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Statements

Subject Item
n2:RIV%2F68378289%3A_____%2F14%3A00427625%21RIV15-GA0-68378289
rdf:type
n15:Vysledek skos:Concept
dcterms:description
Reanalysis data are very useful for studying the stratosphere. In this paper, we mutually compare three of them, ERA-40, ERA-Interim and NCEP/NCAR, and compare them with balloon radiosonde observations from Prague. This comparison is done for wind speed and direction at pressure levels 100 and 10 hPa and for various periods between 1957 and 2009. The results show that the differences between reanalysis vary. Wind speed data from all three analyses reasonably agree except for the 10 hPa historical data before 1966 and particularly ERA-40 data at the end of the data series (1998–2001). The quality of the ERA-40 10 hPa stratospheric wind data has been proven to be substantially worse over the last four ERA-40 years of 1998–2001 (2002) compared to previous years, both in wind speed and wind direction. The reanalysis data results are compared with radiosonde observations from Prague at 10 hPa for the months of February between 1989 and 2009. The results show that there are sometimes surprisingly large differences, more for ERA-Interim versus Prague measurements. Differences in wind direction greater than 45o (outliers) between the reanalysis data and Prague observations in wind direction occur in Februaries predominantly when winds in Prague are in “minor sectors, such as north, northeast and east (easterlies), whereas “major sectors, particularly the dominant W (westerlies) wind sector, exhibit almost no outliers. Reanalysis data are very useful for studying the stratosphere. In this paper, we mutually compare three of them, ERA-40, ERA-Interim and NCEP/NCAR, and compare them with balloon radiosonde observations from Prague. This comparison is done for wind speed and direction at pressure levels 100 and 10 hPa and for various periods between 1957 and 2009. The results show that the differences between reanalysis vary. Wind speed data from all three analyses reasonably agree except for the 10 hPa historical data before 1966 and particularly ERA-40 data at the end of the data series (1998–2001). The quality of the ERA-40 10 hPa stratospheric wind data has been proven to be substantially worse over the last four ERA-40 years of 1998–2001 (2002) compared to previous years, both in wind speed and wind direction. The reanalysis data results are compared with radiosonde observations from Prague at 10 hPa for the months of February between 1989 and 2009. The results show that there are sometimes surprisingly large differences, more for ERA-Interim versus Prague measurements. Differences in wind direction greater than 45o (outliers) between the reanalysis data and Prague observations in wind direction occur in Februaries predominantly when winds in Prague are in “minor sectors, such as north, northeast and east (easterlies), whereas “major sectors, particularly the dominant W (westerlies) wind sector, exhibit almost no outliers.
dcterms:title
Differences in mid-latitude stratospheric winds between reanalysis data and versus radiosonde observations at Prague Differences in mid-latitude stratospheric winds between reanalysis data and versus radiosonde observations at Prague
skos:prefLabel
Differences in mid-latitude stratospheric winds between reanalysis data and versus radiosonde observations at Prague Differences in mid-latitude stratospheric winds between reanalysis data and versus radiosonde observations at Prague
skos:notation
RIV/68378289:_____/14:00427625!RIV15-GA0-68378289
n3:aktivita
n11:P n11:I
n3:aktivity
I, P(GAP209/10/1792), P(LD12070)
n3:cisloPeriodika
4
n3:dodaniDat
n8:2015
n3:domaciTvurceVysledku
n13:7020139 n13:9492933 n13:7701950
n3:druhVysledku
n10:J
n3:duvernostUdaju
n17:S
n3:entitaPredkladatele
n14:predkladatel
n3:idSjednocenehoVysledku
11432
n3:idVysledku
RIV/68378289:_____/14:00427625
n3:jazykVysledku
n18:eng
n3:klicovaSlova
meteorology; atmospheric dynamics; middle atmosphere dynamics
n3:klicoveSlovo
n9:meteorology n9:middle%20atmosphere%20dynamics n9:atmospheric%20dynamics
n3:kodStatuVydavatele
DE - Spolková republika Německo
n3:kontrolniKodProRIV
[27C7410CAC1E]
n3:nazevZdroje
Annales Geophysicae
n3:obor
n12:DG
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
3
n3:projekt
n5:LD12070 n5:GAP209%2F10%2F1792
n3:rokUplatneniVysledku
n8:2014
n3:svazekPeriodika
32
n3:tvurceVysledku
Laštovička, Jan Križan, Peter Kozubek, Michal
n3:wos
000337946900003
s:issn
0992-7689
s:numberOfPages
14
n16:doi
10.5194/angeo-32-353-2014