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 Years Organisation Accuracy

SKYLAB 1972 NASA 20 m

GEOS-3 1975-1978 NASA 3 m

SEASAT 1978 NASA 2 m

GEOSAT 1985-1990 US Navy 30 cm

ERS-1 1991-1996 ESA 4-10 cm

ERS-2 1995-2006 ESA 4 cm

T/P 1992-2005 NASA/CNES 2 .. 3 cm

GFO 2000-2008 US Navy 2 .. 5 cm

ENVISAT 2002-2012 ESA 2 .. 3 cm

JASON-1 2001- NASA/CNES 2 .. 3 cm

JASON-2 2008- NASA/CNES 2 .. 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: http://www.aviso.oceanobs.com/

Envisat: specific corrections

Src: cls.dot

Data

http://www.aviso.oceanobs.com

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 gaugeNext-Generation Water Level MeasurementSystem

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