DBCP issues for OOPC

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DBCP issues for OOPC

• Boram Lee
• IOC Secretariat for JCOMM

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• Requirement on SST Measurement
• Requirement on Wave Measurement
• Any other issue(s)

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Requirement on SST Measurement

• DBCP Data Users and Technology Workshop (27-28
  March 2006, Reading)
• Requirements expressed for drifter SST
• Predicting AT, RH, through satellite SST and wind
• SST analysis (e.g. Reynolds) for NWP and
  ocean/climate modelling
• GHRSST Resolving the SST Diurnal Cycle globally,
  seasonally in extreme events.
• Workshop agreed that this was feasible and asked
  DBCP to proceed
• DBCP-22 asked OOPC to provide detailed rationale
  and documentation for this requirement

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Requirement on SST Measurement

• Timeliness (driven by NWP requirements)
• better Argos network of local receiving stations,
  
• use of Argos multi-satellite service, and
• use of other satellite data telecommunications
  systems (e.g. Iridium)
• Resolution provide for hourly data, at the
  hour
• Quality
• existing quality information monitoring
  activities and feed back mechanisms (e.g. buoy QC
  guidelines)
• Advertise known quality of buoy data in order to
  build confidence
• Quantity
• Increase deployments or deployment strategies in
  certain regions ? Capacity Building, Coordinate
  with GOOS Regional Alliance

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Requirement on SST Measurement
SST High resolution hourly data required for
diurnal cycle resolution
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Requirement on SST Measurement

• Issues hourly data, at the hour
• Stable clock adds cost
• e.g., controller with Temp Compensated Crystal
  Oscillator, 1 min/yr at 040ºC.
• GPS adds cost but
• provides additional location, accuracy, frequency
• Argos does not provide for real-time hourly
  reports
• What is an hourly SST value? Instantaneous
  value at top of hour, average over surrounding 15
  minutes, or 60 minutes?

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Requirement on SST Measurement
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Requirement on SST Measurement

• Recommendations to OOPC
• Precise statement of OOPC requirements needed to
  ascertain whether/what new technological
  developments are required
• real time requirements
• clarification of the definition of hourly SST
  value
• sampling period
• averaging period
• averaging period ending on the hour or centred on
  the hour
• timing accuracy, etc.
• advise on technical solutions (adding a
  temperature compensated crystal oscillator (TCXO)
  or using GPS)
• The DBCP Evaluation Group will look at practical
  technical solutions in more detail and work on
  cost impacts once the requirements became
  available.

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Requirement on enhanced high-quality, long-term
wave measurements

• Needs for
• Ocean wave climatology and variability
• Air-sea interaction
• Assimilation into offshore wave forecast models
• Validation of wave forecast models
• Calibration / validation of satellite wave
  sensors.
• The primary requirement additional wave
  measurements
• Comprising (at a minimum) significant wave
  height, peak period and 1-D spectra, hourly in
  real-time, for assimilation into coupled
  atmosphere-ocean wave models for real-time
  forecasting activities, and subsequent
  verification

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Requirement on enhanced high-quality, long-term
wave measurements

• Currently, the vast majority of existing wave
  measurements were made in the coastal margins of
  North America and western Europe, with a huge
  data void in most of the rest of the global
  ocean, particularly in the southern ocean and the
  tropics.
• Non-moored wave observations

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Requirement on enhanced high-quality, long-term
wave measurements

• DBCP-22 (October 2006, La Jolla)
• recommend adding wave measurements to the DBCP
  Implementation Strategy
• invite buoy operators and Panel Members to
  increase wave measurements, particularly from
  open ocean areas, in the Southern Ocean, and the
  tropics
• invite the DBCP Evaluation Group to address wave
  measurement technology issues and to communicate
  with the ETWS and OOPC on user requirements
• recommend JCOMM/OCG to address the broader issues
  in terms of technological development and
  implementation, including wave measurements from
  Ocean Sites, Argo, drifters, Triton/TAO/PIRATA
  and shipboard systems
• urge the ETWS to work with the JCOMM OPA to put
  forward a more detailed set of requirements for
  additional high-quality wave measurements

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Requirement on enhanced high-quality, long-term
wave measurements

• ETWS draft of the table
• Requirements for surface wave observations
  http//www.jcomm-services.org/ETWS-Observation-Req
  uirements.html
• Advice/Comments ?

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Other Issue(s)

• What new variables might in due course be
• usefully implemented on data buoys (e.g. pCO2) ?

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DBCP status