Level 2 Ocean Salinity

SMOS L2 Ocean Salinity – PM#25

www.argans.co.uk/smos

1/20

Level 2 Ocean Salinity16-17 May 2013

v600 statusv610 planning & schedule

Slim-line UDP & improved DAP



2/20

L2OS Post-FAT delivery 28 February 2013

L1OP FAT end April 2013

CCB v600 baseline May 2013: L1 & L2 product specifications will be updated

Processing TDSG-POD L1OP processing started(?), includes JT’s OS set of S. Pacific orbits (?)

L1OP products expected in G-POD by end of May for analysis in June -> QWG 4/5 July

IDEAS to process 1 month (which?) L1c -> L2 SM & OS, to check AUX_DGGRFI post-processor

QWG to evaluate L1 v600, maybe approve hexagonal full cross-pol G-matrix for v610

DPGS installation TBD

v600 status



3/20

Planned changesSlim-line UDP, improved DAP – specification needed now

TEC from Stokes3 – approved at QWG#10, implemented, needs verification

OTT post-processor (OTTPP) – implementation on-going, will need verification

Proposed schedulemodify L2OS to generate AUX_DTBXY for OTTPP by mid-May 2013 (done)

implement OTTPP by mid-June 2013

QWG #11 approval of L2OS v610 baseline (need preliminary results by 4/5 July 2013)

process 1 month (same as DGGRFI test?) L1c (v504/v600?) for OTTPP/A3TEC verification

start June, finish end August -> ESL (use L1c May 2011)

pre-delivery for schema verification & orchestration tests early July 2013

ESL analysis (Argo/ISAS collocation) of 1 month of new UDP/DAP during September 2013

FAT end September 2013; L1OP v610 ???

QWG#12 October 2013?

v610 in DPGS late 2013, full reprocessing February 2014???

v610 planning & schedule



4/20

MotivationUDP includes too many flags & fields – confusing to users

UDP should be simplified so users are easily able to extract good quality data

DAP should be improved so it is easier to retrieve grid point data:

grid point records are variable length because they include measurement data ->

processing DAP takes a long time

ActionsMove flags/fields from UDP to DAP

which fields are useful for users?

which flags are essential for users?

Restructure DAP into block of all grid point data, followed by block of all measurement data

users/ESL can read just the grid point data (fixed size) & ignore measurements

all measurement data is still available if required

Slim-line UDP & improved DAP



5/20

v600 DAP

Improving the DAP

n x grid points:IDpriors & postsflagsfields

m x measurements:flagsfields

deltaTBTBgal

n x grid points:IDpriors & postsflagsfields

n x grid points:ID

m x measurements:flagsfields

deltaTBTBgalTBrough...

v610 DAP

Fixed block size grid pointsVariable

block size grid points

Variable block size

measurements



6/20

Science flagsLand/sea/coast, ice?

Hi/lo SSS, SST, WS

Geophysical retrievalsM1: SSS, UN10, VN10, SST, TEC

M2 (?): SSS, SST, WS, TEC

M3: SSS, WS,TEC

M4: Acard, SST

Sigmas on retrieved parameters

Quality index per model

Geophysical priors (from ECMWF)?SST, UN10, VN10, WS

RFI probability

TB 42.5?xx/yy/hh/vv & sigmas

Improving the UDPn x grid points:

ID, lat, long, x_swath, timescience flags

Geophysical priors?RFI probabilityTb 42.5? (nominal model retrieval)

per model:retrieved parameters & sigmasretrieval quality indexretrieval quality flags

Quality flagsFg_ctrl_good_quality

Fg_ctrl_poor_geophysical

Fg_ctrl_poor_retrieval



7/20

Fg_ctrl_poor_retrievalFg_ctrl_range,

Fg_ctrl_sigma,

Fg_ctrl_chi2, Fg_ctrl_chi2_P,

Fg_ctrl_marq, Fg_ctrl_reach_maxiter, Fg_ctrl_retrieval_failed

Fg_ctrl_poor_geophysicalFg_ctrl_many_outliers,

Fg_ctrl_sunglint, Fg_ctrl_moonglint,

Fg_ctrl_num_meas_low,

Fg_ctrl_sc_suspect_ice, Fg_ctrl_sc_rain

Recall that filters in AUX_CNFOSF define which flags are propagated into summary flags

(Fg_ctrl_poor_retrieval, Fg_ctrl_poor_geophysical)

UDP v600 quality flags



8/20

Fg_ctrl_poor_retrievalFg_ctrl_range, – what should the valid range be for SSS (20-40, 25-40?)

Fg_ctrl_sigma,

Fg_ctrl_chi2_P, (ignore Fg_ctrl_chi2)

Fg_ctrl_marq, Fg_ctrl_reach_maxiter (ignore Fg_ctrl_retrieval_failed: will set SSS = -999)

Proposed UDP v610 quality flags

SSS ~20 psu

Amazon plume August 2013, BEC



9/20

Fg_ctrl_poor_retrievalFg_ctrl_range,

Fg_ctrl_sigma, – ignore?

Fg_ctrl_chi2_P,

Fg_ctrl_marq, Fg_ctrl_reach_maxiter


Fg_ctrl_sigma, – set on only 2% of grid points (mainly Arctic) - BEC



10/20

Fg_ctrl_poor_retrievalFg_ctrl_range, Fg_ctrl_sigma(?), Fg_ctrl_chi2_P,

Fg_ctrl_marq, Fg_ctrl_reach_maxiter

Fg_ctrl_poor_geophysicalFg_ctrl_many_outliers, Fg_ctrl_sunglint, Fg_ctrl_moonglint, Fg_ctrl_num_meas_low

(ignore Fg_ctrl_sc_suspect_ice, Fg_ctrl_sc_rain – very low impact on retrievals) - agreed

Fg_ctrl_good_qualityFg_ctrl_poor_retrieval = 0 and Fg_ctrl_poor_geophysical = 0 and x_swath < 360 km and

Dg_af_fov >= 130 and Fg_ctrl_suspect_RFI = 0

(x_swath < 360 similar to Dg_af_fov >= 130) – but Dg_af_fov is just a counter of L1c AFFOV flag, so includes border/belt/braces measurements (border measurements not used)


Level 2 Ocean Salinity

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