Evidence of change after 2001 in the seasonal behaviour of the mesopause region from airglow data at El Leoncito
Airglow intensities and rotational temperatures of the OH(6-2) and O2b(0-1) bands acquired at El Leoncito (32°S, 69°W) provide good annual coverage in 1998-2002, 2006, and 2007, with between 192 and 311 nights of observation per year. These data can therefore be used to derive the seasonal variation...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_02731177_v44_n3_p401_Reisin |
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todo:paper_02731177_v44_n3_p401_Reisin2023-10-03T15:15:39Z Evidence of change after 2001 in the seasonal behaviour of the mesopause region from airglow data at El Leoncito Reisin, E.R. Scheer, J. Airglow Climatology Interannual variation Mesopause region Seasonal variation Temperature Airglow Airglow data Interannual variation Intraseasonal variability Mesopause region Rotational temperature Seasonal variation Wave activity Climatology Airglow intensities and rotational temperatures of the OH(6-2) and O2b(0-1) bands acquired at El Leoncito (32°S, 69°W) provide good annual coverage in 1998-2002, 2006, and 2007, with between 192 and 311 nights of observation per year. These data can therefore be used to derive the seasonal variations during each of these seven years, in airglow brightness and temperatures at altitudes of 87 and 95 km. From 1998 to 2001, seasonal variations are similar enough so that they can be well represented by a mean climatology, for each parameter. On the other hand, these climatologies do not agree with what is usually observed at other sites, maybe due to the particular orographic conditions at El Leoncito. With respect to the last three fully documented years (2002, 2006, and 2007), the similarity from year to year deteriorates, and there are greater differences in the seasonal behaviour, more or less in all the parameters. The differences include, e.g., maxima occurring earlier or later than "normal", by one or two months. All this may suggest the build-up of a new regime of intraseasonal variability, with a possible relationship to corresponding changes in wave activity. © 2009 COSPAR. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02731177_v44_n3_p401_Reisin |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Airglow Climatology Interannual variation Mesopause region Seasonal variation Temperature Airglow Airglow data Interannual variation Intraseasonal variability Mesopause region Rotational temperature Seasonal variation Wave activity Climatology |
| spellingShingle |
Airglow Climatology Interannual variation Mesopause region Seasonal variation Temperature Airglow Airglow data Interannual variation Intraseasonal variability Mesopause region Rotational temperature Seasonal variation Wave activity Climatology Reisin, E.R. Scheer, J. Evidence of change after 2001 in the seasonal behaviour of the mesopause region from airglow data at El Leoncito |
| topic_facet |
Airglow Climatology Interannual variation Mesopause region Seasonal variation Temperature Airglow Airglow data Interannual variation Intraseasonal variability Mesopause region Rotational temperature Seasonal variation Wave activity Climatology |
| description |
Airglow intensities and rotational temperatures of the OH(6-2) and O2b(0-1) bands acquired at El Leoncito (32°S, 69°W) provide good annual coverage in 1998-2002, 2006, and 2007, with between 192 and 311 nights of observation per year. These data can therefore be used to derive the seasonal variations during each of these seven years, in airglow brightness and temperatures at altitudes of 87 and 95 km. From 1998 to 2001, seasonal variations are similar enough so that they can be well represented by a mean climatology, for each parameter. On the other hand, these climatologies do not agree with what is usually observed at other sites, maybe due to the particular orographic conditions at El Leoncito. With respect to the last three fully documented years (2002, 2006, and 2007), the similarity from year to year deteriorates, and there are greater differences in the seasonal behaviour, more or less in all the parameters. The differences include, e.g., maxima occurring earlier or later than "normal", by one or two months. All this may suggest the build-up of a new regime of intraseasonal variability, with a possible relationship to corresponding changes in wave activity. © 2009 COSPAR. |
| format |
JOUR |
| author |
Reisin, E.R. Scheer, J. |
| author_facet |
Reisin, E.R. Scheer, J. |
| author_sort |
Reisin, E.R. |
| title |
Evidence of change after 2001 in the seasonal behaviour of the mesopause region from airglow data at El Leoncito |
| title_short |
Evidence of change after 2001 in the seasonal behaviour of the mesopause region from airglow data at El Leoncito |
| title_full |
Evidence of change after 2001 in the seasonal behaviour of the mesopause region from airglow data at El Leoncito |
| title_fullStr |
Evidence of change after 2001 in the seasonal behaviour of the mesopause region from airglow data at El Leoncito |
| title_full_unstemmed |
Evidence of change after 2001 in the seasonal behaviour of the mesopause region from airglow data at El Leoncito |
| title_sort |
evidence of change after 2001 in the seasonal behaviour of the mesopause region from airglow data at el leoncito |
| url |
http://hdl.handle.net/20.500.12110/paper_02731177_v44_n3_p401_Reisin |
| work_keys_str_mv |
AT reisiner evidenceofchangeafter2001intheseasonalbehaviourofthemesopauseregionfromairglowdataatelleoncito AT scheerj evidenceofchangeafter2001intheseasonalbehaviourofthemesopauseregionfromairglowdataatelleoncito |
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1807319718675087360 |