Joint Session 50 Early On-Orbit Results of the Cyclone Global Navigation Satellite System (CYGNSS)

Thursday, 11 January 2018: 10:30 AM-12:00 PM
Ballroom G (ACC) (Austin, Texas)
Hosts: (Joint between the 22nd Conference on Satellite Meteorology and Oceanography; and the 22nd Conference on Integrated Observing and Assimilation Systems for the Atmosphere, Oceans, and Land Surface (IOAS-AOLS) )
Christopher Ruf, Univ. of Michigan, Atmospheric, Oceanic and Space Sciences, Ann Arbor, MI and Zhaoxia Pu, Univ. of Utah, Atmospheric Sciences Modeling and Predictability Research Group, Salt Lake City, UT

The CYGNSS constellation of eight satellites was successfully launched on 15 December 2016 into a low inclination (tropical) Earth orbit. Each satellite carries a four-channel bi-static radar receiver that measures GPS signals scattered by the ocean, from which ocean surface roughness, near-surface wind speed, and air–sea latent heat flux are estimated. The measurements are unique in several respects, most notably in their ability to penetrate through all levels of precipitation, made possible by the low frequency at which GPS operates, and in the frequent sampling of tropical cyclone intensification and of the diurnal cycle of winds, made possible by the large number of satellites. Engineering commissioning of the constellation was successfully completed in March 2017 and the mission is currently in the early phase of science operations.   Level 2 science data products have been developed for near-surface (10 m referenced) ocean wind speed, ocean surface roughness (mean square slope), and latent heat flux. Level 3 gridded versions of the L2 products have also been developed. A set of Level 4 products have also been developed specifically for direct tropical cyclone overpasses. These include the storm intensity (peak sustained winds) and size (radius of maximum winds), its extent (34, 50, and 64 knot wind radii), and its integrated kinetic energy. Assimilation of CYGNSS L2 wind speed data into the HWRF hurricane weather prediction model has also been developed. Early on-orbit scientific results by the mission science team and others will presented.

10:30 AM
NASA CYGNSS Mission Overview
Christopher S. Ruf, Univ. of Michigan, Ann Arbor, MI; and R. Balasubramaniam, S. Gleason, Z. Jelenak, D. McKague, A. O'Brien, F. Said, and S. Soisuvarn
10:45 AM
11:00 AM
CYGNSS Science Highlights from the First Year on Orbit
Derek J. Posselt, JPL, Pasadena, CA; and C. S. Ruf, R. Atlas, N. L. Baker, D. Burrage, J. A. Crespo, J. T. Johnson, T. J. Lang, X. Li, E. D. Maloney, D. McKague, M. Morris, Z. Pu, E. Riley Dellaripa, and D. E. Waliser

11:30 AM
A 2DVAR Mapping Method of CYGNSS Wind Speed Observations
Xiaochun Wang, Univ. of California, Los Angeles, Los Angeles, CA; and Z. Li, Y. Yi, C. K. Shum, and J. Johnson
11:45 AM
Assimilation of CYGNSS Ocean Surface Wind Speeds with NCEP GSI-Based Ensemble-Variational Data Assimilation Systems
Zhaoxia Pu, Univ. of Utah, Salt Lake City, UT; and Z. Cui, V. Tallapragada, C. S. Ruf, and R. Atlas
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