MI oceanographic data

Transcription

1 Marine Institute Oceanographic Data SMARTSkills 2013 Postgraduate Workshop Galway, Oct 2013 Kieran Lyons MI oceanographic data Measured Operational metocean time series (weather and wave buoys) Operational sea level time series (tide gauges) CTD Vessel underway Ad-hoc data series (project-based) (e.g. ADCP, T&S) Modelled/Predicted Predicted tidal water level and currents (tide gauges and model nodes) Modelled temperature, salinity, currents Modelled wave parameters

2 Measured Data access Direct access via data.marine.ie Data Request service Modelled/Predicted Direct access to some recent data via THREDDS (netcdf) - ERDDAP - Data Request service ERRDAP Powerful data server (developed by NOAA) Interrogate, view and download data in a number of common formats Automated downloads possible Especially useful for modelled data (removes need to handle netcdf)

3 Tools for data analysis Matlab Built for data analysis Lots of pre-cooked scripts on the web Not cheap! Octave (open source Matlab) R Python ArcGIS SQL Server (SQL) Fortran (for masochists!) Weather Buoy network Time series begins in 2001 (M1) Last buoy (M6) deployed in 2006 Weather parameters (e.g. atm. pressure, wind speed & direction, Anomaly (from time series mean pre-2012) air temperature) Oceanographic parameters (water temperature, wave height and period) New FUGRO buoys return extra wave parameters since 2011 (e.g. mean wave direction, peak period, max wave height) Seasonal trends, climate studies Met model assimilation

4 Spectral wave buoys Spectral wave data amplitude/variance over a range frequencies directional buoys also provide wave direction at frequencies FUGRO weather buoys measure spectral wave data Datawell Waveriders deployed at 3 other locations (Spiddal & Belmullet) to support research into wave energy Data since 2008 (Spiddal) Waveriders occasionally deployed at other sites for short periods (project-specific) Wave climate studies Wave model tuning/validation Wave data examples Model Validation Distribution of peak direction Joint distribution (Hs/Tz) plots 1-D spectrum time series A picture of how energy varies across the spectrum over time

5 Tide gauge network Gauges located around the coast of Ireland (water level relative to OD Malin) Operational since 2006 Tide predictions based on harmonic analysis of gauge data Tide predictions available via web (up to 2 years in the future) Predictions for any point in time available on request Underway and CTD data Vessel underway data recorded since 1994 Parameters include temperature, salinity, water depth, met parameters High density of data on regular cruise tracks CTD archive from 1999 T&S; occasionally oyxgen, fluor Data submitted to ICES archive at end of every year Inter-annual variability Annual and seasonal climatologies for the Irish shelf

6 Objective analysis Annual surface temperature: OA using underway and CTD data Other Measured Data Ad-hoc deployments of sensors usually for a relatively short time period (months) Data not systematically managed at the moment EXAMPLES Acoustic Doppler Current Profiler (ADCP): measure whole water column currents Very important for model validation T&S measurements using high precision Seabird sensors

7 Emerging time series M6 Temperature variability in 2012 M6 high precision T&S Chain of microcats (SBE37) on mooring line since May 2008 Nominal depths at 250, 500, 750, 1000m but persistent knockdowns mean the instruments effectively measure over a range of depths (e.g at the 1000 ) Interannual deep water mass variability Climate monitoring Marine Institute Modelling - Background Ocean modelling in MI began in Spring 2004 Open-source Fortran-based models (ROMS, SWAN) EU projects used to gain experience and expertise ECOOP Project (FP6) began Feb 2007 Followed by EASYCO, ARCOPOL, ASIMUTH 560-core HPC purchased June 2008 Model data archived Netcdf or.mat format Mostly on tape

8 Operational ROMS modelling ROMS model of northeast Atlantic km horizontal resolution 40 vertical levels 36,000,000 grid cells T, S, SSH, velocity Daily 3-day forecast Weekly 7-day hindcast Data published to Thredds/FTP and web Hindcast data archived (LTO4) (begins in early 2010) Child models at 250m res. for Bantry Bay and Galway Bay Hindcast data archived Operational wave modelling Wave modelling using SWAN (Simulating Waves Nearshore) Domain covering Irish waters degree resolution 6-day forecast every day Most recent 30 days of data available via ERDDAP Hindcast data archived online Data archive begins in 2011

9 Model Data Climatologies/seasonal means Winter Bottom Stress Model Data Winter Bottom Temperature 17 Simulated transport of Nephrops larvae using model velocities Animation created with 18 Eonfusion

10 Wave exposure Seabed kinetic energy due to wave action (an indication of wave exposure) Useful for habitat mapping, etc Wave forecasts at buoy locations Site maintenance planning Potential for use at wave energy sites (wave power forecasts)

11 Tide predictions for Irish shelf ROMS models include tidal forcing Tidal harmonics for water level and current have been generated at every model grid point Tidal water level and current predictions can be generated for every model grid point Caveat: lack of validation (esp. for currents) Conclusions Tidal stream atlas (ongoing research) Lots of data for everyone!