VARUNAIndian Ocean Digital Twin
Live · INCOIS-GODAS-IO Dataset

A Digital Twin of the Indian Ocean.

Explore, understand and analyze the ocean in four dimensions — depth, space, time and data. Model forecasts fused with live Argo, glider and in-situ observations, rendered natively in your browser.

Explore the OceanSee How It Works
Scroll to dive
ARGO 2901623 · 12.4°N 68.1°E · PROFILE RECEIVEDSST +1.2σ ANOMALY · CENTRAL ARABIAN SEAGLIDER SG-114 · TRANSECT 84% COMPLETEBAY OF BENGAL · MIXED LAYER 42 mHF RADAR · SURFACE CURRENT 1.9 m/sCTD CAST 0447 · 1,860 m · O₂ MINIMUM DETECTEDEQUATORIAL IO · THERMOCLINE SHOALINGBGC FLOAT · CHL-a 0.31 mg/m³ARGO 2901623 · 12.4°N 68.1°E · PROFILE RECEIVEDSST +1.2σ ANOMALY · CENTRAL ARABIAN SEAGLIDER SG-114 · TRANSECT 84% COMPLETEBAY OF BENGAL · MIXED LAYER 42 mHF RADAR · SURFACE CURRENT 1.9 m/sCTD CAST 0447 · 1,860 m · O₂ MINIMUM DETECTEDEQUATORIAL IO · THERMOCLINE SHOALINGBGC FLOAT · CHL-a 0.31 mg/m³
01The Problem

The ocean is data-rich.
Understanding it is hard.

Every day, supercomputers, satellites and thousands of autonomous instruments generate terabytes of ocean data across depth, space, time and dozens of variables. Locked inside NetCDF files and specialist tools, it stays invisible to nearly everyone who needs it.

VARUNA makes that data visible — turning the four-dimensional state of the Indian Ocean into something you can see, move through and question directly.

4D
Depth · Space · Time · Variables
40
Vertical z-levels resolved
1,847
Live Argo floats ingested
7+
Fused observation networks
02The Explorer

One ocean. Multiple data sources.
One interactive view.

A browser-native workspace where model fields and real observations share a single, navigable 4D scene. Try the controls below.

dataset · INCOIS-GODAS-IO
slice · point
Temperature
38–112°E · 28°S–30°N
2 m · Epipelagic
26.7°C
Argo floatGliderCTD / mooring
Temperature°C
2.016.531.0
24–28 AUG 2026
JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC
03Capabilities

One scene. Every question.

Volumetric temperature rendering of the Indian OceanSee it live
VOLUME

Volumetric rendering

The full 3D temperature, salinity or oxygen field as a translucent volume — thermocline, OMZ cores and eddies readable at a glance, evaluated per-pixel on the GPU.

20 degree Celsius isosurface extracted by marching cubesSee it live
SLICE · ISOSURF

Depth slices & isosurfaces

Sweep 40 stretched z-levels or extract the 20 °C isosurface live via marching cubes — the classic thermocline-topography proxy, reshaped as you scrub time.

Argo floats, gliders and moorings over model bathymetrySee it live
OBSERVATIONS

Argo · gliders · moorings

Click any platform for its T/S profile, drift track on real bathymetry, and an obs-vs-model misfit panel with RMSE and bias — validation forecasters currently assemble by hand.

Vertical section curtain through the ocean volumeSee it live
TRANSECT · AREA

Transect & area analysis

Draw any A→B line: a GPU curtain follows it in 3D while a 2D section chart tracks your hover. Drag a box for regional statistics, histograms and annual cycles. Everything exports to CSV.

Real IBTrACS cyclone tracks with TCHP overlaySee it live
HAZARDS · TCHP

Hazards & TCHP

Seven real IBTrACS cyclone tracks in IMD category colors, a forecast cone demo, Tropical Cyclone Heat Potential overlay, and a five-type advisory engine for the current pentad.

Signature · Dive the water column

SURFACE

Depth
2 m
Zone
Epipelagic
Temp
28.4°C

Sunlit, wind-mixed, warm.

SURFACE2 m
50 m50 m
500 m500 m
2,000 m2,000 m
DEEP OCEAN4,000 m

Scroll to descend. Temperature, salinity and currents transform continuously through the full water column.

04Analysis Toolkit

Built for scientific analysis, not just viewing.

VOLUME01

3D Volumetric Fields

Explore any variable through the full water column as a continuous, navigable volume.

SLICE02

Depth Slices

Move vertically through 40 z-levels and inspect how conditions change with depth.

ISOSURF03

Isosurfaces

Render surfaces of constant value to reveal hidden thermal and density structures.

VECTORS04

Current Vectors

Visualize the three-dimensional movement of water with streamlines and particles.

TIME05

Time Animation

Travel through ocean conditions across days, seasons and years of model output.

OBS06

Observation Overlays

Drop real Argo, glider and CTD observations directly onto the model field.

PROFILE07

Interactive Profiles

Click any float or glider to inspect its vertical profile and full time history.

COLORMAP08

Custom Color Mapping

Tune ranges, opacity and scientific colormaps for precise visual analysis.

05Operational Impact

From raw ocean data to faster decisions.

Bathymetric map of the Indian Ocean showing India, the Arabian Sea and the Bay of Bengal
Marine heat anomaly· Central Arabian SeaELEVATED
Strong current shear· Bay of BengalWATCH
Model–obs mismatch· Equatorial IOREVIEW
01

Disaster Management

Track cyclone-driven ocean response and storm-surge precursors.

02

Search & Rescue

Forecast surface drift to focus operations on high-probability zones.

03

Marine Forecasting

Deliver depth-resolved state estimates for shipping and offshore work.

04

Fisheries

Locate thermal fronts and productivity that concentrate marine life.

05

Climate Monitoring

Watch heat content, anomalies and long-term basin-scale change.

06Architecture

Standards-based. Browser-native. Scalable.

01DATA
  • NetCDF
  • CF Conventions
  • Zarr
  • OPeNDAP
02PROCESSING
  • Regridding
  • Tiling
  • Aggregation
  • Anomaly engine
03API
  • OGC WMS / WCS
  • REST
  • Tile server
  • Time queries
04VISUALIZATION
  • WebGL
  • Three.js
  • Cesium
  • GPU shaders
05ANALYSIS
  • Point / Transect
  • Area stats
  • Profiles
  • Export