Intraseasonal Relationships Between Tropical Heating and Extratropical Jets
Intraseasonal variations of the northern midlatitude circulation and their relationships with the global tropical heating field are investigated using climate model fields. The greatest intraseasonal variance in the midlatitude flow is found in the vicinity of the time mean jets, and in the areas im...
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ftdtic:ADA260212 2023-05-15T17:30:12+02:00 Intraseasonal Relationships Between Tropical Heating and Extratropical Jets Neith, Michael T. NAVAL POSTGRADUATE SCHOOL MONTEREY CA 1992-12-14 text/html http://www.dtic.mil/docs/citations/ADA260212 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA260212 en eng http://www.dtic.mil/docs/citations/ADA260212 Approved for public release; distribution is unlimited. Document partially illegible. DTIC AND NTIS Meteorology *WEATHER FORECASTING *JET STREAMS ANOMALIES PROPAGATION GLOBAL VARIATIONS KINETIC ENERGY PATTERNS FLOW OSCILLATION INDIAN OCEAN NORTH PACIFIC OCEAN ATMOSPHERE MODELS NORTH ATLANTIC OCEAN CIRCULATION MEAN TROPICAL REGIONS CLIMATE HEATING TIME ENERGY THESES TELECOMMUNICATIONS INTRASEASONAL OSCILLATIONS TROPICAL HEATING EXTRATROPICAL JETS JET EXITS HEATING ANOMALIES TROPICAL WESTERN PACIFIC TROPICAL EASTERN PACIFIC TROPICAL HEAT SOURCES Text 1992 ftdtic 2016-02-22T10:34:37Z Intraseasonal variations of the northern midlatitude circulation and their relationships with the global tropical heating field are investigated using climate model fields. The greatest intraseasonal variance in the midlatitude flow is found in the vicinity of the time mean jets, and in the areas immediately downstream of these jet exits. The model kinetic energy field associated with these jets shows a clear 30-60 day variation and eastward propagation within and between the different jet regions. This intraseasonal behavior is found to be well correlated with heating anomalies in specific parts of the global tropics. For each of the jet regions, we use a simple composite analysis to identify the global heating patterns associated with periods of strong and weak flow. For the North Pacific jet, strong flow occurs during and after periods of positive heating anomalies in the tropical western and central Pacific, and negative heating anomalies in the Indian Ocean. Conversely, The North Pacific flow is weak when these heating anomalies are reversed. The North Atlantic jet shows comparable relationships, with positive heating anomalies in the tropical western and eastern Pacific, and negative heating anomalies in the tropical Indian and Atlantic Oceans, before and during periods of strong flow. These intraseasonal teleconnections between individual jets and the global tropical heating field are especially clear for the North Pacific and North Atlantic jets. In addition to relatively direct forcing from nearby tropical heat sources, the jets may be influenced by relatively remote tropical heat sources, whose signals propagate through upstream jets. Text North Atlantic Defense Technical Information Center: DTIC Technical Reports database Indian Pacific |
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Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
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ftdtic |
language |
English |
topic |
Meteorology *WEATHER FORECASTING *JET STREAMS ANOMALIES PROPAGATION GLOBAL VARIATIONS KINETIC ENERGY PATTERNS FLOW OSCILLATION INDIAN OCEAN NORTH PACIFIC OCEAN ATMOSPHERE MODELS NORTH ATLANTIC OCEAN CIRCULATION MEAN TROPICAL REGIONS CLIMATE HEATING TIME ENERGY THESES TELECOMMUNICATIONS INTRASEASONAL OSCILLATIONS TROPICAL HEATING EXTRATROPICAL JETS JET EXITS HEATING ANOMALIES TROPICAL WESTERN PACIFIC TROPICAL EASTERN PACIFIC TROPICAL HEAT SOURCES |
spellingShingle |
