Australia-Asian Monsoon in Two Versions of the UK Met Office Unified Model and Their Impacts on Tropical-Extratropical Teleconnections

The Australia and Asian monsoons were evaluated in monthly rainfall simulation over the Australia and Asia region in the UK Met Office Unified Model Global Atmosphere 6.0/7.0 (GA6/GA7), which horizontal resolution were N96 ( ~60 km) and N216 ( ~135 km). GA6 model can clearly reveal the seasonal variation characteristics of rainfall in Australia and Asian region. But there are differences in rainfall area, magnitude and time period. The higher resolution (N216) GA6 model simulations have better performance than low resolution (N96) GA6 model. Australian summer monsoon and Asian summer monsoon improved in GA7, particularly rainfall penetrating more southward along the eastern coastal in Australia and the Indian peninsula. Furthermore, higher resolution (N216) GA7 model simulations have better performance than low resolution (N96) GA7 model in southern China and the southern edge of the Tibetan plateau. It is shown that a significant Monsoon-Desert teleconnection for Indian monsoon rainfall and Central Asia (CA) region, with negative correlation of rainfall between the two regions.