Global simulation of tropospheric water vapor measurements through the Normalized Differential Spectral Attenuation (NDSA) approach: setup, scintillation model and performance evaluation

L. Facheris; F. Cuccoli; E. Martini; G. Kirchengast; S. Schweitzer

doi:10.1117/12.829618

29 September 2009 Global simulation of tropospheric water vapor measurements through the Normalized Differential Spectral Attenuation (NDSA) approach: setup, scintillation model and performance evaluation

L. Facheris, F. Cuccoli, E. Martini, G. Kirchengast, S. Schweitzer

Author Affiliations +

Proceedings Volume 7475, Remote Sensing of Clouds and the Atmosphere XIV; 74751D (2009) https://doi.org/10.1117/12.829618
Event: SPIE Remote Sensing, 2009, Berlin, Germany

Abstract

NDSA (Normalized Differential Spectral Absorption) was recently proposed as a differential attenuation measurement method to estimate the total content of water vapor (IWV, Integrated Water Vapor) along a tropospheric propagation path between two Low Earth Orbit (LEO) satellites during a relative set/rise (occultation) event. The NDSA approach is based on the simultaneous estimate of the total attenuations at two relatively close frequencies and of a "spectral sensitivity parameter" that can be directly converted into IWV through empirical relationships that can be previously derived based on statistical regressions between spectral sensitivity and IWV simulated through real radiosonde data and a propagation model. In this paper we present the error performance in the IWV profile retrievals in the troposphere (up to 14 km) on the basis of an entire day of occultation events in a ECMWF-model simulated atmosphere. For the first time, we present results of simulations of NDSA measurements made in the millimeter band (in addition to the K_u/K bands analysed in previous works), specifically at 179 and 182 GHz.

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L. Facheris, F. Cuccoli, E. Martini, G. Kirchengast, and S. Schweitzer "Global simulation of tropospheric water vapor measurements through the Normalized Differential Spectral Attenuation (NDSA) approach: setup, scintillation model and performance evaluation", Proc. SPIE 7475, Remote Sensing of Clouds and the Atmosphere XIV, 74751D (29 September 2009); https://doi.org/10.1117/12.829618

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