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The synoptic-dynamics of summertime heatwaves in the Sydney area (Australia)

Parker, Tess; Quinting, Julian; Reeder, Michael

Abstract:
Motivated by the record-breaking heatwaves of early 2017, the synoptic structure and evolution of summer (December–February) heatwaves in the Sydney area is investigated through composite and trajectory analyses. In the upper troposphere, the main features of the composite structure are an isolated upper-tropospheric anticyclonic potential vorticity (PV) anomaly to the south-east of Australia and cyclonic anomalies to the east and south. Back trajectories starting from within the upper-tropospheric anticyclonic PV anomaly on the first day of the heatwave fall into two groups: those that are diabatically cooled in the final 72 h and those that are diabatically heated. Those that are cooled come predominantly from the upstreammiddle troposphere over the Indian Ocean. The change in the potential temperature of these parcels is less than 3K, and so their motion is effectively adiabatic. In contrast, those parcels that are heated in the final 72 h are drawn predominantly from the lower half of the troposphere over the south-western part of the continent. As they ascended, their potential temperature increases by 10K in the mean due to latent heating. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000120169
Veröffentlicht am 16.06.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Forschungsbereich Troposphäre (IMK-TRO)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2206-5865
KITopen-ID: 1000120169
Erschienen in Journal of southern hemisphere earth systems science
Band 69
Heft 1
Seiten 116-130
Vorab online veröffentlicht am 11.06.2020
Nachgewiesen in Web of Science
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