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Preliminary studies on Galactic Noise Model

Preliminary studies on Galactic Noise Model. Xiaobin Yin, Jacqueline Boutin LOCEAN. SSS climatology of March. 5-Day SSS from Ascending orbits (Mar. 17-21) Tx & Ty in a xi/eta=0.25 square. 41. 31.

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Preliminary studies on Galactic Noise Model

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  1. Preliminary studies on Galactic Noise Model Xiaobin Yin, Jacqueline Boutin LOCEAN

  2. SSS climatology of March 5-Day SSS from Ascending orbits (Mar. 17-21) Tx & Ty in a xi/eta=0.25 square 41 31 1. Compared with ascending orbits, SSS from descending orbits is lower in the north pacific but higher in the south hemisphere at high latitude. 2. There is a gradient in retrieved SSS, espescially at high latitude why? 5-Day SSS from Descending orbits (Mar. 17-21) Tx & Ty in a xi/eta=0.25 square

  3. SSS from Descending orbits (Mar. 18) Tx & Ty in a xi/eta=0.23 square Using GN 1 for OTT and SSS retrieval Mar.18 T125114_20100318T134515 0N ~ 50S SSS climatology of March SSS from Descending orbits (Mar. 18) Tx & Ty in a xi/eta=0.23 square Using GN 2 for OTT and SSS retrieval OTT computed from an ascending orbit in the East Pacific with different GN models could lead to different retrieved SSS (Not talking about which GN is better)

  4. Two ascending orbits in March, 2010 Gal2 - Gal1 SCSD1C_20100318T125114_20100318T134515_330_001_1, averaged from 0N ~ 50S Ty Tx SCSD1C_20100319T135222_20100319T144622_330_001_1, averaged from 0N ~ 50S Ty Tx

  5. Two ascending orbits in August, 2010 Gal2 - Gal1 SCSF1C_20100804T142022_20100804T151421_344_001_1, averaged from 0N ~ 50S Tx Ty SCSF1C_20100805T134125_20100805T143524_344_001_1, averaged from 0N ~ 50S Tx Ty

  6. SCSD1C_20100319T135222_20100319T144622_330_001_1 Dual pol without TEC the own OTT of each GN computed within [0S 50S] are used March SSS1 (Gal1 - Gal2) SSS1 (Gal2) SSS1 (Gal1) 0.3 40 -0.3 30 Gal 2, SSS (retri - prior) Gal 1, SSS (retri - prior)

  7. Chi2 (Gal 1 - Gal2) Chi2 (Gal 2) Chi2 (Gal 1) 0.3 1.5 -0.3 0.5 WS1 (Gal1 - Gal2) SSS1 (Gal1 - Gal2) 1 0.3 -1 -0.3

  8. March, TB_gal averaged over all incidence angles for each GP SCSD1C_20100319T135222_20100319T144622 Mean Gal 1 for all incidence angles, H pol Mean Gal 2- Gal1 for all incidence angles, H pol Mean Gal 2 for all incidence angles, H pol 4.5K 4.5K 0.2K gradient 2K 2K -0.5K V pol 4.5K 4.5K 0.2K 2K 2K -0.5K

  9. SCSF1C_20100805T134125_20100805T143524_344_001_1 Dual pol without TEC the own OTT of each GN computed within [0S 50S] are used SSS1 (Gal1 - Gal2) SSS1 (Gal2) SSS1 (Gal1) 40 0.3 -0.3 30 Gal 2, SSS (retri - prior) Gal 1, SSS (retri - prior)

  10. Chi2 (Gal2) Chi2 (Gal1) Chi2 (Gal1 - Gal2) 0.3 1.5 -0.3 0.5 WS1 (Gal1 - Gal2) SSS1 (Gal1 - Gal2) 0.3 -0.3

  11. August, TB_gal averaged over all incidence angles for each GP SCSF1C_20100805T134125_20100805T143524 Mean Gal 1 for all incidence angles, H pol Mean Gal 2 for all incidence angles, H pol Mean Gal 2- Gal1 for all incidence angles, H pol 3.5K 3.5K 0.3K 2.5K 2.5K -0.3K V pol 3K 3K 0.3K 1K 1K -0.3K

  12. Conclusions It’s possible that the inaccuracy of GN model lead to 1) Differences of retrieved SSS between ascending and descending orbits. 2) Gradient in retrieved SSS across swath, espescially at high latitude 3) Seasonal differences in SSS 4) Different behavior of OTT w.r.t to retrieved SSS at different latitude 0.2K gradient -0.5K

  13. Retrieved TEC in August Argan's TEC DPGS’s TEC LOCEAN’s TEC, Gal1, xi/eta = 0.23 LOCEAN’s TEC, Gal1, xi/eta= EAFFOV LOCEAN’s TEC, Gal2, xi/eta= 0.23

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