Decadal variability influences yeartoyear climate fluctuations in the

Decadal variability influences year-to-year climate fluctuations in the tropical Indo-Pacific region Global wavelet spectra for the Objective Indian monsoon Determine why the Indo-Pacific climate (top) and ENSO system, encompassing the Indian (bottom) with monsoon and ENSO, is more biennial vertical line at during certain decades than others. the biennial 2 That is, what determines the strength of year period the tropospheric biennial oscillation showing a (TBO) with associated predictability of larger amplitude the tropical interannual climate system TBO for decadal Approach on decadal timescales periods of negative • Analyze observations of sea IPO (blue lines), surface temperature (SST) and weaker TBO Indian monsoon rainfall, and relate for positive IPO Impact the strength of the TBO to the (red lines) (from the phase of the Interdecadal Pacific During decades of positive IPO late-1970 s to the late-1990 s), the Indo. Oscillation (IPO) • Identify decadal periods when the Pacific climate system was less biennial IPO is positive (somewhat warmer and the TBO was weak, and the opposite than normal SSTs in the eastern after the late 1990 s with corresponding tropical Pacific) and negative, and improved predictability. Meehl, G. A. , and Arblaster, 2012: Relating the strength of the tropospheric biennial oscillation (TBO) to the phase of the Interdecadal connect to. J. M. the TBO Pacific Oscillation (IPO). Geophys. Res. Lett. , doi: 10. 1029/2012 GL 053386.