Eastern margin variability of the South Pacific Convergence Zone
Article first published online: 16 AUG 2008
Copyright 2008 by the American Geophysical Union.
Geophysical Research Letters
Volume 35, Issue 16, August 2008
How to Cite
2008), Eastern margin variability of the South Pacific Convergence Zone, Geophys. Res. Lett., 35, L16701, doi:10.1029/2008GL034298., and (
- Issue published online: 16 AUG 2008
- Article first published online: 16 AUG 2008
- Manuscript Accepted: 15 JUL 2008
- Manuscript Revised: 24 JUN 2008
- Manuscript Received: 11 APR 2008
 The influence of low-level inflow wind and its high-frequency variability on the spatial characteristics of the eastern margin of the South Pacific Convergence Zone (SPCZ) is examined. Compositing daily and 5-day mean low-level wind, precipitation, and tropospheric moisture data reveals a clear relationship between high-frequency zonal inflow variations and the eastern SPCZ margin, with relaxation of trade wind intensity associated with increased moisture near the mean eastern SPCZ margin and an eastward displacement of the convection. An idealized 2-dimensional model demonstrates that variations in dry air inflow cause tropospheric moisture and precipitation variations akin to those observed. In this prototype, factors affecting the extent of SPCZ variability are also important to the mean margin position. SPCZ margin shifts under natural variability thus offer an observational target against which to evaluate simulated interactions of inflow air mass characteristics with convection.