Impact of Western Pacific Warm Pool variability on regional and global climate evolution during the late Miocene and early Pliocene

中新世晚期和上新世早期西太平洋暖池变率对区域和全球气候演变的影响

• 批准号: 387857866
• 负责人: Dr. Ann Holbourn
• 金额: --
• 依托单位: Institut für Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/387857866?language=en
• 关键词: Impact; Western; Pacific; Warm; Pool

As the warmest water body on the planet, the Western Pacific Warm Pool (WPWP) strongly influences the dynamics of the El Niño Southern Oscillation and the Asian-Australian monsoon system, affecting planetary-scale atmospheric circulation, atmospheric heating, and tropical hydrology. To date, there is considerable uncertainty regarding the response of the tropical Pacific climate to rising greenhouse gas concentrations and sea level due to our limited understanding of the WPWP past variability and conflicting results from data and model simulations.During IODP Expedition 363, an extended (sedimentation rate: ~6 cm/kyr), undisturbed upper Miocene to lower Pliocene hemipelagic succession was retrieved for the first time at the southwestern edge of the present day WPWP (Site U1482, 15°3.32 S, 120°26.10 E, water depth: 1466 m). This carbonate- and clay-rich sequence provides an ideal archive to document temperature and precipitation variations in the WPWP under different climate background states and to better constrain climate sensitivity in relation to changes in radiative forcing (CO2 and insolation). Using a combination of high-resolution ocean temperatures and salinity reconstructions (based on oxygen isotope and Mg/Ca analyses of mainly unaltered, glassy planktonic and intermediate water benthic foraminifers) and XRF-scanner derived monsoonal runoff records, we propose: 1) to monitor variations in the spatial extent of the WPWP in relation to high-latitude climate change on orbital timescales; 2) to investigate the relationships between changes in the Equator-to-pole temperature gradient and the long-term evolution of the Australian monsoon; 3) to assess changes in the zonal SST gradient of the tropical Pacific Ocean during intense, global cooling and warming episodes and 4) to evaluate the role of intermediate waters as a buffer of high-latitude climate variations during late Miocene and early Pliocene climate reversals.Our project will focus on the late Miocene to early Pliocene period, which represents a geologically recent, relatively warm climate phase that is considered a potential analog of future conditions on Earth. This interval was marked by several episodes of fundamental climate re-organization, offering a challenging opportunity to explore climate-carbon cycle dynamics on a warmer-than-today Earth as well as to investigate the impact of WPWP variations on the evolution of the Asian-Australian monsoon system and on zonal equatorial Pacific processes (e.g. past El Niño state) and, thus, to help guide models and constrain predictions of climate change and sensitivity.

作为地球上最温暖的水体，西太平洋温暖池（WPWP）强烈影响厄尔尼诺南部振荡的动态和亚洲 - 澳大利亚季风系统，影响了行星规模的大气循环，大气加热和热带水文。 To date, there is considerable uncertainty regarding the response of the tropical Pacific climate to rising greenhouse gas concentrations and sea level due to our limited understanding of the WPWP past variability and conflicting results from data and model simulations.During IODP Expedition 363, an extended (sedimentation rate: ~6 cm/kyr), undisturbed upper Miocene to lower Pliocene hemipelagic success was retrieved for the first time at the当今WPWP的西南边缘（站点U1482，15°3.32 S，120°26.10 E，水深：1466 m）。该碳酸盐和粘土富含的序列在不同的气候背景状态下为WPWP的温度和降水变化提供了理想的存档，并更好地约束气候敏感性，相对于辐射强迫的变化（CO2和分离）。结合使用高分辨率海洋温度和盐度重建（基于氧同位素和Mg/ca分析，主要是未更换的，玻璃浮游的和中间的水底栖有限孔）和XRF-Scanner派生的季风径流记录的XRF-SCANNER衍生记录，我们提出，我们提出了对跨度范围的变化范围：1）轨道时标； 2）研究赤道对极温度梯度的变化与澳大利亚季风的长期演变之间的关系； 3）评估在强烈，全球冷却和变暖过程中热带太平洋的区域SST梯度的变化，以及4）评估中间水作为中间水的高度气候变化的缓冲，在上新世晚期和上新世气候早期的气候逆转中，相对阶段的相对阶段的相对阶段是一定的一定时期的一定，该过程的相对阶段是一定的，它的相对阶段是一定的，它的相对阶段是一定的，该过程的相对时期是一定的。地球未来条件的潜在类似物。这个间隔的标志是基本气候重组的几个事件，为探索气候碳循环动态探索较温暖的地球上的气候 - 碳循环动态，以及研究WPWP变化对亚洲 - 澳大利亚 - 澳大利亚 - 澳大利亚季风系统的进化的影响，从而帮助Sonsoemot and Models and Ni Inini。预测气候变化和灵敏度。