Intraseasonal variability of high-resolution Doppler imager winds in the equatorial mesosphere and lower thermosphere
Analyses of high‐resolution Doppler imager (HRDI) daytime equatorial zonal winds indicate significant variability on time scales of 20–121 days. These appear as transient oscillations in the equatorial zonal mean zonal wind between 70 and 100 km. The oscillations are characterized by two maxima near...
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| Veröffentlicht in: | Journal of Geophysical Research, Washington, DC Washington, DC, 1998-05, Vol.103 (D10), p.11221-11228 |
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| container_title | Journal of Geophysical Research, Washington, DC |
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| creator | Lieberman, Ruth S. |
| description | Analyses of high‐resolution Doppler imager (HRDI) daytime equatorial zonal winds indicate significant variability on time scales of 20–121 days. These appear as transient oscillations in the equatorial zonal mean zonal wind between 70 and 100 km. The oscillations are characterized by two maxima near 75 and 95 km that are out of phase, separated by a minimum near 80 km. These features move downward in time and exhibit equatorial symmetry with maximum values at the equator. During 1994, maximum amplitudes of the intraseasonal oscillation are 20 m s−1 in January and 30 m s−1 in June. The intraseasonal variability present in HRDI winds is qualitatively consistent with variations on similar timescales reported at Christmas Island. It has been hypothesized that the wind patterns at Christmas Island result from modulated gravity wave driving [Eckermann et al, 1997]. The results of the present study strongly support this view. |
| doi_str_mv | 10.1029/98JD00532 |
| format | Article |
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These appear as transient oscillations in the equatorial zonal mean zonal wind between 70 and 100 km. The oscillations are characterized by two maxima near 75 and 95 km that are out of phase, separated by a minimum near 80 km. These features move downward in time and exhibit equatorial symmetry with maximum values at the equator. During 1994, maximum amplitudes of the intraseasonal oscillation are 20 m s−1 in January and 30 m s−1 in June. The intraseasonal variability present in HRDI winds is qualitatively consistent with variations on similar timescales reported at Christmas Island. It has been hypothesized that the wind patterns at Christmas Island result from modulated gravity wave driving [Eckermann et al, 1997]. The results of the present study strongly support this view.</description><identifier>ISSN: 0148-0227</identifier><identifier>EISSN: 2156-2202</identifier><identifier>DOI: 10.1029/98JD00532</identifier><language>eng</language><publisher>Washington, DC: Blackwell Publishing Ltd</publisher><subject>Earth, ocean, space ; Exact sciences and technology ; External geophysics ; Marine ; Physics of the high neutral atmosphere ; Tides, waves, convection, winds, turbulence</subject><ispartof>Journal of Geophysical Research, Washington, DC, 1998-05, Vol.103 (D10), p.11221-11228</ispartof><rights>Copyright 1998 by the American Geophysical Union.</rights><rights>1998 INIST-CNRS</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c4970-19c357fca12490447922d30ade851fa6b72bd94b7e061b60dd3a423578a99c6c3</citedby><cites>FETCH-LOGICAL-c4970-19c357fca12490447922d30ade851fa6b72bd94b7e061b60dd3a423578a99c6c3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1029%2F98JD00532$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1029%2F98JD00532$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,776,780,1411,1427,11493,27901,27902,45550,45551,46384,46443,46808,46867</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=2308966$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Lieberman, Ruth S.</creatorcontrib><title>Intraseasonal variability of high-resolution Doppler imager winds in the equatorial mesosphere and lower thermosphere</title><title>Journal of Geophysical Research, Washington, DC</title><addtitle>J. Geophys. Res</addtitle><description>Analyses of high‐resolution Doppler imager (HRDI) daytime equatorial zonal winds indicate significant variability on time scales of 20–121 days. These appear as transient oscillations in the equatorial zonal mean zonal wind between 70 and 100 km. The oscillations are characterized by two maxima near 75 and 95 km that are out of phase, separated by a minimum near 80 km. These features move downward in time and exhibit equatorial symmetry with maximum values at the equator. During 1994, maximum amplitudes of the intraseasonal oscillation are 20 m s−1 in January and 30 m s−1 in June. The intraseasonal variability present in HRDI winds is qualitatively consistent with variations on similar timescales reported at Christmas Island. It has been hypothesized that the wind patterns at Christmas Island result from modulated gravity wave driving [Eckermann et al, 1997]. The results of the present study strongly support this view.