Programmatic Issues Discussion (Between NASA and CNES)

Surface Water Ocean Topography 4-2 Measurement of ocean mesoscale eddies and their interaction with currents with centimeter level topographic radar interferometry High resolution ocean topographic measurements are important to understanding the ocean heat/energy budget, which is a key variable for climate modeling Surface Water  Determine surface water storage change and discharge to predict the land surface branch of the global hydrologic cycle  Asses the role of fresh water storage as a regulator of the biogeochemical cycle Sea Surface Topography  Measure ocean mesoscale activity, including fronts, eddies and boundary currents and Asses physical-biological interactions  Measure Basin-scale ocean circulation, heat transport, El Nino/La Nina, and sea level rise  Bathymetry  Improve understanding of maritime gravity field and global bathymetry Surface Water  Determine surface water storage change and discharge to predict the land surface branch of the global hydrologic cycle  Asses the role of fresh water storage as a regulator of the biogeochemical cycle Sea Surface Topography  Measure ocean mesoscale activity, including fronts, eddies and boundary currents and Asses physical-biological interactions  Measure Basin-scale ocean circulation, heat transport, El Nino/La Nina, and sea level rise  Bathymetry  Improve understanding of maritime gravity field and global bathymetry - recommended by NRC decadal survey for launch in

Water-HM Meeting CNES HQ, Paris, France Feb 1, 2008 Summary of ongoing activities IIP proposal for Water-HM risk reduction submitted AITT proposal to fly Ka-band altimeter over ice funded (will fly over some surface water targets en route) NASA/JPL investments in radar testbed, including Ka-band capability NASA/JPL mission formulation studies NASA ‘08 funding for first 7 Decadal Survey missions (including SWOT) Continuation in ‘09

Water-HM Meeting CNES HQ, Paris, France Feb 1, 2008 Summary of Issues Division of Responsibilities Amongst Partners (1 hour) Ernesto Rodriguez, Tony Freeman, Jim Graf, CNES a.Summary of ongoing US activities b.Launch vehicle costs in the U.S. are on the order of ~$100M whereas costs are much lower for non-U.S. rockets. Thus, one goal of the technology sharing is to lower overall mission costs. c.ITAR controls will restrict some aspects of the technology and potential sharing arrangements. During the development of the WatER proposal to ESA, some of these details were discussed d.NASA HQ has made it clear that sharing missions is a priority (e.g., Alan Stern presentation at Fall 2007 AGU). e.Work Breakdown (to be completed)

Water-HM Meeting CNES HQ, Paris, France Feb 1, 2008 ITAR Currently all documents presented at joint international meetings have to be cleared individually for ITAR restrictions A TAA is in preparation which will allow easier communication between CNES and JPL (ETC end of April, 2008) Letter Agreement?

Water-HM Meeting CNES HQ, Paris, France Feb 1, 2008 Launch Vehicles After the last of the Delta-II series, there is expected to be a gap in US launch capability in the intermediate range This will occur in the timeframe of the launch of the Water-HM mission, which is expected to be a medium-class mission Alternatives are: 1.Atlas V or Delta IV (shared launch?) 2.Minotaur IV 3.Russian Soyuz Shared launch is not straightforward - few missions are compatible with the 78 deg inclination, 1000 km altitude of Water-HM Some decadal survey missions could (possibly) fit the bill ASCENDS (CO2 laser) GACM (Atmos. Composition) GRACE II

RSDO Option* –Wet Mass: 1033 kg –Payload Mass: ~285 kg –Bus Mass: 579 kg –Propellant Mass: ~43 kg * Mass includes contingency Systems Design From Team X study, April 2006

PRIMA Option* –Wet Mass: 1091kg –Payload Mass: ~285 kg –Bus Mass: ~631 kg –Propellant Mass: ~43 kg NOTE: Difference in mass is due to different Power design, which increases Structures mass *Mass includes contingency Systems Design From Team X study, April 2006

8- Instrument Concept: Instrument Suite Mass Summary I

Current US Launch Vehicle availability for NASA procurement is limited and expensive with a lot of excess capability NASA future Alternative Launch Program current under study may add additional options at lower cost but future is uncertain * Estimates based upon public information Launch Vehicle Assessment and Considerations * Yellow-shaded items indicate marginal feasibility or unavailable

* Estimates based upon public information Foreign Launch Vehicle possibilities are numerous but may be more restricted due to programmatic procurement constraints Launch Vehicle Assessment and Considerations

Cost reduction options to reduce overall mission cost: Additional mission partnering Foreign (non-US) LV Piggyback or host other payloads on S/C Shared launch Orbit selection and requirements driving mass can be considered to lower required launch capability and open up lower cost LV options Mass savings to payload (e.g., AltiKa with integrated radiometer vs Jason nadir altimeter + AMR) may also ease launch vehicle constraints. Launch Vehicle Assessment and Considerations

SWOT Project Key Strawman Milestones & Schedule Schedule Assumptions Project Start: FY ‘10. Launch: FY ‘15. ATLO Duration: 24 months. Schedule independent of the Project partner providing the specific Project element/function. - Instruments - S/C bus - ATLO - Launch vehicle - Mission operations Starting Point for Schedule Development: JPL Team-X SWOT Mission Study, April 2006.

Strawman SWOT Project Key Milestones & Schedule Key Milestone Strawman Dates Activity/Milestone Date Study Start October 2007 Mission Concept Review October 2008 Project Mission System Review October 2009 Preliminary Design Review (PDR) / Technology January 2011 Cutoff Critical Design Review (CDR) August 2011 Subsystem Fab/Test August August 2012 ATLO Start August 2012 ATLO System I&T August April 2014 ATLO Launch Operations April September 2014 Launch September 2014 Launch + 30 days Operations September October 2014 Operations October September 2017

Water-HM Meeting CNES HQ, Paris, France Feb 1, 2008 Work Breakdown (to be completed) NASACNES Project Management Project Systems Engineering Mission Assurance Science Education/Public Outreach Payload Wide-swath altimeter Nadir altimeter Radiometer GPS DORIS Other instrument(s) Spacecraft Bus Ground Data System Mission ops Instrument ops Spacecraft ops Science Data processing Launch Vehicle