Climate variability on the Yucatan Peninsula (Mexico) during the past 3500 years, and implications for Maya Cultural Evolution
Climate variability on the Yucatan Peninsula (Mexico) during the past 3500 years, and implications for Maya Cultural Evolution
复制标题
DOI：
10.1006/qres.1996.0042
复制
发表时间：
1996-07-01
影响因子：
2.3
通讯作者：
Brenner, M
中科院分区：
文献类型：
--
作者：
Curtis, JH;Hodell, DA;Brenner, M
通过对墨西哥蓬塔拉古纳湖6.3米沉积岩芯中单种介形类和腹足类三角洲(18)O的测量，重建了尤卡坦半岛过去3500年的气候变异性。根据平均增量(18)O值的变化，将该晚全新世记录划分为三个时期。从类似于3310到类似于1785C-14年B.P.(周期I)，低的平均Delta(18)O值指示相对潮湿的条件(即低蒸发/降水比，E/P)。1785年至14年间(第II期)与1785年至930C至14年间(第II期)相比，氧同位素平均值增加明显。第II期后期气候持续干燥，异常干旱事件集中在1171、1019和943 C-14a B.P.(相当于862、986和1051年)。在墨西哥和中美洲的其他几个地方也记录了这种频繁的干旱，而且恰逢古典玛雅文明的崩溃。在最后一次干旱事件之后，Delta(18)O值在类似于930C-14年B.P.(第III期开始)时突然下降，标志着恢复到目前普遍存在的更潮湿的条件，除了以559C-14年B.P.(1391年)为中心的干旱时段。蓬塔拉古纳的古气候记录提供了证据，表明尤卡坦半岛在全新世晚期发生了数十年和千年尺度的E/P变化。这些湿/干事件可能影响了中美洲的文化进化。(C)1995年华盛顿大学。
Climate variability on the Yucatan Peninsula during the past 3500 yrs is reconstructed from the measurement of delta(18)O in monospecific ostracods and gastropods in a 6.3-m sediment core from Lake Punta Laguna, Mexico. This late Holocene record is divided into three periods based on changes in mean delta(18)O values. From similar to 3310 to similar to 1785 C-14 yr B.P. (Period I), low mean delta(18)O values indicate relatively wet conditions (i.e., low evaporation to precipitation ratio, E/P). Mean oxygen isotopic values increased similar to 1785 C-14 yr B.P., and the interval between similar to 1785 and similar to 930 C-14 Yr B.P. (Period II) was distinctly drier than the periods before or after. The climate during the latter part of Period II was persistently dry, with exceptionally arid events centered at similar to 1171, 1019, and 943 C-14 Yr B.P. (equivalent to 862, 986, and 1051 A.D.). This interval of frequent drought was recorded at several other localities in Mexico and Central America, and coincided with the collapse of Classic Maya civilization. Following the last arid event, delta(18)O values decreased abruptly at similar to 930 C-14 Yr B.P. (beginning of Period III), signaling a return to wetter conditions that have generally prevailed to the present, with the exception of a dry episode centered at 559 C-14 yr B.P. (1391 A.D.). The paleoclimatic record from Punta Laguna provides evidence that multi-decadal and millennial-scale changes in E/P occurred on the Yucatan Peninsula during the late Holocene. These wet/dry episodes may have influenced cultural evolution in Mesoamerica. (C) 1995 University of Washington.