Temperature Changes In The Upper Seawater Since MIS10 In The Eastern Timor Sea And The Implications For Global Climate Change

In recent years,the impact of climate change has intensified,and the issues of global warming has become more and more of the concern of the international community.Finding the factors controlling the impact of climate change,revealing the laws of climate evolution,and predicting the trend of climate change have become the common ideal and ultimate goal of climate research scholars.The Timor Sea is located in the southern part of the Indo-Pacific Warm Pool,southwest of the Western Pacific Warm Pool,which is crossed by Indonesian Throughflow,linking the Indian and Pacific Oceans and regulating water and heat transport between the two oceans,while climate change in the Warm Pool will also have an important impact,indirectly or directly,on climate change at high latitudes and globally.In this paper,by studying the cores of MD98-2172 in the Timor Sea Region,the stable oxygen isotopes of the benthic foraminifera Cibicidoides wuellerstorfi and Uvigerina.peregrina in the sediments of the cores were measured using paleo-oceanographic,meteorological and oceanographic methods,and the plotted curves were tuned to the LR04 to establish the chronological stratigraphic framework.For the Mg/Ca of Globigerinoides ruber were determined to reconstruct surface water temperature in the Timor Sea region since the last MIS10;For the Mg/Ca of Pulleniatina obliquiloculata were determined to reconstruct thermocline water temperature;changes in the extent and intensity of the warm pool area since MIS10 were explored by differencing them with surface seawater temperature data recorded in cores of the Western Pacific warm pool;the drivers of global climate change were discussed by comparing them with the insolation change curves,temperature changes measured in cores of other sea areas and polar ice cores,and changes in atmospheric CO2 content.The results of the study show that the surface seawater temperature in the Timor Sea area since MIS10 has a clear ice-phase-interglacial reversal characteristic;a comparison with the surface water temperature record of the core KX97322-4 of the warm pool shows a large temperature difference between the two in MIS2,3,4,6 and 10,which are relatively cold phases,indicating a decrease in the extent and intensity of the warm pool area during the cold period.Spectral analysis shows that some tropical sea areas are influenced by low-latitude processes and have significant ageing cycles,indicating that tropical climate change signals may be influenced by low-latitude and high-latitude processes;surface seawater temperature in tropical sea areas significantly exceeds changes in carbon dioxide concentration,proving that carbon dioxide radiative forcing is not the driver of global climate change,but rather that the driver of climate change at high and low latitudes may be ocean circulation and water mass.