Now showing items 1-20 of 71

    • A distinct and reproducible teleconnection pattern over North America during extreme El Nino events 

      Beniche, M.; Vialard, J.; Lengaigne, M.; Voldoire, A.; Gangiredla, S.; Hall, N.M.J. (Nature Publishing Group, 2024)
      El Nino-Southern Oscillation (ENSO) teleconnections are an important predictability source for extratropical seasonal climate forecasts. Previous studies suggest that the ENSO teleconnection pattern depends on the ENSO ...
    • A modeling study of processes controlling the Bay of Bengal sea surface salinity interannual variability 

      Akhil, V.P.; Lengaigne, M.; Vialard, J.; Durand, F.; Keerthi, M.G.; Chaitanya, A.V.S.; Papa, F.; Gopalakrishna, V.V.; Montegut, de B.C. (John Wiley & Sons, Ltd, 2016)
      Recent observational studies provided preliminary insights on the interannual variability of Bay of Bengal (BoB) Sea Surface Salinity (SSS), but are limited by the poor data coverage. Here, we describe the BoB interannual ...
    • A modeling study of the processes of surface salinity seasonal cycle in the Bay of Bengal. 

      Akhil, V.P.; Durand, F.; Lengaigne, M.; Vialard, J.; Keerthi, M.G.; Gopalakrishna, V.V.; Deltel, C.; Papa, F.; Montegut, C.deB. (AGU, 2014)
      In response to the Indian Monsoon freshwater forcing, the Bay of Bengal exhibits a very strong seasonal cycle in sea surface salinity (SSS), especially near the mouths of the Ganges-Brahmaputra and along the east coast of ...
    • A roadmap to IndOOS-2: Better observations of the rapidly-warming Indian Ocean 

      Beal, L.M.; Vialard, J.; Roxy, M.K.; Li, J.; Andres, M.; Annamalai, H.; Feng, M.; Han, W.; Hood, R.; Lee, T.; Lengaigne, M.; Lumpkin, R.; Masumoto, Y.; McPhaden, M.J.; Ravichandran, M.; Shinoda, T.; Sloyan, B.M.; Strutton, P.G.; Subramanian, A.C.; Tozuka, T.; Ummenhofer, C.C.; Unnikrishnan, A.S.; Wiggert, J.; Yu, L.; Cheng, L.; Desbruyeres, D.G.; Parvathi, V. (American Meteorological Society, 2020)
      The Indian Ocean Observing System (IndOOS), established in 2006, is a multinational network of sustained oceanic measurements that underpin understanding and forecasting of weather and climate for the Indian Ocean region ...
    • 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 ...
    • A sustained ocean observing system in the indian ocean for climate related scientific knowledge and societal needs 

      Hermes, J.C.; Masumoto, Y.; Beal, L.M.; Roxy, M.K.; Vialard, J.; Andres, M.; Annamalai, H.; Behera, S.; DeAdamo, N.; Doi, T.; Feng, M.; Han, W.; Hardman-Mountford, N.; Hendon, H.; Hood, R.; Kido, S.; Lee, C.; Lee, T.; Lengaigne, M.; Li, J.; Lumpkin, R.; Navaneeth, K.N.; Milligan, B.; McPhaden, M.J.; Ravichandran, M.; Shinoda, T.; Singh, A.; Sloyan, B.; Strutton, P.G.; Subramanian, A.C.; Thurston, S.; Tozuka, T.; Ummenhofer, C.C.; Unnikrishnan, A.S.; Venkatesan, R.; Wang, D.; Wiggert, J.; Yu, L.; Yu, W. (2019)
      The Indian Ocean is warming faster than any of the global oceans and its climate is uniquely driven by the presence of a landmass at low latitudes, which causes monsoonal winds and reversing currents. The food, water, and ...
    • About the role of westerly wind events in the possible development of an El Nino in 2014 

      Menkes, C.E.; Lengaigne, M.; Vialard, J.; Puy, M.; Marchesiello, P.; Cravatte, S.; Cambon, G. (American Geophysical Union, 2014)
      Similarities between early 1997 and 2014 has prompted climate scientists to wonder if an El Niño matching the 1997 “El Niño of the century” could develop in 2014. Until April 2014, the equatorial Pacific exhibited positive ...
    • 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 ...
    • Assessing CMIP Models Ability to Detect Observed Surface Warming Signals Related to Climate Change 