</description><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>External geophysics</subject><subject>Marine</subject><subject>Physics of the high neutral atmosphere</subject><subject>Tides, waves, convection, winds, turbulence</subject><issn>0148-0227</issn><issn>2156-2202</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1998</creationdate><recordtype>article</recordtype><recordid>eNqFkU1vEzEQhlcIJKK2B_6BDwiJw1J_rT-OKKGhpYIKgXq0Zr3exuCst_YuIf--hkS5IeYy0uh53pFmquoVwe8IpvpSq5sVxg2jz6oFJY2oKcX0ebXAhKsaUypfVhc5_8CleCM4Jotqvh6mBNlBjgME9AuSh9YHP-1R7NHGP2zq5HIM8-TjgFZxHINLyG_hobSdH7qM_ICmjUPucYYpFj2gbTHyuHHJIRg6FOKuwIVJ2-P4vHrRQ8ju4tjPqu9XH74tP9a3X9bXy_e3teVa4ppoyxrZWyCUa8y51JR2DEPnVEN6EK2kbad5Kx0WpBW46xhwWhQFWlth2Vn15pA7pvg4uzyZrc_WhQCDi3M2RBGipBD_ByWVinBewLcH0KaYc3K9GVO5Rtobgs2fJ5jTEwr7-hgK2ULoEwzW55NAGVb67-7LA7bzwe3_nWdu1l9XjaK4GPXB8Hlyv08GpJ9GSCYbc_95bfj93R3-RJlZsifmMaRk</recordid><startdate>19980527</startdate><enddate>19980527</enddate><creator>Lieberman, Ruth S.</creator><general>Blackwell Publishing Ltd</general><general>American Geophysical Union</general><scope>BSCLL</scope><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TN</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope><scope>7TG</scope><scope>KL.</scope></search><sort><creationdate>19980527</creationdate><title>Intraseasonal variability of high-resolution Doppler imager winds in the equatorial mesosphere and lower thermosphere</title><author>Lieberman, Ruth S.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4970-19c357fca12490447922d30ade851fa6b72bd94b7e061b60dd3a423578a99c6c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1998</creationdate><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>External geophysics</topic><topic>Marine</topic><topic>Physics of the high neutral atmosphere</topic><topic>Tides, waves, convection, winds, turbulence</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Lieberman, Ruth S.</creatorcontrib><collection>Istex</collection><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Oceanic Abstracts</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><jtitle>Journal of Geophysical Research, Washington, DC</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Lieberman, Ruth S.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Intraseasonal variability of high-resolution Doppler imager winds in the equatorial mesosphere and lower thermosphere</atitle><jtitle>Journal of Geophysical Research, Washington, DC</jtitle><addtitle>J. Geophys. Res</addtitle><date>1998-05-27</date><risdate>1998</risdate><volume>103</volume><issue>D10</issue><spage>11221</spage><epage>11228</epage><pages>11221-11228</pages><issn>0148-0227</issn><eissn>2156-2202</eissn><abstract>Analyses of high‐resolution Doppler imager (HRDI) daytime equatorial zonal winds indicate significant variability on time scales of 20–121 days. These appear as transient oscillations in the equatorial zonal mean zonal wind between 70 and 100 km. The oscillations are characterized by two maxima near 75 and 95 km that are out of phase, separated by a minimum near 80 km. These features move downward in time and exhibit equatorial symmetry with maximum values at the equator. During 1994, maximum amplitudes of the intraseasonal oscillation are 20 m s−1 in January and 30 m s−1 in June. The intraseasonal variability present in HRDI winds is qualitatively consistent with variations on similar timescales reported at Christmas Island. 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| ispartof | Journal of Geophysical Research, Washington, DC, 1998-05, Vol.103 (D10), p.11221-11228 |
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| language | eng |
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| source | Wiley Free Content; Wiley-Blackwell AGU Digital Library; Wiley Online Library Journals Frontfile Complete; Alma/SFX Local Collection |
| subjects | Earth, ocean, space Exact sciences and technology External geophysics Marine Physics of the high neutral atmosphere Tides, waves, convection, winds, turbulence |
| title | Intraseasonal variability of high-resolution Doppler imager winds in the equatorial mesosphere and lower thermosphere |
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