The anatomy of long-term warming since 15 ka in New Zealand based on net glacier snowline rise
The anatomy of long-term warming since 15 ka in New Zealand based on net glacier snowline rise
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DOI：
10.1130/g34288.1
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发表时间：
2013-08-01
期刊：
影响因子：
5.8
通讯作者：
Anderson, Brian
中科院分区：
文献类型：
--
作者：
Kaplan, Michael R.;Schaefer, Joerg M.;Anderson, Brian
全球冰川后气候变化的时间和规模为我们提供了对自然气候变化潜在驱动因素的洞察力。利用冰雹地貌填图、Be-10地表暴露测年、雪线重建和数值模拟，我们量化了晚冰期(15-11.5ka)和全新世(过去类似于11.5k.Y.)的冰川行为。时间在新西兰的本奥豪山。在南极冷反转(ACR)期间，冰川比随后的冰川更广泛，在全新世期间，冰川边缘经历了一次断断续续的净撤退。与冰雹达到最佳匹配的数值模拟实验表明，ACR期间的气温比今天低1.8摄氏度到2.6摄氏度，规定降雨量类似(+/-20%)。在ACR之后，穿过较年轻的仙女座(12.9-11.7ka)的雪线净上升类似于100米，随后是另一个类似于11K.Y之间的类似100米的“长期”或净上升。和500年前差不多。新西兰的冰川雪线记录显示了大体上一致的晚冰期和全新世气候趋势。然而，西南太平洋地区的古气候记录显示出与北半球的重要差异。
The timing and magnitude of postglacial climatic changes around the globe provide insights into the underlying drivers of natural climate change. Using geomorphologic mapping of moraines, Be-10 surface-exposure dating, snowline reconstructions, and numerical modeling, we quantified glacier behavior during Late Glacial (15-11.5 ka) and Holocene (the past similar to 11.5 k.y.) time in the Ben Ohau Range, New Zealand. Glaciers were more extensive during the Antarctic Cold Reversal (ACR), than subsequently, and the margins underwent a punctuated net withdrawal over the Holocene. Numerical modeling experiments that achieve the best fit to the moraines suggest that air temperature during the ACR was between 1.8 degrees C and 2.6 degrees C cooler than today, with similar (+/- 20%) prescribed precipitation. After the ACR, a net snowline rise of similar to 100 m through the Younger Dryas stadial (12.9-11.7 ka) was succeeded by a further "long-term," or net, rise of similar to 100 m between similar to 11 k.y. and similar to 500 yr ago. Glacier snowline records in New Zealand show generally coherent Late Glacial and Holocene climate trends. However, the paleoclimate record in the southwest Pacific region shows important differences from that in the Northern Hemisphere.