ALES Envisat Coastal Altimetry Version 1

ALES Envisat Coastal Altimetry Version 1
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DOINot Registered
Short NameALES_L2_OST_ENVISAT_V1
DescriptionAdaptive Leading Edge Subwaveform (ALES) provides coastal and open ocean altimetric measurements by applying a specialized retracker to Envisat data. This is an along-track dataset that takes takes the high frequency SGDR data and retracks it to remove the waveforms that show land contamination. Therefore these data are provided at 18 Hz. It is similar to the Jason-2 SGDR data except that it also includes ALES variables for the range, significant wave height and sigma0 so that the user can calculate the retracked SSHA.
Version1
Dataset TypeOPEN
MeasurementOCEANS > OCEAN WAVES > SIGNIFICANT WAVE HEIGHT > NONE
OCEANS > SEA SURFACE TOPOGRAPHY > SEA SURFACE HEIGHT > NONE
Processing Level2
CoverageRegion: Global
Northernmost Latitude: 82 degrees
Southernmost Latitude: -82 degrees
Westernmost Longitude: 0 degrees
Easternmost Longitude: 360 degrees
Time Span: 2002-May-14 to 2010-Oct-22
ResolutionSpatial Resolution: 11.1 km (Along) x 4 km (Across)
ProjectionType: Swath
Detail:
Ellipsoid:
Latency hours
Swath Width4 m
Sample Frequency20
Temporal Repeat (Nominal)35 Day
Temporal Repeat (Min)-
Temporal Repeat (Max)-
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)

ENVISAT
Platform
Name: Environmental Satellite (ENVISAT)
Orbit Period: 100.59 minutes
Inclination Angle: 98.55 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
MWR
SENSOR
Name: ENVISAT MICROWAVE RADIOMETER (MWR)
Swath Width: 20 km
Description: The main objective of the microwave radiometer is the measurement of atmospheric humidity as supplementary information for tropospheric path correction of the radar altimeter signal, which is influenced both by the integrated atmospheric water vapour content and by liquid water. In addition, MWR measurement data are useful for the determination of surface emissivity and soil moisture over land, for surface energy budget, investigations to support atmospheric studies, and for ice characterisation. The MWR instrument on board Envisat is a derivative of the radiometers used on the ERS-1 and ERS-2 satellites. It is a dual-channel nadir-pointing Dicke-type radiometer, operating at frequencies of 23.8 GHz and 36.5 GHz. (http://envisat.esa.int/earth/www/object/index.cfm?fobjectid=3775)

ProjectENVISAT (ENVISAT)
Data ProviderCreator: Passaro, M., P. Cipollini, S. Vignudelli, G. D. Quartly, and H. M. Snaith
Release Place: PO.DAAC
Release Date: 2015-Dec-07
Resource: -
Keyword(s)Sea Level Anomaly, Sea Surface Height, Sea Surface Height Anomaly, SSHA, SSH, SLA, SWH
Persistent IDPODAAC-ALESC-EN001
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Citation Passaro, M., P. Cipollini, S. Vignudelli, G. D. Quartly, and H. M. Snaith. 2015. ALES Envisat Coastal Altimetry Version 1. Ver. 1. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD].

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