One type of measurement that will be made during OTREC is total column
precipitable water vapor (PWV) derived from a network of instruments
deployed across Costa Rica. These
measurements of atmospheric moisture content are obtained from the
analysis of the temporal delay of signals between the constellation of
approximately three dozen global navigational satellite system (GNSS)
satellites and ground-based antennas. The network
of GNSS sites around Costa Rica will provide high frequency (~5 minute),
all-weather measurements of PWV throughout OTREC. The spatially dense field of integrated water
vapor over land from these instruments will enable the investigation of propagating
tropical easterly waves and their interaction with the land surface and topography as well as
the diurnal cycle of the land region moisture field. Here,
Dave Adams, a faculty member at Universidad Nacional Autónoma de México and Rani Wiggins, at PhD student Rutgers, are installing one of the
GNSS antennas atop the Universidad de Costa Rica meteorological facility
at Santa Cruz in Guanacaste.
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