Quaternary History of Vegetation and Climate of Hawaii

夏威夷第四纪植被和气候史

• 批准号: 9206044
• 负责人: Margaret Davis
• 金额: $ 27.01万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-07-15 至 1996-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9206044&HistoricalAwards=false
• 关键词: Quaternary; History; Vegetation; Climate; Hawaii

Paleoecological research in the Hawaiian Islands will provide new information about whether systems of the tropical Pacific Ocean before, during and since the last glacial maximum, perhaps leading to a better understanding of the discrepancy between continental and marine temperature records. Changes in past vegetation will be determined from fossil pollen, wood and charcoal in peat bogs and in soils buried beneath lava flows. Statistical methods of interpretation will be developed, relating modern pollen assemblages and plant distributions to the extensive data base on modern climates on the Islands. Four peat bogs have been located, at elevations varying from 500 m to 1400 m above sea level, with records extending from the present back to the last glacial maximum, and two of the bogs have bottom dates 36,000 and 41,000 years. Samples are already available from over 100 buried charcoal deposits. The locations of fossil sites along an elevational transect and rainfall gradient controlled by the trade winds means they can provide information about past lapse rates, the strength of the trade winds and the elevation of the trade wind inversion.

夏威夷群岛的古生态学研究将提供有关热带太平洋系统在末次盛冰期之前、期间和之后是否存在的新信息，或许有助于更好地了解大陆和海洋温度记录之间的差异。 过去植被的变化将通过泥炭沼泽和熔岩流下埋藏的土壤中的化石花粉、木材和木炭来确定。 将开发统计解释方法，将现代花粉组合和植物分布与岛屿现代气候的广泛数据库联系起来。 已发现四个泥炭沼泽，海拔从 500 m 到 1400 m 不等，记录可追溯到末次盛冰期，其中两个沼泽的底部日期为 36,000 和 41,000 年。 100 多个埋藏的木炭矿床已经提供了样品。 化石地点沿高程断面的位置和受信风控制的降雨梯度意味着它们可以提供有关过去的递减率、信风强度和信风逆温高度的信息。