期刊
GEOPHYSICAL RESEARCH LETTERS
卷 48, 期 22, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GL095023
关键词
Atlantic Multidecadal Oscillation; Atlantic Multidecadal Variability; climate variability; climate change
资金
- National Center for Atmospheric Research
- National Science Foundation [1852977]
The study evaluates the skill of two methods in capturing the spatial pattern of internal AMV, with the first method mistakenly attributing the structure of forced climate change onto internal AMV, while the second method shows robustness to climate change. The models simulate realistic patterns of internal AMV, but the assessment is hindered by the brevity of the observational record.
The canonical index of Atlantic Multidecadal Variability (AMV) is the low-pass filtered timeseries of sea surface temperature anomalies (SSTA) averaged over the North Atlantic. This index and its associated SSTA spatial pattern confound externally forced climate change and internally generated climate variability. The internal component of AMV is commonly isolated by either subtracting the global-mean SSTA or removing the pattern of SSTA associated with the global-mean. This study evaluates the skill of each method with regard to the spatial pattern of internal AMV, using nine coupled model Large Ensembles over the period 1940-2100 as a testbed in which the true internal AMV is known a priori. The first method aliases the structure of forced climate change onto internal AMV, while the second method is generally robust to climate change. The models simulate realistic patterns of internal AMV, although such an assessment is hampered by the brevity of the observational record.
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