Variability of the oceanic warm water route during marine isotope stage 3 - Investigations with a comprehensive coupled climate model

古海洋学证据表明，在海洋-同位素阶段3(MIS3)期间，海洋S温盐环流在触发-或至少放大-千年尺度的气候变化方面发挥了关键作用。传送带S温水路线在这段冰川时间段的作用是个谜。印度尼西亚的Throughflow(ITF)和Agulis泄漏可能被认为是温水路线的关键组成部分。这些瓶颈的扰动可能会以多种方式影响气候系统，影响大尺度海洋热量输送以及季风和ENSO(厄尔尼多/南方涛动)动力学。利用一个新的综合全球气候模式，我们将特别注意暖水路径的可变性，评估冰冷/暖间气候变化对MIS3气候的影响。我们将分析ITF、阿古利斯泄漏与北大西洋深水形成、副热带锋面位置、大洋盆地盐度平衡以及大气和海洋热量输送之间的遥相关。此外，还将研究季风和ENSO动力学以及印度偶极子模式，以确定夏季和洲际气候状态。该项目将受益于与设在基尔的工作组的海洋地质学家的密切合作，后者将就MIS3的百年时间尺度提供基于数据的国际信托基金估计数。

Paleoceanographic evidence suggests that the ocean s thermohaline circulation played a crucial role in triggering - or at least amplifying - millennia!-scale climate variability during Marine-Isotope Stage 3 (MIS3). The role of the conveyor s warm water route during this glacial interval is enigmatic. The Indonesian Throughflow (ITF) and Agulhas leakage may be considered key components for the warm water route. Disturbances of these bottlenecks may affect the climate system in several ways, influencing large-scale oceanic heat transports as well as monsoon and ENSO (El Nido/Southern Oscillation) dynamics. Using a new comprehensive global climate model, we will assess the effects of cold stadial/ warm interstadial successions on the climate of MIS3 with a particular eye towards the variability of the warm water path. We will analyze teleconnections between the ITF, Agulhas leakage and North Atlantic deep-water formation, the position of subtropical fronts, salinity balances of ocean basins as well as atmospheric and oceanic heat transports. Moreover, monsoon and ENSO dynamics as well as the Indian Dipole Mode will be examined for MISS stadial and interstadial climate states. The project will benefit from a close cooperation with marine geologists from Kiel-based working groups who will provide data-based estimates of the ITF on centennial timescale for MIS3.