Does an Intrinsic Source Generate a Shared Low-Frequency Signature in Earth’s Climate and Rotation Rate?

Earth Interactions

Steven L.Marcus¹ 

关键词: Physical meteorology and climatology;    Climate change;    Temperature;    Mathematical and statistical techniques;    Time series;    Variability;    Multidecadal variability;   

DOI  :  10.1175/EI-D-15-0014.1

学科分类：地球科学(综合)

来源: American Geophysical Union

【 摘 要 】

AbstractPrevious studies have shown strong negative correlation between multidecadal signatures in length of day (LOD)—an inverse measure of Earth’s rotational rate—and various climate indices. Mechanisms remain elusive. Climate processes are insufficient to explain observed rotational variability, leading many to hypothesize external (astronomical) forcing as a common source for observed low-frequency signatures. Here, an internal source, a core-to-climate, one-way chain of causality, is hypothesized. To test hypothesis feasibility, a recently published, model-estimated forced component is removed from an observed dataset of Northern Hemisphere (NH) surface temperatures to isolate the intrinsic component of climate variability, enhancing its comparison with LOD. To further explore the rotational connection to climate indices, the LOD anomaly record is compared with sea surface temperatures (SSTs)—global and regional. Because climate variability is most intensely expressed in the North Atlantic sector, LO...

【 授权许可】

Unknown