The Study Of Indonesian Throughflow, Warm Pool And Chaotic Characteristics In Pacific And Indian Ocean

In this paper, The characteristics of variation and the mechanism of Indonesian ThroughFlow (ITF), Warm pool in tropical Western Pacific (WPPO) and Indian Ocean (WPIO) are studied with SODA, Levitus and COADS data. Numerical simulation of Indonesian ThroughFlow and its influence on Pacific Ocean and Indian Ocean as well as numerical study on chaotic characteristics in Pacific Ocean and Indian Ocean are made with MOM2.2. Using SODA data from Maryland University, the analysis about characteristics of ITF and its mechanism is taken. Based on Island rule and large-scale pressure gradient, the variation mechanism of ITF is analyzed. It is found that low frequency ITF's transport is mainly determined by South Pacific and Equatorial Pacific zonal wind. The phase of ITF's decadal variation is mainly related to Equatorial zonal wind. ITF's seasonal and inter-annual variation has a good relationship with large-scale pressure gradient between Pacific Ocean and Indian Ocean. The characteristics and mechanism of WPPO and WPIO are studied. The results show that ITF is one of important factors of WPPO and WPIO heat budget and the main variation period of WPPO and WPIO are different. WPIO has high frequency variation. The decadal variation of WPPO is mainly determined by decadal variation of Sverdrup transport in south boundary. The decadal variation of WPIO is controlled by thermocline's decadal adjustment. The numerical study with MOM2.2 shows that the seasonal patterns are different among the three main paths of Indonesian ThroughFlow. The transport in the South China Sea is large in winter and small in summer. ITF's transport at entrance to Indian Ocean is in the accepted range from former investigation and numerical study. With comparison experiments with closed and opened ITF paths, It is proved that the Indonesian Throughflow has a significant influence on fluid fields and thermal structure of Pacific Ocean and Indian Ocean. With closed ITF path, The temperature in Indian Ocean is reduced but not vice versa in Pacific Ocean. There is strap-shaped region with increased temperature and decreased temperature. SEC velocity in South Indian Ocean and SEC, NEC and EUC in Pacific Ocean is decreased, the speed of SECC in Indian Ocean and the speed of SECC, NECC in Pacific Ocean is increased. The resolution in ITF region is found to influence ITF's transport and seasonal variation. It is verified that ITF is an important factor of Pacific and Indian Ocean. It will be helpful to simulate Pacific and Indian Ocean more accurately that ITF's connection is considered in more detail. Numerical study on chaotic phenomena in Pacific and Indian Ocean is done based on the numerical simulation about ITF. It is found that the chaotic region mainly confined to the upper 210 meters between 15°S and 15°N with a characterization of Equator trapped and is deeper in the West and shallower in the East. The chaotic region in the west boundary region in Pacific, especially the region related to Kuroshio in Northwest Pacific, can remain to the deep region. There is a chaotic region in the Northeast corner of North Pacific subtropical Gyre which can remain chaotic to the deep region. Chaotic region in Indian Ocean shows different characteristics with Pacific Chaos was mainly confined to upper 220 meters in north side of 10°S in Indian Ocean. The west boundary region in Indian Ocean remains deep too. The kinetic characteristic analysis about chaotic region shows that chaos and its distribution is related to velocity and high velocity gradient distribution. By comparing with former study, the defects of former study are pointed out and reason for the difference is given. It is still rare to study chaos in real oceans with OGCM. The velocity shear as direct reason for chaos is first brought forth in the paper.