| 中亚热带森林区通量观测的源面积探讨 |
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| 引用本文： | 沈艳,刘允芬.中亚热带森林区通量观测的源面积探讨[J].植物生态学报,2005,29(2):202-207. |
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| 作者姓名： | 沈艳 刘允芬 |
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| 作者单位： | （1 南京信息工程大学气象学院,南京210044）(2 中国科学院地理科学与资源研究所, 北京100101) |
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| 基金项目： | 中国科学院知识创新工程项目，中国科学院知识创新工程项目，中国科学院知识创新工程项目 |
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| 摘 要： | 利用2002～2003年典型中亚热带森林地区(千烟洲站)通量观测资料，运行FSAM（Flux-source-area-model）解析模型初步确定该站的通量源面积。结果表明：通量源面积随测量高度、测量时间和大气稳定度变化；风向的季节变化，使得通量源面积分布方向也变化；该测站有足够大的风距，测量结果能代表仪器所在地的现场特征，即森林下垫面特征。另外，相同时间的风向和通量数据绘图表明：在Z/L满足模型运行要求时，通量数据几乎集中在一个方向上(随风向变化)。模型结果在水平均匀湍流下得到，满足模型基本要求。在该测站中，FSAM模型只能模拟昼夜层结稳定，湍流不活跃时的通量源面积。今后重点是进一步查明森林内、外湍流特点，改进模型，使之对该测站的适用性更广。
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| 关 键 词： | 通量源面积 森林 涡动相关法 莫宁-奥布霍夫长度 |
| 修稿时间： | 2004年4月19日 |
EXAMINATION OF SOURCE AREA IN-FLUX MEASUREMENTS AT THE MID-SUBTROPICAL FOREST REGION |
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| SHEN Yan,LIU Yun-Fen.EXAMINATION OF SOURCE AREA IN-FLUX MEASUREMENTS AT THE MID-SUBTROPICAL FOREST REGION[J].Acta Phytoecologica Sinica,2005,29(2):202-207. |
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| Authors: | SHEN Yan LIU Yun-Fen |
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| Affiliation: | (1 College of Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China) |
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| Abstract: | Micrometeorological measurements depend on knowing the spatial resolution of the heterogeneous surface, defined as the source area. Based on 2002-2003 flux data at the Mid-Subtropical forest area (Qianyanzhou Station), the flux source area was examined using the FSAM analytical model. Evidence suggested that the source area changed with measurement height, time and atmospheric stability, i.e., under the same conditions, a higher measurement and more stable atmospheric layer created a larger flux source area and farther minimum horizontal distance (a) away from the tower. Seasonal variation of wind direction influenced the distribution direction of the area. A higher measurement height and more stable atmospheric layer caused a stronger pertinence of d/Z 0 and S v/u *, which was independent of wind direction. Because of the big fetch, the measurements were representative of the specific characteristics of the instrument location, i.e., the surface of the underlying forest. Moreover, plotting the wind direction and flux data (including the CO 2 flux, the sensible heat flux and the latent heat flux) on a synchronous basis indicated that when the Z/L data satisfy the model requirements, the flux data almost converge at the same wind direction. The results were obtained under conditions of horizontally homogeneous turbulence, which meets the basic need of the model. In Qianyanzhou Station, the FSAM model can only simulate the flux source area under conditions of day-and-night stable atmospheric layer and inactive turbulence. Future work needs to study the turbulent characteristics within and above the forest and improve the model so that it can be applied more widely in the station. |
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| Keywords: | Flux source area Forest Eddy-covariance technique Monin-Obukhov length |
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