Evaluation of sea surface salinity observed by Aquarius and SMOS
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1 SMOS & Aquarius science workshop (April 17, 2013) Evaluation of sea surface salinity observed by Aquarius and SMOS Hiroto Abe, Naoto Ebuchi (Hokkaido University, Japan) 1
2 Introduction (1/1) Aquarius V2.0 has been opened to the public. Other SSS products also have been produced, based on different algorisms (e.g. Combined-Active-Passive (NASA/JPL)) and different measurement (SMOS). Evaluations of these products based on in situ observations are needed to reveal their accuracies and error structures. Objective of this study Evaluate SSS observed by Aquarius and SMOS including their error structures. 2
3 Data (1/1) - Level 2 - Satellite salinity Aquarius SSS (beam1) 1) V2.0 : NASA/JPL PO.DAAC 2) CAP V2.0 : NASA/JPL Dr. Simon Yueh 3) RSS testbed : Remote Sensing Systems (galaxy correction done) In situ salinity 1) Argo salinity : Global Data Assembly Center, realtime mode data 2) TAO/TRITON, PIRATA, RAMA buoys 3
4 Comparison to in situ data (1/3) Argo vs AQ V2.0 Scatter plot of collocated data Aquarius V2.0 (psu) V2.0 Argo salinity (psu) Period : 25 Aug Dec 2012 Matchup condition : 200 km, 12 h 1) wind speed < 15m/s 2) Argo temperature > 5C 3) Argo depth < 12.5 dbar 4) rad_land_frac < ) rad_ice_frac < bias:-0.02 psu Standard deviation (stddev) :0.58 psu 4
5 Comparison to in situ data (2/3) Argo vs AQ Scatter plot of collocated data V2.0 CAP V2.0 RSS testbed Aquarius V2.0 (psu) Argo salinity (psu) bias: psu stddev: Standard deviation is large in this order V2.0 > CAP 2.0 > RSS testbed 5
6 Comparison to in situ data (3/3) Mooring buoy (1 dbar) vs AQ Scatter plot of collocated data V2.0 CAP V2.0 RSS testbed Aquarius V2.0 (psu) Argo salinity (psu) bias: psu stddev: The order does not change 6
7 Error structure (1/3) ~SST~ V2.0 residual CAP V bias stddev Residual analysis RSS testbed Argo temperature( ) Argo temperature( ) The smallest stddev is found in RSS testbed. 7
8 Error structure (2/3) ~wind speed~ V2.0 residual CAP V bias stddev Residual analysis RSS testbed Wind speed (m/s) Wind speed (m/s) The stddev in RSS testbed is the smallest. 8
9 Error structure (3/3) ~SST and wind speed~ Wind speed (m/s) stddev V2.0 CAP V2.0 RSS testbed Argo temperature( ) Stddev (psu) 1) V2.0 has large stddev under low SST and high wind speed conditions. 2) The contrast is strong for stddev in CAP V2.0. 3) Wind speed dependency is weak for stddev in RSS testbed. 9
10 Ascending minus descending seasonality (1/2) Ascending descending V2.0 CAP V2.0 RSS testbed
11 V2.0 Ascending minus descending seasonality (2/2) 60N latitude 0 60S CAP V2.0 S N J M M J S N Ascending descending (latitude-time diagram) (psu) RSS testbed -0.8 SSS bias between ascending and descending is improved for RSS testbed. However, it still remains. 11
12 Data (1/1) - Level 3 - Satellite salinity 1) Aquarius Level 3 V2.0 SSS : NASA/JPL PO.DAAC 2) SMOS Level 3 reprocessed SSS : CATDS, CNES Salinity data 1) Argo optimal interpolation : JAMSTEC (MOAA GPV) (Argo salinities are interpolated based on World Ocean Atlas 2001 as the first guess) 2) Assimilation data system : Japan Meteorological Research Institute (MRI) (In-situ and satellite altimeter data are assimilated. Combination of OGCM and EOF) 12
13 Comparison to monthly JAMSTEC Argo OI (1/3) Aquarius V2.0 Aquarius V2.0 v.s. JAMSTEC Argo OI (March 2012) Aquarius V2.0 JAMSTEC Argo OI JAMSTEC Argo OI (10m) Stddev is 0.38 psu (>0.2 psu) Residual SSS are negative 1) low latitude 2) Kuroshio and Gulf stream 13
14 Comparison to monthly JAMSTEC Argo OI (2/3) SMOS SMOS v.s. JAMSTEC Argo OI (March 2012) SMOS JAMSTEC Argo OI JAMSTEC Argo OI (10m) 14
15 Comparison to monthly JAMSTEC Argo OI (3/3) Stddev of residual SSS (psu) (40S-40N) Aquarius 0.33 psu < SMOS 0.35 psu 15
16 Comparison to J-MRI assimilation system (1/3) Aquarius V2.0 Aquarius V2.0 v.s. J-MRI assimilation (March 2012) Aquarius V2.0 MRI assimilation SSS MRI assimilation SSS (1m) 16
17 Comparison to J-MRI assimilation system (2/3) SMOS SMOS v.s. J-MRI assimilation (March 2012) SMOS MRI assimilation SSS MRI assimilation SSS (1m) 17
18 Comparison to J-MRI assimilation system (3/3) Stddev of residual SSS (psu) (40S-40N) Aquarius 0.36 psu < SMOS 0.39 psu 18
19 Summary (1/2) Aquarius and SMOS SSSs were evaluated. Level 2 (Aquarius) Stddev of residual SSS using Argo ranged from psu. Stddev in RSS testbed was the smallest The stddev showed different error structures. 1) V2.0 : large stddev under low SST and high wind speed. 2) CAP V2.0 : the contrast was strong. 3) RSS testbed : weak dependency for wind speed. Ascending and descending bias was improved for RSS testbed. However it was not removed completely. 19
20 Summary (2/2) Level 3 (Aquarius and SMOS) Stddev of the residual for the Aquarius SSS was smaller than that of SMOS. JAMSTEC Argo OI : 0.33 psu (AQ) and 0.35 psu (SMOS) J-MRI assimilation : 0.36 psu (AQ) and 0.39 psu (SMOS) Acknowledgment We would like to thank all the data provider! 20
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