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，海洋的温盐环流在触发——或至少是放大——千年的过程中起了至关重要的作用！海洋同位素阶段3 （MIS3）期间的尺度气候变率。传送带的温水路线在这个冰期间的作用是令人费解的。印尼通流（ITF）和阿古拉斯泄漏可能被认为是温水路线的关键组成部分。这些瓶颈的干扰可能以几种方式影响气候系统，影响大规模的海洋热输送以及季风和厄尔尼诺/南方涛动动力学。利用一个新的综合全球气候模式，我们将评估冷静/暖静间演替对MIS3气候的影响，并特别关注暖水路径的变率。我们将分析ITF、Agulhas泄漏与北大西洋深水形成、副热带锋的位置、海洋盆地盐度平衡以及大气和海洋热输送之间的远距联系。此外，季风和ENSO动力学以及印度偶极子模式将被检查为MISS静期和间期气候状态。该项目将受益于与来自基尔工作组的海洋地质学家的密切合作，他们将为MIS3提供基于数据的百年时间尺度的ITF估计。

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.