dorsal/arxiv
View SchemaDoes the subtropical jet catalyze the mid-latitude atmospheric regimes?
| Authors | Paolo M. Ruti, Valerio Lucarini, Alessandro Dell'Aquila, Sandro Calmanti, Antonio Speranza |
|---|---|
| Categories | |
| ArXiv ID | physics/0508193 |
| URL | https://arxiv.org/abs/physics/0508193 |
| DOI | 10.1029/2005GL024620 |
| Journal | Geophys. Res. Lett. 33, L06814, 2006 |
Abstract
Understanding the atmospheric low-frequency variability is of crucial importance in fields such as climate studies, climate change detection, and extended-range weather forecast. The Northern Hemisphere climate features the planetary waves as a relevant ingredient of the atmospheric variability. Several observations and theoretical arguments seem to support the idea that winter planetary waves indicator obey a non-Gaussian statistics and may present a multimodal probability density function, thus characterizing the low-frequency portion of the climate system. We show that the upper tropospheric jet strength is a critical parameter in determining whether the planetary waves indicator exhibits a uni- or bimodal behavior, and we determine the relevant threshold value of the jet. These results are obtained by considering the data of the NCEP-NCAR and ECMWF reanalyses for the overlapping period. Our results agree with the non-linear orographic theory, which explains the statistical non-normality of the low-frequency variability of the atmosphere and its possible bimodality.
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"abstract": "Understanding the atmospheric low-frequency variability is of crucial\nimportance in fields such as climate studies, climate change detection, and\nextended-range weather forecast. The Northern Hemisphere climate features the\nplanetary waves as a relevant ingredient of the atmospheric variability.\nSeveral observations and theoretical arguments seem to support the idea that\nwinter planetary waves indicator obey a non-Gaussian statistics and may present\na multimodal probability density function, thus characterizing the\nlow-frequency portion of the climate system. We show that the upper\ntropospheric jet strength is a critical parameter in determining whether the\nplanetary waves indicator exhibits a uni- or bimodal behavior, and we determine\nthe relevant threshold value of the jet. These results are obtained by\nconsidering the data of the NCEP-NCAR and ECMWF reanalyses for the overlapping\nperiod. Our results agree with the non-linear orographic theory, which explains\nthe statistical non-normality of the low-frequency variability of the\natmosphere and its possible bimodality.",
"arxiv_id": "physics/0508193",
"authors": [
"Paolo M. Ruti",
"Valerio Lucarini",
"Alessandro Dell\u0027Aquila",
"Sandro Calmanti",
"Antonio Speranza"
],
"categories": [
"physics.ao-ph",
"physics.flu-dyn",
"physics.geo-ph"
],
"doi": "10.1029/2005GL024620",
"journal_ref": "Geophys. Res. Lett. 33, L06814, 2006",
"title": "Does the subtropical jet catalyze the mid-latitude atmospheric regimes?",
"url": "https://arxiv.org/abs/physics/0508193"
},
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