Impacts of Tropical Precipitation on the Uncertainty of the North
Pacific Subtropical High's Response to Anthropogenic Forcing
Abstract
The variability in summer North Pacific subtropical high (NPSH) has a
significant impact on the monsoon and typhoon over the East Asia and the
drought over the California. However, the future projection of the NPSH
through the state-of-art climate models, particularly those pertaining
to the tropical precipitation uncertainty remain unclear. In this
research, we explore the connection between tropical precipitation
uncertainty and the NPSH uncertainty through both fully coupled global
circulation models from CMIP5 and a dry-core atmospheric primitive
equation model. We have found that the biased condensational heating
released through the tropic precipitation interacts with the NPSH
through the Rossby wave train and the Kelvin wave response. The source
of the tropical precipitation uncertainty can be potentially responsible
for the uncertainty of the NPSH under the anthropogenic forced climate
change.