Applications from GODAE to Navies throughout the world

1
Applications from GODAE to Navies throughout the
world
Robert Woodham Royal Australian Navy Didier
Jourdan Centre Militaire d'Océanographie Jez
Braithwaite Fleet Weather and Oceanography Centre4
HMAS Dechaineux
Charles de Gaulle
USS Virginia
HMS Ark Royal
2
Do we observe the mesoscale, and for what purpose?
Operational Implementations
Systems are implemented within operational
centers throughout the globe with high resolution
nests UK Met office Forecasting Ocean
Assimilation Model (FOAM) Naval Oceanographic
Office (NCOM HYCOM) BLUElink system Ocean
Forecasting Australia Model (OFAM) Service
Hydrographique et Oceanographique de la Marine
(SHOM) Système Opérationnel dAnalyse et
Prévision (SOAP)
3
Do we observe the mesoscale, and for what purpose?
Acoustic Applications
Predicting temperature and salinity variations
are necessary to predicting sound speed Sound
speed gradients control refraction of acoustic
energy within the ocean Acoustically relevant
features change on time scales of hours and on
spatial scales of fronts Knowing how energy will
propagate through the water is essential in good
planning
4
Need for Data and Models
dB loss
dB loss
dB loss
dB loss
dB loss
dB loss
5
Ocean State from Operational Systems

• Model outputs
• Temperature, Salinity and
• Sound velocity Maps
• Observed/forecasted
• bathythermic profiles

Acoustic situation
6
Derived Information

• Data analysis
• Ocean conditions
• Mixed layer depth,
• Med waters
• Ducts conditions
• Sonic layer, min velocity,
• Ambient noise
• Geometrical acoustic products
• DZC, LZC

Acoustic situation
7
System Performance now Enabled

• Data Fusion
• Energetic, acoustic products
• loss, signal excess
• TDA products
• SLD exploitability
• Bottom reflexion exploitability
• Sunny afternoon effect

Sonar capability
8
Knowledgeable Guidance from Performance

• Human expertise
• Mesoscale activity
• Thermal fronts

Acoustic stealthiness
N-W Atlantic domain 20-60N / 40-60W
N-E Atlantic domain 20-60N / 0-40W
9
Velocity Predictions
Predicting currents is critical for tracking
drifting objects and operations throughout the
water column A combination of geostrophic flow at
long time scales, tides at diurnal scales and
surface wind stress combined with a complex drag
profile results in the requirement of model
prediction of 3D velocities
Graphic shows East Australian Exercise Area SST
and surface currents
10
Queuing Resources for Efficiency

• Model outputs
• U, V maps
• Lagrangian trajectories
• Terms
• 0 to 72 H

Object or pollutant drifting
11
10-day Hindcast Backtrack from 10 JAN 07 (red
dots) to 31 DEC 06 (green dots)
Search Determination
Pinger Locations
Suggest wreck location
NTSB last radar contact
(U) Two pingers were found in the middle of the
Makassar Strait.

• (U) The field is seeded with a series of END
  locations on 10 JAN 07 (red dots)
• (U) and run backwards in time to START on 31 DEC
  06 (green dots).

First wreckage found
Indonesian airline Flight 574
UNCLASSIFIED
12
Do we observe the mesoscale, and for what purpose?
Underwater Currents
BLUElink data used to forecast sub-surface
currents at 60m (left) and 130m (right) for a
highly successful submarine bottoming activity
during a multi-national exercise
13
Do we observe the mesoscale, and for what purpose?
Nearshore Environment
Forecast wave environment Critical for small
craft and personnel in the water Requires nesting
high resolution wave systems into global
14
Wave assimilation example
Assimilation of Observations into Models
Altimeter SWH Observations
Analyzed Increment SWH (M)
Wave Watch III Forecast SWH (M)
Corrected Model SWH (M)
15
Nesting into Smaller Domains
Wave Height
Depth
Currents
16
Diver Operation Safety
BLUElink current forecasts used to assess
suitability for diving operations
SST and currents
Traffic-light presentation
17
Do we observe the mesoscale, and for what purpose?
Nested Models and Atmospheric Effects
Relocatable Ocean-Atmosphere Model (ROAM) nests
inside the BLUElink global model
ROAM is relocatable within the red box
ROAM control system presents a simple interface
to RAN forecasters
18
Do we observe the mesoscale, and for what purpose?
Evaporative Duct / Radar Performance
Radar performance prediction - evaporation duct
height calculated using BLUElink SST and NWP
19
Amor/Anti-Armor and CWO Return on Investment
Payoff
Return on investment computed by DoD High
Performance Computing Modernization Office in
Climate-Weather-Ocean
,
20
Applications from GODAE to Navies throughout the
world

• Challenges
• Accuracy
• How accurate are mesoscale features (intensity,
  position) relative to applications?
• Next level of features
• Additional physical features are as important as
  those being addressed

21
Applications from GODAE to Navies throughout the
world
Questions?
22
FIN
23
Applications from GODAE to Navies throughout the
world