Using Natural Variation in Isotopic Composition of Forest C02 to Study Ecosystem-Atmosphere Carbon Exchange

该项目的目的是发展双曲松弛涡旋积累技术，用于测量二氧化碳（CO2）同位素体（如13CO2和c1800）的生物圈-大气交换。如果这些测量能够成功进行，它们可以用于将净生态系统二氧化碳交换（NEE）划分为光合作用和呼吸作用两部分，并对这些相反过程对环境强迫的响应进行独立检查。该项目将侧重于初步的实地可行性分析。测量将在科罗拉多州Niwot Ridge的针叶林和阿尔伯塔省Lethbridge的草地上进行。本项目由地球与大气科学部和分子与细胞生物学部通过环境地球化学和生物地球化学项目（EGB）联合支持。

The objective of this project is to develop the hyperbolic relaxed eddy accumulation technique for measurements of biosphere-atmosphere exchange of isotopomers of carbon dioxide (CO2), such as 13CO2 and C18OO. If these measurements can be carried out successfully, they can be used to partition net ecosystem CO2 exchange (NEE) into the photosynthetic and respiratory components and an independent examination of the response of these opposing processes to environmental forcings. The project will focus on an initial field feasibility analysis. Measurements will be made at a coniferous forest at Niwot Ridge, Colorado, and a grassland site in Lethbridge, Alberta.This project is supported jointly by the Divisions of Earth and Atmospheric Sciences and the Division of Molecular and Cellular Biology through the Environmental Geochemistry and Biogeochemistry Program (EGB).