ENSO influence on the interannual variability of the Red Sea convergence zone and associated rainfall

Handle URI:
http://hdl.handle.net/10754/625880
Title:
ENSO influence on the interannual variability of the Red Sea convergence zone and associated rainfall
Authors:
Dasari, Hari Prasad ( 0000-0003-0628-4481 ) ; Langodan, Sabique ( 0000-0003-0513-1790 ) ; Viswanadhapalli, Yesubabu; Vadlamudi, Brahmananda R.; Papadopoulos, Vassilis P.; Hoteit, Ibrahim ( 0000-0002-3751-4393 )
Abstract:
The Red Sea convergence zone (RSCZ) is formed by opposite surface winds blowing from northwest to southeast directions at around 18°-19°N between October and January. A reverse-oriented, low-level monsoon trough at 850hPa, known as the Red Sea trough (RST), transfers moisture from the southern Red Sea to RSCZ. The positions of the RSCZ and RST and the intensity of the RST have been identified as important factors in modulating weather and climatic conditions across the Middle East. Here, we investigate the influence of the El Niño southern oscillation (ENSO) on the interannual variability of RSCZ, RST, and regional rainfall during winter months. Our results indicate that El Niño (warm ENSO phase) favours a shift of the RSCZ to the north and a strengthening of the RST in the same direction. Conversely, during November and December of La Niña periods (cold ENSO phase), the RSCZ shift to the south and the RST strengthens in the same direction. During El Niño periods, southeasterly wind speeds increase (20-30%) over the southern Red Sea and northwesterly wind speeds decrease (10-15%) over the northern Red Sea. Noticeable increases in the number of rainy days and the intensity of rain events are observed during El Niño phases. These increases are associated with colder than normal air intrusion at lower levels from the north combined with warm air intrusion from the south over the RSCZ. Our analysis suggests that during El Niño winters, warmer sea surface temperatures and higher convective instability over the Red Sea favour local storms conditions and increase rainfall over the Red Sea and adjoining regions.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Dasari HP, Langodan S, Viswanadhapalli Y, Vadlamudi BR, Papadopoulos VP, et al. (2017) ENSO influence on the interannual variability of the Red Sea convergence zone and associated rainfall. International Journal of Climatology. Available: http://dx.doi.org/10.1002/joc.5208.
Publisher:
Wiley-Blackwell
Journal:
International Journal of Climatology
Issue Date:
18-Jul-2017
DOI:
10.1002/joc.5208
Type:
Article
ISSN:
0899-8418
Sponsors:
This research was funded by King Abdullah University of Science and Technology (KAUST) and the Saudi ARAMCO Marine Environmental Research Center at KAUST (SAMERCK). The authors are thankful to Ute Langner (GIS expert) in preparation of background for the Figure 15. This research made use of the resources of the Supercomputing Laboratory and/or computer clusters at KAUST.
Additional Links:
http://onlinelibrary.wiley.com/doi/10.1002/joc.5208/full
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorDasari, Hari Prasaden
dc.contributor.authorLangodan, Sabiqueen
dc.contributor.authorViswanadhapalli, Yesubabuen
dc.contributor.authorVadlamudi, Brahmananda R.en
dc.contributor.authorPapadopoulos, Vassilis P.en
dc.contributor.authorHoteit, Ibrahimen
dc.date.accessioned2017-10-17T10:39:39Z-
dc.date.available2017-10-17T10:39:39Z-
dc.date.issued2017-07-18en
dc.identifier.citationDasari HP, Langodan S, Viswanadhapalli Y, Vadlamudi BR, Papadopoulos VP, et al. (2017) ENSO influence on the interannual variability of the Red Sea convergence zone and associated rainfall. International Journal of Climatology. Available: http://dx.doi.org/10.1002/joc.5208.en
dc.identifier.issn0899-8418en
dc.identifier.doi10.1002/joc.5208en
dc.identifier.urihttp://hdl.handle.net/10754/625880-
dc.description.abstractThe Red Sea convergence zone (RSCZ) is formed by opposite surface winds blowing from northwest to southeast directions at around 18°-19°N between October and January. A reverse-oriented, low-level monsoon trough at 850hPa, known as the Red Sea trough (RST), transfers moisture from the southern Red Sea to RSCZ. The positions of the RSCZ and RST and the intensity of the RST have been identified as important factors in modulating weather and climatic conditions across the Middle East. Here, we investigate the influence of the El Niño southern oscillation (ENSO) on the interannual variability of RSCZ, RST, and regional rainfall during winter months. Our results indicate that El Niño (warm ENSO phase) favours a shift of the RSCZ to the north and a strengthening of the RST in the same direction. Conversely, during November and December of La Niña periods (cold ENSO phase), the RSCZ shift to the south and the RST strengthens in the same direction. During El Niño periods, southeasterly wind speeds increase (20-30%) over the southern Red Sea and northwesterly wind speeds decrease (10-15%) over the northern Red Sea. Noticeable increases in the number of rainy days and the intensity of rain events are observed during El Niño phases. These increases are associated with colder than normal air intrusion at lower levels from the north combined with warm air intrusion from the south over the RSCZ. Our analysis suggests that during El Niño winters, warmer sea surface temperatures and higher convective instability over the Red Sea favour local storms conditions and increase rainfall over the Red Sea and adjoining regions.en
dc.description.sponsorshipThis research was funded by King Abdullah University of Science and Technology (KAUST) and the Saudi ARAMCO Marine Environmental Research Center at KAUST (SAMERCK). The authors are thankful to Ute Langner (GIS expert) in preparation of background for the Figure 15. This research made use of the resources of the Supercomputing Laboratory and/or computer clusters at KAUST.en
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://onlinelibrary.wiley.com/doi/10.1002/joc.5208/fullen
dc.rightsThis is the peer reviewed version of the following article: ENSO influence on the interannual variability of the Red Sea convergence zone and associated rainfall, which has been published in final form at http://doi.org/10.1002/joc.5208. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.en
dc.subjectENSOen
dc.subjectMoisture convergenceen
dc.subjectRainfallen
dc.subjectRed Sea convergence zoneen
dc.subjectRed Sea troughen
dc.titleENSO influence on the interannual variability of the Red Sea convergence zone and associated rainfallen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalInternational Journal of Climatologyen
dc.eprint.versionPost-printen
dc.contributor.institutionWeather and Climate Research Group; National Atmospheric Research Laboratory; Tirupati Andhra Pradesh Indiaen
dc.contributor.institutionCentro de Previsão de Tempo e Estudos Climáticos (CPTECH); Instituto Nacional de Pesquisas Espaciais; Sao Jose dos Campos Brazilen
kaust.authorDasari, Hari Prasaden
kaust.authorLangodan, Sabiqueen
kaust.authorHoteit, Ibrahimen
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