Application of SeaWinds Scatterometer Data to the Study of Antarctic Icebergs
Knowledge of iceberg location and size is important for safety reasons as well as for understanding many geophysical and biological processes. This dissertation analyzes large tabular icebergs in the Southern Ocean using the SeaWinds scatterometer. SeaWinds is a spaceborne radar designed to measure...
Main Author: | |
---|---|
Format: | Text |
Language: | unknown |
Published: |
BYU ScholarsArchive
2012
|
Subjects: | |
Online Access: | https://scholarsarchive.byu.edu/etd/3371 https://scholarsarchive.byu.edu/context/etd/article/4370/viewcontent/ETD_CISOPTR_3425.pdf |
id |
ftbrighamyoung:oai:scholarsarchive.byu.edu:etd-4370 |
---|---|
record_format |
openpolar |
spelling |
ftbrighamyoung:oai:scholarsarchive.byu.edu:etd-4370 2023-07-23T04:15:52+02:00 Application of SeaWinds Scatterometer Data to the Study of Antarctic Icebergs Stuart, Keith Mitchell 2012-09-21T07:00:00Z application/pdf https://scholarsarchive.byu.edu/etd/3371 https://scholarsarchive.byu.edu/context/etd/article/4370/viewcontent/ETD_CISOPTR_3425.pdf unknown BYU ScholarsArchive https://scholarsarchive.byu.edu/etd/3371 https://scholarsarchive.byu.edu/context/etd/article/4370/viewcontent/ETD_CISOPTR_3425.pdf http://lib.byu.edu/about/copyright/ Theses and Dissertations SeaWinds scatterometer iceberg Southern Ocean Electrical and Computer Engineering text 2012 ftbrighamyoung 2023-07-03T22:18:44Z Knowledge of iceberg location and size is important for safety reasons as well as for understanding many geophysical and biological processes. This dissertation analyzes large tabular icebergs in the Southern Ocean using the SeaWinds scatterometer. SeaWinds is a spaceborne radar designed to measure the microwave backscatter from the Earth's surface. Using resolution-enhancement techniques, backscatter measurements are processed into backscatter images in which icebergs can be observed. An iceberg detection methodology is formalized using daily scatterometer images. Radar profiles from common Antarctic scatterers are quantified and an iceberg detection methodology is formalized using daily scatterometer images. Iceberg positions are determined in real-time and a time-series of iceberg positions is maintained in an Antarctic iceberg database. Using the Antarctic iceberg database, characteristic iceberg motion trends are identified. Iceberg detection and tracking is demonstrated through real-time operational support of the 2005, 2008, and 2009 National Science Foundation Antarctic cruises. To supplement iceberg position reports, I develop multiple algorithms to estimate iceberg size and rotational orientation from backscatter images and from raw backscatter measurements. Estimates derived from SeaWinds images are found to be more accurate. Using iceberg size parameters in conjunction with Newton's equations of motion and forcing profiles (e.g., ocean and air currents), I also develop an iceberg motion model to predict the translational and rotational motion of large tabular icebergs. To improve model results, a Kalman filter is used to incorporate actual iceberg measurements into the motion model, and statistics from the Kalman filter are used to evaluate model performance. Simulated iceberg motion is found to best coincide with observed iceberg motion in regions where slower iceberg drift speeds are observed. The model is less accurate at high speeds. The iceberg motion model is inverted to produce estimates of ... Text Antarc* Antarctic Iceberg* Southern Ocean Brigham Young University (BYU): ScholarsArchive Antarctic Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
Brigham Young University (BYU): ScholarsArchive |
op_collection_id |
ftbrighamyoung |
language |
unknown |
topic |
SeaWinds scatterometer iceberg Southern Ocean Electrical and Computer Engineering |
spellingShingle |
SeaWinds scatterometer iceberg Southern Ocean Electrical and Computer Engineering Stuart, Keith Mitchell Application of SeaWinds Scatterometer Data to the Study of Antarctic Icebergs |
topic_facet |
SeaWinds scatterometer iceberg Southern Ocean Electrical and Computer Engineering |
description |
Knowledge of iceberg location and size is important for safety reasons as well as for understanding many geophysical and biological processes. This dissertation analyzes large tabular icebergs in the Southern Ocean using the SeaWinds scatterometer. SeaWinds is a spaceborne radar designed to measure the microwave backscatter from the Earth's surface. Using resolution-enhancement techniques, backscatter measurements are processed into backscatter images in which icebergs can be observed. An iceberg detection methodology is formalized using daily scatterometer images. Radar profiles from common Antarctic scatterers are quantified and an iceberg detection methodology is formalized using daily scatterometer images. Iceberg positions are determined in real-time and a time-series of iceberg positions is maintained in an Antarctic iceberg database. Using the Antarctic iceberg database, characteristic iceberg motion trends are identified. Iceberg detection and tracking is demonstrated through real-time operational support of the 2005, 2008, and 2009 National Science Foundation Antarctic cruises. To supplement iceberg position reports, I develop multiple algorithms to estimate iceberg size and rotational orientation from backscatter images and from raw backscatter measurements. Estimates derived from SeaWinds images are found to be more accurate. Using iceberg size parameters in conjunction with Newton's equations of motion and forcing profiles (e.g., ocean and air currents), I also develop an iceberg motion model to predict the translational and rotational motion of large tabular icebergs. To improve model results, a Kalman filter is used to incorporate actual iceberg measurements into the motion model, and statistics from the Kalman filter are used to evaluate model performance. Simulated iceberg motion is found to best coincide with observed iceberg motion in regions where slower iceberg drift speeds are observed. The model is less accurate at high speeds. The iceberg motion model is inverted to produce estimates of ... |
format |
Text |
author |
Stuart, Keith Mitchell |
author_facet |
Stuart, Keith Mitchell |
author_sort |
Stuart, Keith Mitchell |
title |
Application of SeaWinds Scatterometer Data to the Study of Antarctic Icebergs |
title_short |
Application of SeaWinds Scatterometer Data to the Study of Antarctic Icebergs |
title_full |
Application of SeaWinds Scatterometer Data to the Study of Antarctic Icebergs |
title_fullStr |
Application of SeaWinds Scatterometer Data to the Study of Antarctic Icebergs |
title_full_unstemmed |
Application of SeaWinds Scatterometer Data to the Study of Antarctic Icebergs |
title_sort |
application of seawinds scatterometer data to the study of antarctic icebergs |
publisher |
BYU ScholarsArchive |
publishDate |
2012 |
url |
https://scholarsarchive.byu.edu/etd/3371 https://scholarsarchive.byu.edu/context/etd/article/4370/viewcontent/ETD_CISOPTR_3425.pdf |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Iceberg* Southern Ocean |
genre_facet |
Antarc* Antarctic Iceberg* Southern Ocean |
op_source |
Theses and Dissertations |
op_relation |
https://scholarsarchive.byu.edu/etd/3371 https://scholarsarchive.byu.edu/context/etd/article/4370/viewcontent/ETD_CISOPTR_3425.pdf |
op_rights |
http://lib.byu.edu/about/copyright/ |
_version_ |
1772176975360688128 |