Year-To-Year Variability in the Hadley and Walker Circulations from NCEP/NCAR Reanalysis Data [chapter]

Shoshiro Minobe
2004 Advances in Global Change Research  
The year-to-year variability in the local Hadley and Walker circulations is studied by the EOF analysis of zonal and meridional divergent winds at 200 and 850 hPa of the NCEP/NCAR reanalysis data. The first mode of the EOF analysis since 1979 is closely related to El Nino/Southern Oscillation. The corresponding vertical velocity structure at the middle of the troposphere is characterized by the combination of a horseshoe in the western tropical Pacific and an oval in the central-eastern
more » ... ral-eastern equatorial Pacific, consistent with satellite-derived precipitation correlations. A streamline analysis for horizontal divergent winds and vertical winds revealed that the dominant local Hadley and Walker circulation anomalies connect the oval and the horseshoe, while the other clusters of the local Hadley circulation anomalies rotating in opposing directions emanate from the Maritime Continent
doi:10.1007/978-1-4020-2944-8_6 fatcat:shghwy7vdfdy7a75qvrpxowkw4