AVISO Level 4 Absolute Dynamic Topography for Climate Model Comparison

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Year	Citation
2016	AVISO (2011), AVISO Level 4 Absolute Dynamic Topography for Climate Model Comparison. Ver. 1. PO.DAAC, CA, USA. [Available at http://dx.doi.org/10.5067/DYNTO-1D1M1, last accessed 15 Jun. 2004.] Vertical heat flux in the ocean: Estimates from observations and from a coupled general circulation model, Journal of Geophysical,https://doi.org/10.1002/2016JC011647

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DOI	10.5067/DYNTO-1D1M1
Short Name	AVISO_L4_DYN_TOPO_1DEG_1MO
Description	This dataset contains absolute dynamic topography (similar to sea level but with respect to the geoid) binned and averaged monthly on 1 degree grids. The coverage is from October 1992 to December 2010. These data were provided by AVISO (French space agency data provider) to support the CMIP5 (Coupled Model Intercomparison Project Phase 5) under the World Climate Research Program (WCRP) and was first made available via the JPL Earth System Grid. The dynamic topography are derived from sea surface height measured by several satellites including Envisat, TOPEX/Poseidon, Jason-1 and OSTM/Jason-2, and referenced to the geoid. Along with this dataset, two additional ancillary data files are included in the same directory which contain the number of observations and standard error co-located on the same 1 degree grids.
Version	1
Dataset Type	OPEN
Measurement	Oceans > Sea Surface Topography > Sea Surface Height
Processing Level	4
Coverage	Region: Global Northernmost Latitude: 90 degrees Southernmost Latitude: -90 degrees Westernmost Longitude: 0 degrees Easternmost Longitude: 360 degrees Time Span: 1992-Oct-01 to 2010-Dec-30
Resolution	Spatial Resolution: 1 degrees (Latitude) x 1 degrees (Longitude) Temporal Resolution: 1 Month
Projection	Type: Gridded Detail: Ellipsoid: WGS 84
Latency	hours
Platform/Sensor	ENVISAT Platform Name: Environmental Satellite (ENVISAT) Orbit Period: 100.59 minutes Inclination Angle: 98.55 degrees Ascending Node: 1970-Jan-01 00:00:00 / RA-2 SENSOR Name: Radar Altimeter 2 (RA-2) Swath Width: 5 km Description: Nadir pointing radar altimeter measuring at 13.575 GHz (Ku band) and 3.2 GHz (S band) 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 / JASON-1 Microwave Radiometer SENSOR Name: JASON-1 MICROWAVE RADIOMETER (JASON-1 Microwave Radiometer) Swath Width: 22.9 km Description: The JMR measures the 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 / ALT (TOPEX) SENSOR Name: TOPEX ALTIMETER (ALT (TOPEX)) 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 / SSALT SENSOR Name: POSEIDON Solid State Radar Altimeter (SSALT) 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 / TMR SENSOR Name: TOPEX MICROWAVE RADIOMETER (TMR) 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. ERS-1 Platform Name: European Remote Sensing Satellite-1 (ERS-1) Orbit Period: 100.3 minutes Inclination Angle: 98.5 degrees Ascending Node: 1970-Jan-01 00:00:00 / ERS-1 ALTIMETER SENSOR Name: European Remote Sensing 1 altimeter (ERS-1 ALTIMETER) Swath Width: 143 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. ERS-2 Platform Name: European Remote Sensing Satellite-2 (ERS-2) Orbit Period: 100.3 minutes Inclination Angle: 98.5 degrees Ascending Node: 1970-Jan-01 00:00:00 / ERS-2 Altimeter SENSOR Name: European Remote Sensing 2 altimeter (ERS-2 Altimeter) Swath Width: - km Description: Radar Altimeter (RA) provides accurate measurements of sea surface elevation, significant wave heights, various ice parameters and an estimate of sea surface wind speed. 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: - GRACE Platform Name: Gravity Recovery and Climate Experiment (GRACE) Orbit Period: -1 minutes Inclination Angle: 89 degrees Ascending Node: 1970-Jan-01 00:00:00 / GRACE-FO ACC SENSOR Name: GRACE-FO SuperSTAR Accelerometer (GRACE-FO ACC) Swath Width: -1 km Description: The accelerometer, located at the center of mass of each satellite, measures all non-gravitational forces acting on each satellite. These forces include air drag, solar radiation pressure, and attitude control activator operation. GRACE Platform Name: Gravity Recovery and Climate Experiment (GRACE) Orbit Period: -1 minutes Inclination Angle: 89 degrees Ascending Node: 1970-Jan-01 00:00:00 / GRACE SCA SENSOR Name: Star Camera Assembly (GRACE SCA) Swath Width: - km Description: The two star cameras mounted close to the accelerometer on each satellite provide the precise attitude references for the satellites when making science measurements. GRACE Platform Name: Gravity Recovery and Climate Experiment (GRACE) Orbit Period: -1 minutes Inclination Angle: 89 degrees Ascending Node: 1970-Jan-01 00:00:00 / GRACE-FO KBR SENSOR Name: GRACE-FO K-Band Ranging System (GRACE-FO KBR) Swath Width: -1 km Description: This instrument precisely measures the changes in the separation between the two GRACE satellites using phase tracking of K- and Ka-band signals sent between the two satellites
Project	AVISO (AVISO)
Data Provider	Creator: AVISO Release Place: JPL Release Date: 2011-Mar-01 Resource: https://podaac-tools.jpl.nasa.gov/drive/files/allData/aviso/L4/dynamic_topo_1deg_1mo/docs/zosTechNote_AVISO_L4_199210-201012.pdf
Keyword(s)	absolute dynamic topography, dynamic topography, sea level
Persistent ID	PODAAC-DYNTO-1D1M1

Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov

PO.DAAC DRIVE	https://podaac-tools.jpl.nasa.gov/drive/files/allData/aviso/L4/dynamic_topo_1deg_1mo
OPENDAP	https://podaac-opendap.jpl.nasa.gov/opendap/allData/aviso/L4/dynamic_topo_1deg_1mo/
Format (Compression)	NETCDF (NONE)
THREDDS	http://thredds.jpl.nasa.gov/thredds/catalog/ncml_aggregation/SeaSurfaceTopography/aviso/dynamic_topo_1deg_1mo/catalog.html
Web Service	https://podaac.jpl.nasa.gov/ws/search/granule/?datasetId=PODAAC-DYNTO-1D1M1 (Search Granule)
Tools and Services
LAS	https://podaac-tools.jpl.nasa.gov/las Live Access Server

Citation

AVISO. 2011. AVISO Level 4 Absolute Dynamic Topography for Climate Model Comparison. Ver. 1. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/DYNTO-1D1M1.

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