      Gopika, S.; Lengaigne, M.; Suresh, I.; Izumo, T.; Kwatra, S.; Neetu, S.; Vialard, J. (American Metrolgical Society, 2024)
      Assessing if CMIP models can detect observed climate change signals is crucial for evaluating their realism and strengthening confidence in future projections. These signals can only be compared once distinguishable from ...
    • Assessment of seasonal and year-to-year surface salinity signals retrieved from SMOS and Aquarius missions in the Bay of Bengal 

      Akhil, V.P.; Lengaigne, M.; Durand, F.; Vialard, J.; Chaitanya, A.V.S.; Keerthi, M.G.; Gopalakrishna, V.V.; Boutin, J.; de Boyer, M.C. (Taylor & Francis, 2016)
      The Bay of Bengal (BoB) exhibits a wide range of sea surface salinity (SSS), with very fresh water induced by heavy monsoonal precipitation and river run-offs to the north, and saltier water to the south. This is a ...
    • Bay of Bengal Sea surface salinity variability using a decade of improved SMOS re-processing 

      Akhil, V.P.; Vialard, J.; Lengaigne, M.; Keerthi, M.G.; Boutin, J.; Vergely, J.L.; Papa, F. (Elsevier Inc., 2020)
      Monsoon rain and rivers bring large freshwater input to the Northern Bay of Bengal (BoB), yielding low Sea Surface Salinity (SSS) after the monsoon. The resulting sharp upper-ocean salinity stratification is thought to ...
    • Comparison of tropical cyclogenesis indices on seasonal to interannual timescales 

      Menkes, C.E.; Lengaigne, M.; Marchesiello, P.; Jourdain, N.C.; Vincent, E.M.; Lefevre, J.; Chauvin, F.; Royer, J.-F. (Springer-Verlag, 2012)
      The performances of four cyclogenesis indices against observed tropical cyclone genesis on a global scale over the period 1979–2001 are evaluated. These indices are: the Genesis Potential Index; the Yearly Genesis Parameter; ...
    • Contribution of tropical cyclones to the air-sea CO2 flux: A global view 

      Levy, M.; Lengaigne, M.; Bopp, L.; Vincent, E.M.; Madec, G.; Ethe, C.; DileepKumar, M.; Sarma, V.V.S.S. (American Geophysical Union, 2012)
      Previous case studies have illustrated the strong local influence of tropical cyclones (TCs) on CO sub(2) air-sea flux (F sub(CO2)), suggesting that they can significantly contribute to the global F sub(CO2). In this study, ...
    • Decadal and long-term sea level variability in the tropical Indo-Pacific Ocean 

      Nidheesh, A.G.; Lengaigne, M.; Vialard, J.; Unnikrishnan, A.S.; Dayan, H. (Springer, 2013)
      Decadal and long-term steric sea level variations over 1966-2007 period in the Indo-Pacific sector were analysed using an ocean general circulation model forced by reanalysis winds. The simulated steric sea level compares ...
    • 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 contribution of atmospheric nonlinearities to ENSO asymmetry and extreme El Nino events 

      Gangiredla, S.; Vialard, J.; Liu, F.; Voldoire, A.; Izumo, T.; Guilyardi, E.; Lengaigne, M. (Nature Publishing Group, 2024)
      Extreme El Nino events have outsized impacts and strongly contribute to the El Nino Southern Oscillation (ENSO) warm/cold phase asymmetries. There is currently no consensus on the respective importance of oceanic and ...
    • 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 ...
    • Drivers of Future Indian Ocean Warming and Its Spatial Pattern in CMIP Models 

      Gopika, S.; Sadhvi, K.; Vialard, J.; Danielli, V.; Neetu, S; Lengaigne, M. (Wiley, 2025)
      Coupled Model Intercomparison Project phases 5 and 6 (CMIP5/6) projections display substantial inter-model diversity in the future tropical Indian Ocean warming magnitude and spatial pattern. Here, we investigate the ...
    • Extreme Events 

      Lengaigne, M.; Feng, M.; Neetu, S.; Barbary, D.; Ramsay, H.A.; Vialard, J.; Walsh, K. (CLIVAR/IOC-GOOS Indian Ocean Region Panel (IORP), 2019)
      Extreme Events such as Tropical cyclones, Marine heat waves (MHW) etc has to be accurately observed. TC intensification is influenced by SST and upper ocean stratification, while MHWs are influenced by air-sea flux and ...