Precipitation and temperature anomalies over Aotearoa New Zealand analysed by weather types and descriptors of atmospheric centres of action

Benjamin Pohl (1) , Andrew Sturman , James Renwick , Hervé Quénol (2) , Nicolas Fauchereau , Andrew Lorrey , Julien Pergaud (1)

1 BGS - Biogéosciences [UMR 6282]
2 LETG - Rennes - Littoral, Environnement, Télédétection, Géomatique

Weather types (WTs) are often used to assess the relationships between synoptic-scale atmospheric dynamics and local scale climate anomalies. We focus here on Aotearoa New Zealand (ANZ) where pre-existing WTs have recently been characterized using a set of descriptors monitoring the daily location and intensity of their main atmospheric centres of action (ACAs). We show here that the precipitation and temperature anomalies associated with the WTs in ANZ are more complex than previously thought. They do not solely depend on type occurrence, but are also strongly modulated by within-type changes in the location and intensity of ACAs, and their interaction with surface terrain.

Mots clés: Aotearoa New Zealand; atmospheric centres of action; precipitation; southern mid-latitudes; synoptic variability; temperature; weather types

Domaines: Océan, Atmosphère

Benjamin Pohl, Andrew Sturman, James Renwick, Hervé Quénol, Nicolas Fauchereau, et al.. Precipitation and temperature anomalies over Aotearoa New Zealand analysed by weather types and descriptors of atmospheric centres of action. International Journal of Climatology, 2023, 43, pp.331-353. ⟨10.1002/joc.7762⟩. ⟨hal-03720488⟩