NOTES AND CORRESPONDENCE On Wind, Convection, and SST Variations in the Northeastern Tropical Pacific Associated with the Madden–Julian Oscillation*
نویسندگان
چکیده
Lagged maximum covariance analysis (LMCA) is used to examine the intraseasonal variability of zonal wind, sea surface temperature (SST), and outgoing longwave radiation (OLR) in the northeastern tropical Pacific Ocean during Northern Hemisphere summertime. The analysis shows a strong temporal asymmetry in that wind and convection anomalies lead to SST anomalies, but SST anomalies are not followed by comparably strong wind and convection anomalies. This suggests that SST anomalies associated with the MJO in the northeastern tropical Pacific are largely subject to atmospheric variability.
منابع مشابه
NOTES AND CORRESPONDENCE Potential Vorticity, Easterly Waves, and Eastern Pacific Tropical Cyclogenesis
A significant sign reversal in the meridional potential vorticity gradient was found during the summer of 1991 on the 310-K isentropic surface (near 700 mb) over the Caribbean Sea. The Charney–Stern necessary condition for instability of the mean flow is met in this region. It is speculated that the sign reversal permits either invigoration of African waves or actual generation of easterly wave...
متن کاملNOTES AND CORRESPONDENCE Analysis of Atlantic SST Variability Factoring Interbasin Links and the Secular Trend: Clarified Structure of the Atlantic Multidecadal Oscillation
Atlantic SST variability in the twentieth century is analyzed factoring the influence of natural SST variability in the Pacific basin and the secular change in global SSTs. The tropical and northern extratropical basins are analyzed together using the extended EOF technique, which permits extraction of the interannual and multidecadal modes in the pan-Atlantic basin in a single step. The leadin...
متن کاملNOTES AND CORRESPONDENCE On the Relationship between the Streamfunction and Velocity Potential of the Madden–Julian Oscillation
The streamfunction and velocity potential variances associated with the Madden–Julian oscillation are explained substantially by their zonal wavenumber-1 components, which are used to measure quantitatively the phase relationship between the two variables. There exists a quarter-cycle phase difference between them. A simplified streamfunction budget equation was used to demonstrate analytically...
متن کاملNOTES AND CORRESPONDENCE Estimates of Surface and Subsurface Forcing for Decadal Sea Surface Temperature Variability in the Mid-Latitude North Pacific
The upper ocean, atmosphere and their interaction over the North Pacific exhibit pronounced decadal to interdecadal variations. A diagnostic equation for analyzing the heat budget for decadal variability in winter sea surface temperature (SST) is derived that can properly account for subsurface geostrophic advection, and strong seasonal cycle in the depth and temperature of the ocean mixed laye...
متن کاملNOTES AND CORRESPONDENCE Tropical Atmospheric Variability Forced by Oceanic Internal Variability
Atmospheric general circulation model experiments are conducted to quantify the contribution of internal oceanic variability in the form of tropical instability waves (TIWs) to interannual wind and rainfall variability in the tropical Pacific. It is found that in the tropical Pacific, along the equator, and near 25°N and 25°S, TIWs force a significant increase in wind and rainfall variability f...
متن کامل