Coherent Bimodal Events in Ensemble Forecasts of 2-m Temperature
International audience A previous study has shown that a large portion of subseasonal-to-seasonal European Centre for Medium-Range Weather Forecasts (ECMWF) ensemble forecasts for 2-m temperature exhibit properties of univariate bimodality, in some locations occurring in over 30% of forecasts. This...
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ftinspolytechpar:oai:HAL:insu-04472092v1 2024-06-16T07:41:46+00:00 Coherent Bimodal Events in Ensemble Forecasts of 2-m Temperature Bertossa, Cameron Hitchcock, Peter Degaetano, Arthur Plougonven, Riwal Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) 2023 https://insu.hal.science/insu-04472092 https://doi.org/10.1175/WAF-D-23-0053.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/WAF-D-23-0053.1 insu-04472092 https://insu.hal.science/insu-04472092 BIBCODE: 2023WtFor.38.1953B doi:10.1175/WAF-D-23-0053.1 ISSN: 0882-8156 EISSN: 1520-0434 Weather and Forecasting https://insu.hal.science/insu-04472092 Weather and Forecasting, 2023, 38, pp.1953-1970. ⟨10.1175/WAF-D-23-0053.1⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2023 ftinspolytechpar https://doi.org/10.1175/WAF-D-23-0053.1 2024-05-19T23:42:15Z International audience A previous study has shown that a large portion of subseasonal-to-seasonal European Centre for Medium-Range Weather Forecasts (ECMWF) ensemble forecasts for 2-m temperature exhibit properties of univariate bimodality, in some locations occurring in over 30% of forecasts. This study introduces a novel methodology to identify “bimodal events,” meteorological events that trigger the development of spatially and temporally correlated bimodality in forecasts. Understanding such events not only provides insight into the dynamics of the meteorological phenomena causing bimodal events, but also indicates when Gaussian interpretations of forecasts are detrimental. The methodology that is developed allows one to systematically characterize the spatial and temporal scales of the derived bimodal events, and thus uncover the flow states that lead to them. Three distinct regions that exhibit high occurrence rates of bimodality are studied: one in South America, one in the Southern Ocean, and one in the North Atlantic. It is found that bimodal events in each region appear to be triggered by synoptic processes interacting with geographically specific processes: in South America, bimodality is often related to Andes blocking events; in the Southern Ocean, bimodality is often related to an atmospheric Rossby wave interacting with sea ice; and in the North Atlantic, bimodality is often connected to the displacement of a persistent subtropical high. This common pattern of large-scale circulation anomalies interacting with local boundary conditions suggests that any deeper dynamical understanding of these events should incorporate such interactions. Article in Journal/Newspaper North Atlantic Sea ice Southern Ocean HAL de l'Institut Polytechnique de Paris Southern Ocean Weather and Forecasting 38 10 1953 1970 |
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Open Polar |
collection |
HAL de l'Institut Polytechnique de Paris |
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ftinspolytechpar |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Bertossa, Cameron Hitchcock, Peter Degaetano, Arthur Plougonven, Riwal Coherent Bimodal Events in Ensemble Forecasts of 2-m Temperature |
topic_facet |
[SDU]Sciences of the Universe [physics] |
description |
International audience A previous study has shown that a large portion of subseasonal-to-seasonal European Centre for Medium-Range Weather Forecasts (ECMWF) ensemble forecasts for 2-m temperature exhibit properties of univariate bimodality, in some locations occurring in over 30% of forecasts. This study introduces a novel methodology to identify “bimodal events,” meteorological events that trigger the development of spatially and temporally correlated bimodality in forecasts. Understanding such events not only provides insight into the dynamics of the meteorological phenomena causing bimodal events, but also indicates when Gaussian interpretations of forecasts are detrimental. The methodology that is developed allows one to systematically characterize the spatial and temporal scales of the derived bimodal events, and thus uncover the flow states that lead to them. Three distinct regions that exhibit high occurrence rates of bimodality are studied: one in South America, one in the Southern Ocean, and one in the North Atlantic. It is found that bimodal events in each region appear to be triggered by synoptic processes interacting with geographically specific processes: in South America, bimodality is often related to Andes blocking events; in the Southern Ocean, bimodality is often related to an atmospheric Rossby wave interacting with sea ice; and in the North Atlantic, bimodality is often connected to the displacement of a persistent subtropical high. This common pattern of large-scale circulation anomalies interacting with local boundary conditions suggests that any deeper dynamical understanding of these events should incorporate such interactions. |
author2 |
Laboratoire de Météorologie Dynamique (UMR 8539) (LMD) Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) |
format |
Article in Journal/Newspaper |
author |
Bertossa, Cameron Hitchcock, Peter Degaetano, Arthur Plougonven, Riwal |
author_facet |
Bertossa, Cameron Hitchcock, Peter Degaetano, Arthur Plougonven, Riwal |
author_sort |
Bertossa, Cameron |
title |
Coherent Bimodal Events in Ensemble Forecasts of 2-m Temperature |
title_short |
Coherent Bimodal Events in Ensemble Forecasts of 2-m Temperature |
title_full |
Coherent Bimodal Events in Ensemble Forecasts of 2-m Temperature |
title_fullStr |
Coherent Bimodal Events in Ensemble Forecasts of 2-m Temperature |
title_full_unstemmed |
Coherent Bimodal Events in Ensemble Forecasts of 2-m Temperature |
title_sort |
coherent bimodal events in ensemble forecasts of 2-m temperature |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://insu.hal.science/insu-04472092 https://doi.org/10.1175/WAF-D-23-0053.1 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
North Atlantic Sea ice Southern Ocean |
genre_facet |
North Atlantic Sea ice Southern Ocean |
op_source |
ISSN: 0882-8156 EISSN: 1520-0434 Weather and Forecasting https://insu.hal.science/insu-04472092 Weather and Forecasting, 2023, 38, pp.1953-1970. ⟨10.1175/WAF-D-23-0053.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/WAF-D-23-0053.1 insu-04472092 https://insu.hal.science/insu-04472092 BIBCODE: 2023WtFor.38.1953B doi:10.1175/WAF-D-23-0053.1 |
op_doi |
https://doi.org/10.1175/WAF-D-23-0053.1 |
container_title |
Weather and Forecasting |
container_volume |
38 |
container_issue |
10 |
container_start_page |
1953 |
op_container_end_page |
1970 |
_version_ |
1802009050245758976 |