| 1. Identity statement | ||||
| Reference Type | Conference Paper (Conference Proceedings) | |||
| Site | mtc-m16b.sid.inpe.br | |||
| Holder Code | isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S | |||
| Repository | cptec.inpe.br/adm_conf/2005/10.28.13.36 | |||
| Last Update | 2006:04.16.18.05.52 (UTC) administrator | |||
| Metadata Repository | cptec.inpe.br/adm_conf/2005/10.28.13.36.07 | |||
| Metadata Last Update | 2018:06.05.03.42.49 (UTC) administrator | |||
| Citation Key | AzevedoLucMolRamCon:2006:StApDe | |||
| Title | Stochastic approach to describe rainfall climatology and phenomenology over Angola  | |||
| Format | CD-ROM, On-line. | |||
| Year | 2006 | |||
| Access Date | 2024, Dec. 26 | |||
| Secondary Type | PRE CI | |||
| Number of Files | 1 | |||
| Size | 507 KiB | |||
| 2. Context | ||||
| Author | 1 Azevedo, Maria Gariela de 2 Lucio, Paulo Sérgio 3 Molion, Luiz Carlos B. 4 Ramos, Andréa Malheiro 5 Conde, Fábio Cunha | |||
| Affiliation | 1 Ministerio dos Correios e Telecomunicações, Luanda ? Angola. (de Azevedo) 2 Centro de Geofísica de Évora (CGE) - Portugal. (Lucio, Ramos, Conde) 3 Universidade Federal de Alagoas (UFAL) - Brazil. (Molion) | |||
| Author e-Mail Address | 1 gabzevedo@yahoo.com.br 2 pslucio@uevora.pt 3 andreara@uevora.pt 4 fabconde@uevora.pt 5 molion@radar.ufal.br | |||
| Editor | Vera, Carolina Nobre, Carlos | |||
| e-Mail Address | pslucio@uevora.pt | |||
| Conference Name | International Conference on Southern Hemisphere Meteorology and Oceanography, 8 (ICSHMO). | |||
| Conference Location | Foz do Iguaçu | |||
| Date | 24-28 Apr. 2006 | |||
| Publisher | American Meteorological Society (AMS) | |||
| Publisher City | 45 Beacon Hill Road, Boston, MA, USA | |||
| Pages | 1469-1475 | |||
| Book Title | Proceedings | |||
| Tertiary Type | Oral | |||
| Organization | American Meteorological Society (AMS) | |||
| History (UTC) | 2005-10-28 13:36:07 :: pslucio@uevora.pt -> adm_conf :: 2005-12-16 01:24:45 :: adm_conf -> pslucio@uevora.pt :: 2006-03-25 14:55:27 :: pslucio@uevora.pt -> lise@dpi.inpe.br :: 2006-04-06 20:38:47 :: lise@dpi.inpe.br -> adm_conf :: 2006-04-07 11:42:37 :: adm_conf -> administrator :: 2006-04-18 21:00:54 :: administrator -> lise@dpi.inpe.br :: 2010-12-28 12:36:27 :: lise@dpi.inpe.br -> administrator :: 2010-12-29 15:56:24 :: administrator -> lise@dpi.inpe.br :: 2006 2010-12-29 16:05:49 :: lise@dpi.inpe.br -> administrator :: 2006 2010-12-29 18:52:13 :: administrator -> banon :: 2006 2011-01-02 17:14:49 :: banon -> administrator :: 2006 2018-06-05 03:42:49 :: administrator -> :: 2006 | |||
| 3. Content and structure | ||||
| Is the master or a copy? | is the master | |||
| Content Stage | completed | |||
| Transferable | 1 | |||
| Keywords | ENSO ITCZ MJO rainfall variability trends and drifts | |||
| Abstract | Probably, there is a relationship between warm and cold events in the tropical eastern South Atlantic and summer rainfall over Angola and Namibia. These events appear to originate as equatorial Kelvin waves in response to modulations of the trade winds over the tropical South Atlantic. It is well-known that the Southeast Atlantic warm events influence not only the coastal rainfall of tropical Southwestern Africa, but also there is a significant relationship between winter frontal rainfall in Southwestern South Africa and mid-latitude SST patterns, involving shifts in the jet stream and storm-tracks over the mid-latitudes. The objectives of this research work were: (1) Analyse the climate and the phenomena that influence precipitation in different regions of Angola. (2) Provide better understanding of regional rainfall climatology. (3) Make rainfall regime prognostic and future climate, which are important to managing the natural and hydrological resources and planning human activities. Over Angola, the rainfall exhibits quasi-regular low-frequency variability on both interannual and intraseasonal time scales. However, many aspects of the interrelationship between intraseasonal and interannual modes, especially the linkage between Madden-Julian Oscillation (MJO) and the El Niño South Oscillation (ENSO) phenomenon