Download pdf - CCAR Near Real Time and Historical Altimeter Data Servergcoos.tamu.edu/meetingreports/2015-Mar/Leben.pdf · CCAR Near Real Time and Historical Altimeter Data Server ... Altimetry

Colorado Center for Astrodynamics Research University of Colorado Boulder GCOOS BOD Meeting • March 11-12, 2015

CCAR Near Real Time and Historical Altimeter Data Server

http://eddy.colorado.edu/ccar/data_viewer/index

Bob LebenColorado Center for Astrodynamics Research

University of Colorado Boulder

March 2015 GCOOS BOD Meeting


CCAR “Near Real Time” Altimeter Data System

! In late 1995, the CCAR Near Real Time (NRT) Altimeter Data System project began as a demonstration program in the GoM based on NRT altimeter data streams from the TOPEX and ERS-1&2 satellite missions.

! The quick-look processing was designed to map mesoscale sea surface height (SSH) variability in the Gulf of Mexico.

! In early 1996, processing was sufficiently optimized so that “global” maps could be made of mesoscale SSH anomaly and posted online at CCAR daily by 12:00 p.m. MST.

! Developed with NASA Ocean Surface Topography Science Team (OSTST) and NASA/JPL Outreach Grants.

! Was the first operational “online” near real-time ocean altimeter data system.


Graphics Files Created by Users of CCAR Web Server


CCAR “Historical” Data Archive

The CCAR Altimeter Data System was redesigned from the ground up with a NASA OSTST Grant from 2008-2012.! All codes translated from Fortran to MATLAB.! Historical database moved to the “Radar Altimeter Database

System” (RADS) supported by NOAA Laboratory for Satellite Altimetry (LSA).

! Processing of non-repeat data added to support non-repeat track altimetry from ERS-1, Envisat, Jason-1 and Cryosat.

This allowed a reanalysis of the 1993 to present historical record and the rapid addition of new missions to the NRT processing.The web server graphical interface to both the near real-time and historical data archives was also updated.


Seasat Jul-Aug 1978: Loop Current and Eddy


LCE Separation & Retreat Latitude: 34-year Record

Pre-Altimetry Altimetry

GCOOS SSH

Online Archive of GoM SSH from CCAR “Historical” Mesoscale SSH Archive! Research quality data.! Years 2004-2014.! Each year of data can be

downloaded in NetCDF format.

! Animations of each year in the archive can also be viewed.

! The Feb ’14 GCOOS Newsletter highlighted the dataset.


GCOOS Funding Support & Outlook

! GCOOS funding level is ~$20K per year. This funding has provided student support for graduate and undergraduate students working on the CCAR Altimeter Data System. Currently two hourly students are supported by the contract.

! In the past two years GCOOS has provided ~$2K per year to the data system maintenance and operations (M&O) cost.

! GCOOS funding is leveraged with ~$50K of funding from NASA/JPL outreach in FY ‘15, which provides salary support for me to perform student training and outreach activities. This funding, however, is half of what it was 3 years ago.

! Nevertheless, with the redesign of the data system and use of undergraduate students this remains a viable operational remote sensing data system at this funding level.


Activities proposed with current funding

Key activities this year:! Add Jason-3 altimetry to data system after launch in July.! Reconfigure Jason-2 processing to tandem interleaved orbit

after calibration and validation of Jason-3.Some other activities that might be pursued with current funding:! Loop Current metrics and Loop Current Eddy climatology.! Yucatan Channel transport.! Highlights GoM operational applications and research

performed with altimetry.

.

.

.

.


Athie et al., 2015 - GRL


Offshore Operational Support: Gulf of Mexico

Data User: Capt. Karl Greig, captain of a large anchor handling tug boat owned by Edison Chouest Offshore.Application: Route finding for towing semi-submersible drilling rigs used in deepwater oil and gas exploration. Operation: Moving a rig from Mississippi Canyon block 68 to Mustang Island block 68, a total of 425 nautical miles. Typical towing speeds are 3 to 4 knots so avoiding and/or using eddy currents significantly reduces transit times, in this case by over 50 hours. Altimeter Product Used: Overlays of geostrophic velocity vectors on colored magnitudes values accessed on CCAR website by satellite phone.Estimated Savings: $650,000 in rig downtime and towing costs.


Near real-time currents: August 15, 2003

xx Mustang Island

lease block

Mississippi Canyonlease block


Sport Sailing

The dataset was highlighted in The dataset was highlighted in


THANKS!