Spatial fingerprint and magnitude of changes in the Atlantic meridional overturning circulation during marine isotope stage 3
Spatial fingerprint and magnitude of changes in the Atlantic meridional overturning circulation during marine isotope stage 3
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DOI：
10.1002/2014gl063003
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发表时间：
2015-03
影响因子：
5.2
通讯作者：
X. Zhang;M. Prange;U. Merkel;M. Schulz
中科院分区：
文献类型：
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作者：
X. Zhang;M. Prange;U. Merkel;M. Schulz
海洋同位素阶段3（MIS 3）期间显著的千年尺度气候变率被认为与大西洋纬向翻转环流（AMOC）状态的变化有关，即，热的阶间/冷的阶状态对应于强/弱的AMOC。基于最先进的社区气候系统模型第3版的一系列淡水冲洗/提取实验，我们构建了MIS 3边界条件下海洋温度异常响应AMOC变化的全球空间指纹。对AMOC变化的最高敏感性，特别是在夏季，发现在北大西洋东北部的海面温度，但特征温度指纹也发现在次表层。在测试了线性海表温度（SST）-AMOC回归的显著性后，将模型结果与古SST记录相结合，以估计MIS 3期间千年尺度的Dansgaard-Oeschger AMOC变化的幅度。结果表明，间期和（非Heinrich）间期状态之间AMOC强度的平均差异为9.2 ± 1.2 Sv（1σ）。
Pronounced millennial‐scale climate variability during marine isotope stage 3 (MIS3) is considered to be linked to changes in the state of the Atlantic meridional overturning circulation (AMOC), i.e., a warm interstadial/cold stadial state corresponds to a strong/weak AMOC. Based on a series of freshwater hosing/extraction experiments with the state‐of‐the‐art Community Climate System Model version 3, we construct a global spatial fingerprint of oceanic temperature anomalies in response to AMOC changes under MIS3 boundary conditions. Highest sensitivity to AMOC changes, especially in summer, is found in northeastern North Atlantic sea surface temperature, but a characteristic temperature fingerprint is also found at subsurface levels. After testing significance of the linear sea surface temperature (SST)‐AMOC regressions, the model results are combined with paleo‐SST records to estimate the magnitude of millennial‐scale Dansgaard‐Oeschger AMOC variations during MIS3. The results suggest a mean difference in AMOC strength between interstadial and (non‐Heinrich) stadial states of 9.2 ± 1.2 Sv (1σ).