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RTTOV-gb v1.0-updates on sensors, absorption models, uncertainty, and availability

Title
RTTOV-gb v1.0-updates on sensors, absorption models, uncertainty, and availability
Authors
Cimini, DomenicoHocking, JamesDe Angelis, FrancescoCersosimo, AngelaDi Paola, FrancescoGallucci, DonatelloGentile, SabrinaGeraldi, EdoardoLarosa, SalvatoreNilo, SaverioRomano, FilomenaRicciardelli, ElisabettaRipepi, ErmannViggiano, MariassuntaLuini, LorenzoRiva, CarloMarzano, Frank S.Martinet, PaulineSong, Yun YoungAhn, Myoung HwanRosenkranz, Philip W.
Ewha Authors
안명환
SCOPUS Author ID
안명환scopus
Issue Date
2019
Journal Title
GEOSCIENTIFIC MODEL DEVELOPMENT
ISSN
1991-959XJCR Link

1991-9603JCR Link
Citation
GEOSCIENTIFIC MODEL DEVELOPMENT vol. 12, no. 5, pp. 1833 - 1845
Publisher
COPERNICUS GESELLSCHAFT MBH
Indexed
SCIE; SCOPUS WOS scopus
Document Type
Article
Abstract
This paper describes the first official release (v1.0) of RTTOV-gb. RTTOV-gb is a FORTRAN 90 code developed by adapting the atmospheric radiative transfer code RTTOV, focused on satellite-observing geometry, to the ground-based observing geometry. RTTOV-gb is designed to simulate ground-based upward-looking microwave radiometer (MWR) observations of atmospheric downwelling natural radiation in the frequency range from 22 to 150 GHz. Given an atmospheric profile of temperature, water vapor, and, optionally, cloud liquid water content, and together with a viewing geometry, RTTOV-gb computes downwelling radiances and brightness temperatures leaving the bottom of the atmosphere in each of the channels of the sensor being simulated. In addition, it provides the sensitivity of observations to the atmospheric thermodynamical state, i.e., the Jacobians. Therefore, RTTOV-gb represents the forward model needed to assimilate ground-based MWR data into numerical weather prediction models, which is currently pursued internationally by several weather services. RTTOV-gb is fully described in a previous paper (De Angelis et al., 2016), while several updates are described here. In particular, two new MWR types and a new parameterization for the atmospheric absorption model have been introduced since the first paper. In addition, estimates of the uncertainty associated with the absorption model and with the fast parameterization are given here. Brightness temperatures (T-B) computed with RTTOV-gb v1.0 from radiosonde profiles have been compared with ground-based MWR observations in six channels (23.8, 31.4, 72.5, 82.5, 90.0, and 150.0 GHz). The comparison shows statistics within the expected accuracy. RTTOV-gb is now available to licensed users free of charge from the Numerical Weather Prediction Satellite Application Facility (NWP SAF) website, after registration. Coefficients for four MWR instrument types and two absorption model parameterizations are also freely available from the RTTOV-gb support website.
DOI
10.5194/gmd-12-1833-2019
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일반대학원 > 대기과학공학과 > Journal papers
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