Australia is impacted a bit more differently than Indonesia, but just take it that a positive IOD also impacts Indonesia and reinforces the dry climate. But main driver is El Nino.
Positive IOD = cooler Indian Ocean near our end (Eastern side of Indian Ocean) and warmer Indian Ocean near Eastern coast of Africa.
Just take it that convection/rainfall follows the warmer waters.
http://www.smh.com.au/environment/w...set-to-reinforce-el-nino-20150526-gha1br.html
Australia's outlook turns drier as Indian Ocean set to reinforce El Nino
Prospects are firming that the latest El Nino event may leave much of Australia drier, with conditions in the Indian Ocean possibly reinforcing those in the Pacific, the Bureau of Meteorology says.
In its fortnightly update, the bureau said the El Nino continues to strengthen in the tropical Pacific and sea-surface temperatures are likely to remain "well above" the threshold for such events into the southern hemisphere spring.
"We've had some weak El Ninos in recent years but this one looks like being quite significant," David Jones, head of climate prediction services at the bureau, said, adding that the event looks likely to exceed the intensity of the previous three in 2002, 2006 and 2009.
El Ninos form when the equatorial central and eastern Pacific waters warm relative to western regions, resulting in a weakening or reversal in the easterly trade winds. Rainfall tends to shift eastwards away from Australia and south-east Asia, while countries on the Pacific's eastern fringe tend to have wet years.
Whether Australia has a particularly dry period during an El Nino year depends largely on how the Indian Ocean counters or reinforces the Pacific influence.
The latest readings suggest the Indian Ocean off north-western Australia is starting to cool, a shift that would tend to reduce moisture flows over the continent.
A survey of international models suggests the shift to a so-called positive Indian Ocean Dipole favouring drier than usual conditions over central and southern Australia will take place later this year:
"You've got both [the El Nino and the Indian Ocean Dipole] likely to work in the same direction for rainfall intensity," Dr Jones said. "Basically the Indian Ocean will tend to work with the Pacific and dry the Australian climate."
Temperature anomalies in the Pacific, meanwhile, have increased further in recent weeks, reaching 1-2 degrees at the surface, resembling "a classic El Nino pattern", the bureau said.
A survey by the bureau of major climate models points to further warming in the central Pacific in coming months.
The consistency of the models "indicates a low likelihood of the current event breaking down rapidly", the bureau said.
I still remember asking one seller what is 顺丰到付, searching what is it to 拍 a 宝贝, 不拍不送, etc. 
