caa a22 4500 445799412 CHVBK 20180317145136.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s00704-010-0306-7 doi (NATIONALLICENCE)springer-10.1007/s00704-010-0306-7 On the relative roles of El Nino and Indian Ocean Dipole events on the Monsoon Onset over Kerala [Elektronische Daten] [Syam Sankar, M. Kumar, Chris Reason] Interannual variations of the monsoon onset over Kerala (MOK) have been studied using data from over 60years (1948-2009) of NCEP/NCAR reanalysis and outgoing long-wave radiation. The sea surface temperature fields over the North Indian Ocean associated with the MOK have been examined in association with El Nino and Indian Ocean Dipole (IOD) events which originate in the Pacific and Indian Ocean, respectively. An analysis of the tropical convective maximum showed significant differences in its strength and location during the El Nino, IOD, early, normal, and delayed MOK composites. Further, we also looked into the role of the convective systems formed over the Arabian Sea and Bay of Bengal on MOK. The most significant features during early (delayed) MOK years is the abnormal persistence of westerlies (easterlies) several days prior to MOK and enhanced (suppressed) deep convection over the southeastern Arabian Sea and the southern Bay of Bengal. Moisture builds up over peninsular India several pentads prior to MOK during La Nina, negative IOD, and concurrent La Nina and negative IOD years as compared to the El Nino, positive IOD, and concurrent El Nino and positive IOD years, indicating its significant role on MOK. The monsoon Hadley cell and Walker circulations are weaker (stronger) during a delayed (early) MOK. Further, the sea surface temperature anomalies in the western Pacific are negative (positive) during delayed (early) MOK. Springer-Verlag, 2010 Sankar Syam Physical Oceanography Division, National Institute of Oceanography, 403004, Dona Paula, Goa, India aut Kumar M. Physical Oceanography Division, National Institute of Oceanography, 403004, Dona Paula, Goa, India aut Reason Chris Oceanography Department, University of Cape Town, Cape Town, South Africa aut Theoretical and Applied Climatology Springer Vienna 103/3-4(2011-03-01), 359-374 0177-798X 103:3-4<359 2011 103 704 https://doi.org/10.1007/s00704-010-0306-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00704-010-0306-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sankar Syam Physical Oceanography Division, National Institute of Oceanography, 403004, Dona Paula, Goa, India aut NATIONALLICENCE 700 1- Kumar M. Physical Oceanography Division, National Institute of Oceanography, 403004, Dona Paula, Goa, India aut NATIONALLICENCE 700 1- Reason Chris Oceanography Department, University of Cape Town, Cape Town, South Africa aut NATIONALLICENCE 773 0- Theoretical and Applied Climatology Springer Vienna 103/3-4(2011-03-01), 359-374 0177-798X 103:3-4<359 2011 103 704 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer