Lee-Lueng Fu
Lee-Lueng Fu  Email | Website
Jet Propulsion Laboratory
SWOT Science Leadership
Recent SWOT-related Publications | See All
Seasonality in Transition Scale from Balanced to Unbalanced Motions in the World Ocean (2018)
Dynamic Mapping of Along-track Ocean Altimetry: Method and Performance from Observing System Simulation Experiments (2016)
Reconstructability of Three-dimensional Upper-ocean Circulation from SWOT Sea Surface Height Measurements (2016)
The Challenge of Using Future SWOT Data for Oceanic Field Reconstruction (2016)

Meeting Presentations (83)

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Ocean In-Situ CalVal [presentation]
Fu, L-L. (29-Jun-18)
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The GPS Experiment in the Monterey Bay Campaign [presentation]
Haines, B., Wang, J., and Fu, L-L. (29-Jun-18)
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Scenarios of the Post-Launch Campaign [presentation]
Fu, L-L. (29-Jun-18)
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A Synergistic Approach to SWOT Ocean CalVal [presentation]
Fu, L-L. (29-Jun-18)
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The SWOT Long-Wavelength CalVal Using the On-Board Nadir Altimeter [presentation]
Wang, J. and Fu, L-L. (29-Jun-18)
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A Pair of Notional SWOT Science Campaigns [presentation]
Farrar, T., Fu, L-L., Morrow, R., and d'Ovidio, F. (28-Jun-18)
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Oceanography Breakout Session Summaries [presentation]
Oceanography Leads (28-Jun-18)
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Progress Toward Variational Assimilation of SWOT Data [presentation]
Cornuelle, B., Gille, S., Fu, L-L., Gopalakrishnan, G., Heimbach, P., Kachelein, L., Li, Z., Mazloff, M., Peralta, H.V., Verdy, A., Villas Boas, B., and Wang, J. (27-Jun-18)
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On the Spatial Resolution of the Future SWOT SSH Measurements [presentation]
Wang, J., Fu, L-L., Torres Gutierrez, H., Chen, S., Menemenlis, D., and Qiu, B. (26-Jun-18)
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Meeting Objectives [presentation]
Fu, L-L., Morrow, R., Cretaux, J-F., and Pavelsky, T. (26-Jun-18)
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Ocean Simulator for Science Applications [presentation]
Ubelmann, C., Gaultier, L., Fu, L-L., Wang, J., Steunou, N., Picot, N., and Dibarboure, G. (26-Jun-18)
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Cal/Val Introduction [presentation]
Chen, C., Desai, S., Fu, L-L., Morrow, R., and Picot, N. (29-Jun-17)
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In-Situ Ocean Cal/Val Observing System [presentation]
Fu, L-L. (29-Jun-17)
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SWOT Ocean In-Situ Cal/Val: An OSSE Study [presentation]
Wang, J., Fu, L-L., Qiu, B., Menemenlis, D., Farrar, T., Chao, Y., Thompson, A.F., and Flexas, M.M. (29-Jun-17)
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An Ocean Data Assimilation System for the CalVal [presentation]
Li, Z., Wang, J., and Fu, L-L. (29-Jun-17)
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SWOT Science Oceanographic Field Campaigns [presentation]
Farrar, T., Fu, L-L., Morrow, R., Drushka, K., Rainville, L., d'Ovidio, F., Girton, J., and Chao, Y. (29-Jun-17)
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Ocean Simulator for Science Applications [presentation]
Ubelmann, C., Gaultier, L., Fu, L-L., and Wang, J. (27-Jun-17)
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Spatial and Seasonal Distribution of Internal Gravity Waves and Balanced Motions in the Global Ocean [presentation]
Klein, P., Torres, H., Menemenlis, D., Qiu, B., Wang, J., Fu, L-L., Su, Z. (27-Jun-17)
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On a Dynamical Separation of Waves and Balanced Motions Based on Surface Measurements [presentation]
Wang, J., Fu, L-L., and Klein, P. (27-Jun-17)
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Ocean Keynote Presentation: The Problem of Separating Geostrophic Balanced Flow from Ageostrophic Motions - Model and Data Perspectives [presentation]
Qiu, B., Chen, S., Klein, P., Wang, J., Fu, L-L., Menemenlis, D. and Nakano, T. (26-Jun-17)
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Meeting Objectives [presentation]
Morrow, R., Fu, L-L., and Pavelksy, T. (26-Jun-17)
Poster
Designing an In-situ Observing System for the CalVal of the SWOT Sea-surface Height Measurement [poster]
Wang, J. and Fu, L-L. (13-Dec-16). The future SWOT satellite will be able to measure a two-dimensional swath of sea surface height (SSH) by carrying a radar interferometer. One of the grand challenges of the SWOT mission is the calibration and validation (Cal/Val) of satellite measurements. The purpose of this study to design an in-situ observing system for the SWOT ocean Cal/Val, to validate the SSH measurement error wavenumber spectrum.
