SeaWinds on QuikSCAT Level 3 Sigma-0 Polar-Stereographic Browse Maps (Reduced) of Arctic Region
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|Description||This dataset contains polar-stereographic-gridded, daily averaged Sigma-0 retrievals over the Arctic Polar region from the QuikSCAT L1B retrievals, which are generated using a Scatterometer Image Reconstruction (SIR) technique developed by Dr. David Long at Brigham Young University (BYU); the processed files are therefore known as SIR files. The QuikSCAT scatterometer scans at two nominal incidence angles, 46 degrees and 54.1 degrees, corresponding to the inner and outer beams respectively. The inner beam is horizontally polarized while the outer beam is vertically polarized. The SIR files are separated according to polarization. For example, one SIR file for a particular day will contain the gridded average Sigma-0 values for the horizontally polarized L1B retrievals, while the other will contain those from the vertically polarized L1B retrievals. These SIR files were also used to generate a complimentary dataset of GIF images representing the daily averaged Sigma-0, which is meant for browse purposes only and available here: http://podaac.jpl.nasa.gov/dataset/QSCAT_BYU_L3_OW_SIGMA0_ARCTIC_POLAR-STEREOGRAPHIC_BROWSE_IMAGES. An expanded version of this dataset includes the full daily Sigma-0 statistcs: http://podaac.jpl.nasa.gov/dataset/QSCAT_BYU_L3_OW_SIGMA0_ARCTIC_POLAR-STEREOGRAPHIC_BROWSE_MAPS_FULL. This dataset is generated by the Scatterometer Climate Record Pathfinder (SCP) project at BYU.|
|Measurement||CRYOSPHERE > SEA ICE > ICE EXTENT|
SPECTRAL/ENGINEERING > RADAR > SIGMA NAUGHT > Normalized Radar Cross-Section
Northernmost Latitude: 89.6 degrees
Southernmost Latitude: 70 degrees
Westernmost Longitude: 0 degrees
Easternmost Longitude: 360 degrees
Time Span: 1999-Jul-19 to 2009-Nov-21
Granule Time Span: 1999-Jul-19 to 2009-Nov-21
|Resolution||Spatial Resolution: 0.201 degrees (Latitude) x 0.201 degrees (Longitude)|
Temporal Resolution: 1 Day
Ellipsoid: WGS 84
Name: QUIKSCAT (QUIKSCAT)
Orbit Period: 100.93 minutes
Inclination Angle: 98.6 degrees
Ascending Node: 1999-Jul-19 06:04:49
Name: SeaWinds Scatterometer (SEAWINDS)
Swath Width: 1800 km
Description: SeaWinds is a Ku-band (13.4 GHz) Scatterometer which features a single circular scanning dish antenna to provide pencil-beam measurements, as opposed to the common fan beam design as seen with other spaceborne scatterometers. The pencil-beam design has several key advantages over the more common fan beam design: higher signal-to-noise ratio, smaller size, and superior coverage. The SeaWinds single antenna utilizes twin offset feeds, thus providing two pencil-beam footprint paths with an elliptical sampling footprint of approximately 25 km (in azimuth) by 37 km (in look/range direction); these pencil beams have opposing polarizations (i.e., vertical and horizontal), thus achieving dual-polarization. The SeaWinds instrument provides a full 1800 km-wide swath coverage (including the nadir region), which allows for a nominal daily measurement coverage of 90% over the ice-free oceans.
|Project||Scatterometry Climate Record Pathfinder (SCP)|
|Data Provider||Creator: BYU/SCP|
Release Place: PO.DAAC
Release Date: 2001-Mar-20
|Keyword(s)||sigma-0, sigma0, backscatter, sir, byu, scp, david long|
Questions related to this dataset? Contact firstname.lastname@example.org
|Format (Compression)||RAW (GZIP)|
|Citation||BYU/SCP. 2001. SeaWinds on QuikSCAT Level 3 Sigma-0 Polar-Stereographic Browse Maps (Reduced) of Arctic Region. Ver. 1. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/QSBYU-ARBML.
For more information see Data Citations and Acknowledgments.
|Journal Reference||Chen, R. and D. Long. March, 2001. BYU Daily Browse Images of QuikSCAT Sigma-0 Measurements. JPL Document D-20412. Jet Propulsion Laboratory, Pasadena, CA.|