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| 100 |
_a Zolitschka, Bernd _951565 |
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| 245 | _aSouthern Hemispheric Westerlies control sedimentary processes of Laguna Azul (south-eastern Patagonia, Argentina) | ||
| 260 |
_bsage _c2019 |
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| 300 | _aVol 29, Issue 3, 2019 : (403-420 p.). | ||
| 520 | _aMultiproxy investigations of lacustrine sediments from Laguna Azul (52 °S) document multi-millennial Holocene influences of Southern Hemispheric Westerlies (SHW) on the hydroclimatic variability of south-eastern Patagonia. During the last 4000 years, this hydroclimatic variability is overprinted by centennial warm/dry periods. A cool/wet period from 11,600 to 10,100 cal. BP is succeeded by an early Holocene dry period (10,100–8300 cal. BP) with a shallow lake, strong anoxia, methanogenesis and high salinity. Between 8300 and 4000 cal. BP the influence of SHW weakened, resulting in a freshwater lake considered to be related to less arid conditions. Since 4000 cal. BP, regional temperature decreased accompanied by re-intensification of SHW reaching full strength since 3000 cal. BP. Centred around 2200, 1000 cal. BP and in the 20th century, Laguna Azul experienced century-long warm/dry spells. Between these dry periods, two pronounced moist periods are suggested to be contemporaneous to the ‘Dark Age Cold Period’ and the ‘Little Ice Age’. Different from millennial SHW variations, centennial fluctuations appear to be synchronous for South America and the Northern Hemisphere. Changes in solar activity, large volcanic eruptions and/or modulations of ocean circulation are potential triggers for this synchronicity. | ||
| 650 |
_aDark Ages Cold Period (DACP), _951566 |
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| 650 |
_a Roman Climate Anomaly (RCA), _951567 |
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| 650 |
_asalinity changes, _951568 |
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| 650 |
_atephra layers, _951569 |
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| 650 |
_aXRF scanning _951570 |
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| 650 |
_a ectogenic meromixis, _951571 |
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| 650 |
_aHolocene climate change, _951572 |
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| 650 |
_a lake-level fluctuations, _951573 |
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| 650 |
_a‘Little Ice Age’ (LIA), _951574 |
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| 650 |
_aMedieval Climate Anomaly (MCA), _951575 |
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| 700 |
_aFey, Michael _951576 |
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| 700 |
_aJanssen, Stephanie _951577 |
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| 773 | 0 |
_012756 _916504 _dLondon: Sage Publication Ltd, 2019. _tHolocene/ _x09596836 |
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| 856 | _uhttps://doi.org/10.1177/0959683618816446 | ||
| 942 |
_2ddc _cART |
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| 999 |
_c12786 _d12786 |
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