Meteorology *WEATHER FORECASTING *JET STREAMS ANOMALIES PROPAGATION GLOBAL VARIATIONS KINETIC ENERGY PATTERNS FLOW OSCILLATION INDIAN OCEAN NORTH PACIFIC OCEAN ATMOSPHERE MODELS NORTH ATLANTIC OCEAN CIRCULATION MEAN TROPICAL REGIONS CLIMATE HEATING TIME ENERGY THESES TELECOMMUNICATIONS INTRASEASONAL OSCILLATIONS TROPICAL HEATING EXTRATROPICAL JETS JET EXITS HEATING ANOMALIES TROPICAL WESTERN PACIFIC TROPICAL EASTERN PACIFIC TROPICAL HEAT SOURCES Neith, Michael T. Intraseasonal Relationships Between Tropical Heating and Extratropical Jets |
topic_facet |
Meteorology *WEATHER FORECASTING *JET STREAMS ANOMALIES PROPAGATION GLOBAL VARIATIONS KINETIC ENERGY PATTERNS FLOW OSCILLATION INDIAN OCEAN NORTH PACIFIC OCEAN ATMOSPHERE MODELS NORTH ATLANTIC OCEAN CIRCULATION MEAN TROPICAL REGIONS CLIMATE HEATING TIME ENERGY THESES TELECOMMUNICATIONS INTRASEASONAL OSCILLATIONS TROPICAL HEATING EXTRATROPICAL JETS JET EXITS HEATING ANOMALIES TROPICAL WESTERN PACIFIC TROPICAL EASTERN PACIFIC TROPICAL HEAT SOURCES |
description |
Intraseasonal variations of the northern midlatitude circulation and their relationships with the global tropical heating field are investigated using climate model fields. The greatest intraseasonal variance in the midlatitude flow is found in the vicinity of the time mean jets, and in the areas immediately downstream of these jet exits. The model kinetic energy field associated with these jets shows a clear 30-60 day variation and eastward propagation within and between the different jet regions. This intraseasonal behavior is found to be well correlated with heating anomalies in specific parts of the global tropics. For each of the jet regions, we use a simple composite analysis to identify the global heating patterns associated with periods of strong and weak flow. For the North Pacific jet, strong flow occurs during and after periods of positive heating anomalies in the tropical western and central Pacific, and negative heating anomalies in the Indian Ocean. Conversely, The North Pacific flow is weak when these heating anomalies are reversed. The North Atlantic jet shows comparable relationships, with positive heating anomalies in the tropical western and eastern Pacific, and negative heating anomalies in the tropical Indian and Atlantic Oceans, before and during periods of strong flow. These intraseasonal teleconnections between individual jets and the global tropical heating field are especially clear for the North Pacific and North Atlantic jets. In addition to relatively direct forcing from nearby tropical heat sources, the jets may be influenced by relatively remote tropical heat sources, whose signals propagate through upstream jets. |
author2 |
NAVAL POSTGRADUATE SCHOOL MONTEREY CA |
format |
Text |
author |
Neith, Michael T. |
author_facet |
Neith, Michael T. |
author_sort |
Neith, Michael T. |
title |
Intraseasonal Relationships Between Tropical Heating and Extratropical Jets |
title_short |
Intraseasonal Relationships Between Tropical Heating and Extratropical Jets |
title_full |
Intraseasonal Relationships Between Tropical Heating and Extratropical Jets |
title_fullStr |
Intraseasonal Relationships Between Tropical Heating and Extratropical Jets |
title_full_unstemmed |
Intraseasonal Relationships Between Tropical Heating and Extratropical Jets |
title_sort |
intraseasonal relationships between tropical heating and extratropical jets |
publishDate |
1992 |
url |
http://www.dtic.mil/docs/citations/ADA260212 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA260212 |
geographic |
Indian Pacific |
geographic_facet |
Indian Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA260212 |
op_rights |
Approved for public release; distribution is unlimited. Document partially illegible. |
_version_ |
1766126037977006080 |