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Oceanography from the SWOT Mission: Opportunities and Challenges [presentation]
Fu, L-L. and Morrow, R. (13-Dec-16). The primary instrument of SWOT is a Ka-band radar interferometer for measuring the elevation of water surface over land and ocean. The oceanographic objectives of the mission are to observe sea surface height at scales approaching 15 km, depending on the sea state. The measurement technique and the development of the mission will be presented with an emphasis on its science program with an outlook on the opportunities and challenges.
Poster not available
Seasonality and Intermittency of the Ocean Dynamics at Scales Smaller than 100 km in the World Ocean: A Scientific Challenge for SWOT [poster]
Su, Z., Wang, J., Klein, P., Thompson, A.F., Menemenlis, D., and Fu, L-L. (13-Dec-16). In this presentation, we discuss the consequences and the challenges posed by the strong spatial and temporal variability to SWOT data analysis.
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Submesoscale Transition from Geostrophic Flows to Internal Waves in ADCP Data and 1/48-deg MITcgm: Implications for SWOT Mission [presentation]
Qiu, B., Nakano, T., Chen, S., Klein, P., Wang, J., Fu, L-L., and Menemenlis, D. (13-Dec-16). With the use of Ka-band radar interferometry, the SWOT satellite will improve the measured sea surface height resolution down to the spectral wavelength of 15km, allowing us to investigate for the first time the upper ocean circulation variability at the submesoscale range on the global scale. By analyzing repeat shipboard Acoustic Doppler Current Profiler measurements along 137°E, as well as the 1/48-deg MITgcm simulation output, in the northwest Pacific, we demonstrate that the observed/modeled upper ocean velocities are comprised of balanced geostrophic motions and unbalanced ageostrophic wave motions.
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A Model Framework for Evaluating In-situ Measurement to Estimate Synoptic SSH [presentation]
Wang, J. and Fu, L. (16-Jun-16)
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Challenges for In-Situ Cal/Val from Space-Time Variability [presentation]
Farrar, T., Wang, J., Fu, L., Savage, A., and Arbic, B. (16-Jun-16). SWOT along-track sampling will be effectively synoptic. The along-track wavenumber spectrum needs to be validated. The high-frequency variability of the SSH field at small spatial scales (20-100km) will make it difficult to use some conventional in situ measurement approaches for cal/val - we will need some spatial arrays of instruments for synoptic sampling. View the animation embedded on Slide 7 of this presentation.
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SWOT Requirements and SSH Measurements from Altimetric and In-Situ Observations [presentation]
Fu, L. and Morrow, R. (16-Jun-16)
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High-level Products and Reconstruction Techniques for SWOT [presentation]
Ubelmann, C., Fu, L., Klein, P., Cornuelle, B., Dibarboure, G., Roge, M., Morrow, R., and Gaultier, L. (15-Jun-16)
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Meeting Overview [presentation]
Fu, L-L. (13-Jun-16)
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Mission Orbit and Phases [presentation]
Fu, L-L. and Pavelsky, T. (13-Jun-16). The 21-day science orbit presents challenges from temporally irregular sampling. The number of overflights in one 21-day cycle varies from one to two closely separate samples at low latitudes to a 10-day subcycle at the mid latitudes, to more than 3 at high latitudes. The 90-day cal/val phase will have a 1-day fast sampling orbit. View the animation embedded on Slide 4 of this presentation.
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Ocean Simulator for Science Applications [presentation]
Ubelmann, C., Gaultier, L., Fu, L., and Wang, J. (13-Jun-16). The need for a light/portable tool to easily simulate SWOT L2 data with realistic sampling and error/noise was pointed during the last Science Team Meeting. The SWOT simulator for ocean science relies on spectral error budget specifications from the project team. View the animation embedded on Slide 12 of this presentation.
