Coherent fluctuations of extratropical geopotential height and tropical convection in intraseasonal time scales
Northern-Hemisphere twice-daily 500-mb-geopotential-height data for November-March 1975-1980 and November-December 1981 and NOAA satellite measurements of outgoing longwave radiation for the same period are processed to remove seasonal cycles and Fourier-decomposition bandpassed to study variations...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19860063311 2023-05-15T17:32:23+02:00 Coherent fluctuations of extratropical geopotential height and tropical convection in intraseasonal time scales Lau, K.-M. Phillips, T. J. Unclassified, Unlimited, Publicly available Jun 1, 1986 http://ntrs.nasa.gov/search.jsp?R=19860063311 unknown http://ntrs.nasa.gov/search.jsp?R=19860063311 Accession ID: 86A48049 Copyright Other Sources 47 Journal of the Atmospheric Sciences; 43; 1164-118 1986 ftnasantrs 2012-02-15T16:51:20Z Northern-Hemisphere twice-daily 500-mb-geopotential-height data for November-March 1975-1980 and November-December 1981 and NOAA satellite measurements of outgoing longwave radiation for the same period are processed to remove seasonal cycles and Fourier-decomposition bandpassed to study variations with 20-70-d periods. The results of analysis using correlation, complex EOF, and composite techniques are presented in extensive maps and graphs and characterized. Extratropical wavetrains are found to evolve systematically from Eurasia eastward to North America and the North Atlantic on 5-6-d time scales, while the intraseasonal variation in tropical convection is dominated by a dipolelike east-west feature propagating from the western Indian Ocean to the dateline with a quasi-period of 40-50 d. The possibility that normal modes coupled between the tropics and midlatitudes may be responsible for these phenomena is considered. Other/Unknown Material North Atlantic NASA Technical Reports Server (NTRS) Indian |
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NASA Technical Reports Server (NTRS) |
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47 |
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47 Lau, K.-M. Phillips, T. J. Coherent fluctuations of extratropical geopotential height and tropical convection in intraseasonal time scales |
topic_facet |
47 |
description |
Northern-Hemisphere twice-daily 500-mb-geopotential-height data for November-March 1975-1980 and November-December 1981 and NOAA satellite measurements of outgoing longwave radiation for the same period are processed to remove seasonal cycles and Fourier-decomposition bandpassed to study variations with 20-70-d periods. The results of analysis using correlation, complex EOF, and composite techniques are presented in extensive maps and graphs and characterized. Extratropical wavetrains are found to evolve systematically from Eurasia eastward to North America and the North Atlantic on 5-6-d time scales, while the intraseasonal variation in tropical convection is dominated by a dipolelike east-west feature propagating from the western Indian Ocean to the dateline with a quasi-period of 40-50 d. The possibility that normal modes coupled between the tropics and midlatitudes may be responsible for these phenomena is considered. |
format |
Other/Unknown Material |
author |
Lau, K.-M. Phillips, T. J. |
author_facet |
Lau, K.-M. Phillips, T. J. |
author_sort |
Lau, K.-M. |
title |
Coherent fluctuations of extratropical geopotential height and tropical convection in intraseasonal time scales |
title_short |
Coherent fluctuations of extratropical geopotential height and tropical convection in intraseasonal time scales |
title_full |
Coherent fluctuations of extratropical geopotential height and tropical convection in intraseasonal time scales |
title_fullStr |
Coherent fluctuations of extratropical geopotential height and tropical convection in intraseasonal time scales |
title_full_unstemmed |
Coherent fluctuations of extratropical geopotential height and tropical convection in intraseasonal time scales |
title_sort |
coherent fluctuations of extratropical geopotential height and tropical convection in intraseasonal time scales |
publishDate |
1986 |
url |
http://ntrs.nasa.gov/search.jsp?R=19860063311 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Indian |
geographic_facet |
Indian |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19860063311 Accession ID: 86A48049 |
op_rights |
Copyright |
_version_ |
1766130476166152192 |