and vertical differences of density above threshold with different commonly used threshold values. The variability of the upper layer salinity, temperature, density, and MLD are analyzed in relation to changes in space, time, and wind forcing. The threshold method using a threshold value of ∆σ = 0.03 kg/m3 is used to define the MLD, with inaccuracies in detection primarily due to the presence of weakly stratified layers at the surface. In the variability analysis, results show that seasonal heat flux is the largest factor impacting the changes in the upper layer of WAP fjords, although wind forcing does play an occasional role. Geographic influences are less prominent and are only relevant between the inside and outside of the fjord. Understanding the upper layer is an important part of understanding the water column dynamics, the chemical characteristics, and the biological diversity of glacio-marine fjords along the WAP. Ocean, Earth Science, and Technology |
author2 |
Merrifield, Mark Global Environmental Science |
format |
Text |
author |
Christensen, Katy |
author_facet |
Christensen, Katy |
author_sort |
Christensen, Katy |
title |
The Upper Layer Structure and Variability of an Antarctic Glacio-marine Fjord: Andvord Bay, Western Antarctic Peninsula |
title_short |
The Upper Layer Structure and Variability of an Antarctic Glacio-marine Fjord: Andvord Bay, Western Antarctic Peninsula |
title_full |
The Upper Layer Structure and Variability of an Antarctic Glacio-marine Fjord: Andvord Bay, Western Antarctic Peninsula |
title_fullStr |
The Upper Layer Structure and Variability of an Antarctic Glacio-marine Fjord: Andvord Bay, Western Antarctic Peninsula |
title_full_unstemmed |
The Upper Layer Structure and Variability of an Antarctic Glacio-marine Fjord: Andvord Bay, Western Antarctic Peninsula |
title_sort |
upper layer structure and variability of an antarctic glacio-marine fjord: andvord bay, western antarctic peninsula |
publisher |
University of Hawaii at Manoa |
publishDate |
2017 |
url |
http://hdl.handle.net/10125/56546 |
long_lat |
ENVELOPE(-62.616,-62.616,-64.833,-64.833) ENVELOPE(-62.650,-62.650,-64.833,-64.833) |
geographic |
Andvord Andvord Bay Antarctic Antarctic Peninsula |
geographic_facet |
Andvord Andvord Bay Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_relation |
http://hdl.handle.net/10125/56546 |
op_rights |
All UHM Honors Projects are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner. |
_version_ |
1766069134036041728 |