National Aeronautics and Space Administration Aquarius Validation Data System Overview and Status Algorithm Workshop March 21-22, 2007 John Gunn Earth & Space Research

2 of March, 2007 Aquarius Algorithm Workshop AVDS: J. Gunn The Aquarius Validation Data Segment (AVDS) will collect and process surface measurements for Aquarius data processing Deliver surface calibration data to Aquarius Data Processing Segment (ADPS) Liaison with observers Daily data acquisition Quality control/editing Uniform data format John Gunn Task Leader: John Gunn AVDS Aquarius Validation Program

3 of March, 2007 Aquarius Algorithm Workshop AVDS: J. Gunn In-situ data AVDS ESR AVDS ESR ADPS GSFC ADPS GSFC USERS GTSPP Validation data Via ftp daily AVDS/ADPS Interaction Match up with Aquarius beams for calibration

4 of March, 2007 Aquarius Algorithm Workshop AVDS: J. Gunn AVDS Structure AVDS Server (ESR) Data Filters DBMS ADPS (GSFC) ADPS (GSFC) AVDS Text files AVDS Text files Satellite HDF files Satellite HDF files Aligned Data files Aligned Data files Tabulated files Tabulated files User requests User requests Web interface Web interface In situ data In situ data Primary data path Red implies GSFC Blue implies ESR

5 of March, 2007 Aquarius Algorithm Workshop AVDS: J. Gunn In situ data filters Evaluate data for inclusion based on depth, QC flags Duplicate data removed At present, chooses daily data two weeks prior to real-time Time and space selection limits specified (method TBD) Formats data into text file for uploading by ADPS

6 of March, 2007 Aquarius Algorithm Workshop AVDS: J. Gunn AVDS text file format example

7 of March, 2007 Aquarius Algorithm Workshop AVDS: J. Gunn 3 beams, 76 x 94, 84 x 120, 96 x 156 km instantaneous footprint ellipses across the 390 km wide swath. 390 km Orbit Spacing Match-up Scheme Buoy Obs. Search Radius Match-up processing One match-up file per buoy observation contains all the satellite data in the search radius Subsequent processing to generate the optimal weighted average satellite observation per buoy Global tabulations Match-up processing One match-up file per buoy observation contains all the satellite data in the search radius Subsequent processing to generate the optimal weighted average satellite observation per buoy Global tabulations

8 of March, 2007 Aquarius Algorithm Workshop AVDS: J. Gunn Match-up Data Processing Run on ESR data server Uses inputs from AVDS text file and subsequently generated satellite data file (HDF) Process data from each beam and variable separately Perform a weighted average of the pass data centered on the CPA Weighting function shall be Gaussian with e-folding radius half of Aquarius beam width Weighting function to be evaluated through subsequent analysis

9 of March, 2007 Aquarius Algorithm Workshop AVDS: J. Gunn Database Management System Structured similar to SeaBASS functionality SQL based relational database Search and retrieve capability for in situ, match-up data and originating data by time, geo-location, original platform characteristics and other TBD metadata. Source information for original data may be specified rather than actual data Web-based interface

10 of March, 2007 Aquarius Algorithm Workshop AVDS: J. Gunn AVDS - Recent Accomplishments Ongoing liaisons with DAC’s Completion of AVDS/ADPS ICD Transfer of real-time ARGO float data to ADPS Recovery of matched up MODIS SST data to AVDS

11 of March, 2007 Aquarius Algorithm Workshop AVDS: J. Gunn AVDS - On-going Elements Definition of key functional requirements (document in progress) Draft AVDP Plan in preparation

12 of March, 2007 Aquarius Algorithm Workshop AVDS: J. Gunn Upcoming Tasks Definition and procurement of RDBMS software Specification of AVDS dedicated data server (disk space requirements, etc.) Web site development