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Ocean Objectives of the 1-day Repeat Phase [presentation]
Fu, L-L. (09-Jul-15)
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Summary & Final Discussion [presentation]
Fu, L-L., Morrow, R., Cretaux, J-F., Pavelsky, T. (09-Jul-15)
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Impact on Ocean & Non-oceanic Surfaces [presentation]
Morrow, R., Picot, N., Rodriguez, E., and Fu, L-L. (08-Jul-15)
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SWOT Simulator for Ocean Science [presentation]
Ubelmann, C., Gaultier, L., and Fu, L-L. (08-Jul-15)
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Discussion of SWOT Ocean Expert Data Product [presentation]
Farrar, T., Dibarboure, G., Steunou, N., Gille, S., Callahan, P., Rodriguez, E., Morrow, R., and Fu, L-L. (08-Jul-15)
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Proposed Modifications to Science Requirements Regarding Ocean Data Products [presentation]
Farrar, T., Dibarboure, G., Gille, S., Steunou, N., Morrow, R., Fu, L-L., and Rodriguez, E. (08-Jul-15)
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SWOT Ocean Objectives [presentation]
Fu, L-L. and Morrow, R. (07-Jul-15)
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Issues in Data Downlink to Maximize the Mission’s Return [presentation]
Fu, L-L. (07-Jul-15)
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Issues for 250 m vs 1 km Posting of Low Rate (LR) Resolution [presentation]
Fu, L-L. and Morrow, R. (07-Jul-15)
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SWOT Simulator for Ocean Science [presentation]
Ubelmann, C., Gaultier, L., and Fu, L-L. (14-Jan-15)
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Meso/submesoscale Dynamics in the Upper Ocean: Recent Results and Important Questions [presentation]
Klein, P., Qiu, B., Fu, L-L., and Morrow, R. (14-Jan-15)
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Dynamic Interpolation Techniques Applied to SWOT Altimetry Data [presentation]
Ubelmann, C., Fu, L-L., Klein, P., and Cornuelle, B. (14-Jan-15)
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Meeting Overview [presentation]
Fu, L-L. (13-Jan-15)
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Objectives of the 1-day Repeat Phase [presentation]
Fu, L-L. (13-Jan-15)
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Potential Perspectives of a Dynamic Interpolation Scheme for SWOT [presentation]
Ublemann, C., Fu, L-L., and Klein, P. (16-Jan-14)
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Ocean Summary & Recommendations [presentation]
Morrow, R. and Fu, L-L. (16-Jan-14)
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Oceanographic Studies for the SWOT Project [presentation]
Fu, L-L. (14-Jan-14)
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Multi-Scale Surface Ocean Circulation Variability and Interactions: Roles of SWOT and Nadir-Looking Altimetry [presentation]
Qiu, B., Klein, P., Chen, S., Fu, L-L., and Sasaki, H. (14-Jan-14)
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Overview of Meeting [presentation]
Fu, L-L. (14-Jan-14)
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Near-term Actions for the SDT [discussion]
Fu, L-L. (30-Jan-13)
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Meeting Wrap-up and Conclusions [discussion]
Fu, L-L. (30-Jan-13)
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Welcome/Introduction [discussion]
Fu, L-L. (28-Jan-13)
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Science Requirements, SDT Charter and Meeting Objectives [presentation]
Fu, L-L. (28-Jan-13)
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Recent SWOT Activities & Schedule [presentation]
Fu, L-L. (17-Oct-11)
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Fast Sampling Phase [presentation]
Fu, L-L., Morrow, R., and Rodriguez, E. (17-Oct-11)
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Nadir Altimeter for SWOT [presentation]
Fu, L-L., Morrow, R., and Rodriguez, E. (17-Oct-11)
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Cross-track Variability of Water Vapor Over the Ocean [presentation]
Fu, L-L., Brown, S., Stum, J., Obligis, E., and Mallet, A. (17-Oct-11)
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Discussion Points [presentation]
Fu, L-L. (17-Oct-11)
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Welcome to the SWOT Science Working Group Meeting [discussion]
Alsdorf, D., Fu, L-L., Mognard, N., and Morrow, R. (24-Sep-10)
