Tracking pulses of the Madden-Julian oscillation

Kunio Yoneyama, Chidong Zhang, Charles N. Long

Research output: Contribution to journalArticlepeer-review

285 Scopus citations


A field campaign in the Indian Ocean region collected unprecedented observations during October 2011'March 2012 to help advance knowledge of physical processes of the Madden-Julian oscillation (MJO). Studies on the MJO mean seasonal cycle indicated that main MJO initiation activity takes place in the central IO from October to March, with the highest occurrence probability near the equator in October-January. The special observing period (SOP) was designed to obtain high-resolution data to capture the diurnal cycle of convective activity with the maximum observing capacity. All other instruments continued to operate after the SOP until the end of the intensive observing period (IOP). Accompanying the sounding arrays and equally essential to the field campaign was a radar network. The 2011-12 MJO field campaign provided observations that are unique in several aspects in comparison to previous tropical field campaigns that aimed at interactions between atmospheric convection and its large-scale environment and between the atmosphere and ocean.

Original languageEnglish (US)
Pages (from-to)1871-1891
Number of pages21
JournalBulletin of the American Meteorological Society
Issue number12
StatePublished - Dec 2013

ASJC Scopus subject areas

  • Atmospheric Science


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