publication . Article . 2015

Why the South Pacific Convergence Zone is diagonal

Karin van der Wiel; Manoj Joshi; Adrian J. Matthews; David P. Stevens;
Open Access English
  • Published: 28 May 2015
  • Country: United Kingdom
Abstract
During austral summer, the majority of precipitation over the Pacific Ocean is concentrated in the South Pacific Convergence Zone (SPCZ). The surface boundary conditions required to support the diagonally (northwest-southeast) oriented SPCZ are determined through a series of experiments with an atmospheric general circulation model. Continental configuration and orography do not have a significant influence on SPCZ orientation and strength. The key necessary boundary condition is the zonally asymmetric component of the sea surface temperature (SST) distribution. This leads to a strong subtropical anticyclone over the southeast Pacific that, on its western flank,...
Subjects
arXiv: Physics::Atmospheric and Oceanic PhysicsPhysics::Geophysics
free text keywords: Atmospheric Science, Climatology, South Pacific convergence zone, Rossby wave, Anticyclone, Geology, Convection, Convective available potential energy, Equator, Sea surface temperature, Atmospheric sciences, Orography
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