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Aquarius optimum interpolation analysis for global and regional studies O. Melnichenko, P. Hacker, N. Maximenko, G. Lagerloef, and J. Potemra 2014 Aquarius/SAC-D.

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Presentation on theme: "Aquarius optimum interpolation analysis for global and regional studies O. Melnichenko, P. Hacker, N. Maximenko, G. Lagerloef, and J. Potemra 2014 Aquarius/SAC-D."— Presentation transcript:

1 Aquarius optimum interpolation analysis for global and regional studies O. Melnichenko, P. Hacker, N. Maximenko, G. Lagerloef, and J. Potemra 2014 Aquarius/SAC-D Science Team Meeting 11-14 November 2014, Seattle, Washington 76x94 km 84x120 km 96x156 km 3 beams 390 km wide swath

2 Objectives: Objectives: To develop gridded SSS analysis from Aquarius Level 2 (swath) data and improve the utility (reduce the noise) of the SSS fields: 1)Near-global coverage 2)From Sep 2011 - present 3)(O~150 km) spatial scales 4)Weekly temporal scales 5)Global RMS error < 0.2 psu Challenges: Challenges: satellite biases, high level of instrument noise; correlated errors Approach: Approach: 1) correction for large-scale biases, 2) optimum interpolation (OI) that takes into account analyzed errors on the observations, specific to the Aquarius instrument

3 Beam 2 Beam 3 Beam 1 AscendingDescending Mean spatial bias correction fields for Aquarius ascending (left) and descending (right) data and for each of the three beams. Correction for large-scale satellite biases:

4 Input information for OI Input data: Aquarius along-track SSS smoothed with a running Hanning filter of half-width of ~60 km. Latitude SSS Signal covariance: from Aquarius L2 data R, km Latitude Aquarius OI model 92106 km First guess: Argo-derived monthly SSS (IPRC product) Example: September 2011 Long-wavelength error covariance: Statistics of the inter-beam biases are inferred from Aquarius – HYCOM inter-comparison. =500 km x Error covariance matrix (Le Traon et al., 1998): Melnichenko et al. [2014], JAOTec, 31, 1583-1600

5 Sep 3-9, 2011 Sub-Arctic Front in the North PacificAmazon River Plume Sep 9-15, 2012 Far Eastern Pacific Fresh Pool Feb 12-18, 2012 A new gridded SSS product from Aquarius The Aquarius OI SSS dataset is open for free unrestricted use and can be accessed from the APDRC webpage: http://apdrc.soest.hawaii.edu/datadoc/oisss.php

6 Argo SSS September 2011 (first guess) Aquarius OI SSS September 2011 grad(SSS) psu/100km A new high-resolution SSS product from Aquarius

7 The error statistics are calculated by comparing Argo buoy measurements for a given week (~1000, z < 6 m) with SSS values at the same locations obtained by interpolating the corresponding Aquarius-derived SSS maps. Statistics of the differences between Argo buoy data and Aquarius OI SSS analysis for the period from September 2011 through August 2014 Mean Difference, psu RMSD, psu OI SSS L3 bias_adj L3 original

8 Latitude-time distributions of the zonally averaged differences between weekly SSS maps and the corresponding Argo buoy data (a) Standard Level-3 product without bias correction, (b) Standard Level-3 product with SST-dependent bias correction, and (c) OI SSS OI SSSL3 bias_adj L3 original

9 RMS Differences (psu) between weekly OI SSS maps and concurrent Argo buoy data Sampling RMS error due to unresolved small-scale variability from Vinogradova and Ponte [2013] 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 Sampling RMS Error Differences can be due to 1.Misrepresentation of SSS by buoy measurements at 5 m depth 2.Unresolved small-scale variability 3.Unresolved temporal variability 4.Errors in the SSS maps 5.All of the above Statistics of the differences between Argo buoy data and Aquarius OI SSS analysis for the period from September 2011 through August 2014

10 Conclusions The Aquarius OI SSS analysis can be assessed from the APDRC webpage http://apdrc.soest.hawaii.edu/datadoc/oisss.php either through the Live Access Server or OPeNDAP. http://apdrc.soest.hawaii.edu/datadoc/oisss.php The description of the mapping methodology as well as some results on statistical validation of the product against concurrent in-situ data can be found in the Technical Notes: http://iprc.soest.hawaii.edu/users/oleg/oisss/glb/Technical_Notes.pdf http://iprc.soest.hawaii.edu/users/oleg/oisss/glb/Technical_Notes.pdf We hope that you find the data useful. Please send comments/questions to oleg@hawaii.edu. oleg@hawaii.edu

11 Long-wavelength error correction is switched off OI SSS analysis for the week September 10-16, 2011 Long-wavelength error correction is switched on

12 Aquarius – Met Office Aquarius - APDRC Static bias (3-year mean) Ascending Descending

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