Variability of summer rainfall over Madagascar: Climatic determinants at interannual scales
Abstract Variability of convective rainfall in the austral summer season over central Madagascar is studied using an area‐rainfall index, local radiosonde data, and gridded information on outgoing longwave radiation (OLR), sea‐surface temperature, and tropospheric winds. Seasonal rainfall patterns a...
Published in: | International Journal of Climatology |
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crwiley:10.1002/joc.3370151203 2024-06-02T08:14:30+00:00 Variability of summer rainfall over Madagascar: Climatic determinants at interannual scales Jury, Mark R. Parker, B. A. Raholijao, Niri Nassor, Abdallah 1995 http://dx.doi.org/10.1002/joc.3370151203 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.3370151203 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.3370151203 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 15, issue 12, page 1323-1332 ISSN 0899-8418 1097-0088 journal-article 1995 crwiley https://doi.org/10.1002/joc.3370151203 2024-05-03T12:00:22Z Abstract Variability of convective rainfall in the austral summer season over central Madagascar is studied using an area‐rainfall index, local radiosonde data, and gridded information on outgoing longwave radiation (OLR), sea‐surface temperature, and tropospheric winds. Seasonal rainfall patterns are influenced by topography, monsoon and trade wind circulations, and tropical cyclone events. The Inter Tropical Convergence Zone overlies the north‐west coast, where summer rainfall averages 47 cm month −1 . Climatic conditions that affect convective rainfall at interannual time‐scales are studied through spatial lag correlation analysis. Sea‐surface temperature is weakly correlated with rainfall departures, with positive values in the central Indian Ocean reaching +0.41 at lags −4 and 0 months. Strongest positive correlations (+0.45) gradually shift to the central South Atlantic Ocean at lag 0 and +2 months. Wind correlations imply that increased upper level tropical easterly flow overlying enhanced low‐level north‐west monsoon flow favours above normal rainfall. Regional teleconnection patterns identified by rainfall‐OLR correlations are remarkably similar to those for Quasi‐biennial oscillation (QBO)‐OLR correlations, suggesting that up to one‐third of the interannual convective variance can be explained by the phase of the QBO. Article in Journal/Newspaper South Atlantic Ocean Wiley Online Library Austral Indian International Journal of Climatology 15 12 1323 1332 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Variability of convective rainfall in the austral summer season over central Madagascar is studied using an area‐rainfall index, local radiosonde data, and gridded information on outgoing longwave radiation (OLR), sea‐surface temperature, and tropospheric winds. Seasonal rainfall patterns are influenced by topography, monsoon and trade wind circulations, and tropical cyclone events. The Inter Tropical Convergence Zone overlies the north‐west coast, where summer rainfall averages 47 cm month −1 . Climatic conditions that affect convective rainfall at interannual time‐scales are studied through spatial lag correlation analysis. Sea‐surface temperature is weakly correlated with rainfall departures, with positive values in the central Indian Ocean reaching +0.41 at lags −4 and 0 months. Strongest positive correlations (+0.45) gradually shift to the central South Atlantic Ocean at lag 0 and +2 months. Wind correlations imply that increased upper level tropical easterly flow overlying enhanced low‐level north‐west monsoon flow favours above normal rainfall. Regional teleconnection patterns identified by rainfall‐OLR correlations are remarkably similar to those for Quasi‐biennial oscillation (QBO)‐OLR correlations, suggesting that up to one‐third of the interannual convective variance can be explained by the phase of the QBO. |
format |
Article in Journal/Newspaper |
author |
Jury, Mark R. Parker, B. A. Raholijao, Niri Nassor, Abdallah |
spellingShingle |
Jury, Mark R. Parker, B. A. Raholijao, Niri Nassor, Abdallah Variability of summer rainfall over Madagascar: Climatic determinants at interannual scales |
author_facet |
Jury, Mark R. Parker, B. A. Raholijao, Niri Nassor, Abdallah |
author_sort |
Jury, Mark R. |
title |
Variability of summer rainfall over Madagascar: Climatic determinants at interannual scales |
title_short |
Variability of summer rainfall over Madagascar: Climatic determinants at interannual scales |
title_full |
Variability of summer rainfall over Madagascar: Climatic determinants at interannual scales |
title_fullStr |
Variability of summer rainfall over Madagascar: Climatic determinants at interannual scales |
title_full_unstemmed |
Variability of summer rainfall over Madagascar: Climatic determinants at interannual scales |
title_sort |
variability of summer rainfall over madagascar: climatic determinants at interannual scales |
publisher |
Wiley |
publishDate |
1995 |
url |
http://dx.doi.org/10.1002/joc.3370151203 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.3370151203 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.3370151203 |
geographic |
Austral Indian |
geographic_facet |
Austral Indian |
genre |
South Atlantic Ocean |
genre_facet |
South Atlantic Ocean |
op_source |
International Journal of Climatology volume 15, issue 12, page 1323-1332 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.3370151203 |
container_title |
International Journal of Climatology |
container_volume |
15 |
container_issue |
12 |
container_start_page |
1323 |
op_container_end_page |
1332 |
_version_ |
1800738373835423744 |