Solar Forcing of ENSO on Century Timescales

被引：7

作者：

Wilcox, Paul S. ^{[1
]}

Mudelsee, Manfred ^{[2
]}

Spoetl, Christoph ^{[1
]}

Edwards, R. Lawrence ^{[3
]}

机构：

[1] Univ Innsbruck, Inst Geol, Innsbruck, Austria

[2] Climate Risk Anal, Bad Gandersheim, Germany

[3] Univ Minnesota, Dept Earth Sci, Minneapolis, MN USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2023年 / 50卷 / 20期

基金：

奥地利科学基金会;

关键词：

ENSO; North Pacific; speleothems; anthropocene; LAST; 2000; YEARS; NORTH PACIFIC; EL-NINO; OXYGEN ISOTOPES; ICE-AGE; CLIMATE; TELECONNECTIONS; VARIABILITY; OSCILLATION; CIRCULATION;

D O I：

10.1029/2023GL105201

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Understanding how El Nino-Southern Oscillation (ENSO) responds to natural variability is of key importance for future climate projections under a warming climate. However, there is no clear consensus on what drives ENSO's variability on centennial timescales. Here, we find that the epikarst in southeastern Alaska is effective at filtering ENSO and solar irradiance signals from the Aleutian Low regional climate, which are subsequently recorded in speleothem proxy data. By applying a correlation test, we find that ENSO was significantly influenced by solar irradiance over the past similar to 3,500 years. This relationship dissolved after similar to 1970 CE, with ENSO now being dominated by anthropogenic forcing. This implies a new ENSO mean state that will need to be incorporated into future climate projections.

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页数：11

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