摘要
应用盘锦芦苇生态系统观测场的涡度相关通量观测系统和小气候梯度系统的观测资料,估算了芦苇下垫面的空气动力学参数,并分析了其影响因素。结果表明:芦苇湿地零平面位移d和粗糙度Z0的季节变化总体呈现先增加后减少的单峰曲线变化规律。Z0和d均在9月达到最大,分别为0.24 m和1.85 m;12月达到最小,分别为0.03 m和0.02 m。芦苇湿地的Z0和d的季节变化主要受叶面积指数(LAI)、株高(h)及风速的影响。d随h的增加而单调增加,Z0随着h的变化遵循二次曲线,d/h、Z0/h与LAI之间的复相关系数分别为0.99和0.78。研究亦表明,大气稳定度和风向也对d和Z0有一定的影响。
Based on the data of eddy covariance tower and micrometeorological gradient observation from January to December in 2005, the fundamental aerodynamic parameters including zero-plane displacement ( d ) and rough- ness length (Z0) were estimated,and their controlling factors were analyzed in Panjin reed wetland. The results showed that d and Z0 had obvious seasonal variations. The highest values of Z0 and d appeared in September with 0.24 m and 1.85 m, and their lowest values in December with 0.03 m and 0.02 m, respectively. Their seasonal variations were related with vegetation characteristics such as leaf area index (LAI) and canopy height ( h ) as well as wind speed, d had a close linear relationship with h, and the variations of Z0 with h could be expressed by quadric curves, d/h and Zo/h were nearly correlated with LAI, and multiple correlation coefficient could be 0.99 and 0.78, respectively. Moreover, the atmospheric stability and wind direction would also affect the aerodynamic parameters.
出处
《气象与环境学报》
2007年第4期7-12,共6页
Journal of Meteorology and Environment
基金
中国气象局科技项目"我国中高纬地区典型下垫面陆-气通量观测系统建设"
"东北地区干旱化和生态系统相互作用的观测与模拟"
国家杰出青年科学基金(40625015)共同资助
关键词
盘锦湿地
芦苇生态系统
空气动力学参数
零平面位移
粗糙度
叶面积指数
影响因素
Wetland in Panjin
Reed ecosystem
aerodynamic parameter
Zero-plane displacement
Roughness length
Leaf area index (LAI)
Controlling factor