Data management: Data sources & Quality control. Sea level measurements.

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Presentation transcript:

Data management: Data sources & Quality control

Sea level measurements

Absolute sea level Src: Per Knudsen

Measurement system Src: JPL

Satellite laser ranging Src: Schrama

TOPEX/Poseidon Groundtrack Src: Schrama

History Satellite YearsOrganisationAccuracy SKYLAB1972 NASA20 m GEOS NASA3 m SEASAT1978 NASA2 m GEOSAT US Navy30 cm ERS ESA4-10 cm ERS ESA4 cm T/P NASA/CNES2.. 3 cm GFO US Navy2.. 5 cm ENVISAT ESA2.. 3 cm JASON NASA/CNES2.. 3 cm JASON NASA/CNES2.. 3 cm

Corrections applied Orbit Mean Sea Surface (MSS) Dry troposphere Wet troposphere (composite*) Ionosphere Sea State Bias Ocean tide and loading tide Solid Earth tide Pole tide Combined atmospheric correction Specific corrections (per satellite) Src:

Envisat: specific corrections Src: cls.dot

Data Trends maps - public Along-track – restricted Real-time - restricted

Relative sea level Src: Peter L Johnson new old Fort Denison in Sydney, Australia

Different gauges Src: ioc manual Bubbler pressure gauge Still well gauge Next-Generation Water Level Measurement System

Radar tide gauge

Bottom Pressure Gauge Src: Aarup

Datasets Monthly, Annual: Permanent Service for Mean Sea Level (PSMSL) GLOSS Delayed Mode Higher Frequency (DM HF) Data Sets: British Oceanographic Data Centre (BODC), University of Hawaii Sea Level Center (UHSLC) GLOSS Fast Mode Higher Frequency Data Sets University of Hawaii Sea Level Center (UHSLC) Status: IOC-Sea-level Station Monitoring Facility

PSMSL stations

Censoring effect

Bathymetry

Global bathymetry Src: gebco

Measuring coastal bathymetry

Single beam measurement

Bathymetry Src: openearth

Synthetic Aperture Radar spaceoffice.nl

Flight tracks

Nearshore Bathymetry/Topography