晚新生代西太平洋古海洋环境演化过程与机制

晚新生代西太平洋通过水文循环和碳循环两类关键过程，对区域乃至全球气候变化产生深刻的影响。本文从上新世以来西太暖池及其主流系演化、晚第四纪北太平洋中层水演化和白令海峡开合、第四纪中国东部陆架环境演化以及新生代亚太沉积物源-汇过程与碳埋藏等方面，综述了西太平洋古海洋环境演化过程与机制。上新世以来西太暖池与印尼贯穿流的演化过程伴随构造运动而阶段性地发生，但其在轨道时间尺度上演化的细节过程并不清晰，尚未形成系统性认识。北太平洋中层水以及白令海峡开合等关键高纬过程在冰期旋回中发生了显著变化，并与低纬过程之间存在遥相关。第四纪中国东部陆架环境演化主要受控于海平面变化以及与低纬过程相关联的热量与物质传输，在此背景下，中国东部陆架形成了富有机碳的泥质沉积体系。构造隆升和亚洲季风驱动下的亚洲大陆与邻洋的沉积物源-汇过程具有显著的碳汇效应，可能在大气CO₂浓度（${p_{{\rm{C}}{{\rm{O}}_2}}} $）冰期旋回和新生代气候变冷中发挥重要作用。就西太平洋古海洋环境演化过程与机制中若干关键科学问题开展深入和系统研究，不仅可为建立气候变化的低纬驱动理论提供支撑，也可为更好认识我国陆架环境变化规律以及碳汇潜力提供科学依据。

Evolution and Mechanism of the Paleoceanographic Environment in the Western Pacific During the Late Cenozoic

The Western Pacific has a significant impact on regional and global climate changes through the hydrological and carbon cycles during the late Cenozoic. In the present paper, we review the evolution and mechanism of the paleoceanography and paleoenvironment in the Western Pacific from the following aspects: the Pliocene evolutions of the Western Pacific Warm Pool and its main current, the late Quaternary evolutions of the North Pacific Intermediate Water and the Bering Strait opening and closing, the Quaternary evolution of shelf environment in the Eastern China, and the source-to-sink process and carbon burial of the Cenozoic Asia-Pacific sediments. Since the Pliocene, the evolutions of the Western Pacific Warm Pool and the Indonesian throughflow has formed in stages along with tectonic movements, but the details of their evolutions on the orbital timescales are still not clear. Key high-latitude processes such as the North Pacific Intermediate Water and the Opening and Closing of the Bering Strait have varied significantly during glacial-interglacial cycles and are remotely correlated with low-latitude processes. The evolution of Quaternary shelf environment in the Eastern China is mainly controlled by sea level fluctuation and the heat- and material- transfer associated with low-latitude processes. Under these conditions the Shelf has formed a slurry sedimentary system rich in organic carbon. Sediment source-to-sink processes in continental Asia and adjacent oceans driven by tectonic uplift and Asian monsoons have significant carbon sink effects and may have played an important role in the glacial-interglacial atmospheric carbon dioxide concentration (${p_{{\rm{C}}{{\rm{O}}_2}}} $) variations and the Cenozoic climate cooling. Conducting in-depth and systematic research on a number of key scientific issues in the evolution and mechanism of the paleoceanography and paleoenvironment in the Western Pacific Ocean can not only provide a basis for establishing the theory of low-latitude forcing of climate change, but also may help to improve our understanding of the environmental change and the carbon sink potential of China''s continental shelf.