Excitation of stratospheric planetary waves by the Asian high heating
AbstractWe studied the topographic heating center over the Tibetan and Persian
plateaus that forms the Asian high to try to understand its effects on
circulation in the stratosphere. The results show that the heating
center at 300 hPa excites planetary waves which can be propogated into
the southern hemisphere. The u wind regression field demonstrates the
planetary wave propogates from the northern to the southern hemisphere.
Once the planetary wave is propagated to the southern hemisphere, then
it forms another three-wave train, which strengthens as it propagates
upward. The wave propogation channel is at the upper troposphere above
the equator. The results also denote that the heating center of Asian
high may contribute to the QBO in the stratosphere which mechanism needs
to be argued deeply. These results partially explain why there are
planetary waves in the stratosphere of the southern hemisphere.