大气、水与土壤
白建辉,BradBaker.内蒙古草原典型草地异戊二烯的排放特征[J].环境科学学报,2005,25(3):285-292
内蒙古草原典型草地异戊二烯的排放特征
- Emission characteristics of isoprene at typical grassland in the Inner Mongolia grassland
- 基金项目：国家自然科学基金资助项目(批准号:40175031);美国国家自然科学基金资助项目(0131785)
- 作者
- 单位
- 白建辉
- 中国科学院大气物理研究所中层大气与全球环境探测开放实验室, 北京 100029
- BradBaker
- California State University, CA 95819
- 摘要：为准确了解内蒙古草原典型草地异戊二烯的排放状况,在2002和2003年观测实验的基础上,利用已有的经验模式和观测资料,计算了羊草样地2002和2003年生长季节异戊二烯的排放通量.结果表明:2002和2003年异戊二烯排放具有明显的日、逐日、月、年变化,其排放通量首先依赖于可见光辐射,其次是温度.2002和2003年生长季羊草样地异戊二烯总排放(以C计)分别为1.10,1.00g·m-2,2003年比2002年减少9.0%.此现象主要是由于2003年可见光辐射减弱和气温降低造成的.2002和2003年生长季排放通量的最大值(以C计)分别为2332.0和1933.8μg·m-2·h-1,当可见光辐射小时累计值小于0.4MJ·m-2时,异戊二烯的排放通量一般为零.
- Abstract：For understanding the emission status of isoprene at typical grassland, the emission fluxes of isoprene at an aneurolepidium chinese sample plot (ACSP) in the Inner Mongolia grassland during 2002 and 2003 growing seasons were calculated on the basis of measurements in 2002 and 2003 and an empirical model. Isoprene emission showed an obvious diurnal, daily, monthly, yearly variation, and was dependant on solar visible radiation and air temperature. The total emission of isoprene at ACSP during 2002 and 2003 growing seasons were 1.10、1.00 g·m-2, respectively (calculated by Carbon). The decrease of isoprene emission by (9.0%) in 2003 was caused by the decrease of solar visible radiation and air temperature. The maximum of emission fluxes during 2002 and 2003 growing season were 2332.0 and 1933.8 μg·m-2·h-1, respectively (calculated by Carbon). There was basically no emission flux of isoprene, when the solar visible radiation below 0.4 MJ·m-2.
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