On the use of water vapour radiometry for assessment of wet delay estimates from space geodetic techniques

Paper i proceeding, 2023

We have studied the impact of liquid water
drops in the atmosphere on the retrieval accuracy of
the wet propagation delay using microwave radiometry
through a comparison with the corresponding results
from ground-based GPS observations. Using all
data available acquired at the Onsala Space Observatory
during 2022 we find, as expected, the best agreement
for the conditions with no, or a very small, liquid
water content (LWC). For the LWC interval 0.0–0.1mm
the bias and the standard deviation of the equivalent
zenith wet delay (ZWD) agreement between the WVR
and the GPS estimates are 3.3mmand 4.2 mm, respectively.