Radio Occultation Climate Records

Project Description
The objective of the proposed effort is to create a long-term, consistent, calibrated GPS radio occultation (RO) data record spanning 18 years, from 1995 to 2013. This effort is urgently needed by the Earth science community and by projects within the Earth Science Data Systems (ESDS) program. The Decadal Survey for Earth Science has identified radio occultation as a critical measurement for observing decadal-scale climate change and has recommended RO for the CLARREO mission. The Climate Virtual Observatory Project within ESDS is using RO to recalibrate AIRS, AMSU and MODIS. Both of these projects require well-calibrated RO records: CVO requires 0.1 K temperature accuracy, and CLARREO requires 0.03% fractional refractivity accuracy. This level of calibration accuracy has not yet been achieved for RO measurements. We present a detailed plan to push the state-of-the-art in RO uncertainty analysis, and develop algorithms that correct the retrievals themselves so that they are accurate to 0.1 K and 0.03%. We will apply these algorithms to the RO data spanning 18 years, from GPS/MET through to the present COSMIC era. A calibrated RO data set will be distributed to the Earth science community, including CVO researchers, for their free use. Project PI: Anthony Mannucci/Jet Propulsion Laboratory Jet Propulsion Laboratory/California Institute of Technology, M/S 238 - 600 4800 Oak Grove Dr., Altadena, CA 91001, United States Email:
Project Administrator(s):
Cristina Milesi


Cristina Milesi