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Quality Control, Error Analysis, and Impact Assessment of FORMOSAT-3/COSMIC in Numerical Weather Prediction

2009; Springer Nature; Volume: 20; Issue: 1 Linguagem: Inglês

10.3319/tao.2008.01.21.02(f3c)

2311-7680

Paul Poli, Patrick Moll, Dominique Puech, Florence Rabier, S. B. Healy,

GNSS positioning and interference

AB STRACTFol low ing sev eral years of ex per i men ta tion with the GPS ra dio occultation tech nique, the 6-sat el lite FORMOSAT-3/ COS MIC (F3C) mis sion was launched mid-2006 and has been col lect ing data since then.In this pa per we pres ent early find ings of re search per formed at Météo-France re gard ing the use of these data for as sim i la tion in nu mer i cal weather pre dic tion.Ben e fit ing from the dense global cov er age al lowed by F3C re frac tion-in duced ob ser va tions, we first as sess the qual ity of these data at four lev els: bend ing an gle, refractivity, refractivity lapse rate, and tem per a ture.We com pare them with cal cu la tions from Météo-France nu mer i cal weather fore casts.Learn ing from these var i ous lev els of data we de vise qual ity con trol pro ce dures that rely on the refractivity lapse rate.Ap ply ing a re cent meth od ol ogy de vel oped in data as sim i la tion we cal cu late ob ser va tion bend ing an gle er ror vari ances for our as sim i la tion sys tem.Us ing these new qual ity con trol pro ce dures and ob ser va tion er ror es ti mates we run an as sim i la tion and fore cast ex per i ment with Météo-France's op er a tional global 4DVAR data as sim i la tion sys tem used as a ref er ence.Our re sults in di cate a very clear pos i tive im pact of the as sim i la tion of F3C bend ing an gle data in the South ern hemi sphere for the pre dic tion of geopotential heights and winds.We also ob serve an improvement in wind forecast skill in the Northern hemisphere, albeit such an improvement is smaller than in the Southern hemisphere.