|
|||||
|
|
| 大气热层结条件对林冠显热的影响 | |
| 引用本文： | 刁一伟,王安志,关德新,金昌杰,裴铁潘.大气热层结条件对林冠显热的影响[J].应用生态学报,2010,21(1):145-151. |
| 作者姓名： | 刁一伟 王安志 关德新 金昌杰 裴铁潘 |
| 作者单位： | 1. 中国科学院沈阳应用生态研究所,沈阳110016;南京信息工程大学大气物理学院,南京210044 2. 中国科学院沈阳应用生态研究所,沈阳,110016 |
| 基金项目： | 国家重点基础研究发展规划项目，中国科学院知识创新工程重要方向项目，林业公益性行业科研专项 |
| 摘 要： | 应用欧拉二阶闭合模型研究了大气热层结条件下森林冠层显热通量源汇分布和通量特征.结果表明:白天,冠层上的不稳定层结和冠层下的稳定层结是森林冠层大气层结的一种特有现象;温度廓线的变化表明林冠高度2/3处存在较强的热源;冠层内大气处于弱稳定状态时,热量继续向上输送,呈现出热通量的反梯度输送.显热通量日变化的模拟值与实测值吻合,其R2=0.9035(P0.01).在显热收支方程中添加浮力项,可提高反演模型在实际大气中的模拟精度,从而改善模型对热通量收支的模拟能力. |
| 关 键 词： | 二阶闭合模型 大气热层结条件 森林冠层 通量输送 |
Effects of atmospheric thermally stratified condition on sensible heat within forest canopy. |
|
| Institution: | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China| School of Atmospheric Physics, Nanjing University of Information Science &|Technology, Nanjing 210044, China |
| Abstract: | By using Eulerian second order closure model, this paper studied the source sink distribution and flux characteristics of sensible heat within fores t canopy under atmospheric thermally stratified condition. In the daytime, a notable feature for the atmospheric stratification of forest canopy was the unstabl e stratification above the canopy and the stable stratification under the canopy. The changes of temperature profile indicated there was a ‘hot spot’ at about 2/3 of canopy height. The counter gradient fluxes within the canopy were discoered by modeling the heat flux under weak stable atmospheric condition. Simulat ions of the diurnal variation of sensible heat flux were consistent with the measurements (R2=0.9035, P<0.01). Adding buoyancy in the sensible heat balance equation could increase the simulation accuracy of inversion model, and improve the simulation capability for heat flux balance. |
| Keywords: | second order closure model atmospheric thermally stratified condition forest canopy flux transport |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |
| 点击此处可从《应用生态学报》浏览原始摘要信息 | |
| 点击此处可从《应用生态学报》下载免费的PDF全文 | |