RECONSTRUCTION OF CARIBBEAN CLIMATE CHANGE OVER THE PAST 10,500 YEARS
RECONSTRUCTION OF CARIBBEAN CLIMATE CHANGE OVER THE PAST 10,500 YEARS
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DOI：
10.1038/352790a0
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发表时间：
1991-08-29
期刊：
影响因子：
64.8
通讯作者：
DORSEY, KT
中科院分区：
文献类型：
--
作者：
HODELL, DA;CURTIS, JH;DORSEY, KT
来自低纬度湖泊的沉积物岩心为晚更新世以来的热带气候变化提供了一些最好的记录。本文报告了基于海地米拉戈纳湖介形类壳O-18/O-16比值的加勒比海气候的高分辨率重建。结果表明，新仙女木期后期（10.5 ~ 10 kyr BP）气候干燥，湖泊水位低，末次消冰期（约10 ~ 7 kyr BP）湖泊水位上升，反映了全新世早期持续近4000年的湿润环境。随着全新世晚期普遍存在的干燥气候的开始，湖泊水位在大约3.2 kyr BP下降。加勒比地区气候的这些长期变化大体上与非洲同期的气候变化相似，可以在很大程度上用轨道引起的（米兰科维奇）季节性日照变化来解释，这种变化改变了年周期的强度。叠加在轨道强迫气候趋势上的是由海洋-大气系统中复杂的非线性相互作用造成的更为突发性的气候事件。对安的列斯生物地理学的解释以及加勒比和中美洲文化的发展必须在这种气候变化的背景下加以考虑。
SEDIMENT cores from low-latitude lakes provide some of the best records of tropical climate change since the late Pleistocene. Here we report a high-resolution reconstruction of Caribbean climate based on O-18/O-16 ratios in ostracod shells from Lake Miragoane, Haiti. Our results show that the climate was dry and the lake level low during the latter part of the Younger Dryas chronozone (10.5-10 kyr BP), but that water level in the lake rose at the end of the last deglaciation (approximately 10-7 kyr BP), reflecting the wetter conditions of the early Holocene which persisted for nearly 4,000 years. Lake level declined at approximately 3.2 kyr BP with the onset of a drier climate which generally prevailed throughout the late Holocene. These long-term changes in Caribbean climate are generally similar to those found for Africa over the same period, and can be largely explained by orbitally induced (Milankovitch) variations in seasonal insolation which modified the intensity of the annual cycle. Superimposed on the orbitally forced climate trends are more abrupt climate events that result from complex, nonlinear interactions in the ocean-atmosphere system. The interpretation of Antillean biogeography and the development of Caribbean and Mesoamerican culture must be considered in the context of such shifts in climate.