Vorticity and geopotential height extreme values in ERA-Interim data during boreal winters
The properties and dependences of lower tropospheric geopotential height (GPH) and relative vorticity extreme values are investigated in high spatial resolution ERA-Interim reanalysis data during the boreal winters from 1980–2014. A peak-over-threshold (POT) analysis is applied to determine the loca...
Published in: | Quarterly Journal of the Royal Meteorological Society |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2016
|
Subjects: | |
Online Access: | http://hdl.handle.net/11858/00-001M-0000-002C-3315-0 |
id |
ftpubman:oai:pure.mpg.de:item_2378624 |
---|---|
record_format |
openpolar |
spelling |
ftpubman:oai:pure.mpg.de:item_2378624 2023-08-20T04:08:23+02:00 Vorticity and geopotential height extreme values in ERA-Interim data during boreal winters Blender, R. Raible, C. Franzke, C. 2016-11 http://hdl.handle.net/11858/00-001M-0000-002C-3315-0 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1002/qj.2944 http://hdl.handle.net/11858/00-001M-0000-002C-3315-0 Quarterly Journal of the Royal Meteorological Society info:eu-repo/semantics/article 2016 ftpubman https://doi.org/10.1002/qj.2944 2023-08-01T21:37:15Z The properties and dependences of lower tropospheric geopotential height (GPH) and relative vorticity extreme values are investigated in high spatial resolution ERA-Interim reanalysis data during the boreal winters from 1980–2014. A peak-over-threshold (POT) analysis is applied to determine the local generalized Pareto distribution (GPD) parameters with a 90th percentile threshold. In Northern Hemispheric storm tracks, the scale parameter decreases along the storm track axis for vorticity, whereas it increases for GPH. The shape parameters are weakly negative for both fields in the northern midlatitudes and over land, suggesting upper bounds for the extremes. The blackassociation of GPD parameters blackwith the large-scale flow is assessed using monthly mean indices for the North Atlantic Oscillation (NAO), Pacific–North American (PNA) pattern and El Niño Southern Oscillation (Nino3.4 index) as covariates. blackWhile the GPH parameters are related to the covariates in the regions associated with the covariate loadings, the vorticity parameters are weakly related to all covariates. It is noteworthy that the NAO dominates all covariates in the central tropical Pacific. The probability for concurrent extreme events of vorticity and GPH is highest in storm tracks with values of about 0.3–0.5. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Max Planck Society: MPG.PuRe Pacific Quarterly Journal of the Royal Meteorological Society 143 703 634 640 |
institution |
Open Polar |
collection |
Max Planck Society: MPG.PuRe |
op_collection_id |
ftpubman |
language |
English |
description |
The properties and dependences of lower tropospheric geopotential height (GPH) and relative vorticity extreme values are investigated in high spatial resolution ERA-Interim reanalysis data during the boreal winters from 1980–2014. A peak-over-threshold (POT) analysis is applied to determine the local generalized Pareto distribution (GPD) parameters with a 90th percentile threshold. In Northern Hemispheric storm tracks, the scale parameter decreases along the storm track axis for vorticity, whereas it increases for GPH. The shape parameters are weakly negative for both fields in the northern midlatitudes and over land, suggesting upper bounds for the extremes. The blackassociation of GPD parameters blackwith the large-scale flow is assessed using monthly mean indices for the North Atlantic Oscillation (NAO), Pacific–North American (PNA) pattern and El Niño Southern Oscillation (Nino3.4 index) as covariates. blackWhile the GPH parameters are related to the covariates in the regions associated with the covariate loadings, the vorticity parameters are weakly related to all covariates. It is noteworthy that the NAO dominates all covariates in the central tropical Pacific. The probability for concurrent extreme events of vorticity and GPH is highest in storm tracks with values of about 0.3–0.5. |
format |
Article in Journal/Newspaper |
author |
Blender, R. Raible, C. Franzke, C. |
spellingShingle |
Blender, R. Raible, C. Franzke, C. Vorticity and geopotential height extreme values in ERA-Interim data during boreal winters |
author_facet |
Blender, R. Raible, C. Franzke, C. |
author_sort |
Blender, R. |
title |
Vorticity and geopotential height extreme values in ERA-Interim data during boreal winters |
title_short |
Vorticity and geopotential height extreme values in ERA-Interim data during boreal winters |
title_full |
Vorticity and geopotential height extreme values in ERA-Interim data during boreal winters |
title_fullStr |
Vorticity and geopotential height extreme values in ERA-Interim data during boreal winters |
title_full_unstemmed |
Vorticity and geopotential height extreme values in ERA-Interim data during boreal winters |
title_sort |
vorticity and geopotential height extreme values in era-interim data during boreal winters |
publishDate |
2016 |
url |
http://hdl.handle.net/11858/00-001M-0000-002C-3315-0 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Quarterly Journal of the Royal Meteorological Society |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/qj.2944 http://hdl.handle.net/11858/00-001M-0000-002C-3315-0 |
op_doi |
https://doi.org/10.1002/qj.2944 |
container_title |
Quarterly Journal of the Royal Meteorological Society |
container_volume |
143 |
container_issue |
703 |
container_start_page |
634 |
op_container_end_page |
640 |
_version_ |
1774720626144051200 |