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| Titel |
Forecast indices from a ground-based microwave radiometer for operational meteorology |
| VerfasserIn |
D. Cimini, M. Nelson, J. Güldner, R. Ware |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 1 ; Nr. 8, no. 1 (2015-01-14), S.315-333 |
| Datensatznummer |
250116054
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| Publikation (Nr.) |
 copernicus.org/amt-8-315-2015.pdf |
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| Zusammenfassung |
| Today, commercial microwave radiometer profilers (MWRPs) are robust and
unattended instruments providing real-time, accurate atmospheric observations
at ~ 1 min temporal resolution under nearly all weather
conditions. Common commercial units operate in the 20–60 GHz frequency range
and are able to retrieve profiles of temperature, vapour density, and
relative humidity. Temperature and humidity profiles retrieved from MWRP
data are used here to feed tools developed for processing radiosonde
observations to obtain values of forecast indices (FIs) commonly used in
operational meteorology. The FIs considered here include K index, total
totals, KO index, Showalter index, T1 gust, fog threat, lifted index, S index (STT), Jefferson index, microburst day potential index (MDPI), Thompson index, TQ index, and CAPE (convective available potential energy).
Values of FIs computed from radiosonde and MWRP-retrieved temperature and
humidity profiles are compared in order to quantitatively demonstrate the
level of agreement and the value of continuous FI updates. This analysis is
repeated for two sites at midlatitude, the first one located at low altitude
in central Europe (Lindenberg, Germany) and the second one located at
high altitude in North America (Whistler, Canada). It is demonstrated that
FIs computed from MWRPs well correlate with those computed from radiosondes,
with the additional advantage of nearly continuous updates. The accuracy of
MWRP-derived FIs is tested against radiosondes, taken as a reference, showing
different performances depending upon index and environmental situation.
Overall, FIs computed from MWRP retrievals agree well with radiosonde values,
with correlation coefficients usually above 0.8 (with few exceptions). We
conclude that MWRP retrievals can be used to produce meaningful FIs, with the
advantage (with respect to radiosondes) of nearly continuous updates. |
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