Southern hemisphere low level wind circulation statisticsfrom the Seasat scatterometer
Analyses of remotely sensed low-level wind vector data over the Southern Ocean are performed. Five-day averages and monthly means are created and the month-to-month variability during the winter (July-September) of 1978 is investigated. The remotely sensed winds are compared to the Australian Bureau...
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ftdoajarticles:oai:doaj.org/article:320c023a9b9c4c9c96cbf49dde500ce3 2023-05-15T18:25:30+02:00 Southern hemisphere low level wind circulation statisticsfrom the Seasat scatterometer Gad Levy https://doaj.org/article/320c023a9b9c4c9c96cbf49dde500ce3 EN eng Copernicus Publications http://www.ann-geophys.net/12/65/1994/angeo-12-65-1994.html https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 0992-7689 1432-0576 https://doaj.org/article/320c023a9b9c4c9c96cbf49dde500ce3 Annales Geophysicae, Vol 12, Iss 1, Pp 65-79 (0000) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article ftdoajarticles 2022-12-31T08:09:29Z Analyses of remotely sensed low-level wind vector data over the Southern Ocean are performed. Five-day averages and monthly means are created and the month-to-month variability during the winter (July-September) of 1978 is investigated. The remotely sensed winds are compared to the Australian Bureau of Meteorology (ABM) and the National Meteorological Center (NMC) surface analyses. In southern latitudes the remotely sensed winds are stronger than what the weather services' analyses suggest, indicating underestimation by ABM and NMC in these regions. The evolution of the low-level jet and the major stormtracks during the season are studied and different flow regimes are identified. The large-scale variability of the meridional flow is studied with the aid of empirical orthogonal function (EOF) analysis. The dominance of quasi-stationary wave numbers 3, 4, and 5 in the winter flow is evident in both the EOF analysis and the mean flow. The signature of an exceptionally strong blocking situation is evident in July and the special conditions leading to it are discussed. A very large intraseasonal variability with different flow regimes at different months is documented. Article in Journal/Newspaper Southern Ocean Directory of Open Access Journals: DOAJ Articles Southern Ocean |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 Gad Levy Southern hemisphere low level wind circulation statisticsfrom the Seasat scatterometer |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
Analyses of remotely sensed low-level wind vector data over the Southern Ocean are performed. Five-day averages and monthly means are created and the month-to-month variability during the winter (July-September) of 1978 is investigated. The remotely sensed winds are compared to the Australian Bureau of Meteorology (ABM) and the National Meteorological Center (NMC) surface analyses. In southern latitudes the remotely sensed winds are stronger than what the weather services' analyses suggest, indicating underestimation by ABM and NMC in these regions. The evolution of the low-level jet and the major stormtracks during the season are studied and different flow regimes are identified. The large-scale variability of the meridional flow is studied with the aid of empirical orthogonal function (EOF) analysis. The dominance of quasi-stationary wave numbers 3, 4, and 5 in the winter flow is evident in both the EOF analysis and the mean flow. The signature of an exceptionally strong blocking situation is evident in July and the special conditions leading to it are discussed. A very large intraseasonal variability with different flow regimes at different months is documented. |
format |
Article in Journal/Newspaper |
author |
Gad Levy |
author_facet |
Gad Levy |
author_sort |
Gad Levy |
title |
Southern hemisphere low level wind circulation statisticsfrom the Seasat scatterometer |
title_short |
Southern hemisphere low level wind circulation statisticsfrom the Seasat scatterometer |
title_full |
Southern hemisphere low level wind circulation statisticsfrom the Seasat scatterometer |
title_fullStr |
Southern hemisphere low level wind circulation statisticsfrom the Seasat scatterometer |
title_full_unstemmed |
Southern hemisphere low level wind circulation statisticsfrom the Seasat scatterometer |
title_sort |
southern hemisphere low level wind circulation statisticsfrom the seasat scatterometer |
publisher |
Copernicus Publications |
url |
https://doaj.org/article/320c023a9b9c4c9c96cbf49dde500ce3 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Annales Geophysicae, Vol 12, Iss 1, Pp 65-79 (0000) |
op_relation |
http://www.ann-geophys.net/12/65/1994/angeo-12-65-1994.html https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 0992-7689 1432-0576 https://doaj.org/article/320c023a9b9c4c9c96cbf49dde500ce3 |
_version_ |
1766206996875313152 |