Ocean Surface Topography From Space

2009 Ocean Surface Topography Science Team Meeting

Abstract Submission

Abstract Submission deadline: June 5, 2009

link to Abstract Submission Form

link to Guidelines for Oral and Poster Presenters

Submission topic areas are:

A. General ocean surface topography science
B. Sea level error budgets: current status and future improvements
C. Global and in-situ calibration and validation
D. Precision orbit determination and geoid
E. Instrument processing
F. Near real-time products validation and application
G. Coastal and inland altimetry
H. Outreach

link to Abstract Submission Form

Detailed descriptions of the above topics:

A. General ocean surface topography science

This category is for abstracts addressing general science results that do not fit into any of the following special topics.

B. Sea level error budgets: current status and future improvements

All uses of altimeter sea level data, from the study of global mean sea
level change to the analysis and forecast of short eddy scales in
assimilation schemes, can benefit from a detailed knowledge of the
uncertainty in the altimeter measurements. This plenary session focuses
on providing an assessment of the error budgets of current altimeter
datasets and on how these budgets can be improved for present and future
missions. Altimeter error components include radar noise, errors in all
environmental corrections (sea state bias, ionospheric and wet/dry
tropospheric corrections, inverted barometer), orbit errors, and errors
in the physical models currently used for dealiasing of tidal and
non-tidal variability. Spatio-temporal and spectral characteristics
of each of these components of the error budget or the combined total
error are of interest, including both systematic and random components
and correlation properties. Discussion of large-scale errors,
particularly those affecting the determination of mean sea level rise,
is very much relevant. Methodologies for tightening the present
altimeter error budgets, from both the hardware and software sides,
should be addressed as much as possible, in preparation for future

C. Global and in-situ calibration and validation

The cal/val splinter will be divided into two sessions, the first focusing on local calibration and the latter on global analysis. Contributions on the following topics are sought:

  • Joint analysis of Jason-1 and Jason-2 data from the tandem verification phase. Emphasis should be placed on unique insights afforded by the cancellation of common mode errors in formation flight.
  • Validation of all available Jason-2 test GDRs, including data collected after the end of the verification phase. We are particularly seeking insight on any potential emerging trends in the data on local, regional or global scales.
  • Validation of the complete set of the Jason-1 GDR-C products. Definitive calibration time series are needed, along with estimates of geographically correlated errors, in order to reconcile local and global results and arrive at a unified error assessment.
  • Validation of Jason-1 GDR-C data on the interleaving ground track.
  • Validation of available reprocessed T/P data. Of particular interest are the impacts of these products on reducing relative GCE observed in the Jason-1/TP (2002) tandem verification phase.  
In order to facilitate comparisons among various results, contributors should focus on results from the official data products. Complementary results from alternative sources are sought, however, if they help to explain errors in the official products.

D. Precision orbit determination (POD) and geoid

The most important POD issues are the validation of the tracking systems on OSTM/ Jason-2, including SLR, DORIS, and GPS, and the assessment of the orbit error, due to commission and omission of both force and measurement models. Papers that intercompare and validate the OSTM POD performance are solicited. Since a prime goal of OSTM is the interconnection of altimetric time series, we are also interested in analysis of the POD performance for Jason-1, both before and after the move to the interleaved orbit. Examples of interesting issues include an assessment of the impact of unmodeled time-variable gravity terms on the satellite orbits, the impact of higher-order ionosphere corrections on the DORIS and GPS POD, the impact of troposphere mapping functions and a priori meteorological data on POD performance, and the implementation of tuned radiation pressure models for Jason-1 and Jason-2. An especially important issue is the impact of the terrestrial reference frame errors on altimetric satellite POD.

With respect to geoid modeling, we are interested in how improvements derived from GRACE and GOCE improve models of dynamic ocean topography and impact studies of ocean circulation. The presentation of new global gravity models that result from integration of satellite tracking (SLR, GPS, DORIS, GRACE, surface gravity and altimetry data) and how they might benefit OSTM are also welcome.

E. Instrument processing

The instrument processing splinter focuses on the algorithms used to generate the level-2 products (GDR or alternatives), excluding external fields (Atmospheric pressure and water vapor models, tide models , etc.), which are addressed in section IV. Presentations in this splinter will focus on performance evaluations of the existing algorithms used to generate the level-2 products, including those algorithms for altimeter re-tracking, wet tropospheric path delay retrieval, sea state bias estimation and instrument flagging, as well as emerging algorithms that promise an enhancement over current capability.

F. Near real-time products validation and application

This session will cover topics related to the production, validation, and applications of the Jason-2 OGDR and Jason-1 OSDR products. The status of the products and their calibration and validation will be presented. The NRT products differ in accuracy from the offline IGDR and GDR data sets. This session will assess the sources of these differences, e.g. in terms of orbit determination and applied sea surface height corrections. Operational applications of the data for monitoring and model assimilation will also be highlighted.

Participants are invited to present and discuss opportunities for improvements of the NRT products, for example an enhanced use of the GPS system for improved NRT orbits. In terms of applications, the session will cover exploitations of the SWH and wind information in wave models and marine meteorology, the use of OGDR's in multi-mission (NRT) SSH products, and assimilation of the NRT products in global ocean and coastal models

G. Coastal and inland altimetry

The topic of this session is the use of altimeter data to investigate processes at work in the coastal ocean and inland waters. By "inland waters" we include rivers, lakes, estuaries and wetlands; by the "coastal ocean" we mean regions of the ocean next to the coast and extending out to tens to several hundreds of kilometers, over continental shelves of any width. We invite presentations of:
(1) methods used to retrieve and/or analyze altimeter data in these regions, to assess the quality/reliability of the different components entering in the determination of the height/altitude products (range trackers, geophysical corrections, geoid models, etc....);
(2) descriptions of operational systems that use altimeter data, in conjunction with other satellite, in situ and model fields, to address problems of societal concern; and
(3) basic scientific studies that use altimeter data (along with other types of data or model fields) to examine processes affecting inland waters and the coastal ocean.

H. Outreach

In the Outreach splinter session, we will address ongoing projects and past activities related to education and public outreach for all of the ocean surface topography missions. Presentations on specific topics of your interest or involvement are invited. We are especially interested in projects including collaboration with other ocean observing techniques.

In addition, we would like to showcase examples of your products, activities, or results that support ocean altimetry educational or public outreach goals.  Please feel free to include any other relevant information.  A slide template will be made available for your convenience. If session conflicts prevent you from participating in our session, we will be happy to present your slide for you.

Abstract Submission deadline: June 5, 2009

link to Abstract Submission Form