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Multi-technique comparisons of 10 years of wet delay estimates on the west coast of Sweden
SMHI, Forskningsavdelningen, Klimatforskning - Rossby Centre.
2012 (Engelska)Ingår i: Journal of Geodesy, ISSN 0949-7714, E-ISSN 1432-1394, Vol. 86, nr 7, s. 565-575Artikel, forskningsöversikt (Refereegranskat) Published
Abstract [en]

We present comparisons of 10-year-long time series of the atmospheric zenith wet delay (ZWD), estimated using the global positioning system (GPS), geodetic very long baseline interferometry (VLBI), a water vapour radiometer (WVR), radiosonde (RS) observations, and the reanalysis product of the European Centre for Medium-Range Weather Forecasts (ECMWF). To compare the data sets with each other, a Gaussian filter is applied. The results from 10 GPS-RS comparisons using sites in Sweden and Finland show that the full width at half maximum at which the standard deviation (SD) is a minimum increases with the distance between each pair. Comparisons between three co-located techniques (GPS, VLBI, and WVR) result in mean values of the ZWD differences at a level of a few millimetres and SD of less than 7 mm. The best agreement is seen in the GPS-VLBI comparison with a mean difference of -3.4 mm and an SD of 5.1 mm over the 10-year period. With respect to the ZWD derived from other techniques, a positive bias of up to similar to 7 mm is obtained for the ECMWF reanalysis product. Performing the comparisons on a monthly basis, we find that the SD including RS or ECMWF varies with the season, between 3 and 15 mm. The monthly SD between GPS and WVR does not have a seasonal signature and varies from 3 to 7 mm.

Ort, förlag, år, upplaga, sidor
2012. Vol. 86, nr 7, s. 565-575
Nyckelord [en]
Zenith wet delay, GPS, Radiosonde, VLBI, Water vapour radiometer, ECMWF
Nationell ämneskategori
Klimatforskning
Forskningsämne
Klimat
Identifikatorer
URN: urn:nbn:se:smhi:diva-455DOI: 10.1007/s00190-011-0527-2ISI: 000305466100006OAI: oai:DiVA.org:smhi-455DiVA, id: diva2:806325
Tillgänglig från: 2015-04-20 Skapad: 2015-04-14 Senast uppdaterad: 2017-12-04Bibliografiskt granskad

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Willen, Ulrika

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