Abstract
Abstract. This study examines the decadal changes in the in-phase relationship between Indian summer monsoon and the subsequent Australian summer monsoon using observational data from 1950–2005. The in-phase relationship is the tendency for a strong Indian summer monsoon to be followed by a strong Australian summer monsoon and vice versa. It is found that the in-phase relationship was weak during the late 1950s and early 1960s, strengthened to a maximum in the early 1970s just before the 1976/77 Pacific climate shift, then declined until the late 1990s. Pacific SST anomalies are noticed to have strong persistence from boreal to austral summer, providing the memory to connect the Indian and subsequent Australian summer monsoon. The simultaneous correlation between the Pacific SST anomalies and the Indian summer monsoon is always strong. It is the weakening and strengthening of the simultaneous correlation between the Australian summer monsoon and the Pacific SST anomalies that contributes to the decadal variations of the in-phase monsoon relation. This study suggests that the interaction between the Australian monsoon and the Pacific Ocean is crucial to tropical climate variability and has experienced significant changes over the past five decades.
Highlights
An interesting phenomenon in the Indian-Australian monsoon system is the tendency for a strong Indian summer monsoon to be followed by a strong Australian summer monsoon and vice versa (e.g. Hung et al, 2004, and the reference therein). Yu et al (2003) used a coupled atmosphere-ocean general circulation model (CGCM) to examine the relative importance of the Pacific and Indian Oceans to this in-phase transition
Since many studies have suggested that El Nino-Southern Oscillation (ENSO) experiences decadal changes in its properties (e.g. Gu and Philander, 1995; Wang, 1995) and its relationships with the Indian monsoon (Kumar et al, 1999; Kinter et al, 2002) and Australian monsoon (Power et al, 1999), it is reasonable to suspect that the in-phase relationship between the Indian and succeeding Australian summer monsoon may have undergone decadal changes
We examined in this study the changes in the correlations between tropical Pacific sea surface temperature (SST), Indian summer monsoon, and Australian summer monsoon during the past five decades
Summary
An interesting phenomenon in the Indian-Australian monsoon system is the tendency for a strong Indian summer monsoon to be followed by a strong Australian summer monsoon and vice versa A. Janiga: Changes in Indian and Australian summer monsoon relation. AA hhypyopthoetthiceatlicmaelchmaneiscmhafonritshme inf-oprhasthe erelianti-opnshhaipsebertweleaetniothnesIhnidpian banedtwsuebesnequthenet IAnudsitaranliaanndsumsumbesremquonesnotonAs.uTshtreal“i-a“nsisgunmsmtanedrs mfoor nasonoegnasti.ve Tcohrreela“t–io”n saingdnthset“a+n”daspfoosirtivaenceogrraeltaitvioen.correlation and the “+” for a positive correlation
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