A5101808615- Oceanographic and Atmospheric Processes
- Climate variability and models
- Geological and Geophysical Studies
- Marine and coastal ecosystems
- Arctic and Antarctic ice dynamics
- Tropical and Extratropical Cyclones Research
- Ocean Waves and Remote Sensing
- Methane Hydrates and Related Phenomena
- Geophysics and Gravity Measurements
- Meteorological Phenomena and Simulations
- Marine and fisheries research
- Underwater Vehicles and Communication Systems
- Underwater Acoustics Research
- Ocean Acidification Effects and Responses
- Maritime Navigation and Safety
- Coral and Marine Ecosystems Studies
- Water Quality Monitoring Technologies
- Ionosphere and magnetosphere dynamics
- Marine Biology and Ecology Research
- Big Data and Business Intelligence
- Marine Bivalve and Aquaculture Studies
- Magnetic Field Sensors Techniques
- Advanced Computational Techniques and Applications
- International Maritime Law Issues
- Coastal and Marine Dynamics
Japan Agency for Marine-Earth Science and Technology
2013-2022
Center for Global Development
2016-2019
The University of Tokyo
2008
First Institute of Oceanography
2008
NOAA Pacific Marine Environmental Laboratory
2008
University of Tasmania
2008
National Institute of Oceanography
2008
Indian National Centre for Ocean Information Services
2008
Institut de Recherche pour le Développement
2008
Woods Hole Oceanographic Institution
2008
The Indian Ocean is unique among the three tropical ocean basins in that it blocked at 25°N by Asian landmass. Seasonal heating and cooling of land sets stage for dramatic monsoon wind reversals, strong ocean-atmosphere interactions, intense seasonal rains over subcontinent, Southeast Asia, East Africa, Australia. Recurrence these critical to agricultural production supports a third world's population. also remotely influences evolution El Nino-Southern Oscillation (ENSO), North Atlantic...
In the past two decades, Argo Program has collected, processed and distributed over million vertical profiles of temperature salinity from upper kilometers global ocean. A similar number subsurface velocity observations near 1000 dbar have also been collected. This paper recounts history Program, its aspiration arising out World Ocean Circulation Experiment, to development implementation instrumentation telecommunication systems, various technical problems encountered. We describe data...
Marine heatwaves (MHWs), which are discrete extreme oceanic warming events, have important impacts on the marine ecosystem, fishery resources, and social economy. Previous studies based sea surface temperature suggest that MHWs in tropical western Pacific Ocean very weak. However, here we show observed by Tropical Atmosphere Ocean/Triangle Trans-Ocean Buoy Network buoys unexpectedly strong subsurface layer (50–300 m depth). The ensemble mean intensity of shows a peak about 5.2 °C at 150 m,...
The purpose of this study is to examine the variation ocean surface layer hydrography on interannual timescales in tropical Pacific Ocean using conductivity‐temperature‐depth measurements from 1976 1994. We demonstrate that associated with variations atmospheric forcing, there were distinct changes mixed temperature, salinity, depth, and barrier thickness between normal, El Niño, La Niña time periods. During Niño a warm, fresh accompanied by an underlying develops central eastern association...
Recent theory suggests that ocean‐atmosphere interactions in the western Pacific warm pool are of fundamental importance to interannual variations associated with El Niño and Southern Oscillation (ENSO). The encompasses highest mean sea surface temperatures (SSTs) world ocean, intense atmospheric deep convection heavy rainfall, formation thick salt‐stratified barrier layers help sustain high SSTs. This study shows eastern edge is characterized by a strong zonal salinity front throughout...
The Mirai Indian Ocean cruise for the Study of Madden-Julian oscillation (MJO)-convection Onset (MISMO) was a field experiment that took place in central equatorial during October–December 2006, using research vessel Mirai, moored buoy array, and landbased sites at Maldive Islands. aim MISMO to capture atmospheric oceanic features when convection MJO initiated. This article describes details as well some selected early results. Intensive observations Doppler radar, radiosonde, surface...
To understand the coastal upwelling system along southern coast of Java, we investigated ocean temperature and salinity obtained from an Argo float. In 2008, a positive Indian Ocean Dipole (IOD) event began to develop in early May anomalously cool SST developed around south Java September. During peak IOD, float successfully observed vertical structure within 90 km Java. The two intraseasonal-scale cooling events July August, with significant upward movements thermocline more than m....
Abstract The temperature and conductivity drift (time change of the characteristics) moored SBE37IM (CT) sensors was investigated by pre- postdeployment calibration Triangle TransOcean Buoy Network (TRITON). This buoy network comprises western portion basinwide (Tropical Atmosphere Ocean) TAO/TRITON array, which monitors phenomena such as El Niño contributes to forecasting climate change. Over time deployment very small, within 3 mK data. more significant. After 1 yr mooring, observed in...
