Intraseasonal Variability of the Indonesian Throughflow Associated with
the Madden-Julian Oscillation
Abstract
Previous studies indicate significant intraseasonal (20-90 days)
variability on the Indonesian Throughflow (ITF) transport produced by
the Madden-Julian Oscillation (MJO). These studies, however, mostly
focus on the transport through each individual strait, especially
Makassar strait, and overall impacts of the MJO on ITF transport are not
well understood. This study examines the intraseasonal variability of
ITF transport associated with the MJO, including the transport through
multiple major straits (Makassar, Lombok, Ombai, Timor) in the
Indonesian Seas using a new 1/12° global HYbrid Coordinate Ocean Model
(HYCOM) reanalysis. The composite analyses of oceanic and atmospheric
variables are performed for the period January 2004-December 2015, in
which eighteen well-defined MJO events were identified. Consistent with
previous studies, large intraseasonal variability of the Makassar Strait
Throughflow is identified from the analysis. In addition, the
contribution of anomalous ITF transport through other straits during
both active and suppressed phase of the MJO for the total transport is
quantified based on the composite analysis.