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Level 2 Ocean Salinity L2OS v611 status. 12 February 2014. ARGANS & SMOS L2OS ESL. L2OS v61x status. v610 FAT 8/9 October 2013; v611 delivered 12 December 2014 Changes in v611 delivery: multi-threading optimisation global region defined for AUX_DTBXY_ L1 metrics updated galactic maps - PowerPoint PPT Presentation
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SMOS L2 Ocean Salinity
www.argans.co.uk
Level 2 Ocean Salinity
L2OS v611 status
12 February 2014
ARGANS & SMOS L2OS ESL
SMOS L2 Ocean Salinity
www.argans.co.uk
v610 FAT 8/9 October 2013; v611 delivered 12 December 2014
Changes in v611 delivery:
• multi-threading optimisation
• global region defined for AUX_DTBXY_ L1 metrics
• updated galactic maps
• new DAP schema in v61x for faster ESL analysis
Planning:
• v612 bug fix delivery due 28/02/2014
• Tools prototyped for summer delivery
• On-going L1c v61x metrics analysis
• v620...
L2OS v61x status
SMOS L2 Ocean Salinity
www.argans.co.uk
Optimised multi-threading: stress test results
L2OS v611:
• Optimised by skipping coast/land grid points (new Fg_ctrl_ignore flag) & code re-organisation
• Now close to reprocessing 12:1 target
• Detailed analysis in reports
Day t_max nGPs Orbit type
20110503 131.95 125485 A
20110510 157.467 129741 A
20110511 160.683 130591 A
20110512 135.7 131216 D
20110513 130.55 129182 A
20110514 133.4 130819 A
20110515 131.867 129783 D
20110516 133.933 135575 A
20110517 130.217 128767 D
20110518 131.3 134597 A
Averages 137.71 130576
Day t_max nGPs Orbit type
20110509 96.35 130700 A
20110510 96.85 128791 A
20110511 96.25 127306 A
20110512 131.28 127228 A
Averages 105.18 128506
v610 v611
SMOS L2 Ocean Salinity
www.argans.co.uk
Global region for L1 metrics
For each orbit, AUX_DTBXY_ contains per snapshot deltaTB for each region:
List_of_Snapshots Record start
Snapshot_ID Snapshot ID from L1c
Latitude Snapshot boresight latitude
Longitude Snapshot boresight longitude
flags L1c flags for first measurement in snapshot
deltaTB Mean deltaTB (= L1c BT minus forward model 1 BT) for all snapshot measurements within a 0.3 radius circle at xi/eta (0,0).
List_of_Snapshots Record end
Regions can be extracted routinely or for metrics:
SMOS L2 Ocean Salinity
www.argans.co.uk
Updated AUX_GAL2OS
First Stokes/2, old minus new map
Updated GAL2OS with new sky map, without changing model fitting...
SMOS L2 Ocean Salinity
www.argans.co.uk
Updated AUX_GAL_OS
strong sources delta(new – old)
delta(new – old) delta new Sky(PW) – Sky(JT)
Difference between WEF smoothing using PW or JT’s method -0.5K to 2.6K near galactic plane, std 0.21K: only significant when WS < 2m/s (rare), and < other errors in SSS retrrieval
SMOS L2 Ocean Salinity
www.argans.co.uk
Impact of new galactic map on SSS
old GAL_OS & GAL2_OS new GALOS new GAL_OS & GAL2_OS
SMOS L2 Ocean Salinity
www.argans.co.uk
delta SSS (new – old)
old GAL_OS & GAL2_OS delta(GALOS) delta(new GAL_OS & GAL2_OS)
~0.2 to 0.3 psu delta from ~0.1 to 0.2K in GAL2OS
SMOS L2 Ocean Salinity
www.argans.co.uk
GAL_OS applied at low wind speeds
WS delta(new GALOS) count(Fm_gal_noise_error)
WS < 3m/s raises Fm_gal_noise_error in galactic plane
SMOS L2 Ocean Salinity
www.argans.co.uk
n x grid points:
ID, lat/longpriors & sigmas (4 x 14)
posts & sigmas (4 x 14)
oor flags (4 x 27)
fields (8)
m x measurements:
flags (4 x 30)
fieldsdeltaTB (x4)
TBgal (x2)
n x grid points:
ID, lat/longpriors & sigmas (4 x 14)
posts & sigmas (4 x 14)
oor flags (4 x 27)
fields (8)
n x grid points:
IDm x measurements:
snapshot IDxi, etaflags (1 x 30)
fieldsdeltaTB (M1)
TBgal (x2)
Fixed block size grid pointsVariable
block size grid points
Variable block size
measurements
Improved DAP readability
v600 v61x
xi/eta can be used to investigate deltaTBs (but need to read L1c to get BTs)
SMOS L2 Ocean Salinity
www.argans.co.uk
Tools delivery April/May 2014 (see later ppt)
Tuning L2OS v61x with L1 from metrics, & then from reprocessing
• thresholds (outlier detection, RFI, A3TEC, OTT post-processor), L1 flags
• improving & cross-verifying RFI detection
Would be good to see impact of L2OS/L1 v61x before defining L2OS v620
v620 September/October delivery 2014, possible evolution:
• refining A3TEC retrieval – eg land
• improving & cross-verifying RFI detection
• …
L2OS short-term plan