Global and regional perspectives of Pleistocene paleoceanography in the western Pacific warm pool based on new sites from IODP Expedition 363

基于 IODP 363 号远征新地点的西太平洋暖池更新世古海洋学的全球和区域视角

• 批准号: 1834208
• 负责人: Yair Rosenthal
• 金额: $ 51.33万
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1834208&HistoricalAwards=false
• 关键词: Global; regional; perspectives; Pleistocene; paleoceanography

The Western-Pacific Warm Pool (WPWP) is a major source of heat and moisture to the atmosphere, being a region of deep atmospheric convection and heavy rainfall. Small perturbations in sea surface temperature of the WPWP influence the location and strength of convection in the rising limb of the Hadley and Walker circulations, perturbing planetary scale atmospheric circulation, atmospheric heating, and tropical hydrology, as well as heat and CO2 storage in the thermocline and their transport to the Indian Ocean through the Indonesian Throughflow. Models disagree how departures from modern climatology will affect the hydroclimate conditions in this area i.e., whether more intense droughts or stronger monsoonal rains should be expected. Either way, these changes can disrupt the lives of many people in regions so affected, devastating local economies of heavily populated regions through crop failure, landslides, flooding of coastal regions, and loss of human and wild lives. International Ocean Discovery Program (IODP) Expedition 363 sought to document the regional expression and driving mechanisms of climate and paleoceanographic variability throughout the Neogene (~0-20 My) in the WPWP on millennial and orbital time scales in response to changes in radiative forcing and varying background climate states, in order to improve predictions of climate change in this region. This award supports research on two of the cores collected during Expedition 363. Orbital-scale benthic isotope record will be generated at Site U1486 in the Manus Basin, ~200 km north of Papua New Guinea (PNG) spanning the late Pliocene (~2.25 Ma) to Present. The oxygen isotope stratigraphy will be key for interpreting proxy reconstructions of hydroclimate variability obtained at this site, including XRF analysis of terrigenous riverine inputs originated from PNG and planktonic foraminiferal isotope and elemental records. Benthic foraminifera carbon isotope and trace metal records will be used to assess how changes in intermediate water temperature and carbon content affected the WPWP hydrography through the mid-to-late Pleistocene and their implications to the regional and global climate. A second site (U1485) on the northern margin of PNG close the Sepik/Ramu River mouths, characterized by very high sedimentation rates, will be used to reconstruct climate conditions during previous interglacials of the past 500 My. Specifically, both planktonic and benthic isotope and elemental records will be generated for Termination I and the Holocene, and compared with Terminations II and IV and the following warmer-than-present interglacial peaks (i.e., Eemian/ MIS 5e and MIS 11) to assess how the WPWP upper ocean responded to deviations from boundary conditions similar to those predicted for the next century. Funding supports a postdoctoral scientist and research opportunities for undergraduate studentsThis award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

西部太平洋暖游泳池（WPWP）是大气中的热量和水分的主要来源，是深度大气对流和大雨的地区。 WPWP海面温度的小扰动会影响Hadley和Walker循环上升的肢体上升的对流的位置和强度，扰动行星尺度大气循环，大气加热和热带水文，以及热量线中的热和CO2存储以及他们通过印度尼西亚人的遍布运输到印度洋。 模型不同意现代气候学如何影响该地区的氢气候条件，即应预期更激烈的干旱或更强烈的季风降雨。 无论哪种方式，这些变化都会通过作物失败，山体滑坡，沿海地区的洪水以及人类和野生生活的丧失，破坏受影响的地区，毁灭人口稠密地区的地方经济的许多人的生活。国际海洋发现计划（IODP）Expedition 363试图记录WPWP中千禧一代和轨道时间尺度的全新新金元（〜0-20 M y）的气候和古环境变异性的区域表达和驱动机制。不同的背景气候状态，以改善该地区气候变化的预测。该奖项支持对探险期间收集的两个核心的研究。轨道尺度的底栖同位素记录将在跨Papua New Guinea（PNG）以北约200公里的Manus Basin的现场U1486生成。 ）。氧同位素地层学将是解释该站点获得的氢化气候变异性的替代重建的关键，包括XRF分析源自PNG和浮游有孔虫同位素和元素的陆河河流输入。 底栖有孔虫的碳同位素和痕量金属记录将用于评估中间水温和碳含量的变化如何通过中期更新世的中期影响WPWP水文及其对区域和全球气候的影响。 PNG北部边缘的第二个地点（U1485）关闭了以非常高的沉积速率为特征的Sepik/Ramu河口，将用于重建过去500 MY的先前冰川间气候条件。 具体而言，将生成用于终止I和全新世的浮游和底栖同位素和元素记录，并与终止II和IV以及以下温暖的冰期间峰（即EEMIAN/ MIS 5E和MIS 11）进行比较，以评估WPWP上海如何响应与下一世纪预测的边界条件的偏差。资金支持本科生的博士后科学家和研究机会，这反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛的影响评估标准来评估值得支持的。

项目成果

Climate, sea level and tectonic controls on sediment discharge from the Sepik River, Papua New Guinea during the Mid- to Late Pleistocene

• DOI: 10.1016/j.margeo.2019.05.013
• 发表时间: 2019-09
• 期刊: Marine Geology
• 影响因子: 2.9
• 作者: I. Aiello;S. Bova;A. Holbourn;D. Kulhanek;A. Ravelo;Y. Rosenthal

Cyclic evolution of phytoplankton forced by changes in tropical seasonality

• DOI: 10.1038/s41586-021-04195-7
• 发表时间: 2021-12-01
• 期刊: NATURE
• 影响因子: 64.8
• 作者: Beaufort, Luc;Bolton, Clara T.;Tetard, Martin
• 通讯作者: Tetard, Martin

Non-trivial role of internal climate feedback on interglacial temperature evolution

内部气候反馈对间冰期温度演化的重要作用

• DOI: 10.1038/s41586-021-03930-4
• 发表时间: 2021
• 期刊: Nature
• 影响因子: 64.8
• 作者: Zhang, Xu;Chen, Fahu
• 通讯作者: Chen, Fahu

Warm pool ocean heat content regulates ocean–continent moisture transport

• DOI: 10.1038/s41586-022-05302-y
• 发表时间: 2022-10
• 期刊: Nature
• 影响因子: 64.8
• 作者: Z. Jian;Yue Wang;H. Dang;M. Mohtadi;Y. Rosenthal;D. Lea;Zhongfang Liu;Haiyan Jin;Liming Ye

Reply to: Non-trivial role of internal climate feedback on interglacial temperature evolution

回复：内部气候反馈对间冰期温度演化的重要作用

• DOI: 10.1038/s41586-021-03931-3
• 发表时间: 2021
• 期刊: Nature
• 影响因子: 64.8
• 作者: Bova, Samantha;Rosenthal, Yair;Liu, Zhengyu;Yan, Mi;Broccoli, Anthony J.;Godad, Shital P.;Zeng, Cheng
• 通讯作者: Zeng, Cheng