Maritime continent weakens Asian Tropical Monsoon rainfall through Australian cross-equatorial flows

IMAGE: A new study reveals how maritime continent weakens Asian tropical monsoon rainfall through Australian Cross-equatorial Flows. view more 

Credit: Moran Zhuang

Cross-equatorial flows (CEFs) north of the Australia in the lower atmosphere play a pivotal role in mass, moisture and energy transport between the Northern and Southern Hemispheres, and serve as one of the crucial components of the Asian monsoon system.

"CEFs have a profound effect on the weather and climate anomalies in Asia." Said Moran Zhuang, a Ph.D. candidate from the Institute of Atmospheric Physics under the Chinese Academy of Sciences and the lead author of a new study published in Journal of Climate. "Most previous study focused on either the effect of the orography alone or the response of the global climate due to the land-sea contrast in Maritime Continent with a coarser-resolution model. In our study, we use an atmospheric general circulation model of finer resolution."

"And instead of focusing on only one factor, our study is the first attempt to explore the relative impacts of diverse Maritime Continent (MC) factors on the CEFs north of Australia and tropical Asian monsoon rainfall, and reveals the indirect effect of the MC on weakening precipitation over South Asia." Said Zhuang's supervisor Prof. DUAN Anmin, also the corresponding author of the study. The factors covered in this study include the land-sea contrast, orography and surface roughness over the MC.

They found that the Australian CE....

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