| 计算非均匀地表通量的一种简化PDF及其应用 |
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| 引用本文： | 刘晶淼,王纪军,丁裕国. 计算非均匀地表通量的一种简化PDF及其应用[J]. 高原气象, 2002, 21(6): 583-590 |
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| 作者姓名： | 刘晶淼 王纪军 丁裕国 |
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| 作者单位： | 中国气象科学研究院,北京,100081;南京气象学院,江苏,南京,210044 |
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| 基金项目： | 国家重大基础研究项目 (G19980 40 911)资助 |
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| 摘 要： | 提出描述地表非均匀特性的简化概率密度函数（PDF）,它可代替各种具体的PDF用于求解次网格尺度平均通量而不影响其精度,这种简化PDF可直接加入陆面过程模式方程组中进行陆－气通量交换的数值试验。它对非均匀地表陆面过程参数化具有一定的普适性。本文仅讨论了对称分布的简化计算（非对称分布另文讨论）,列举了非均匀分布的观测事实,并以地表净红外辐射通量计算为例,详细验证了应用这种简化PDF的可行性和可靠性。
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| 关 键 词： | 陆面过程 非均匀地表 概率密度函数 空间分布 参数化 |
| 文章编号： | 1000-0534(2002)06-0583-08 |
| 修稿时间： | 2001-05-15 |
A Simplified PDF for Computing Regional Mean Flux over Heterogeneous Surface and Its Application |
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| LIU Jing|miao ,WANG Ji|jun , DING Yu|guo. A Simplified PDF for Computing Regional Mean Flux over Heterogeneous Surface and Its Application[J]. Plateau Meteorology, 2002, 21(6): 583-590 |
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| Authors: | LIU Jing|miao WANG Ji|jun DING Yu|guo |
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| Affiliation: | LIU Jing|miao 1,WANG Ji|jun 2, DING Yu|guo 2 |
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| Abstract: | A simplified probability density function (PDF) which is applied to description surface heterogeneity is presented in this paper. The PDF may be directly used in LSPM to carry out the numerical experiment of the land|air physical exchange over subgrid scale area, and the accuracy of the calculated flux is not influenced by this simplified method. Thus, the method has certain generality. But, only a symmetrical simplified PDF distribution is researched in this paper. The cases for calculations of net flux of infrared radiation over the heterogeneous land surface are virified by using the simplified PDF. |
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| Keywords: | Land surface process Heterogeneous of land surface Probability density function Spatial distribution Parameterization |
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