Studies of the Relationship between the Climatic Tempera- tures and the D/H and 13C/12C Ratios in Trees, with PossibleApplications for Retrieval of the Earth's Past Climates

该奖项支持一个项目，该项目旨在建立环境温度与从树木中提取的纤维素中不可交换氢的氘/氢（D/H）比率之间的关系，这些纤维素来自各种气候条件。该项目将确定温度以外的因素在多大程度上影响氘/氢（D/H）比。其中可能包括湿度、生长历史、根系的性质及其与树木使用的水源的关系，以及纤维素中D/H比与该地区水文的关系。收集地点位于俄勒冈州、加利福尼亚州和加拿大马尼托巴省。这些因素的分辨率将允许从不同地点的许多树木中检索气候信息。氘/氢的记录目前出人意料地表明，19世纪的全球变暖速度比20世纪要快。如果全球变暖与大气中二氧化碳的增加直接相关，这与人们的预期相反。这一结果的确认对于我们理解二氧化碳在影响地球气候方面所起的作用至关重要。

This award supports a project designed to establish the relationship between environmental temperature and the Deuterium/Hydrogen (D/H) ratio in unexchangeable hydrogen in cellulose extracted from trees from locations covering a wide range of climatic conditions. The project will ascertain to what degree factors other than temperature affect the Deuterium/Hydrogen (D/H) ratio. Among these might be humidity, growth history, the nature of the root system and its relationship to the source water used by the trees, and generally the relationship between the D/H ratio in cellulose and the hydrology of the area. The collecting sites are located in Oregon, California, and Manitoba, Canada. The resolution of these factors will allow the retrieval of climatic information from many trees from different locations. The Deuterium/Hydrogen records currently indicate unexpectedly that the rate of global warming is greater in the 19th century than in the 20th century. This is contrary to what is expected if global warming were directly related to the increase in atmospheric C02. The confirmation of this result is critical to our understanding of the role that C02 plays in affecting the earth's climate.