Browsing by Author "Izumo, T."
Now showing items 1-18 of 18
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A simple estimation of equatorial Pacific response from windstress to untangle Indian Ocean dipole and basin influences on El Nino
Izumo, T.; Vialard, J.; Dayan, H.; Lengaigne, M.; Suresh, I. (Springer, 2016)Sea Surface Temperature (SST) anomalies that develop in spring in the central Pacific are crucial to the El Nino Southern Oscillation (ENSO) development. Here we use a linear, continuously stratified, ocean model, and its ... -
A Subsurface Indian Ocean Dipole Response to Tropical Volcanic Eruptions
Izumo, T.; Khodri, M.; Lengaigne, M.; Suresh, I. (John Wiley & Sons, 2018)The impacts of explosive volcanism on the densely populated Indian Ocean (IO) region remain elusive. Dedicated sensitivity experiments indicate that tropical volcanic eruptions induce a stronger surface cooling over Africa ... -
Aliasing of the Indian Ocean externally-forced warming spatial pattern by internal climate variability
Gopika, S.; Izumo, T.; Vialard, J.; Lengaigne, M.; Suresh, I.; RameshKumar, M.R. (2020)Coupled Model Intercomparison Project (CMIP5) models project an inhomogeneous anthropogenic surface warming of the Indian Ocean by the end of the 21st century, with strongest warming in the Arabian Sea and Western equatorial ... -
Do regions outside the tropical Pacific influence ENSO through atmospheric teleconnections?
Dayan, H.; Izumo, T.; Vialard, J.; Lengaigne, M.; Masson, S (Springer, 2015)This paper aims at identifying oceanic regions outside the tropical Pacific, which may influence the El Niño Southern Oscillation (ENSO) through interannual modulation of equatorial Pacific winds An Atmospheric General ... -
Dominant role of winds near Sri Lanka in driving seasonal sea level variations along the west coast of India
Suresh, I.; Vialard, J.; Izumo, T.; Lengaigne, M.; Han, W.; McCreary, J.; Muraleedharan, P.M. (American Geophysical Union Publications, 2016)The strong seasonal cycle of sea level along the west coast of India (WCI) has important consequences for ecosystem and fisheries, and the Lakshadweep high/low in the southeast Arabian Sea is important for fisheries and ... -
Further Insights on the Influence of the Indian Ocean Dipole on the Following Year's ENSO from Observations and CMIP5 Models
Jourdain, N.C.; Lengaigne, M.; Vialard, J.; Izumo, T.; Gupta, A.S. (American Meteorological Society, 2016)Recent observational studies have suggested that negative and positive Indian Ocean dipole (IOD) events (nIOD and pIOD, respectively) favor a transition toward, respectively, El Niño and La Niña events one year later. ... -
Influence of ENSO on the Pacific decadal oscillation in CMIP models
Nidheesh, A.G.; Lengaigne, M.; Vialard, J.; Izumo, T.; Unnikrishnan, A.S.; Cassou, C. (Springer, 2017)Emerging decadal climate predictions call for an assessment of decadal climate variability in the Coupled Model Intercomparison Project (CMIP) database. In this paper, we evaluate the influence of El Ni�o Southern Oscillation ... -
Intrinsic versus wind-forced great whirl non-seasonal variability
Sadhvi, K.; Suresh, I.; Lengaigne, M.; Izumo, T.; Penduff, T.; Molines, J.-M.; Can, A.A.; Vialard, J. (John Wiley & Sons, Ltd, 2024)The Great Whirl (GW) is a quasi-permanent anticyclonic eddy that appears every summer monsoon offshore of the Somalia upwelling. The annual cycle of the GW is well described, but deviations from its mean seasonal cycle ... -
Natural decadal sea-level variability in the Indian Ocean: lessons from CMIP models
Nidheesh, A.G.; Lengaigne, M.; Vialard, J.; Izumo, T.; Unnikrishnan, A.S.; Krishnan, R. (2019)Indian Ocean decadal sea-level variability is an active research area, with many unresolved questions due to inadequate observational coverage. In this study, we analyse 26 Coupled Model Intercomparison Project (CMIP) ... -
