Altimetry Cryosphere Viewer

S3-A launch date: 16 Feb 2016

S3-A operated in faulty open Loop tracking in the ice sheet margins: cycles 1-11

S3-A operational phase started: 7 Dec 2016 (cycle 12), closed loop tracking in Margins

Title	Authors	Journal	Date
Brief communication: Ice sheet elevation measurements from the Sentinel-3A and Sentinel-3B tandem phase	McMillan,M. et al.	Cryosphere	Jul 2021
The Roles of the S3MPC: Monitoring, Validation and Evolution of Sentinel-3 Altimetry Observations	Quartly,G. et al.	Remote Sensing	May 2020
Sentinel-3 Delay-Doppler altimetry over Antarctica	McMillan,M. et al.	Cryosphere	Mar 2019
Extending the Arctic Sea Ice Freeboard and Sea Level Record with the Sentinel-3 Radar Altimeters	Lawrence,I. et al.	ASR	Oct 2019
SPICE WP5: Radar wave interaction with the snowpack	CLS	SPICE Project	July 2018

Note: As of Product Baseline 2.68, the Cryosphere (including sea ice) is fully covered by the ESA Land Product

Product Baseline	Baseline Collection	L2 IPF Versions	Date in Operation	Changes
2.68/1.42(S3B)	004	06.19	09-Jul-2020	Improvement of the Sea-Ice concentration close to the coastline. New SIC ADF in use. New Marine Land Mask, includes all sea ice extent areas The coastal overlap between MARINE and LAND products has been reduced to 50km (25km each sides of the coastline). The pole tide correction has been updated from Whar[1985]to Desaï [2015] model
2.61/1.33(S3B)	004	06.18	21-Jan-2020	New slope model: S3_SR_2_SSM_AX New MSS : S3_SR_2_MSS2AX (DTU18) Update of FES2014 Tide Model library to the latest version of the library A system bias of -0.65 dB isapplied to SARM Ku band and of -1.8dB to the LRM and PLRM Ku band A mean bias of -18 dB is applied to ocog and ice sheet sigma0 parameters
2.43/1.17(S3B)	003	06.15	14-Feb-2019	Major sea ice L2 algorithm changes to correct for negative freeboard Noise power test corrected
2.33/1.00(S3B)	003	06.14	04-Apr-2018
2.27	003	06.12	14-Feb-2018

Baseline	Baseline Collection	IPF Versions	Date	Changes
2.68-Marine	004	06.50	09-Jul-2020	Update of the Marine Land Mask (SR_2_MLM_AX version 004) for the generation of the Marine products. There is no change to the coverage of the Marine products over ocean ; the only change is the extension of the coverage from the coastline to land; from 10 km to 25 km Improvement of the Sea-Ice concentration close to the coastline
2.61	004	06.18	21-Jan-2020	Update of Mean Sea Surface (MSS) to DTU18 Update of FES2014 Tide Model library to the latest version of the library

Fixed Sigma0 bias between Baseline Collections 3 and 4 of -18dB. This affects power corrections
It is recommnended to use cpom software S3Param:sig0_ice_sheet_20_ku_base3, which corrects the bias so that both baselines can be used together.
New slope model in PB2.61 has an issue when the track passes close to areas of high slope, giving relocation of > 20km across track in some cases which is beyond the theoretical limit.
Will be fixed in next slope model release. Does not affect the majority of the ice sheet which has normal slopes (0..1 degs).
Current L1 processing is sub-optimal for high slopes and does not re-center waveforms. This results in truncated echoes.
A dedicated land ice processing is available that corrects this problems (but currently this is only a test data set of 2 years. New thematic operational products are due in 2021.