Presentation is loading. Please wait.

Presentation is loading. Please wait.

SMOS L1v620-L2v613 versus L1v505- L2v550 validation May 2011 Nicolas Martin, Jacqueline Boutin LOCEAN 26 May 2014.

Similar presentations


Presentation on theme: "SMOS L1v620-L2v613 versus L1v505- L2v550 validation May 2011 Nicolas Martin, Jacqueline Boutin LOCEAN 26 May 2014."— Presentation transcript:

1 SMOS L1v620-L2v613 versus L1v505- L2v550 validation May 2011 Nicolas Martin, Jacqueline Boutin LOCEAN 26 May 2014

2 All the metrics SMOS-ARGO and SMOS-ISAS, as well as a complete descriptions of flags, are available on: Observations (at >800km from coast; stats for whole ocean including <800km from land available on web site): -Careful must be taken as L1 AND L2 versions are diffferent -SMOS-ARGO colocations in radii of 9days-100x100km2 are much noisier than SMOS- ISAS monthly comparisons and hence conclusions less clear => in this ppt, we show only SMOS-ISAS -Ascending orbits (next slide) : mean bias is reduced (possibly an effect of daily OTT in new L2) but a positive bias in the northern Pacific, we do not see what in L2 change could create this; likely to be a remaining drawback of L1; larger RFI pollution in Northern Atlantic in v6 than v5: L1 RFI flags not sufficient, RFI flags in L2 need to be optimized, -Descending orbits: improvement of north-south bias likely an effect of TEC retrieval (not an L1 effect) => not shown in this ppt as it does not concern L1 -Land effect: still there (<0 bias) + larger std in v6: possibly RFI sorting less efficient!

3 S[SMOS A]-S[ISAS] - L1Cv620_L2OPv613 S[SMOS A]-S[ISAS] - L1Cv504_L2OPv550 Ascending orbits : mean bias is reduced (possibly an effect of daily OTT in new L2) but a positive bias in the northern Pacific, we do not see what in L2 change could create this; likely to be a remaining drawback of L1; larger RFI pollution in Northern Atlantic in v6 than v5: L1 RFI flags not sufficient, RFI flags in L2 need to be optimized (they have change from L2 v5 to L2v6),

4 Mean difference and std of the difference per region– red: v6; blue: v5 Ascending orbits Mean bias is reduced BUT STD is not improved (even slightly worse on ARGO comparisons see www page); only large scale bias improved

5 Effect of land vicinity (D<800km) : Ascending orbits; still <0; larger std, RFI?

6 Effect of land vicinity (D<800km) : Descending orbits; still <0; larger std, RFI?

7 Descending orbits results Be careful that TEC was retrieved in L2 v6 but not in L2 v5 => latitudinal biases are reduced due to TEC retrieval (see last slides of this presentation shown at QWG 13)

8

9

10 Slides from QWG 13 TEC retrieval in L2 reduces latitudinal biases in descending orbits (tests conducted using same L1c)

11 L2V611b, OTT A3TEC on- A3TEC prior – no TEC dwell retr. SMOS SSS - ISAS SSS: descending PCTVAR<80% (exclude regions with no ARGO) and 700km far from land L2V550 OTT L1cTEC – L1cTECprior – TEC dwell retr. L2V611b, OTT L1cTEC – A3TEC ‘prior’ -no TEC dwell retr. L2V550 OTT A3TEC on - L1cTEC prior –TEC dwell retr. ‘OTT A3TEC on- A3TEC prior – no TEC dwell retr.’ give best retrieved SSS compared with ISAS SSS.

12 SMOS SSS - ISAS SSS: descending Metrics For descending orbits, when ISAS-PCTVAR<80% and SMOS at 700km further from land, ‘OTT A3TEC on- A3TEC prior – no TEC dwell retr.’ give lowest differences (mean and std) compared with ISAS SSS over the global ocean. Global: mean=0.106 (std=0.389) [45S45N;180W180E] : mean=0.0535(std=0.320) [30S30N;180W180E] : mean= (std=0.288) Global: mean=0.188 (std=0.442) [45S45N;180W180E] : mean=0.112 (std=0.362) [30S30N;180W180E] : mean=0.019 (std=0.319) mean=0.002(std=0.355) mean= (std=0.286) mean= (std=0.270) mean= (std=0.408) mean= (std=0.343) mean= (std=0.306) L2V550 OTT L1cTEC – L1cTECprior – TEC dwell retr. L2V550 OTT A3TEC on - L1cTEC prior –TEC dwell retr. L2V611b, OTT L1cTEC – A3TEC ‘prior’ -no TEC dwell retr. L2V611b, OTT A3TEC on- A3TEC prior – no TEC dwell retr.


Download ppt "SMOS L1v620-L2v613 versus L1v505- L2v550 validation May 2011 Nicolas Martin, Jacqueline Boutin LOCEAN 26 May 2014."

Similar presentations


Ads by Google