Orbit comparison for Jason-2 mission between GFZ and CNES (POE-D)
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1 Orbit comparison for Jason-2 mission between GFZ and CNES (POE-D) The GFZ orbit is referred to as GFZ in the following study The CNES orbit is referred to as SL_cci Lionel Zawadzki, Michael Ablain (CLS)
2 Orbit comparison for Jason-2 mission Introduction: We will observe and analyse the impact of the precise orbit computed by GFZ for climate applications. It will be referred to as GFZ. We will compare this orbit with the reference one in SL_cci products, computed by CNES (POE-D). It will be referred to as SL_cci. In order to determine the impact of the GFZ orbit in terms of climate applications and temporal scales, we will try in this study to indicate for each impact detected if it s a positive (+) or a negative (-) impact : Low impact Significant impact No impact detected
3 Global Mean Sea Level Climate Applications Temporal Scales Jason-2 Round Robin Data Package (RRDP) GFZ Versus SL_cci Significant impact detected on Global Mean Sea Level trend 0.3mm/yr trend difference on the Global MSL due to abnormal signal on GFZ orbit solutions (58.77-day signal) Global Mean Sea Level Regional Mean Sea Level Inter annual signals (> 1 year) < 2 months - Temporal of SLA mean calculated globally.
4 Global Mean Sea Level Climate Applications Global Mean Sea Level Regional Mean Sea Level Temporal Scales Inter annual signals (> 1 year) < 2 months Jason-2 Round Robin Data Package (RRDP) GFZ Versus SL_cci - No impact detected on Inter annual The figure below shows the mean difference between the two orbits calculated globally by cycle. It s not easy to determine inter-annual signals due to the wrong signals on the GFZ solution
5 Global Mean Sea Level Climate Applications Global Mean Sea Level Regional Mean Sea Level Temporal Scales Inter annual signals (> 1 year) < 2 months Jason-2 Round Robin Data Package (RRDP) GFZ Versus SL_cci - (60 days) Significant impact detected on Periodic The impact on annual and signals is low (about 0.5mm) 1mm impact on day signal. This signal is an error on GFZ.orbit solution
6 Global Mean Sea Level Upper left panel: Periodograms of SLA around 1 year Lower left panel: Periodograms of SLA between 0-1 year Lower right panel: Periodograms of SLA around day
7 Climate Applications Global Mean Sea Level Regional Mean Sea Level Temporal Scales Inter annual signals (> 1 year) Jason-2 Round Robin Data Package (RRDP) GFZ Versus SL_cci < 2 months - Significant impact detected on a short temporal scale (signals < 2 months): Crossovers Variance Differences are generally positive (see figures on next slide) between 0 and 4 cm²: This means that the new GFZ orbit shows a strong degradation by comparison to the SL_cci orbit. The map of SSH crossovers Variance Differences shows that these degradations are global.
8 Map of Variance differences of Sea Surface Height at crossovers between the GFZ and SL_cci orbits (over all the period): - Significant degradation (4 cm²) at latitudes >±30 and 2cm² at lower latitudes. Temporal of Variance differences of Sea Surface Height at crossovers between two Orbits: - Degradation (between 2 and 4cm²) with GFZ
9 Regional Mean Sea Level Climate Applications Global Mean Sea Level Regional Mean Sea Level Temporal Scales Inter annual signals (> 1 year) < 2 months Jason-2 Round Robin Data Package (RRDP) GFZ Versus SL_cci Significant impact detected on Regional Mean Sea Level We observe a strong impact (~0.5 mm/yr) on the regional trends. It is positive at high positive latitudes; and negative in the Indian and Pacific Oceans. Comparison with CNES POE-E orbit solutions could be foreseen
10 Regional Mean Sea Level Map of Sea Level Anomaly differences between two Orbits (over all the period)
11 Regional Mean Sea Level Climate Applications Global Mean Sea Level Regional Mean Sea Level Temporal Scales Inter annual signals (> 1 year) < 2 months Jason-2 Round Robin Data Package (RRDP) GFZ Versus SL_cci Significant impact detected on Annual and Semi-Annual Amplitudes differences reach 3mm or -3mm for annual and signal (see figures on next slide). These differences are small and it is not possible to determine which orbit is the best one for theses scales. However, the impact on the phases is significant as it reaches 20 (about 20 days of phase shift)
12 Regional Mean Sea Level Map of Sea Level Anomaly differences amplitude for annual signal Map of Sea Level Anomaly differences amplitude for signal SLA with GFZ amplitude SLA with SL_cci amplitude : annual signal SLA with GFZ amplitude SLA with SL_cci amplitude : signal
13 Regional Mean Sea Level Map of Sea Level Anomaly differences phase for annual signal. Map of Sea Level Anomaly differences phase for signal. To be noted a phase value equal to 30 corresponds to a period of one month SLA with GFZ phase SLA with SL_cci phase: annual signal SLA with GFZ phase SLA with SL_cci phase : signal
14 Regional statistics between orbits Map of Mean differences between GFZ and SL_cci (whole Jason-2 period) On this map we observe a difference up to 5 mm over 50 latitude and in Indian Ocean. The differences between the orbits become negative, down to -5mm in the East Pacific Ocean. Map of Standard deviation of the differences between GFZ and SL_cci (whole Jason-2 period) On this map we observe strong differences (~1cm) globally
15 Orbits comparison for Jason-2 mission To conclude: The orbit computed by GFZ shows performances strongly degraded by comparison to SL_cci (CNES POE-C) The main impacts are on the long-term s at regional scale and on the mesoscale and periodic signals:. Scores at crossovers show, SL_cci is better for the mesoscale signal over Jason-2 Period. The 58-day signal in GFZ orbit may be considered as an error, it is especially detected at the beginning and the end of the Jason-2 period. For the regional trends, more investigations are necessary to show if it is an improvement or not Climate Applications Global Mean Sea Level Regional Mean Sea Level Temporal Scales Inter annual signals (> 1 year) Periodic Jason-2 Round Robin Data Package (RRDP) GFZ Versus SL_cci (60 days) < 2 months -
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