Northwestern Java and Makassar rainfall variations are examined in relation to the tropical air-sea coupled phenomena referred as Indian Ocean Dipole (IOD) El Nino- Southern Oscillation (ENSO) using retrospective forecasts known SINTEX-F. The model predicts its variability realistically September-November (SON) general successfully interannual variation of northwestern up 3 months ahead 6 ahead. This indicates potential societal benefits predictability Indonesia. Simple correlation analysis...
Warm sea surface temperature (SST) anomalies of more than 1 °C occurred in the southeastern tropical Indian Ocean and peaked during August to October 2010. The anomalous SST warming was associated with negative phase dipole (IOD) phenomenon. In this study, observational data from a moored buoy were used together satellite atmospheric reanalysis sets clarify processes that produced anomalously warm We focused on location 5°S, 95°E where situ measurements 10 years by available. observations...
The characteristics of the convergence zone at eastern edge equatorial Pacific warm pool are studied using a compilation in‐situ current and salinity measurements during period 1992–2001. displacement is observed, for first time, as far west 140°E in western Pacific, mainly La Niña periods, near 140°W central 1997–98 El Niño. may be associated with front dividing fresh waters from salty upwelled Pacific. Despite zonal ranging over about one fifth circumference earth, main parameters involved...
Through the Cooperative Study of Kuroshio and Adjacent Regions (CSK) program during 1965–1979, capacities current member states (MSs) Sub-Commission for Western Pacific (WESTPAC) Intergovernmental Oceanographic Commission (IOC) were enhanced with regard to regional ocean science data management. Following termination CSK in 1979, each MS continued work advance science. The results scientific studies its adjacent regions have been published by various experts including many from MSs WESTPAC;...
Table S1A.(top) Autonomous Temperature Line Acquisition System (ATLAS) mooring meteorological and (bottom) oceanographic sensor specifications.Accuracies listed are based on predeployment postrecovery calibrations for groups of sensors, supplied by the manufacturer (indicated *), or, in case SonTek current meter, intercomparisons acoustic Doppler profiler data known accuracy.Except ranges over which instruments calibrated (tuned tropics) rather than full range possible measurements.Data...
Abstract Upper-ocean salinity variation in the tropical Pacific is investigated during 2000s, when Triangle Trans-Ocean Buoy Network (TRITON) buoys and Argo floats were deployed more data observed than previous periods. This study focuses on upper-ocean variability warming period of El Niño–Southern Oscillation (ENSO)-like quasi-decadal (QD)-scale sea surface temperature anomalies over central equatorial (January 2002–December 2005; hereafter “warm QD phase”). It shown that strong negative...
Observations from moored subsurface acoustic Doppler current profilers (ADCPs) have revealed the structure of cross‐equatorial meridional currents in eastern equatorial Indian Ocean. Using observational data longer than 8 years, we present observations seasonal and interannual variation 2000s. In line with earlier numerical simulations, there were significant that displayed variation. The annual mean condition was dominated by during boreal summer monsoon which Ekman transports are southward...
Rainfall variability over Indonesia and its relation to El Niño – Southern Oscillation (ENSO) the Indian Ocean Dipole (IOD) events were investigated using Japanese 25-year reanalysis/Japan Meteorological Agency (JMA) Climate Data Assimilation System (JRA-25/ JCDAS). The JRA-25 data consistently depicts seasonal variation of Indonesian rainfall with a wet season that peaks at December-January dry in July-August when convection belt moved northward. Composite analysis rainfall, sea surface...
Abstract Sea level variations along the coasts of Sumatra and Java were investigated to determine coastal upwelling signal that is linked local sea surface temperature (SST) variability. We used Indonesian tidal station data together with satellite SST atmospheric reanalysis data. The southern coast have a significant coherence remote wind, variations, an intraseasonal time scale 20–50 days. Assuming would appear as drop (SLD), we focused on intraseasonal‐scale SLD events in Significant...
A better understanding of variability in the volume warm water equatorial Pacific pycnocline (warm volume, or WWV) is critical to El Niño‐Southern Oscillation (ENSO) variability. We have investigated meridional WWV transport Northern (NH) and Southern Hemispheres (SH) using a high‐resolution general circulation model. The western boundary region compensates interior SH, where Sverdrup balance holds approximately. In contrast, such compensation does not hold NH, because lags by about 7...
Impacts of TAO/TRITON (TT) and Argo data in the tropical Pacific on accuracy temperature salinity fields generated by a data-assimilation system for operational seasonal forecasts are examined through series observing experiments. This study demonstrates positive impacts both TT data, that these observation types complementary to each other. Data assimilation has relatively large around thermocline NINO3 region far western equatorial Pacific. A close relationship between oceanic inherent...