caa a22 4500 605472572 CHVBK 20210128100338.0 cr unu---uuuuu 210128e20151201xx s 000 0 eng 10.1007/s00382-015-2555-8 doi (NATIONALLICENCE)springer-10.1007/s00382-015-2555-8 Revisiting El Niño Modokis [Elektronische Daten] [Shamal Marathe, Karumuri Ashok, P. Swapna, T. Sabin] The suggestion that there exist two types of El Niño in the tropical Pacific has generated a debate in the community. Applying various linear and non-linear approaches and composite analysis technique on observed and reanalyzed climate datasets primarily for the 1950-2010 period, we revisit the variability of the tropical Pacific in the light of this debate. Our objective is to examine whether the proposed El Niño Modokis need a classification distinct from canonical El Niños. Even if the distinction is subject to short data records, we demonstrate that the El Niño Modoki events indeed display a seasonal evolution and teleconnections different from the canonical El Niños, and that the distinction is not subject to inclusion of the two extreme El Niños 1982 and 1997 as canonical El Niños. We show that the El Niño Modoki events are not an artifact associated with the orthogonality constraint associated with the EOF technique. Our cluster analysis shows that evolutions of the canonical El Niño and El Niño Modokis through various seasons differ from one another. Importantly, the dynamic and thermodynamic air-sea coupling strength is distinctly different between the El Niño Modoki and the canonical El Niño events. We find that, dynamic feedback intensity is stronger for El Niño Modoki (canonical El Niño) during boreal summer (winter); though the air-sea coupling strength, a major contributor to Bjerknes feedback, is maximum for Modokis during the developing stages, it decreases thereafter. In case of thermodynamic feedback intensity, SST-wind-evaporation feedback is dominant for El Niños while SST-SHF feedback is important during El Niño Modokis. However, we find that the thermodynamic feedback values significantly differ across the flux datasets. Springer-Verlag Berlin Heidelberg, 2015 El Niño nationallicence El Niño Modoki nationallicence Teleconnections nationallicence Air-sea interaction nationallicence Coupled processes nationallicence Marathe Shamal Center for Climate Change Research, Indian Institute of Tropical Meteorology, Pune, India aut Ashok Karumuri Center for Climate Change Research, Indian Institute of Tropical Meteorology, Pune, India aut Swapna P. Center for Climate Change Research, Indian Institute of Tropical Meteorology, Pune, India aut Sabin T. Center for Climate Change Research, Indian Institute of Tropical Meteorology, Pune, India aut Climate Dynamics Springer Berlin Heidelberg 45/11-12(2015-12-01), 3527-3545 0930-7575 45:11-12<3527 2015 45 382 https://doi.org/10.1007/s00382-015-2555-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00382-015-2555-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Marathe Shamal Center for Climate Change Research, Indian Institute of Tropical Meteorology, Pune, India aut NATIONALLICENCE 700 1- Ashok Karumuri Center for Climate Change Research, Indian Institute of Tropical Meteorology, Pune, India aut NATIONALLICENCE 700 1- Swapna P. Center for Climate Change Research, Indian Institute of Tropical Meteorology, Pune, India aut NATIONALLICENCE 700 1- Sabin T. Center for Climate Change Research, Indian Institute of Tropical Meteorology, Pune, India aut NATIONALLICENCE 773 0- Climate Dynamics Springer Berlin Heidelberg 45/11-12(2015-12-01), 3527-3545 0930-7575 45:11-12<3527 2015 45 382