RTTOV-gb v1.0 – updates on sensors, absorption models, uncertainty, and availability
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Published:2019-05-09
Issue:5
Volume:12
Page:1833-1845
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ISSN:1991-9603
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Container-title:Geoscientific Model Development
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language:en
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Short-container-title:Geosci. Model Dev.
Author:
Cimini DomenicoORCID, Hocking James, De Angelis Francesco, Cersosimo Angela, Di Paola Francesco, Gallucci Donatello, Gentile SabrinaORCID, Geraldi Edoardo, Larosa SalvatoreORCID, Nilo SaverioORCID, Romano FilomenaORCID, Ricciardelli Elisabetta, Ripepi ErmannORCID, Viggiano Mariassunta, Luini Lorenzo, Riva Carlo, Marzano Frank S., Martinet Pauline, Song Yun Young, Ahn Myoung HwanORCID, Rosenkranz Philip W.ORCID
Abstract
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 (TB) 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.
Publisher
Copernicus GmbH
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