Validation of ground-based microwave radiometer measurements over a tropical coastal station

Renju, R and Raju, Suresh and Davis, EV and Mathew, N and Moorthy, KK (2019) Validation of ground-based microwave radiometer measurements over a tropical coastal station. In: 2019 URSI Asia-Pacific Radio Science Conference, AP-RASC 2019, 9 March 2019-15 March 2019, New Delhi.

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Abstract

Ground-based, passive, multi-frequency microwave radiometer profilers (MRP) are very powerful tools to provide vertical profiles of atmospheric parameters under almost all-weather conditions. However, these retrievals are to be validated through other independent estimates, before these are used for scientific studies. Such a validation exercise has been carried out for the MRP, operational at the tropical coastal station, Thiruvananthapuram (TVM), which has been in regular operation since 2010. The validation is done through the inter-comparison of the MRP measured brightness temperature (Tb) with those simulated using microwave radiative transfer scheme that uses collocated and concurrent profiles of temperature and humidity from radiosonde. The analyses have shown a very good correlation (∼0.9) with 0.5 K bias for V-band frequency channels while for the K-band frequency channels a 3-5 K bias is seen due to the variability in the water vapour content. The direct comparison of retrieved relative humidity with those derived from radiosonde measurements, yielded good agreement below 8 km altitude.

Item Type:	Conference Paper
Publication:	2019 URSI Asia-Pacific Radio Science Conference, AP-RASC 2019
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc
Keywords:	Atmospheric humidity; Coastal engineering; Microwave devices; Radiometers; Radiosondes; Tropics, Atmospheric parameters; Brightness temperatures; K-band frequencies; Microwave radiometer profilers; Microwave radiometers; Radiosonde measurements; Regular operations; Temperature and humidities, Microwave measurement
Department/Centre:	Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited:	30 Nov 2022 09:39
Last Modified:	30 Nov 2022 09:39
URI:	https://eprints.iisc.ac.in/id/eprint/78305

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