Altimeter standards
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Product standard ref
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- Topex/Poseidon : GDR-F
- Jason-1 : GDR-D
- Jason2 : GDR-F
- Jason-3 : GDR-F before 30/01/2029 GDRG after
- ERS-1 : –
- ERS-2 : –
- Envisat : Envisat RA2/MWR V3.0 reprocessing
- SARAL-DP/AltiKa: GDRF
- Sentinel-6A : F08 before c122, c122<F09<C160, G01>c160
- Sentinel-3A/B : BC05
- Geosat Follow On : –
- Cryosat-2: Baseline C before c259 Baseline D after
- HaiYang-2A : NSOAS
- HaiYang-2B : NSOAS
- SWOT-nadir : GDR-F before 2025/02/24; GDR-S after (from cyc 29, pass 001)
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Retracking
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- Topex/Poseidon : MLE3/ Pos NR
- Jason-1/2/3 : MLE4
- ERS-1/2 : OPR
- Envisat : MLE3 (OCE1)
- SARAL-DP/AltiKa: MLE4
- Sentinel-6A : Numerical LRM
- Sentinel-3A/B : LRM MLE4/ SAMOSA SAR
- Geosat Follow On : GFO retracker
- Cryosat-2: SAMOSA 2.3
- HaiYang-2A/B : MLE4
- SWOT-nadir : MLE4
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Orbit
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- Topex/Poseidon : GSFC STD18
- Jason-1/2/3 : POE-F
- ERS-1/2 : Reaper
- Envisat : POE-F
- SARAL-DP/AltiKa: POE-F
- Sentinel-3A/B, Sentinel-6A : POE-F
- Geosat Follow On : GSFC
- Cryosat-2: POE-F
- HaiYang-2A : POE-D
- HaiYang-2B : POE-F
- SWOT-nadir : POE-F
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Environemental corrections
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Sea State Bias
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- Topex/Poseidon : 2D Non parametric (Putnam et al., 2023) on Topex; BM4 on Poseidon
- Jason-1: 2D Non parametric (Tran, 2015)
- Jason-2: Non parametric (Tran et al., 2012)
- Jason-3: 2D Non parametric (Bignalet-Cazalet et al., 2021)
- ERS-1: BM3 (Gaspar and Ogor, 1994)
- ERS-2: Non parametric (Mertz et al., 2005)
- Envisat : 2D non parametric (Tran, 2017)
- SARAL-DP/AltiKa: non parametric (Tran, 2019)
- Sentinel-6A: Non Parametric (Bignalet-Cazalet et al., 2021) J3 MLE4 GDR-F
- Sentinel-3A/B : Non parametric (Tran,et al 2021)
- Geosat Follow On : Non parametric (Tran et al., 2010)
- Cryosat-2: 2D Non parametric (baseline C) (Tran, 2018)
- HaiYang-2A: Non parametruc from J3 MLE4 (Bignalet-Cazalet et al., 2021)
- HaiYang-2B: From L2 product
- SWOT-nadir: Non parametruc from J3 MLE4 (Bignalet-Cazalet et al., 2021)
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High Frequency Adjustment
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All missions : none
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Ionospheric
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- Topex/Poseidon : Filtered dual-frequency altimeter range measurements (Ablain and Legeais, 2010) on Topex ; DORIS on Poseidon
- Jason-1 : Filtered dual-frequency altimeter range measurements (Guibbaud et al., 2015)
- Jason2 : Filtered dual-frequency altimeter range (Guibbaud et al., 2015) (from SSB C-band)
- Jason-3 : Filtered dual-frequency altimeter range measurements GDR-F (Nencioli et al., 2022)
- ERS-1 : – Reaper NIC09 model (Scharroo and Smith, 2010)
- ERS-2 : GIM (Iijima et al., 1999)
- Envisat : Filtered from L2; c>65 : GIM (Iijima et al., 1999) corrected for 8mm bias
- SARAL-DP/AltiKa : GIM (Iijima et al., 1999)
- Sentinel-6A : Filtered dual-frequency altimeter range (Guibbaud et al., 2015)
- Sentinel-3A/B : Filtered dual-frequency altimeter rangefrom L2
- Geosat Follow On : GIM (Iijima et al., 1999)
- Cryosat-2: GIM (Iijima et al., 1999)
- HaiYang-2A/B: GIM (Iijima et al., 1999)
- SWOT-nadir : Filtered dual-freq altimeter range (Guibbaud et al., 2015)
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Dry troposphere
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All missions: ERA5 (10-hour) model based
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Wet troposphere
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- Topex/Poseidon : TMR GDRF radiometer reprocessing
- Jason-1: JMR (FCDR) radiometer
- Jason-2/3: AMR radiometer GDR-F
- ERS-1/2 : GPD+ (Fernandes et al., 2015)
- Envisat : MWR radiometer reprocessed
- SARAL-DP/AltiKa: Neuronal Network (5 entries) V4
