Polar low tracks over the Nordic Seas: a 14-winter climatic analysis

Autor: Rojo, Maxence, Claud, Chantal, Mallet, Paul-Etienne, Noer, Gunnar, Carleton, Andrew M., Vicomte, Marie
Přispěvatelé: Cultures, Environnements, Arctique, Représentations, Climat (CEARC), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Météorologie Dynamique (UMR 8539) (LMD), Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École des Ponts ParisTech (ENPC)-École polytechnique (X)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Observatoire de Versailles Saint-Quentin-en-Yvelines (OVSQ), Norwegian Meteorological Institute [Oslo] (MET), Earth and Environmental Systems Institute [PennState] (EESI), Pennsylvania State University (Penn State), Penn State System-Penn State System, 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, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-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), French National Agency for Research, European Community 7th Framework programme
Jazyk: angličtina
Rok vydání: 2015
Předmět:
Zdroj: Tellus A
Tellus A, Co-Action Publishing, 2015, 67 (1), ⟨10.3402/tellusa.v67.24660⟩
Tellus A, 2015, 67 (1), ⟨10.3402/tellusa.v67.24660⟩
Tellus: Series A, Dynamic Meteorology and Oceanography, Vol 67, Iss 0, Pp 1-20 (2015)
Tellus A; Vol 67 (2015)
ISSN: 0280-6495
1600-0870
DOI: 10.3402/tellusa.v67.24660⟩
Popis: To develop a 14-winter (October–April; 1999–2013) climatic description of polar low (PL) occurrence for the Nordic Seas, systems have been tracked using images acquired from the Very High Resolution Radiometer (AVHRR). Also, the dominant PL characteristics – their temporal and spatial distributions, size, lifespan, distance travelled, speed of propagation and directions – have been determined. On average, 14 PL events occur per winter but there is strong inter-annual and intra-seasonal variability. Although systems may form and travel over the whole Nordic Seas, their genesis is enhanced in areas characterised by warm oceanic currents. At the start of the season (October–November), systems mainly form over the Greenland and Norwegian Seas, but further into winter they form increasingly over the Barents Sea. In connection with recent low-ice winters, new areas of PL formation are evident, particularly to the west of Spitsbergen and in the Barents Sea. PL speeds of propagation range between 5 and 13 m/s but are observed to be highly variable among cases and even during the lifespan of individual PLs. To a considerable extent, the direction of movement is controlled by the large-scale flow in the lowest atmospheric layers, but we also observed cyclonic co-rotation of some pairs of PLs due to their influence on the ambient flow. Although these generally move southward or southeastward, a substantial number of PLs have westward and even northward tracks. PLs in the western part of the region average larger than their eastern counterparts. This study also highlights that PLs characteristics and tracks differ according to weather regimes.Keywords: polar low, the Norwegian Sea, the Barents Sea, tracks, weather regime, sea-ice, dual and multiple systems(Published: 8 April 2015)Citation: Tellus A 2015, 67, 24660, http://dx.doi.org/10.3402/tellusa.v67.24660
Databáze: OpenAIRE
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