Reconstructed Sea Level Version 1

Reconstructed Sea Level Version 1
SHARE THIS PAGE
Please contact us if there are any discrepancies or inaccuracies found below.
DOI10.5067/RECSL-000V1
Short NameRECON_SEA_LEVEL_OST_L4_V1
DescriptionThe Reconstructed Sea Level dataset contains sea level anomalies derived from satellite altimetry and tide gauges. The satellite altimetric record provides accurate measurements of sea level with near-global coverage, but it has a relatively short time span, since 1993. Tide gauges have measured sea level over the last 200 years, with some records extending back to 1807, but they only provide regional coverage, not global. Combining satellite altimetry with tide gauges, using a technique known as sea level reconstruction, results in a dataset with the record length of the tide gauges and the near-global coverage of satellite altimetry. Cyclostationary empirical orthogonal functions (CSEOFs), derived from satellite altimetry, are combined with historical sea level measurements from tide gauges to create the Reconstructed Sea Level dataset spanning from 1950 through 2009. Combining the altimetric and tide gauge records alleviates the difficulties caused by the short record length and poor spatial distribution of the satellite altimetry and tide gauges, respectively. Previous sea level reconstructions have utilized empirical orthogonal functions (EOFs) as basis functions, but by using CSEOFs and by addressing other aspects of the reconstruction procedure, an alternative sea level reconstruction can be computed. The resulting reconstructed sea level dataset has weekly temporal resolution and half-degree spatial resolution. For specific information on the algorithm and how the CSEOFs are applied to the tide gauge data please see Hamlington et al. 2011.
Version1
Dataset TypePREVIEW
MeasurementOceans > Sea Surface Topography > Sea Surface Height
Processing Level4
CoverageRegion: Global
Northernmost Latitude: 90 degrees
Southernmost Latitude: -90 degrees
Westernmost Longitude: 0 degrees
Easternmost Longitude: 360 degrees
Time Span: 1950-Jun-16 to 2009-Jun-27
ResolutionSpatial Resolution: 0.5 degrees (Latitude) x 0.5 degrees (Longitude)
Temporal Resolution: 7 Day
ProjectionType:
Detail:
Ellipsoid:
Latency hours
Platform/Sensor
JASON-1
Platform
Name: JASON-1 (JASON-1)
Orbit Period: 112.43 minutes
Inclination Angle: 66.04 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
POSEIDON-2
SENSOR
Name: JASON-1 RADAR ALTIMETER (POSEIDON-2)
Swath Width: - km
Description: The Poseidon-2 altimeter, operating at 13.575 GHz (Ku band) and 5.3 GHz (C band), is the primary sensor for the JASON-1 mission. The measurements made at the two frequencies are combined to obtain measurements of the altimeter range, wind speed, significant wave height, and the ionospheric correction. The Poseidon-2 package consists of dual redundant altimeter units each of which has low mass and low power consumption.

JASON-1
Platform
Name: JASON-1 (JASON-1)
Orbit Period: 112.43 minutes
Inclination Angle: 66.04 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
JMR
SENSOR
Name: JASON-1 MICROWAVE RADIOMETER (JMR)
Swath Width: - km
Description: The JMR mreasures teh sea surface microwave brightness temperatures at three frequencies (18.7 GHz, 23.8 GHz and 34.0 GHz) to provide the total water vapor content in the troposphere along the altimeter beam. The 23.8 GHz channel is the primary channel for water-vapor measurement and is a redundant channel on the JMR. The 18.7 GHz channel provides a correction for wind-induced effects in the sea surface background emissions, and the 34.0 GHz channel provides a correction for cloud liquid water. The measurements are combined to obtain the error in the satellite range measurements caused by pulse delay due to the water vapor.

TOPEX/POSEIDON
Platform
Name: Topography Experiment/Poseidon (TOPEX/POSEIDON)
Orbit Period: 112.43 minutes
Inclination Angle: 66.04 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
POSEIDON ALTIMETER
SENSOR
Name: POSEIDON ALTIMETER (POSEIDON ALTIMETER)
Swath Width: 5 km
Description: A satellite altimeter consists of a transmitter that sends out very sharp pulses, a sensitive receiver to record the pulse after it is reflected from the sea surface, and an accurate clock to note the time interval between transmission and reception. Examples of satellite altimeters used in the remote sensing of ocean surface height, wave height and wind speed are Seasat, Geosat and Topex/Poseidon.

