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CONTINENTAL CLIMATE RESPONSE TO ORBITAL FORCING FROM BIOGENIC SILICA RECORDS IN LAKE BAIKAL

机译:贝加尔湖生物成因硅记录对轨道强迫的持续气候响应

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CHANGES in insolation caused by periodic changes in the Earth's orbital parameters provide the primary forcing for global ice ages(1-6). But it is not clear to what extent the climates in continental interiors are controlled directly by regional variations in insolation and to what extent they are driven instead by the highly nonlinear response of the oceans and ice sheets, Here we investigate this question using the record of biogenic silica in Lake Baikal as a proxy for climate change in this high-latitude mid-continental region, We find a good correlation between this record and that of marine oxygen isotopes(4). Over the past 250 kyr the Baikal record exhibits both a strongly nonlinear component (manifested in a 100-kyr periodicity) and weaker direct-insolation components (manifested in the 41-kyr (obliquity) and 23- and 19-kyr (precession) orbital cycles). These results show that even though extreme continental climates such as this are influenced directly by insolation variations, they are dominated by the nonlinear rhythm of the oceans and ice sheets.
机译:由地球轨道参数的周期性变化引起的日照变化为全球冰河时期提供了主要强迫(1-6)。但是,尚不清楚大陆内部的气候在多大程度上是由日照的区域性变化直接控制的,以及它们在多大程度上是由海洋和冰盖的高度非线性响应驱动的,在这里,我们使用贝加尔湖中的生物成因二氧化硅是该高纬度中大陆地区气候变化的代名词,我们发现该记录与海洋氧同位素的记录之间有很好的相关性(4)。在过去的250年中,贝加尔湖的记录既显示出强烈的非线性成分(表现为100 kyr的周期性),又显示出较弱的直射成分(表现为41 kyr(倾斜)和23以及19 ky(旋进)的轨道)周期)。这些结果表明,即使像这样的极端大陆性气候直接受到日照变化的影响,但它们仍受海洋和冰盖的非线性节律的支配。

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