INVESTIGATING THE CAUSE AND STRUCTURE OF ABRUPT CLIMATE CHANGE EVENTS IN MARINE OXYGEN ISOTOPE STAGE 11

在过去的260万年里，地球的气候在寒冷和温暖的阶段之间振荡，称为冰川-间冰期循环。为了更好地了解气候反应，有必要寻找与当今条件相似的时期。一个时期，被称为海洋氧同位素阶段（MIS）11（约430，000年前），其重要性日益增加：1）与今天相似的温暖时期，2）格陵兰岛冰大量流失的时期。格陵兰岛的淡水融化被认为会扰乱海洋环流，从而导致北方气候不稳定，而海洋环流通常会将温暖的海水带到高纬度地区。其中一个发生这种情况的时间被称为MIS 11中的“非树栖花粉阶段”，这在整个欧洲都可以看到。这是一个条件突然变冷的时期，抑制了大树的生长。该事件的原因尚不清楚。这个博士项目旨在通过以下方式解决这个问题：（1）为记录事件的古湖盆地制作高分辨率的温度和干旱记录（2）在北大西洋的多个海洋站点调查这一事件（3）建立导致这一事件的驱动因素。

Throughout the last 2.6 million years the earth's climate has oscillated between cold and warm phases, known as Glacial-Interglacial cycles. To better understand climatic responses, it is necessary to look for periods with similar conditions to present day. One period, known as Marine Oxygen Isotope Stage (MIS) 11 (~430,000 years ago) is of growing importance as; 1) a similar warm period to present day, and 2) a time of significant Greenland ice loss. Freshwater melt from Greenland is thought to cause climatic instability in the northern hemisphere by disrupting ocean circulation, which normally brings warm water to the higher latitudes. One such time where this occurred is referred to as "The Non-Arboreal Pollen Phase" in MIS 11, which is seen across Europe. This is a time where conditions abruptly became colder, inhibiting the growth of large trees. The cause of this event is not well understood. This PhD project aims to resolve this by (1) producing high-resolution temperature and aridity records for palaeolake basin(s) that record the event (2) investigating this event in multiple marine sites across the North Atlantic (3) establishing the driving factors responsible for this event.