Influence of Antarctic Oscillation on Intraseasonal Variability of Large-Scale Circulations Over the Western North Pacific
This study examines Southern Hemisphere mid-latitude wave variations connected to the Antarctic Oscillation (AAO) to establish connections with the 15- to 25-day wave activity in the western North Pacific monsoon trough region. The AAO index defined from the leading empirical orthogonal functions of...
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ftdtic:ADA432612 2023-05-15T14:05:30+02:00 Influence of Antarctic Oscillation on Intraseasonal Variability of Large-Scale Circulations Over the Western North Pacific Burton, Kenneth R., Jr NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF METEOROLOGY 2005-03 text/html http://www.dtic.mil/docs/citations/ADA432612 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA432612 en eng http://www.dtic.mil/docs/citations/ADA432612 Approved for public release; distribution is unlimited., Availability: This document is not available from DTIC in microfiche. DTIC AND NTIS Geography Electricity and Magnetism *SOUTHERN HEMISPHERE *OSCILLATION *ANTARCTIC REGIONS PEAK VALUES FLUX(RATE) ENERGY THESES REDUCTION WAVES ORTHOGONALITY FUNCTIONS(MATHEMATICS) NORTH PACIFIC OCEAN MONSOONS TEMPERATE REGIONS *ANTARCTIC OSCILLATION ROSSBY WAVE DISPERSION LARGE-SCALE TROPICAL CIRCULATIONS Text 2005 ftdtic 2016-02-21T10:27:23Z This study examines Southern Hemisphere mid-latitude wave variations connected to the Antarctic Oscillation (AAO) to establish connections with the 15- to 25-day wave activity in the western North Pacific monsoon trough region. The AAO index defined from the leading empirical orthogonal functions of 700 hPa height anomalies led to seven distinct circulation patterns that vary in conjunction with the 15- to 25-day monsoon trough mode. For nearly one half of the significant events the onset of 15- to 25-day monsoon trough convective activity coincided with a peak negative AAO index and the peak in monsoon trough convection coincided with a peak positive index. The remaining events either occur when the AAO is not significantly varying or when the AAO-related Southern Hemisphere mid-latitude circulations do not match 15- to 25-day transitions. When a significant connection occurs between the Southern Hemisphere mid-latitude circulations related to the AAO and the 15- to 25-day wave activity in the western North Pacific monsoon trough, the mechanism is via equatorward Rossby-wave dispersion. When wave energy flux in the Southern Hemisphere is directed zonally, no connection is established between the AAO and the alternating periods of enhanced and reduced convection in the western North Pacific monsoon trough. The original document contains color images. Text Antarc* Antarctic Defense Technical Information Center: DTIC Technical Reports database Antarctic Pacific The Antarctic |
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Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Geography Electricity and Magnetism *SOUTHERN HEMISPHERE *OSCILLATION *ANTARCTIC REGIONS PEAK VALUES FLUX(RATE) ENERGY THESES REDUCTION WAVES ORTHOGONALITY FUNCTIONS(MATHEMATICS) NORTH PACIFIC OCEAN MONSOONS TEMPERATE REGIONS *ANTARCTIC OSCILLATION ROSSBY WAVE DISPERSION LARGE-SCALE TROPICAL CIRCULATIONS |
spellingShingle |
Geography Electricity and Magnetism *SOUTHERN HEMISPHERE *OSCILLATION *ANTARCTIC REGIONS PEAK VALUES FLUX(RATE) ENERGY THESES REDUCTION WAVES ORTHOGONALITY FUNCTIONS(MATHEMATICS) NORTH PACIFIC OCEAN MONSOONS TEMPERATE REGIONS *ANTARCTIC OSCILLATION ROSSBY WAVE DISPERSION LARGE-SCALE TROPICAL CIRCULATIONS Burton, Kenneth R., Jr Influence of Antarctic Oscillation on Intraseasonal Variability of Large-Scale Circulations Over the Western North Pacific |
topic_facet |
Geography Electricity and Magnetism *SOUTHERN HEMISPHERE *OSCILLATION *ANTARCTIC REGIONS PEAK VALUES FLUX(RATE) ENERGY THESES REDUCTION WAVES ORTHOGONALITY FUNCTIONS(MATHEMATICS) NORTH PACIFIC OCEAN MONSOONS TEMPERATE REGIONS *ANTARCTIC OSCILLATION ROSSBY WAVE DISPERSION LARGE-SCALE TROPICAL CIRCULATIONS |
description |
This study examines Southern Hemisphere mid-latitude wave variations connected to the Antarctic Oscillation (AAO) to establish connections with the 15- to 25-day wave activity in the western North Pacific monsoon trough region. The AAO index defined from the leading empirical orthogonal functions of 700 hPa height anomalies led to seven distinct circulation patterns that vary in conjunction with the 15- to 25-day monsoon trough mode. For nearly one half of the significant events the onset of 15- to 25-day monsoon trough convective activity coincided with a peak negative AAO index and the peak in monsoon trough convection coincided with a peak positive index. The remaining events either occur when the AAO is not significantly varying or when the AAO-related Southern Hemisphere mid-latitude circulations do not match 15- to 25-day transitions. When a significant connection occurs between the Southern Hemisphere mid-latitude circulations related to the AAO and the 15- to 25-day wave activity in the western North Pacific monsoon trough, the mechanism is via equatorward Rossby-wave dispersion. When wave energy flux in the Southern Hemisphere is directed zonally, no connection is established between the AAO and the alternating periods of enhanced and reduced convection in the western North Pacific monsoon trough. The original document contains color images. |
author2 |
NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF METEOROLOGY |
format |
Text |
author |
Burton, Kenneth R., Jr |
author_facet |
Burton, Kenneth R., Jr |
author_sort |
Burton, Kenneth R., Jr |
title |
Influence of Antarctic Oscillation on Intraseasonal Variability of Large-Scale Circulations Over the Western North Pacific |
title_short |
Influence of Antarctic Oscillation on Intraseasonal Variability of Large-Scale Circulations Over the Western North Pacific |
title_full |
Influence of Antarctic Oscillation on Intraseasonal Variability of Large-Scale Circulations Over the Western North Pacific |
title_fullStr |
Influence of Antarctic Oscillation on Intraseasonal Variability of Large-Scale Circulations Over the Western North Pacific |
title_full_unstemmed |
Influence of Antarctic Oscillation on Intraseasonal Variability of Large-Scale Circulations Over the Western North Pacific |
title_sort |
influence of antarctic oscillation on intraseasonal variability of large-scale circulations over the western north pacific |
publishDate |
2005 |
url |
http://www.dtic.mil/docs/citations/ADA432612 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA432612 |
geographic |
Antarctic Pacific The Antarctic |
geographic_facet |
Antarctic Pacific The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA432612 |
op_rights |
Approved for public release; distribution is unlimited., Availability: This document is not available from DTIC in microfiche. |
_version_ |
1766277477351555072 |