The Tropical Marine’s Effect On Interannual Variability Of The South China Sea Summer Monsoon

In this paper, Currently a large number of studies have shown that summer monsoon intensity and tropical ocean forcing closely related, this balancing feedback analysis using generalized decomposition of the five major sea areas surrounding the South China Sea, and the use of truncated EOF way quantified for each basin SCSSM The first three SSTA modal response, then the response of the basin’s contribution to atmospheric conditions through the use of high-resolution coupled ocean-atmosphere model SINTEX-F simulation results of two simulations discussed further in the tropical Pacific, the South Pacific Sea temperature anomaly modal, tropical Indian ocean, the South Indian Ocean on the possible impact SCSSM mechanisms, mainly the following conclusions:(A) The following SCSSM mainly SSTA forced modal response is remarkable: the tropical Pacific first mode (TP1), the tropical Pacific, the second mode (TP2), the South Pacific first mode (SP1), the tropical Indian Ocean first mode (TI1), South Indian Ocean first mode (SI1), in which the first mode of the equatorial Pacific (TPl) response maximum response amplitude is highest for the second mode type equatorial Pacific SST forcing (TP2) with its first mode (TP1) response to the contrary.(2) TPl type of SSTA WALKER addition to causing abnormal circulation anomalies, the most notable is over the ocean east of the Philippines produces cyclonic (anticyclonic) circulation type, possibly by affecting the East Asian subtropical high over the same period to the right SCSSM impact, TP2has a similar effect mechanism, when TP1was La Nina (El Nino) type SST Anomalies, the adjacent sea area geopotential height field weakening (enhancement) will have (not) to wear conducive to its upstream westerly Over the Bay of Bengal into the South China Sea area and the South China Sea equatorial flow of strengthening and promoting (inhibiting) South China Sea area convective development, most of the time, TP1and TP2trends consistent, TP2role is weakening TP1effects, and in some very special time It can replace the atmosphere caused TPl become major factors affecting; SP1-based SSTA is by influencing Australia Northern Hemisphere subtropical high pressure and subtropical regions of the impact on the summer monsoon, in addition, the first South Pacific SST modal (SP1) and ENSO are closely linked in the same period, with the contemporaneous correlation between ENSO maximum as the main feature. Judging from its cycle, SP1in mid and high latitudes showed similar PDO and the North Pacific decadal variability as the main feature, while in low latitudes is mainly manifested as close conjunction with ENSO2-3a interannual variability.(3) consistent with the tropical Indian Ocean region type (TI1) warming (cooling) inspired from the Indian Ocean to the western Pacific Walker circulation anomalies circle, can enhance (weaken) anomalies over the western Pacific vertical downward motion to suppress (Promotion) of convective activity, the West Pacific subtropical high was thus enhanced westward (eastward weakening), in the process of monsoon onset hampered the Indian Ocean to the South China Sea summer monsoon circulation promotion, allowing monsoon onset and late (partial early); Indian Ocean Dipole mode (TI2), in the positive (negative) dipole years, the tropical Indian Ocean air-sea interaction can stimulate the tropical western Pacific northerly generate cyclonic (anticyclonic) circulation, And in the tropical Indian Ocean local northerly (South) Regional inspire anticyclonic (cyclonic) gyre, the two correspond to each other weakened (strengthened) west equatorial zonal wind, and meridional southerly winds, is not conducive to (have conducive to) the development of South China Sea summer monsoon, in addition, from the sea surface temperature distribution, the negative (positive) dipole events are usually accompanied by the eastern equatorial Pacific LA Nina (El Nino) type SST anomaly; South Indian Ocean first mode (SI1) and the tropical Indian Ocean, the first state with a similar change modal characteristics, but because the two were sentenced to northern and southern hemispheres, SI1and TI1atmospheric response is often reversed, and the difference is SI1TI1through first changing land-sea thermal underlying surface, which can then affect the cross-equatorial flow through the Northern Hemisphere summer monsoon impact.