Recently, the Peng Shiqiu team of the State Key Laboratory of Tropical Marine Environment ( LTO ) of the South China Sea Institute of Oceanology, Chinese Academy of Sciences revealed the characteristics of long-term (temporal and spatial) changes in typical seasonal (winter, summer) effective wave heights and their impact mechanisms in the Northwest Pacific - South China Sea.
Research results Published in Climate Dynamics "Climate Dynamics" (the first author is Assistant Researcher Li Shaotian, and the corresponding authors are Researcher Li Yineng and Researcher Peng Shiqiu)
The research team constructed a sea-atmosphere coupling model and wave model covering the East Indian Ocean , South China Sea and Northwest Pacific, and formed a long-term wind - wave data set of the East Indian Ocean , South China Sea and Northwest Pacific ( 1981~2014 , 34 years) .
The horizontal resolution of this data set is 0.
25 °, and it contains elements such as 10- meter meridional wind and zonal wind at the sea surface, sea surface pressure, effective wave height, average wavelength, average wave period, and average wave direction .
Based on this data set, a systematic study was conducted on the long-term characteristics and influence mechanism of the effective wave height in the typical seasons (winter and summer) in the Northwest Pacific - South China Sea .
The results of the study show that for the winter, the regions with dramatic interannual changes in effective wave heights are distributed in the northern South China Sea and the Pacific east of the Philippine Islands, and are remotely related to ENSO events through the Philippine anticyclone : strong warm (cold) events in the equatorial central and eastern Pacific.
The Philippine anticyclone (cyclone) weakened (intensified) the East Asian winter monsoon, which led to the weakening (intensifying) of the wave height in the northern part of the South China Sea and the Pacific Ocean to the east of the Philippine Islands
On the other hand, the wave height changes in the northern part of the South China Sea and the Pacific Ocean east of Japan are affected by the Aleutian Low ( AL ), showing a northeast - southwest "dipole" shape, showing interdecadal changes
That is, as the AL center moves eastward and its intensity increases, the westerly wind in the mid-latitude Pacific Ocean increases and the wave height increases, while the northeast monsoon and wave height in the northern part of the South China Sea weaken
For the summer, the wave height changes in the tropical northwest Pacific are mainly controlled by strong typhoon activity (Figure 1a ), while the wave height changes in the central and southern South China Sea are affected by the South China Sea summer monsoon (Figure 1b ), both of which show interannual changes.
and by ENSO regulated
For example, the strong El Ni that occurred in the previous winter ? o The event caused the anticyclone in the Philippines to continue until the beginning of the next summer due to the positive feedback effect of the sea surface cooling of the western Pacific Ocean and the northeast trade wind, which weakened the South China Sea summer monsoon and the wave height in the central and southern South China Sea (Figure 1b )
Figure 1 ( a ) El Nino regulates the typhoon activity and wave height changes in the Northwest Pacific and ( b ) the mechanism of El Nino regulating the South China Sea summer monsoon and wave height changes in the central and southern South China Sea in the previous winter
The research results were introduced by the national key research and development plan, the National Natural Science Foundation of China (major projects, key projects and general projects), the Guangdong Special Support Program, the Southern Ocean Science and Engineering Guangdong Laboratory (Guangzhou) talent team introduced major special projects and The Chinese Academy of Sciences' Strategic Leading Science and Technology Project ( Type A ) was jointly funded and completed
Related paper information: Li, S.
, Li, Y.
* , Peng, S.
* , Qi Z.
The inter-annual variations of the significant wave height in the Western North Pacific and South China Sea region.
Clim Dyn .