Numerical simulation of sea breeze interactions over the Auckland Region, New Zealand

Abstract

The Colorado State University mesoscale model is used to investigate the influence of gradient wind direction on migratory sea breeze convergence zones (SBCZs) that develop over an irregular coastline incorporating two narrow peninsulas. Results, which are in good qualitative agreement with observations, reveal that SBCZ dynamics are strongly influenced by the extent to which flow is either subparallel or perpendicular to the orientation of the major coastlines. The local coastal configuration is also shown to be the dominant factor controlling the location of zones of intense vertical motion associated with SBCZs. A notable aspect of the study was the simulation of a late afternoon mesoscale cyclonic eddy caused by the interaction of sea breezes during southeasterly gradient flow. Further observations are recommended to verify the existence of this phenomenon. © 1992 Taylor & Francis Group, LLC.