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Previous Altimetry Missions and Science Teams [presentation]
Fu, L-L. (24-Sep-10)
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Welcome to the SWOT Science Working Group Meeting [presentation]
Alsdorf, D., Fu, L-L., Mongard, N., and Morrow, R. (23-Sep-10)
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A Brief History of SWOT [presentation]
Fu, L-L. (23-Sep-10)
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The SWOT Ocean On-Board Processor [presentation]
Esteban-Fernandez, D., Rodriguez, E., Peral, E., Clark, D., and Fu, L-L. (23-Sep-10)
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SWOT Short & Longterm Goals - Oceanographic Science Goals [presentation]
Morrow, R. and Fu, L-L. (23-Sep-10)
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Introduction [discussion]
Ful, L-L. (01-Mar-10)
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Objectives and Requirements of SWOT for Observing the Oceanic Mesoscale Variability [presentation]
Fu, L-L. and Shum, C.K. (15-Sep-08)
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Background of SWOT Opportunities and Science Challenges [presentation]
Fu, L-L. (28-Apr-08)
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IIP WATER HM Proposal [presentation]
Fu, L-L. and Rodriguez, E. (01-Feb-08)
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Hydrology and Oceanography Science Questions [discussion]
Alsdorf, D., Fu, L-L., Menard, Y., and Mongard, N. (01-Feb-08)
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Wording and Prioritization of the Science Questions [discussion]
Alsdorf, D., Fu, L-L., Menard, Y., and Mongard, N. (01-Feb-08)
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Discussion and Finalize Decisions 3 and 4 - Issues of Rain Rates and Ka-band vs. Ku-band [discussion]
Alsdorf, D., Fu, L-L., Mongard, N., and Morrow, R. (30-Oct-07)
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Mission Timelines and Funding Availability [discussion]
Alsdorf, D., Fu, L-L., Mongard, N., and Morrow, R. (30-Oct-07)
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Terms of Reference for the WATER HM Science Working Group [presentation]
Fu, L-L. (29-Oct-07)
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Oceanography Science Questions [presentation]
Fu, L-L. (29-Oct-07)
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Report of Break-Out Session Findings, Discussion and Finalize Decisions 1 and 2 [presentation]
Alsdorf, D., Fu, L-L., Mongard, N., and Morrow, R. (29-Oct-07)
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Physical Oceanography [presentation]
Fu, L-L. (25-Jul-07)
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International Joint-Science Working Group [presentation]
Fu, L-L. and Menard, Y. (25-Jul-07)
Discussion to Form Consensus on Science Thrusts & Requirements [discussion]
Fu, L-L. and Alsdorf, D. (31-Oct-06)
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Discussion to Form Consensus on Mission Orbits & Data Requirements [discussion]
Fu, L-L. and Alsdorf, D. (31-Oct-06)
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Welcome and Opening Remarks [presentation]
Fu, L-L. and Alsdorf, D. (30-Oct-06)
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Mapping Ocean Surface Topography with a Synthetic-Aperture Interferometry Radar - A Global Hydrosphere Mapper [presentation]
Fu, L-L. (30-Oct-06)

Publications (9)

Qiu, B., Chen, S., Klein, P., Wang, J., Torres, H., Fu, L-L., and Menemenlis, D. (2018). Seasonality in Transition Scale from Balanced to Unbalanced Motions in the World Ocean, J. Phys. Oceanogr., 48, 591-605. doi:10.1175/JPO-D-17-0169.1.
Ubelmann, C., Cornuelle, B., and Fu, L.-L. (2016). Dynamic Mapping of Along-track Ocean Altimetry: Method and Performance from Observing System Simulation Experiments, J. Atmos. Ocean. Tech., 33, 1691-1699, doi: 10.1175/jtech-d-15-0163.1.
Qiu, B., Chen, S., Klein, P., Ubelmann, C., Fu, L-L., and Sasaki, H. (2016). Reconstructability of Three-dimensional Upper-ocean Circulation from SWOT Sea Surface Height Measurements, J. Phys. Oceanogr., 46, 947- 963, doi: 10.1175/JPO-D-15-0188.1.
Gaultier, L., Ubelmann, C., and Fu, L-L. (2016). The Challenge of Using Future SWOT Data for Oceanic Field Reconstruction, J. Ocean. Atm. Tech., 33, 119-126, doi: 10.1175/JTECH-D-15-0160.1.
Ubelmann, C., Klein, P., and Fu, L-L. (2014). Dynamic Interpolation of Sea Surface Height and Potential Applications for Future High-Resolution Altimetry Mapping, J. Atmos. Oceanic Technol., 32, 177-184, doi: 10.1175/JTECH-D-14-00152.1.
