Does External Forcing Interfere with the AMOC’s Influence on North Atlantic Sea Surface Temperature?
Does External Forcing Interfere with the AMOC’s Influence on North Atlantic Sea Surface Temperature?
复制标题
外部强迫是否会干扰 AMOC 对北大西洋海面温度的影响？
DOI：
10.1175/jcli-d-14-00664.1
复制
发表时间：
2015
影响因子：
4.9
通讯作者：
P. Kushner
中科院分区：
文献类型：
--
作者：
Neil F. Tandon;P. Kushner
摘要大量研究表明，大西洋纬向翻转环流（AMOC）强度的变化可能驱动北大西洋海表温度（NASST）的可预测变化。然而，最近的两项研究提出的结果表明，耦合模型不同意的符号和阶段的AMOC和NASST指数之间的相关性。这些研究分析了耦合模式相互比较项目（CMIP 3和CMIP 5）第3和第5阶段20世纪历史模拟的线性去趋势输出。本研究认为，模型之间的明显分歧源于两个过程的混合：1）自下而上的效应，其中非强迫AMOC变化导致NASST变化的相同符号和2）自上而下的效应，其中强迫NASST变化导致AMOC变化的相反符号。线性去趋势不适合分离这两种效应，因为强迫和非强迫变化的时间尺度没有很好地分离。...
AbstractNumerous studies have suggested that variations in the strength of the Atlantic meridional overturning circulation (AMOC) may drive predictable variations in North Atlantic sea surface temperature (NASST). However, two recent studies have presented results suggesting that coupled models disagree on both the sign and the phasing of the correlation between AMOC and NASST indices. These studies analyzed linearly detrended output from twentieth-century historical simulations in phases 3 and 5 of the Coupled Model Intercomparison Project (CMIP3 and CMIP5). The present study argues that the apparent disagreement among models arises from a comingling of two processes: 1) a bottom-up effect in which unforced AMOC changes lead to NASST changes of the same sign and 2) a top-down effect in which forced NASST changes lead to AMOC changes of the opposite sign. Linear detrending is not appropriate for separating these two effects because the time scales of forced and unforced variations are not well separated. ...
影响因子：
4.6
作者：
Ba, Jin;Keenlyside, Noel S.;Volodin, Evgeny
通讯作者：
Volodin, Evgeny