July–September rainfall in the Greater Horn of Africa: the combined influence of the Mascarene and South Atlantic highs

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cg.contributor.donorForeign, Commonwealth and Development Office, United Kingdom
cg.contributor.donorNational Centre of Atmospheric Science
cg.coverage.countryEthiopia
cg.coverage.iso3166-alpha2ET
cg.coverage.regionAfrica
cg.coverage.regionEastern Africa
cg.coverage.subregionSouth Atlantic High
cg.coverage.subregionMascarene High
cg.creator.identifierMeron Teferi Taye: 0000-0002-4687-4622
cg.identifier.doihttps://doi.org/10.1007/s00382-022-06287-0
cg.identifier.iwmilibraryH051082
cg.isijournalISI Journal
cg.issn0930-7575
cg.issue11-12
cg.journalClimate Dynamics
cg.reviewStatusPeer Review
cg.volume59
dc.contributor.authorDyer, E.
dc.contributor.authorHirons, L.
dc.contributor.authorTaye, Meron Teferi
dc.date.accessioned2022-04-30T22:05:38Zen
dc.date.available2022-04-30T22:05:38Zen
dc.identifier.urihttps://hdl.handle.net/10568/119427
dc.titleJuly–September rainfall in the Greater Horn of Africa: the combined influence of the Mascarene and South Atlantic highsen
dcterms.abstractJuly-September rainfall is a key component of Ethiopia’s annual rainfall and is a source of rainfall variability throughout inland Greater Horn of Africa. In this study we investigate the relative influences of the Mascarene (MH) and South Atlantic (AH) highs on July-September rainfall in a covarying region of the Greater Horn of Africa using CHIRPS observed rainfall and the ERA5 reanalysis. We show that a mixed metric using the circulation at 850 hPa of these two subtropical anticyclones (AH-MH), is better correlated with rainfall than individual high circulations. Variations in remote circulation are translated by changes in Central African westerlies and Turkana Jet wind speeds. We apply the AH-MH mixed metric to the CMIP5 and CMIP6 ensembles and show that it is a good indicator of mean July-September rainfall across both ensembles. Biases in circulation are shown to be related to the Hadley circulation in CMIP5 atmosphere-only simulations, while causes of biases in CMIP6 are more varied. Coupled model biases are related to southern ocean warm biases in CMIP5 and western Indian Ocean warm biases in CMIP6. CMIP6 shows an improved relationship between rainfall and Turkana Jet winds and Central African westerlies across the ensemble.en
dcterms.accessRightsOpen Access
dcterms.available2022-04-28
dcterms.bibliographicCitationDyer, E.; Hirons, L.; Taye, Meron Teferi. 2022. July–September rainfall in the Greater Horn of Africa: the combined influence of the Mascarene and South Atlantic highs. Climate Dynamics, 59(11-12):3621-3641. [doi: https://doi.org/10.1007/s00382-022-06287-0]en
dcterms.extentp. 3621-3641
dcterms.issued2022-12
dcterms.languageen
dcterms.licenseCC-BY-4.0
dcterms.publisherSpringer
dcterms.subjectrainfall patternsen
dcterms.subjectprecipitationen
dcterms.subjectatmospheric circulationen
dcterms.subjectsubtropical climateen
dcterms.subjectmodelsen
dcterms.subjectdatasetsen
dcterms.typeJournal Article

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