Environmental steering flow analysis for central north Pacific tropical cyclones based on NCEP/NCAR reanalysis data
xii, 93 leaves An environmental steering flow analysis for central north Pacific tropical cyclones was made utilizing model wind data from the NCEP/NCAR Reanalysis project, since no aircraft or rawinsonde data are readily available in this region. The results are compared with previous work performe...
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ftunivhawaiimano:oai:scholarspace.manoa.hawaii.edu:10125/7009 2023-05-15T17:34:43+02:00 Environmental steering flow analysis for central north Pacific tropical cyclones based on NCEP/NCAR reanalysis data Reynes, Anthony Stevens, Duane Meteorology 2003-08 application/pdf http://hdl.handle.net/10125/7009 unknown University of Hawaii at Manoa Theses for the degree of Master of Science (University of Hawaii at Manoa). Meteorology; no. 3806 http://hdl.handle.net/10125/7009 All UHM dissertations and theses 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. https://scholarspace.manoa.hawaii.edu/handle/10125/2099 Thesis Text 2003 ftunivhawaiimano 2022-07-17T13:23:20Z xii, 93 leaves An environmental steering flow analysis for central north Pacific tropical cyclones was made utilizing model wind data from the NCEP/NCAR Reanalysis project, since no aircraft or rawinsonde data are readily available in this region. The results are compared with previous work performed in other hurricane basins. Tropical cyclone best track data were obtained from the Central North Pacific Hurricane Center. Most of the cyclonic activity analyzed in this project was observed at latitudes below 20°N, where most tropical cyclones followed a general west to northwestward track. Environmental steering was defined as a 5°-7° annulus around the cyclone center. On average, tropical cyclones were observed to move faster than the environmental steering flow, moving to the right of the environmental flow at the midlower tropospheric levels between 850 and 600 mb, and to the left at higher levels. These results show agreement with previous work for the north Atlantic basin, and disagree with most previous results for the north-west Pacific (where most cyclones show movement to the left of the environmental steering flow at all levels). Out of 36 candidate steering layers, two were identified as the recommended steering layers for different cyclone intensities: 850-400 mb for tropical storms and depressions, and 850-300 mb for hurricanes. The differences between these steering layers and tropical cyclone motion are smaller south of 20°N, especially southeast of the Hawaiian islands. The possibility of a direct relationship between wind shear and the environmental steering flow was also investigated, but no correlation between these two variables was found. Thesis North Atlantic ScholarSpace at University of Hawaii at Manoa Pacific |
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ScholarSpace at University of Hawaii at Manoa |
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ftunivhawaiimano |
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unknown |
description |
xii, 93 leaves An environmental steering flow analysis for central north Pacific tropical cyclones was made utilizing model wind data from the NCEP/NCAR Reanalysis project, since no aircraft or rawinsonde data are readily available in this region. The results are compared with previous work performed in other hurricane basins. Tropical cyclone best track data were obtained from the Central North Pacific Hurricane Center. Most of the cyclonic activity analyzed in this project was observed at latitudes below 20°N, where most tropical cyclones followed a general west to northwestward track. Environmental steering was defined as a 5°-7° annulus around the cyclone center. On average, tropical cyclones were observed to move faster than the environmental steering flow, moving to the right of the environmental flow at the midlower tropospheric levels between 850 and 600 mb, and to the left at higher levels. These results show agreement with previous work for the north Atlantic basin, and disagree with most previous results for the north-west Pacific (where most cyclones show movement to the left of the environmental steering flow at all levels). Out of 36 candidate steering layers, two were identified as the recommended steering layers for different cyclone intensities: 850-400 mb for tropical storms and depressions, and 850-300 mb for hurricanes. The differences between these steering layers and tropical cyclone motion are smaller south of 20°N, especially southeast of the Hawaiian islands. The possibility of a direct relationship between wind shear and the environmental steering flow was also investigated, but no correlation between these two variables was found. |
author2 |
Stevens, Duane Meteorology |
format |
Thesis |
author |
Reynes, Anthony |
spellingShingle |
Reynes, Anthony Environmental steering flow analysis for central north Pacific tropical cyclones based on NCEP/NCAR reanalysis data |
author_facet |
Reynes, Anthony |
author_sort |
Reynes, Anthony |
title |
Environmental steering flow analysis for central north Pacific tropical cyclones based on NCEP/NCAR reanalysis data |
title_short |
Environmental steering flow analysis for central north Pacific tropical cyclones based on NCEP/NCAR reanalysis data |
title_full |
Environmental steering flow analysis for central north Pacific tropical cyclones based on NCEP/NCAR reanalysis data |
title_fullStr |
Environmental steering flow analysis for central north Pacific tropical cyclones based on NCEP/NCAR reanalysis data |
title_full_unstemmed |
Environmental steering flow analysis for central north Pacific tropical cyclones based on NCEP/NCAR reanalysis data |
title_sort |
environmental steering flow analysis for central north pacific tropical cyclones based on ncep/ncar reanalysis data |
publisher |
University of Hawaii at Manoa |
publishDate |
2003 |
url |
http://hdl.handle.net/10125/7009 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Theses for the degree of Master of Science (University of Hawaii at Manoa). Meteorology; no. 3806 http://hdl.handle.net/10125/7009 |
op_rights |
All UHM dissertations and theses 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. https://scholarspace.manoa.hawaii.edu/handle/10125/2099 |
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1766133646780006400 |