A new retrieval for cloud liquid water path using a ground-based microwaveradiometer and measurements of cloud temperature

Citation
Jc. Liljegren et al., A new retrieval for cloud liquid water path using a ground-based microwaveradiometer and measurements of cloud temperature, J GEO RES-A, 106(D13), 2001, pp. 14485-14500
Citations number
17
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Volume
106
Issue
D13
Year of publication
2001
Pages
14485 - 14500
Database
ISI
SICI code
Abstract
A new method to retrieve cloud liquid water path using 23.8 and 31.4 GHz mi crowave radiometer brightness temperature measurements is developed. This m ethod does not depend on climatological estimates of either the mean radiat ing temperature of the atmosphere T-mr or the mean cloud liquid water tempe rature T-cloud Rather, T-mr is estimated from surface temperature and relat ive humidity measurements, while Tcloud is estimated using millimeter-wave cloud radar data, together with atmospheric temperature profiles obtained f rom either radiosonde or rapid update cycle (RUC) model output. Simulations demonstrate that the new retrieval method significantly reduces the biases in the liquid water path estimates that are apparent in a site-specific re trieval based on monthly stratified, local climatology. An analysis of the liquid water path estimates produced by the two retrievals over four case s tudy days illustrates trends and retrieval performances consistent with the model simulations.