The Role of the Tropics in Quaternary Climate Change

这项拟议的研究涉及从数据稀少的亚南极地区(包括塔斯马尼亚、新西兰和南美洲南部)生成高分辨率、精确日期的树轮年表。这些记录对于建立一个可与北半球已有的古气候数据相媲美的南半球古气候数据网络至关重要。支持者正在利用亚南极年表对南半球温带外纬度的温度和大气-海洋环流指数进行建模和重建。具体目标包括：(1)编制更多的年轮宽度和最大晚材密度年表，以改进我们现有的亚南极森林地点网络；(2)利用活的和亚化石木材材料，将选定的年轮记录和重建延长到更早的时间；(3)继续模拟和重建亚南极纬度的温度、降水和环流指数；(4)编制其他几种树种的年表。

This proposed research involves the generation of high-resolution, precisely-dated tree-ring chronologies from data-sparse subantarctic regions, including Tasmania, New Zealand and southern South America. Such records are essential for developing a network of Southern Hemisphere paleoclimatic data comparable to that which already exists for the Northern Hemisphere. The proponents are utilizing the subantarctic chronologies in modeling and reconstruction of indices of temperature and atmosphere-ocean circulation for the Southern Hemisphere extratropical latitudes. Specific objectives include: (1) to develop additional ring-width and maximum latewood density chronologies to improve our existing network for subantarctic forest sites; (2) to extend selected tree-ring records and reconstructions further back in time using living and subfossil wood material; (3) to continue to model and reconstruct temperature, precipitation and circulation indices for subantarctic latitudes; and (4) to produce chronologies from several additional tree species.