TOPEX/POSEIDON
Platform
Name: Topography Experiment/Poseidon (TOPEX/POSEIDON)
Orbit Period: 112.43 minutes
Inclination Angle: 66.04 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
TOPEX MICROWAVE RADIOMETER
SENSOR
Name: TOPEX MICROWAVE RADIOMETER (TOPEX MICROWAVE RADIOMETER)
Swath Width: 5 km
Description: The TMR measures the sea surface microwave brightness temperatures at three frequencies (18 GHz, 21 GHz and 37 GHz) to provide the total water-vapor content in the troposphere along the altimeter beam. The 21 GHz channel is the primary channel for water-vapor measurement. It is redundant (21A and 21B). The 18 GHz and 37 GHz channels are used to remove the effects of wind speed and cloud cover, respectively in the water-vapor measurement. TMR data are sent to CNES for processing along with their altimeter data. The measurements are combined to obtain the error in the satellite range measurements caused by pulse delay due to the water vapor.

OSTM/Jason-2
Platform
Name: Ocean Surface Topography Mission/Jason-2 (OSTM/Jason-2)
Orbit Period: 112.43 minutes
Inclination Angle: 66.04 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
POSEIDON-3
SENSOR
Name: OSTM/Jason-2 RADAR alitmieter (POSEIDON-3)
Swath Width: 5.1 km
Description: The Poseidon-3 altimeter, operating at 13.575 GHz (Ku band) and 5.3 GHz (C band), is the primary sensor for the OSTM mission. The measurements made at the two frequencies are combined to obtain measurements of the altimeter range, wind speed, significant wave height, and the ionoshperic correction. The Poseidon-3 package consists of dual redundant altimeter units each of which has low mass and low power consumption.

OSTM/Jason-2
Platform
Name: Ocean Surface Topography Mission/Jason-2 (OSTM/Jason-2)
Orbit Period: 112.43 minutes
Inclination Angle: 66.04 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
AMR
SENSOR
Name: Advanced Microwave Radiometer (AMR)
Swath Width: - km
Description: -

Jason-1 Geodetic
Platform
Name: Jason-1 Geodetic (Jason-1 Geodetic)
Orbit Period: 99999 minutes
Inclination Angle: 66.15 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
POSEIDON-2
SENSOR
Name: JASON-1 RADAR ALTIMETER (POSEIDON-2)
Swath Width: - km
Description: The Poseidon-2 altimeter, operating at 13.575 GHz (Ku band) and 5.3 GHz (C band), is the primary sensor for the JASON-1 mission. The measurements made at the two frequencies are combined to obtain measurements of the altimeter range, wind speed, significant wave height, and the ionospheric correction. The Poseidon-2 package consists of dual redundant altimeter units each of which has low mass and low power consumption.

Jason-1 Geodetic
Platform
Name: Jason-1 Geodetic (Jason-1 Geodetic)
Orbit Period: 99999 minutes
Inclination Angle: 66.15 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
JMR
SENSOR
Name: JASON-1 MICROWAVE RADIOMETER (JMR)
Swath Width: - km
Description: The JMR mreasures teh sea surface microwave brightness temperatures at three frequencies (18.7 GHz, 23.8 GHz and 34.0 GHz) to provide the total water vapor content in the troposphere along the altimeter beam. The 23.8 GHz channel is the primary channel for water-vapor measurement and is a redundant channel on the JMR. The 18.7 GHz channel provides a correction for wind-induced effects in the sea surface background emissions, and the 34.0 GHz channel provides a correction for cloud liquid water. The measurements are combined to obtain the error in the satellite range measurements caused by pulse delay due to the water vapor.

ProjectResearch Opportunities in Space and Earth Science (ROSES)
Data ProviderCreator: CCAR, University of Colorado, Boulder
Release Place: -
Release Date: 2013-Jun-11
Resource: -
Keyword(s)SSHA, SSH, SLA, Sea Surface Height, Sea Level, OST, Reconstruction
Persistent IDPODAAC-RECSL-000V1
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Journal References
JGR referencehttp://onlinelibrary.wiley.com/doi/10.1029/2011JC007529/full
Hamlington, B. D., R. R. Leben, R. S. Nerem, W. Han, and K.-Y. Kim (2011), Reconstructing sea level using cyclostationary empirical orthogonal functions, Journal of Geophysical Research, 116, C12015, doi:10.1029/2011JC007529
Geoscience Data Journal referencehttp://onlinelibrary.wiley.com/doi/10.1002/gdj3.6/full
Hamlington, B. D., Leben, R. R., Strassburg, M. W. and Kim, K.-Y. (2014), Cyclostationary empirical orthogonal function sea-level reconstruction. Geoscience Data Journal. doi: 10.1002/gdj3.6
Citation CCAR, University of Colorado, Boulder. 2013. Reconstructed Sea Level Version 1. Ver. 1. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at http://dx.doi.org/10.5067/RECSL-000V1.

For more information see Data Citations and Acknowledgments.

Journal Reference Hamlington, B. D., Leben, R. R., Strassburg, M. W. and Kim, K.-Y. (2014), Cyclostationary empirical orthogonal function sea-level reconstruction. Geoscience Data Journal. doi: 10.1002/gdj3.6