A5050266619- Climate variability and models
- Oceanographic and Atmospheric Processes
- Tropical and Extratropical Cyclones Research
- Meteorological Phenomena and Simulations
- Marine and coastal ecosystems
- Ocean Waves and Remote Sensing
- Geophysics and Gravity Measurements
- Geology and Paleoclimatology Research
- Arctic and Antarctic ice dynamics
- Geomagnetism and Paleomagnetism Studies
- Glycosylation and Glycoproteins Research
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Geological and Geophysical Studies
- Coastal and Marine Management
- Fluid Dynamics and Turbulent Flows
- Ocean Acidification Effects and Responses
- Atmospheric Ozone and Climate
- Cryospheric studies and observations
- Coral and Marine Ecosystems Studies
- Hydrology and Drought Analysis
- Climate change impacts on agriculture
- Fluid Dynamics and Vibration Analysis
- Carbohydrate Chemistry and Synthesis
- Astro and Planetary Science
Japan Agency for Marine-Earth Science and Technology
2016-2025
Nanjing University of Information Science and Technology
2020-2024
Hokkaido University
2024
The University of Tokyo
2005-2021
Science Council of Japan
2015-2021
Defence Electronics Application Laboratory
2014-2017
Kyoto University
2017
Ajanta Pharma (India)
2014
Tokyo University of Science
1997-2012
University of York
2010
Using observed data sets mainly for the period 1979–2005, we find that anomalous warming events different from conventional El Niño occur in central equatorial Pacific. This unique Pacific associated with a horseshoe pattern is flanked by colder sea surface temperature anomaly (SSTA) on both sides along equator. empirical orthogonal function (EOF) analysis of monthly tropical SSTA shows these are represented second mode explains 12% variance. Since majority such not part evolution,...
The influence of the recently discovered Indian Ocean Dipole (IOD) on interannual variability summer monsoon rainfall (ISMR) has been investigated for period 1958‐1997. IOD and El Niño/Southern Oscillation (ENSO) have complementarily affected ISMR during last four decades. Whenever ENSO‐ISMR correlation is low (high), IOD‐ISMR high (low). plays an important role as a modulator rainfall, influences between ENSO. We that ENSO‐induced anomalous circulation over region either countered or...
CR Climate Research Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 25:151-169 (2003) - doi:10.3354/cr025151 Possible impacts of Indian Ocean Dipole mode events on global climate N. H. Saji1,3,*, T. Yamagata1,2 1Institute for Global Change Research, 3173-25 Showa-machi, Kanazawa, Kanagawa 236-0001, Japan 2Department Earth and Planetary Sciences, The University Tokyo, Tokyo 113-0033, 3Present...
Beginning from the hypothesis by Bjerknes [1969] that ocean‐atmosphere interaction was essential to El Niño‐Southern Oscillation (ENSO) phenomenon, Tropical Ocean‐Global Atmosphere (TOGA) decade has not only confirmed this but supplied detailed theory for mechanisms setting underlying period and possible responsible irregularity of ENSO. Essentials ocean dynamical adjustment are reviewed an ENSO perspective. Approaches simple atmospheric modeling greatly aided development feedbacks...
The relative influences of the ENSO and Indian Ocean Dipole (IOD) events on summer rainfall were studied using observational data an atmospheric general circulation model (AGCM). composite analysis anomalies demonstrates that IOD, while significantly influencing monsoon rainfall, also reduces impact whenever these with same phase co-occur. AGCM experiments have shown during El Niño event, Walker over tropical Indo–Pacific region is modulated; a low-level anomalous divergence center western...
Sea surface temperature (SST) anomalies in the subtropical southern Indian Ocean show interannual dipole events that are seasonally phase‐locked to austral summer. A positive phase of event is characterized by cold SST eastern part i.e. off Australia and warm southwestern part, south Madagascar. Such an found produce above normal rainfall over many regions south‐central Africa. The cooling mainly caused enhanced evaporation. This associated with stronger winds along edge high, which...