On the physical interpretation of the lead relation between Warm Water Volume and the El Ni�o Southern Oscillation
Izumo, T.; Lengaigne, M.; Vialard, J.; Suresh, I.; Planton, Y. (Springer Berlin Heidelberg, 2019)The Warm Water Volume (WWV), a proxy for the equatorial Pacific heat content, is the most widely used oceanic precursor of the El Ni�o Southern Oscillation (ENSO). The standard interpretation of this lead relation in the ... -
Relevance of Relative Sea Surface Temperature for Tropical Rainfall Interannual Variability
Izumo, T.; Vialard, J.; Lengaigne, M.; Suresh, I. (Blackwell Publishing Ltd, 2020)The coupling between sea surface temperature (SST) anomalies and rainfall is an important driver of tropical climate variability. Observations however reveal inconsistencies, such as decreased convective rainfall in regions ... -
Remote influences on the Indian monsoon low-level jet intraseasonal variations
Swathi, M.S.; Izumo, T.; Lengaigne, M.; Vialard, J.; RameshKumar, M.R. (Springer, 2020)A strong low-level jet (LLJ), also known as the Findlater jet, develops over the Arabian Sea during the Indian summer monsoon. This jet is an essential source of moisture for monsoonal rainfall over the densely-populated ... -
Robust Projected Weakening of Winter Monsoon Winds Over the Arabian Sea Under Climate Change
Parvathi, V.; Suresh, I.; Lengaigne, M.; Izumo, T.; Vialard, J. (Wiley, 2017)The response of the Indian winter monsoon to climate change has received considerably less attention than that of the summer monsoon. We show here that all Coupled Model Intercomparison Project Phase 5 (CMIP5) models display ... -
Robustness of observation-based decadal sea level variability in the Indo-Pacific Ocean
Nidheesh, A.G.; Lengaigne, M.; Vialard, J.; Izumo, T.; Unnikrishnan, A.S.; Meyssignac, B.; Hamlington, B.; Montegut, C.D. (Wiley, 2017)We examine the consistency of Indo-Pacific decadal sea level variability in 10 gridded, observation-based sea level products for the 1960-2010 period. Decadal sea level variations are robust in the Pacific, with more than ... -
Role of intersecting equatorial and coastal waveguides near sri lanka on intraseasonal sea level variability along the West Coast of India
Suresh, I.; Vialard, J.; Izumo, T.; Lengaigne, M. (John Wiley & Sons, Ltd, 2024)The sea level variations along the west coast of India (WCI) significantly affect the ecosystems and fisheries, because of their tight coupling with the oxycline depths in this region, which hosts the world's largest natural ... -
Sea Level Interannual Variability Along the West Coast of India
Suresh, I.; Vialard, J.; Lengaigne, M.; Izumo, T.; Parvathi, V.; Muraleedharan, P.M. (John Wiley & Sons, 2018)Interannual sea level anomalies (SLA), and the related thermocline variations, along the west coast of India (WCI) strongly impact the ecosystems, fisheries, and potentially the monsoon rainfall. Here we investigate the ... -
Tropical explosive volcanic eruptions can trigger El Ni�o by cooling tropical Africa
Khodri, M.; Izumo, T.; Vialard, J.; Janicot, S.; Cassou, C.; Lengaigne, M.; Mignot, J.; Gastineau, G.; Guilyardi, E.; Lebas, N.; Robock, A.; McPhaden, M.J. (Nature Publishing Group, 2017)Stratospheric aerosols from large tropical explosive volcanic eruptions backscatter shortwave radiation and reduce the global mean surface temperature. Observations suggest that they also favour an El Ni�o within 2 years ... -
Western Pacific Oceanic Heat Content: A Better Predictor of La Ni�a Than of El Ni�o
Planton, Y.; Vialard, J.; Guilyardi, E.; Lengaigne, M.; Izumo, T. (John Wiley & Sons, 2018)The western equatorial Pacific oceanic heat content (warm water volume in the west or WWVw) is the best El Ni�o-Southern Oscillation (ENSO) predictor beyond 1-year lead. Using observations and selected Coupled Model ...