末次冰消期内印度洋海温对冰盖融水响应的模拟研究

Response of the Melt Water Flux to the Indian Ocean Temperature Variability in the Last Deglaciation

摘要: 第一次海因里希事件(H1)时期大西洋经向翻转流(AMOC)减弱，导致北半球变冷。代理指标表明在这一时期印度洋北部的表层温度变冷而次表层出现增暖。在本文中，我们发现由于北半球的冰盖融化，大量淡水进入北大西洋，导致AMOC在H1早期迅速减弱。这一过程使得北半球变冷，南半球变暖，热量在南大洋次表层堆积，进而生成南大洋中层水(SOIW)。与此同时，南极海冰融化，上升流加强，促进了SOIW的形成。由此产生的SOIW向北移动到印度洋，导致了印度洋次表层的变暖。

Abstract: During the phase of the Atlantic meridional overturning circulation (AMOC) stagnation in the Heinrich Event 1 (H1) period, the northern hemisphere generally became cold. Combined with the proxy data, it is found that the surface temperature of the Indian Ocean decreases during this stage, while the temperature of the subsurface increases. In this paper, we found that due to the addition of melting flux in the northern hemisphere, AMOC weakens rapidly in the early H1 period, which in turn causes the cooling in the Northern Hemisphere, the warming in the southern hemisphere, and subsequently leading to heat accumulation in the subsurface of the Southern Ocean and the formation of the Southern Ocean intermediate water (SOIW). At the same time, the Antarctic sea ice melted and the upwelling flow strengthened, promoting the formation of the SOIW. The resulting SOIW moves northwards into the Indian Ocean, which is responsible for the subsurface warming in the Indian Ocean.