Using an atmospheric general circulation model and observed datasets of sea surface temperature rainfall, we studied the influence Indian Ocean Dipole (IOD) on Australian winter rainfall. The IOD has significant negative partial correlations with rainfall over western southern regions Australia. These extend south‐eastward from Indonesia all way to south east Our sensitivity experiments indicate that cold anomalies prevailing west Indonesian archipelago during positive events introduce...
Tropical cyclones (TC) under different climate conditions in the Northern Hemisphere have been investigated with Max Planck Institute (MPI) coupled (ECHAM5/MPI-OM) and atmosphere (ECHAM5) models. The intensity size of TC depend crucially on resolution higher wind speed smaller scales at resolutions. typical is reduced by a factor 2.3 from T63 to T319 using distance maximum centre storm as measure. full three-dimensional structure storms becomes increasingly more realistic increased.For...
Abstract The variability in the East African short rains is investigated using 41-yr data from observation and 200-yr a coupled general circulation model known as Scale Interaction Experiment-Frontier Research Center for Global Change, version 1 (SINTEX-F1). model-simulated provide scope to understand climate region with better statistical confidence. Most of linked basinwide large-scale mode, that is, Indian Ocean dipole (IOD) tropical Ocean. analysis observed results reveals influence IOD...
We assessed current status of multi-model ensemble (MME) deterministic and probabilistic seasonal prediction based on 25-year (1980–2004) retrospective forecasts performed by 14 climate model systems (7 one-tier 7 two-tier systems) that participate in the Climate Prediction its Application to Society (CliPAS) project sponsored Asian-Pacific Economic Cooperation Center (APCC). also evaluated seven DEMETER models' MME for period 1981–2001 comparison. Based assessment, future direction...
The Luzon Strait transport (LST) from the Pacific into South China Sea (SCS) is examined using results a high-resolution ocean general circulation model. LST model has mean value of 2.4 Sv (Sv ( 106 m3 s 21) and reaches its seasonal maximum (6.1 westward) in winter minimum (0.9 eastward) summer. Both annual variation compare favorably with earlier observations. On an interannual time scale, tends to be higher during El Nino years lower La Nina years, (minimum) leading mature phase (La Nina)...
Abstract An atmosphere–ocean coupled general circulation model known as the Scale Interaction Experiment Frontier version 1 (SINTEX-F1) is used to understand intrinsic variability of Indian Ocean dipole (IOD). In addition a globally control experiment, Pacific decoupled noENSO experiment has been conducted. latter, El Niño–Southern Oscillation (ENSO) suppressed by decoupling tropical from atmosphere. The ocean–atmosphere conditions related IOD are realistically simulated both experiments...
During El Niño Southern Oscillation events modest anomalies amplify spatially and temporally until the entire tropical Pacific Ocean global atmospheric circulation are affected. Unstable interactions between ocean atmosphere could cause this amplification when release of latent heat by affects in such a manner that altered surface winds induce further heat. Coupled shallow water models used to simulate instability which is modulated seasonal movements convergence zones.
Abstract Climate variability in the tropical Indo-Pacific sector has undergone dramatic changes under global ocean warming. Extreme Indian Ocean dipole (IOD) events occurred repeatedly recent decades with an unprecedented series of three consecutive episodes during 2006–08, causing vast climate and socioeconomic effects worldwide weakening historic El Niño–Indian monsoon relationship. Major attention been paid to Niño influence on Ocean, but how IOD influences its predictability remained...
Abstract Using a fully coupled global ocean–atmosphere general circulation model assimilating only sea surface temperature, the authors found for first time that several El Niño–Southern Oscillation (ENSO) events over past two decades can be predicted at lead times of up to 2 yr. The Niño condition in 1997/98 winter some extent about 1½-yr but with weak intensity and large phase delay prediction onset this exceptionally strong event. This is attributed influence active intensive stochastic...