Modes of Atmospheric Circulation Variability in the Northern Extratropics: A Comparison of Five Reanalyses
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F20%3A00559268" target="_blank" >RIV/68378289:_____/20:00559268 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11310/20:10417094
Result on the web
<a href="https://journals.ametsoc.org/view/journals/clim/33/24/jcliD190904.xml" target="_blank" >https://journals.ametsoc.org/view/journals/clim/33/24/jcliD190904.xml</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1175/JCLI-D-19-0904.1" target="_blank" >10.1175/JCLI-D-19-0904.1</a>
Alternative languages
Result language
angličtina
Original language name
Modes of Atmospheric Circulation Variability in the Northern Extratropics: A Comparison of Five Reanalyses
Original language description
Modes of low-frequency circulation variability in the Northern Hemisphere extratropics are compared between five reanalyses. Circulation modes are detected by rotated principal component analysis (PCA) of monthly mean 500-hPa geopotential heights between 1957 and 2002, separately for individual seasons. The quantification of differences between reanalyses is based on the percentage of grid points (approximately corresponding to the percentage of area) where the spatial representations of a mode (loadings) significantly differ between reanalyses. The differences between surface-input reanalyses (20CRv2c, ERA-20C) and full-input reanalyses (NCEP-1, ERA-40, JRA-55) are larger than differences within the reanalysis groups in all seasons except for autumn. The causes of the differences are of two kinds. First, the differences may be inherent to PCA: namely, the spatial structure of the modes may be sensitive to the number of components rotated. This concerns only a few modes. Second, the differences may reflect real correlation structures in reanalysis data. We demonstrate that the differences concentrate in three or fewer modes in each season. The reanalysis most different from the rest is 20CRv2c, with the differences concentrating over the southern half of Asia and in the subtropical belt over the Pacific and adjacent southwestern North America. The 20CRv2c reanalysis disagrees from other reanalyses there predominantly before the 1980s, which points to the impact of insufficient amount of assimilated observations. On the contrary, ERA-20C exhibits a higher agreement with full-input reanalyses, which is why we recommend it for studies of atmospheric circulation over the entire twentieth century.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10509 - Meteorology and atmospheric sciences
Result continuities
Project
<a href="/en/project/GA17-07043S" target="_blank" >GA17-07043S: Teleconnections - major building blocks of atmospheric circulation</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Climate
ISSN
0894-8755
e-ISSN
1520-0442
Volume of the periodical
33
Issue of the periodical within the volume
24
Country of publishing house
US - UNITED STATES
Number of pages
20
Pages from-to
10707-10726
UT code for WoS article
000615175200019
EID of the result in the Scopus database
2-s2.0-85094141795