have not been described yet, i.e. whether ENSO and MJO modulate or alter each other. Considering the latitude, Angola should have a typically tropical climate. However, four factors are crucial over the local weather definition, determining the climate of Angola based on (1) the migration of the Intertropical Front (ITF) and/or the Intertropical Convergence Zone (ITCZ), (2) the displacement of the South Atlantic anticyclone associated to the cold phase of the Benguela Current, (3) the Namibia Desert and (4) the altitude of the central region. The mean NDJFMA rainfall and rain variance during 1951-1980 indicated largest variability to the south of Angola as well as in the Indian Ocean ITCZ corresponding to the large mean rainfall in the studied-region. The rain variance in summer is dominated by the SST of Benguela Current and the African ITCZ. The Southwestern Africa is influenced by the Subtropical High Centre Pressures of the Southern Atlantic Anticyclon, which controls the seasonal oscillation of the trade winds of marine influence the marine trade winds - and their continental adaptation the continental trade winds. In the dry regime, the NE trade winds are more intense. During the rainy season, they flow parallel to the coast usually, becoming marine trade winds. The results revealed that the precipitation regime in the analysed stations has a vell marked annual cycle, with rainfall concentrated in the South Hemisphere summer, which is the period of intense convection, September-April. The annual cycle is related to the waxing and waning of the ITCZ, that migrates northward to approximately 12ºN, in August-September; and southward, to approximately 4ºS, in March-April. The annual cycle of the series corresponding to those stations, were similar, despite the differences of intensity registered. The rainfall presented long-term variability that seems to be related with the PDO (20-30 years) and high frequency variability apparently related with ENSO events (3-7 years). It was clear that African Southwestern climate variability is related to global climate variability. Further work is required to test the dynamical hypotheses on ENSO's impact on Southern Hemisphere summer climate. During the studied period, strong influence of the Benguela's Niño was noticed, originating an increasing precipitation drift. Future work includes data analysis of neighboring countries, submitted to robust statistical tests in order to improve their consistency, investigating, among others, the interdecadal variability of the ITCZ, and its relationship with the Benguela Current and planetary structures, such as ENSO, NAO, and PDO. Longer-term changes in the ITCZ displacement have high social and economic impacts through severe droughts or flooding over areas of its influence. | |||
| Area | MET | |||
| Type | Understanding long-term climate variations in the SH | |||
| doc Directory Content | access | |||
| source Directory Content |
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| agreement Directory Content | there are no files | |||
| 4. Conditions of access and use | ||||
| data URL | http://urlib.net/ibi/cptec.inpe.br/adm_conf/2005/10.28.13.36 | |||
| zipped data URL | http://urlib.net/zip/cptec.inpe.br/adm_conf/2005/10.28.13.36 | |||
| Language | en | |||
| Target File | 1469-1476.pdf | |||
| User Group | pslucio@uevora.pt lise@dpi.inpe.br administrator | |||
| Visibility | shown | |||
| 5. Allied materials | ||||
| Host Collection | cptec.inpe.br/nobre/2005/06.02.21.14 cptec.inpe.br/walmeida/2003/04.25.17.12 | |||
| 6. Notes | ||||
| Mark | 1 | |||
| Empty Fields | archivingpolicy archivist callnumber contenttype copyholder copyright creatorhistory descriptionlevel dissemination documentstage doi edition group identifier isbn issn label lineage mirrorrepository nextedition nexthigherunit notes numberofvolumes orcid parameterlist parentrepositories previousedition previouslowerunit progress project readergroup readpermission resumeid rightsholder schedulinginformation secondarydate secondarykey secondarymark serieseditor session shorttitle sponsor subject tertiarymark url versiontype volume | |||