海洋在调节大气pCO2变化中起关键作用，以暖池为主体的热带西太平洋作为全球海-气交换最强烈的区域，是探索大气pCO2冰期旋回机制的理想海区。本研究以热带西太平洋的生物拖网、表层沉积物和岩芯为材料，以碳酸盐系统参数的演变为切入点，将现代过程与地质记录结合，应用浮游有孔虫壳重、B/Ca、δ11B、Mg/Ca和δ18O等指标，在对以往pH、[CO32-]经验估算公式标定的基础上，获得该区0.8 Ma以来上层水体pH、[CO32-]和pCO2演化记录，查明其垂向梯度和空间变化特征，分析其与系统内部温盐、生产力、跃层深度等环境要素的关联，探讨热带过程在其演变中的重要作用。在此基础上，再与南极冰芯中大气pCO2记录进行对比，探寻是否有热带驱动因素和暖池在全球碳循环和气候变化中起作用。

The ocean plays a key role in modulating the atmospheric partial pressure of carbon dioxide (pCO2). As one of the sea area with most fast exchange rate with the atmosphere, the tropical West Pacific with the main body of warm pool is an ideal area for solving the exact causes of glacial-interglacial pCO2 cycles. Based on the samples of plankton trawls, surface sediments and sediment cores, and beginning from the evolution of carbonate chemical system parameters, we reconstructed the history of pH, carbonate ion concentration ([CO32-]) and pCO2 variations in the upper water from tropical West pacific over the last 0.8 Ma, by applying multi-proxies of planktic foraminiferal shell weight, B/Ca,δ11B, Mg/Ca and δ18O and calibrating the empirical formulas for the calculations of pH and [CO32-]. And then we investigated the vertical gradients and spatial differences of these carbonate system parameters, analyzed their correlations with other paleoceanographic factors such as temperature, salinity, productivity and thermocline/nutricline depths, and finally elucidated the important role of tropical processes in their variabilities. Furthermore, we explored the significances of tropical forcing and warm pool in global carbon cycles and climate changes, in base of the comparisions of pH, [CO32-] and pCO2 variations with atmospheric pCO2 fluctuations recorded in Antarctic ice cores.