Reanalysis intercomparison of potential vorticity and potential-vorticity-based diagnostics
Global reanalyses from data assimilation systems are among the most widely used datasets in weather and climate studies, and potential vorticity (PV) from reanalyses is invaluable for many studies of dynamical and transport processes. We assess how consistently modern reanalyses represent potential...
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ftdoajarticles:oai:doaj.org/article:7a34c1dbcf3844b8a08af332c0d9bb50 2023-05-15T13:48:18+02:00 Reanalysis intercomparison of potential vorticity and potential-vorticity-based diagnostics L. F. Millán G. L. Manney Z. D. Lawrence 2021-04-01T00:00:00Z https://doi.org/10.5194/acp-21-5355-2021 https://doaj.org/article/7a34c1dbcf3844b8a08af332c0d9bb50 EN eng Copernicus Publications https://acp.copernicus.org/articles/21/5355/2021/acp-21-5355-2021.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-21-5355-2021 1680-7316 1680-7324 https://doaj.org/article/7a34c1dbcf3844b8a08af332c0d9bb50 Atmospheric Chemistry and Physics, Vol 21, Pp 5355-5376 (2021) Physics QC1-999 Chemistry QD1-999 article 2021 ftdoajarticles https://doi.org/10.5194/acp-21-5355-2021 2022-12-31T05:59:16Z Global reanalyses from data assimilation systems are among the most widely used datasets in weather and climate studies, and potential vorticity (PV) from reanalyses is invaluable for many studies of dynamical and transport processes. We assess how consistently modern reanalyses represent potential vorticity (PV) among each other, focusing not only on PV but also on process-oriented dynamical diagnostics including equivalent latitude calculated from PV and PV-based tropopause and stratospheric polar vortex characterization. In particular we assess the National Centers for Environmental Prediction Climate Forecast System Reanalysis/Climate Forecast System, version 2 (CFSR/CFSv2) reanalysis, the European Centre for Medium-Range Weather Forecasts Interim (ERA-Interim) reanalysis, the Japanese Meteorological Agency's 55-year (JRA-55) reanalysis, and the NASA Modern-Era Retrospective analysis for Research and Applications, version 2 (MERRA-2). Overall, PV from all reanalyses agrees well with the reanalysis ensemble mean, providing some confidence that all of these recent reanalyses are suitable for most studies using PV-based diagnostics. Specific diagnostics where some larger differences are seen include PV-based tropopause locations in regions that have strong tropopause gradients (such as around the subtropical jets) or are sparse in high-resolution data (such as over Antarctica), and the stratospheric polar vortices during fall vortex formation and (especially) spring vortex breakup; studies of sensitive situations or regions such as these should examine PV from multiple reanalyses. Article in Journal/Newspaper Antarc* Antarctica Directory of Open Access Journals: DOAJ Articles Merra ENVELOPE(12.615,12.615,65.816,65.816) Atmospheric Chemistry and Physics 21 7 5355 5376 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 L. F. Millán G. L. Manney Z. D. Lawrence Reanalysis intercomparison of potential vorticity and potential-vorticity-based diagnostics |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Global reanalyses from data assimilation systems are among the most widely used datasets in weather and climate studies, and potential vorticity (PV) from reanalyses is invaluable for many studies of dynamical and transport processes. We assess how consistently modern reanalyses represent potential vorticity (PV) among each other, focusing not only on PV but also on process-oriented dynamical diagnostics including equivalent latitude calculated from PV and PV-based tropopause and stratospheric polar vortex characterization. In particular we assess the National Centers for Environmental Prediction Climate Forecast System Reanalysis/Climate Forecast System, version 2 (CFSR/CFSv2) reanalysis, the European Centre for Medium-Range Weather Forecasts Interim (ERA-Interim) reanalysis, the Japanese Meteorological Agency's 55-year (JRA-55) reanalysis, and the NASA Modern-Era Retrospective analysis for Research and Applications, version 2 (MERRA-2). Overall, PV from all reanalyses agrees well with the reanalysis ensemble mean, providing some confidence that all of these recent reanalyses are suitable for most studies using PV-based diagnostics. Specific diagnostics where some larger differences are seen include PV-based tropopause locations in regions that have strong tropopause gradients (such as around the subtropical jets) or are sparse in high-resolution data (such as over Antarctica), and the stratospheric polar vortices during fall vortex formation and (especially) spring vortex breakup; studies of sensitive situations or regions such as these should examine PV from multiple reanalyses. |
format |
Article in Journal/Newspaper |
author |
L. F. Millán G. L. Manney Z. D. Lawrence |
author_facet |
L. F. Millán G. L. Manney Z. D. Lawrence |
author_sort |
L. F. Millán |
title |
Reanalysis intercomparison of potential vorticity and potential-vorticity-based diagnostics |
title_short |
Reanalysis intercomparison of potential vorticity and potential-vorticity-based diagnostics |
title_full |
Reanalysis intercomparison of potential vorticity and potential-vorticity-based diagnostics |
title_fullStr |
Reanalysis intercomparison of potential vorticity and potential-vorticity-based diagnostics |
title_full_unstemmed |
Reanalysis intercomparison of potential vorticity and potential-vorticity-based diagnostics |
title_sort |
reanalysis intercomparison of potential vorticity and potential-vorticity-based diagnostics |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/acp-21-5355-2021 https://doaj.org/article/7a34c1dbcf3844b8a08af332c0d9bb50 |
long_lat |
ENVELOPE(12.615,12.615,65.816,65.816) |
geographic |
Merra |
geographic_facet |
Merra |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Atmospheric Chemistry and Physics, Vol 21, Pp 5355-5376 (2021) |
op_relation |
https://acp.copernicus.org/articles/21/5355/2021/acp-21-5355-2021.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-21-5355-2021 1680-7316 1680-7324 https://doaj.org/article/7a34c1dbcf3844b8a08af332c0d9bb50 |
op_doi |
https://doi.org/10.5194/acp-21-5355-2021 |
container_title |
Atmospheric Chemistry and Physics |
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21 |
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7 |
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5355 |
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5376 |
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