- Sentinel-6A: AMR radiometer
- Sentinel-3A/B : GPD (Fernandes and Lázaro, 2016)
- Geosat Follow On : GFO Radiometer and ECMWF model
- Cryosat-2: GPD+ (Fernandes and Lázaro, 2016)
- HaiYang-2A/B, SWOT-nadir: ECMWF model
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Geophysical corrections
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DAC
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All missions: TUGO High frequencies forced with analysed ERA5 pressure and wind field before S6A era and ECMWF field after + inverse barometer LF |
Ocean tide
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All missions: FES22b (Loren Carrère et al., 2023) |
Internal tide
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All missions: (Zaron, 2019) (HRETv8.1 tidal frequencies: M2, K1, S2, O1) |
Pole tide
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All missions: (Desai et al., 2015); Mean Pole Location 2017 (Ries and Desai, 2017) |
Solid earth tide
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All missions: Elastic response to tidal potential (Cartwright and Edden, 1973; Cartwright and Tayler, 1971) |
Loading tide
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All missions: FES2014 (Carrere et al., 2016) |
GIA
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All missions: The DUACS products are not corrected from Glacial Isostatic Adjustment (GIA) effects |
Reference surfaces
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Mean Profile/ Mean Sea Surface
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Topex/Poseidon , Jason-1/2/3 repetitive phase: MP computed with Topex/Poseidon (January 1993, April 2002; cycles 11 to 353), Jason-1 (April 2002, October 2008; cycles 10 to 249); Jason-2 (October 2008, May 2016; cycles 10 to 290), Jason-3 (May 2016, December 2021; cycles 11 to 217) and Sentinnel-6A (December 2021, August 2023; cycles 42 to 103) measurements. Referenced to the [1993, 2012] period.
Topex/Poseidon , Jason-1/2 interleaved phase: MP computed with Topex/Poseidon interleaved (September 2002, October 2005; cycles 368 to 481), Jason-1 interleaved (February 2009, March 2012; cycles 262 to 374), Jason-2 interleaved (October-2016; March-2017; cycles 305 to 322).and Jason-3 interleaved (April 2024, August 2023; cycles 300 to 350) measurements. Referenced to the [1993, 2012] period.
Jason-1/2 LRO phase : Hybrid_2023 MSS (SIO,CNES/CLS22,DTU21) (Laloue et al., 2024)
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ERS-1/2: MP computed with with ERS-2 (May 1995, January 2000; cycles 1 to 49), Envisat (May 2002, October 2010; cycles 6 to 94) and SARAL/Altika (Mars 2013, Mars 2015; cycles 1 to 22) measurements. Referenced to the 1993-2012 period.
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Envisat, SARAL-DP/AltiKa repetitive phase: MP computed with computed with with ERS-2 (May 1995, January 2000; cycles 1 to 49), Envisat (May 2002, October 2010; cycles 6 to 94) and SARAL/Altika (Mars 2013, Mars 2015; cycles 1 to 22) measurements. Referenced to the 1993-2012 period.
Envisat, SARAL-DP/AltiKa geodetic phase: Hybrid_2023 MSS (SIO,CNES/CLS22,DTU21) (Laloue et al., 2024)
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Sentinel-3A: MP computed with Sentinel-3A (June 2016, August 2023; cycles 6 to 103). Referenced to the 1993-2012 period
Sentinel-3B: MP computed with Sentinel-3B (November 2018, August 2023; cycles 19 to 83. Referenced to the 1993-2012 period
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Geosat Follow On: MP computed with Geosat Follow On (January 2000, September 2008; cycles 37 to 222) measurements. Referenced to the [1993, 2012] period.
Cryosat-2, HaiYang-2A/B, SWOT-nadir: Hybrid_2023 MSS (SIO,CNES/CLS22,DTU21) (Laloue et al., 2024)
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Mean Dynamic Topography
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All missions: Global: MDT_CNES_CLS22 (Jousset et al., 2023) merged with regional MDT CMEMS_2020 Mediterranean and Black Sea (Jousset et al., 2022; Jousset and Mulet, 2020); Europe: MDT Europe CMEMS_2024 (Jousset et al, in prep)
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