Durand, M., Fu, L-L., Lettenmaier, D.P., Alsdorf, D., Rodríguez, E., and Esteban-Fernandez, D. (2010). The Surface Water and Ocean Topography Mission: Observing Terrestrial Surface Water and Oceanic Submesoscale Eddies, Proceedings of the IEEE, 98(5), 766-779, doi: 10.1109/JPROC.2010.2043031.
Fu, L-L., Alsdorf, D., Rodríguez, E., Morrow, R., Mognard, N., Lambin, J., Vaze, P., and Lafon, T. (2009). The SWOT (Surface Water and Ocean Topography) Mission: Spaceborne Radar Interferometry for Oceanographic and Hydrological Applications, Proceedings of OceanObs'09: Sustained Ocean Observations and Information for Society (Vol. 2), Venice, Italy, 21-25 September 2009, Hall, J., Harrison, D.E. & Stammer, D., Eds., ESA Publication WPP-306, doi: 10.5270/OceanObs09.cwp.33.
Fu, L-L. and Ferrari, R. (2008). Observing Oceanic Submesoscale Processes from Space, Eos Trans. AGU, 89(48), 488-488, doi: 10.1029/2008EO480003.
Alsdorf, D., Fu, L-L., Mognard, N., Cazenave, A., Rodríguez, E., Chelton, D., and Lettenmaier, D. (2007). Measuring Global Oceans and Terrestrial Freshwater from Space, Eos Trans. AGU, 88(24), 253-257, doi:10.1029/2007EO240002.

Documents (5)

SWOT: Tracking Water on Earth from Mountains to the Deep Sea
Lee-Leung Fu (30-Nov-16). An introduction to SWOT provided by Project Scientist Lee-Lueng Fu.
SWOT Simulator for Ocean Science
Ubelmann, C., Gaultier, L., and Fu, L-L. (22-Aug-16). This software simulates SWOT observations of sea surface height (SSH) that can be applied to an ocean general circulation model (OGCM), allowing the exploration of ideas and methods to optimize information retrieval from the SWOT Mission in the future. From OGCM SSH inputs, the software generates SWOT-like outputs on a swath along the orbit ground track and adds measurement error and noise, which are generated according to technical characteristics published by the SWOT project team. Not designed to directly simulate the payload instrument performance, this SWOT simulator aims at providing statistically realistic outputs for the science community with a simple software package released as an open source in Python. The software is scalable and designed to support future evolution of orbital parameters, error budget estimates from the project team and suggestions from the science community. View the full manual. Download example data
(ZIP, 422 MB)
.
Mesoscale / Sub-mesoscale Dynamics in the Upper Ocean
Klein, P., Morrow, R., Samelson, R., Chelton, D., Lapeyre, G., Fu, L., Qiu, B., Ubelmann, C., Le Traon, P-Y., Capet, X., Ponte, A., Sasaki, H., d'Ovidio, F., Farrar, T., Chapron, B., D'Asaro, E., Ferrari, R., McWilliams, J., Smith, S., and Thompson, A. (18-Mar-15). This white paper mainly addresses some of the potential general science questions that can be addressed from the SSH signals observable with SWOT.
SWOT Mission Science Document
Fu, L-L., Alsdorf, D., Morrow, R., Rodrigues, E., and Mognard, N. [eds]. (01-Feb-12). In October 2007, a SWOT Science Working Group (SWG) was formed under the auspices of NASA and CNES with participants from the international communities of oceanography and land surface hydrology. The SWG was charged to provide scientific guidance for the development of the mission, including science objectives and requirements, science payload, orbit selection, and data products. Since the inaugural meeting in October 2007, the SWG has met eight times. Additionally, a town hall meeting on SWOT was held in the 2008 American Geophysical Union (AGU) Fall Meeting. This document summarizes the findings from these meetings with a purpose to provide information on the potential opportunities in science investigation and applications as well as on the preliminary design of the SWOT mission concept.
Decadal Survey Mission Development: SWOT
Lindstrom, E., Neeck, S., Vaze, P., Rodriguez, E., Fu, L-L., Morrow, R., Alsdorf, D., and Mognard, N. (11-Feb-09). Presentation on the Surface Water and Ocean Topography (SWOT) Mission presented at the Decadal Survey Mission Development Symposium in 2009. This talk provides background and proposed plans for the SWOT mission.