A speleothem record of Holocene paleoclimate from the northern Wasatch Mountains, southeast Idaho, USA
A speleothem record of Holocene paleoclimate from the northern Wasatch Mountains, southeast Idaho, USA
复制标题
DOI：
10.1016/j.quaint.2013.03.018
复制
发表时间：
2013-10
影响因子：
2.2
通讯作者：
Zachary J. Lundeen;A. Brunelle;S. Burns;V. Polyak;Y. Asmerom
中科院分区：
文献类型：
--
作者：
Zachary J. Lundeen;A. Brunelle;S. Burns;V. Polyak;Y. Asmerom
位于北方瓦萨奇山脉的明内通卡洞穴的洞穴沉积物稳定同位素记录表明，该洞穴沉积物是一个冬季偏置的全新世古气候记录。特定季节的敏感性的记录提供了一个机会，更有力地评估长期变化的大规模太平洋遥相关模式，如ENSO和PDO，与这些遥相关模式的降水异常主要发生在冬季。季节性气候合成图的高，低积雪年在研究现场表明，冬季降水是密切相关的阿留申低压的相对强度和相关的变化，从/到更多的纬向或更多的纬向转向水平风模式。明内通卡洞穴数据表明，比现代早全新世的冬天湿/凉，和一个干燥的全新世中期一致的变暖趋势，从7400至3800 BP。4000 BP后，数据表明，在全新世晚期的大部分时间里，冬季会恢复到比现代更潮湿和/或更冷的状态。在7400 - 6000 BP和4200 BP之间确定了延长的冬季干燥期。
A speleothem stable isotope record from Minnetonka Cave, located in the northern Wasatch Mountains, is shown to be a winter season biased record of Holocene paleoclimate. The season-specific sensitivity of the record provides an opportunity to more robustly evaluate long-term variability in large-scale Pacific teleconnection patterns such as ENSO and PDO, as precipitation anomalies associated with these teleconnection patterns occur primarily in winter. Seasonal climate composite maps of high and low snowpack years at the study site demonstrate that winter precipitation is strongly linked to the relative strength of the Aleutian Low and the associated changes from/to more meridional or more zonal steering level wind patterns. Minnetonka Cave data suggest wetter/cooler than modern early Holocene winters, and a dry middle Holocene with a consistent warming trend from 7400 to 3800 BP. After ∼4000 BP, data suggest a return to wetter and/or colder than modern winters for much of the late Holocene. Prolonged winter-dry intervals are identified from 7400 to 6000 BP and ∼4200 BP.