Naslov
Validation of monthly wind fields derived from GPS radio occultation data

Autori
Nimac, Irena ; Danzer, Julia ; Kirchengast, Gottfried

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
International Workshop on Occultations for Probing Atmosphere and Climate 2022 / - , 2022, 1-1

Skup
International Workshop on Occultations for Probing Atmosphere and Climate 2022

Mjesto i datum
Leibnitz, Austrija, 08.09.2022. - 14.09.2022

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
radio occultations, wind fields

Sažetak
For the purposes of detailed horizontal and vertical wind field analysis, monthly-mean wind fields were derived from radio occultation (RO) measurements. The wind fields were validated in comparison with European Centre for Medium-Range Weather Forecasts ERA5 reanalysis data.For estimating wind fields outside of the tropics, the geostrophic wind approximation was used. In equatorial regions, due to the Quasi-Biennial Oscillation, thermal wind balance could be used to estimate mean (zonal) stratospheric winds. For both approximations, wind fields were derived from monthly-mean geopotential height fields on isobaric surfaces with 2.5°x2.5° horizontal resolution, in the period from 2007 to 2020.We examined the geographic and vertical range of validity of both approximations for wind field derivation by inter-comparing to the ‘true’ ERA5 wind data. Evaluating the systematic and random aspects of differences, we investigated in which regions the RO-derived geostrophic and thermal wind balances hold reasonably well (within ±2 m/s accuracy) and otherwise break down. Also, a long-term data record validation between RO and ERA5 winds was performed, analyzing the consistency of the approximate and ‘true’ wind fields at the decadal time scale

Izvorni jezik
Engleski

Znanstvena područja
Geofizika

POVEZANOST RADA