Palaeoecological constraints on late Glacial and Holocene ice retreat in the Southern Andes (53°S)     

Rolf Kilian  Christoph Schneider  Johannes Koch  Martinus Fesq-Martin  Harald Biester  Gino Casassa  Marcelo Arvalo  Gert Wendt  Oscar Baeza  Jan Behrmann 《Global and Planetary Change》2007,59(1-4):49

Late Glacial to Holocene ice retreat was investigated along a 120 km long fjord system, reaching from Gran Campo Nevado (GCN) to Seno Skyring in the southernmost Andes (53°S). The aim was to improve the knowledge on regional and global control on glacier recession with special emphasis on latitudinal shifting of the westerlies. The timing of ice retreat was derived from peat and sediment cores, using mineralogical and chemical characteristics, and pollen as proxies. Stratigraphy was based on ¹⁴C-AMS ages and tephrochronology. The ice retreat of the Seno Skyring Glacier lobe is marked by an ice rafted debris layer which was formed around 18,300 to 17,500 cal. yr B.P. Subsequently, fast glacier retreat occurred until around 15,000 to 14,000 cal. yr B.P. during which around 84% of Skyring Glacier were lost. This fast recession was probably also triggered by an increase of the Equilibrium Line Altitude (ELA) from 200 to 300 m. Subsequently, the ice surface was lowered below the ELA in an area that previously made up more than 50% of the accumulation area. Much slower retreat and glacier fluctuations of limited extent in the fjord channel system northeast of GCN occurred between around 14,000 to 11,000 cal. yr B.P. during both the Antarctic Cold Reversal and the Younger Dryas. This slow down of retreat indicates a decline in the general warming trend and/or increased precipitation, due to a southward migration of the westerlies. After around 11,000 cal. yr B.P. pollen distribution shows evolved Magellanic Rainforest and similar climate as at present, which lasted throughout most of the Holocene. Only Late Neoglacial moraine systems were formed in the period 1220–1460 AD, and subsequently in the 1620s AD, and between 1870 and 1910 AD. The results indicate that the Gran Campo Nevado ice cap has reacted more sensitive and partly distinct to climate change, compared to the Patagonian Ice Field.  相似文献   

北部湾全新世气候与古生态环境演进特征及其驱动因素     

黄向青  崔振昂  林海  夏真  张顺枝 《地球学报》2022,43(2):129-143

北部湾地处南海西北端, 区域广布硅酸盐和石灰岩类, 迄今对其全新世气候、古生态环境演进过程及其背景驱动因素等还有待加强了解.为此, 在北部湾南部海盆钻取了全新统岩芯, 进行了孢粉、粒度、δ18O(氧同位素)等鉴定分析以及 14C测年等.分析显示, 孢粉化石主要属种有木本松属、栲属等, 蕨类为水龙骨科、鳞盖蕨属, 6.0...  相似文献