Tropospheric Products validation in the GNSS SIRGAS Network

M.V. MACKERN; M.L. MATEO; M. F. CAMISAY; P. A. ROSELL

Workshop; 1st ICCC Workshop 2021; 2021

IAG

Within the weekly processing of the SIRGAS Continuously Operating Network (SIRGAS-CON), latinamerican Analysis Centres operationally estimate tropospheric Zenith Total Delays (ZTD) with an hourly sampling rate. These ZTD are the input data for the weekly SIRGAS combined tropospheric products, computed by the Analysis Centre for the Neutral Atmosphere (CIMA). They are generated and available in daily SINEX TRO files since January 2014, with a latency of 30 days. This contribution presents the latest advances made in the validation of the estimated tropospheric parameters in GNSS stations distributed in the different regions of Latin America. Our results show that the ZTDs estimated at the SIRGAS-CON stations are consistent throughout the region and provide reliable time series of troposphere parameters, which can be used as a reference in future research. The study covers the ZTD and IWV series over a period of 7 years (2014-2020), in GNSS estations distributed from south america, central america and the caribian region.The results are validated using IGS ZTD products at 62 stations and data from 42 radiosondes. Agreement was evaluated in terms of mean bias and rms of the ZTD differences with respect to IGS products (mean bias of -0.75 mm and mean rms of 6.56 mm) and IWV differences with respect to the radiosonde IWV data (mean bias -1.08 kg / m2, mean rms 4.92 kg / m2 and mean standard deviation 2.22 kg / m2).