Geoscience Reference
In-Depth Information
Fig. 6. Precipitation anomalies in summer (JJA) by the SSTA forcing of positive phase
of the PIM. Unit: mm/d.
phase of the PIM after 16 April. In order to decrease influences of initial
error and other errors, the control experiment and sensitivity experiment
apply seven ensemble members starting from some different initial states.
The seven ensemble members mean is used. From the difference between the
control experiment and the sensitivity experiment, it can be the anomalous
response to the SSTA forcing.
Figure 6 gives the precipitation anomaly forced by the SSTA of positive
phase of the PIM. We can find that substantial negative anomaly occurs in
Indian Peninsula, Indochina, and Indonesia, which is quite consistent with
Fig. 5(b). But it differs from Fig. 5(a) of ENSO. The numerical results
can be compared well with the observation evidence. The positive rainfall
anomaly occurs from Southwest China to Northeast China with center in
Sichuan Province and Guizhou Province of China and Korea in numerical
simulation. The Changjiang-Huaihe River Basin and large part of South
China also get more rainfall. This indicates that the numerical results in
most area of China are the same as those observed. But in few areas of China
the numerical results do not agree with those observed. The mechanism of
summer precipitation in China is complex and middle-high latitudes are not
all influenced by SSTA. Collectively, the numerical results are comparable
well with those observed. The numerical simulation further indicates that
the PIM has important impact on Asian climate which differs from that of
ENSO mode.
