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| Understanding the Influences of Seasonality and Land-Use History on Biosphere-Atmosphere 13CO2 Exchange | |
| 项目编号 | DE-FG03-00ER63012 |
| Ehleringer, James | |
| 项目主持机构 | University of Utah |
| 开始日期 | 2000-09-15 |
| 结束日期 | 2003-09-14 |
| 英文摘要 | Project Research Results Final Report 1999 Progress Report 1998 Progress Report 23 publications for this project 5 journal articles for this project Related Information Research Grants P3: Student Design Competition Research Fellowships Small Business Innovation Research (SBIR) Grantee Research Project Results Search Real-Time Monitoring of Individual Atmospheric Aerosol Particles: Establishing Correlations Between Particle Size and Chemical Speciation EPA Grant Number: R826240 Title: Real-Time Monitoring of Individual Atmospheric Aerosol Particles: Establishing Correlations Between Particle Size and Chemical Speciation Investigators: Prather, Kimberly A. Institution:University of California - Riverside EPA Project Officer: Hahn, Intaek Project Period: February 1, 1998 through January 31, 2001 Project Amount: $547,000 RFA: Ambient Air Quality (1997)RFA Text | Recipients Lists Research Category:Air Quality and Air Toxics ,Air Description: Information on real-time variations of atmospheric aerosols is essential to developing appropriate control strategies and designing relevant health effect studies for particulates. Information from previous aerosol studies is limited by the long sampling times inherently required for off-line chemical analysis. The goal of the proposed research is to monitor changes in the particle size and chemical speciation of individual atmospheric aerosol particles over relatively short time intervals. Correlations will be established between fluctuations in aerosol particle size/composition distributions, gas phase measurements (i.e. NOx, ozone, NH3, HNO3), and meteorological conditions (wind speed, direction, relative humidity, temperature).The proposed studies will involve using a unique aerosol analysis method developed in our laboratory, aerosol time-of-flight mass spectrometry (ATOFMS), to monitor real-time variations in the size and chemical composition of individual aerosol particles. ATOFMS is currently the only real-time analysis method capable of providing precise aerodynamic size (+/- 1%) and correlated chemical composition information on polydisperse aerosol samples. Standard commercial gas phase measurement equipment and a weather station will be used for simultaneously measuring ozone and NOx concentrations and meteorological conditions. Denuder sampling and wet chemical analysis methods will be used for the analysis of various gas phase species.Recently, we demonstrated how ATOFMS can be used to obtain compositionally-resolved particle size distributions for atmospheric aerosols. The goal of the proposed research will be to establish how such distributions evolve over time for particles in the fine and coarse size modes (0.1-10 microns). Depending on atmospheric particle concentrations, between 2 and 10 particles per second can be analyzed using ATOFMS, thus providing representative real-time "snap-shots" of atmospheric aerosol size and chemical speciation over time intervals of several minutes. Using these real-time measurement capabilities, we will characterize temporal and spatial variations of atmospheric aerosol particles. These variations will be correlated with gas phase species concentrations, time of day, and meteorological conditions, leading to the first data detailing temporal variations in the size and chemical speciation of individual atmospheric aerosol particles. |
| 英文关键词 | ambient air;atmosphere;environmental chemistry;analytical;measurement methods;pollution;aerosol;source allocation;real-time;chemical analysis. |
| 学科分类 | 09 - 环境科学;06 - 生物科学 |
| 资助机构 | US-DOE |
| 项目经费 | 650002 |
| 项目类型 | Grant |
| 国家 | US |
| 语种 | 英语 |
| 文献类型 | 项目 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/77054 |
| 推荐引用方式 GB/T 7714 | Ehleringer, James.Understanding the Influences of Seasonality and Land-Use History on Biosphere-Atmosphere 13CO2 Exchange.2000. |
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