| 黄土高原地表能量闭合特征及土壤通量参数化 |
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| 引用本文： | 岳平,张强,赵文,成华,李宏宇,王若安,张建忠.黄土高原地表能量闭合特征及土壤通量参数化[J].冰川冻土,2012,34(3):583-590. |
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| 作者姓名： | 岳平 张强 赵文 成华 李宏宇 王若安 张建忠 |
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| 作者单位： | 1. 中国气象局 兰州干旱气象研究所, 甘肃省干旱气候变化与减灾重点实验室, 中国气象局干旱气候变化与减灾重点开放实验室, 甘肃 兰州 730020;2. 张掖国家气候观象台, 甘肃 张掖 734000 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)项目，国家自然科学基金项目，公益行业专项(气象)，中国博士后基金项目，中国气象局干旱气象科研基金项目 |
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| 摘 要： | 利用兰州大学半干旱气候与环境观测站(简称SACOL站)2008年夏季晴天的湍流、 辐射、 土壤温度和通量梯度观测资料, 确定了晴天土壤热参数, 并结合土壤热流量板测量的温度积分法把实际测量通量推算到地表; 讨论了典型黄土高原沟壑区土壤热量储存对地表能量闭合率的影响; 建立了计算地表土壤热通量的模型. 结果表明: 黄土高原典型沟壑区夏季晴天平均土壤热容量为1.23×106 J5m-35K-1; 能量平衡方程中, 以5 cm 埋深处HFP01SC热流量板观测值 (G5) 表示土壤热通量时, SACOL站地表能量闭合率为75.7%. 采用温度积分法, 将HFP01SC的直接测量结果校正到地表(Gs)后, 地表能量闭合率可以达到81.8%; 0~5 cm土壤层的热量储存对能量平衡的贡献为6.1%. 模型计算得土壤热通量(Gm)与Gs之间的线性回归斜率为0.973(显著性水平为0.1‰). (H+LE)与(Rn-Gm)进行线性回归, 得到地表能量闭合率为81.7%. 表明模型与温度积分法计算计算土壤热通量非常接近, 但通过参数化方法计算时仅需要知道Rn即可.
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| 关 键 词： | SACOL 黄土高原 湍流通量 土壤热参数 能量闭合率 |
| 收稿时间： | 2011-11-17 |
| 修稿时间： | 2012-02-21 |
Surface Energy-Balance Closure Features and Parameterization of Soil Heat Flux on the Loess Plateau |
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| YUE Ping,ZHANG Qiang,ZHAO Wen,CHENG Hua,LI Hong-yu,WANG Ruo-an,ZHANG Jian-zhong.Surface Energy-Balance Closure Features and Parameterization of Soil Heat Flux on the Loess Plateau[J].Journal of Glaciology and Geocryology,2012,34(3):583-590. |
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| Authors: | YUE Ping ZHANG Qiang ZHAO Wen CHENG Hua LI Hong-yu WANG Ruo-an ZHANG Jian-zhong |
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| Institution: | 1. Key Laboratory of Arid Climate Change and Reducing Deserter of Gansu Province, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou Gansu 730020, China;2. Zhangye National Climatological Observatory, Zhangye Gansu 734000, China |
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| Abstract: | Based on the radiation,turbulence flux,soil temperature and soil heat flux data observed at the Semi-Arid Climate and Environment Observatory of Lanzhou University(SACOL) in a period of 6 consecutive fine days in the summer,2008,the soil thermal parameters at different depths on the Loess Plateau in the middle of Gansu province were determined;the ground heat fluxes were calculated by using the calorimetric method,which involves measurement by a HFP01SC self-calibrating heat flux plate buried at 5-cm depth and heat storage between the plate and the surface;a simple function between net radiation and surface ground heat fluxes were derived;and the influence of the ground heat flux on the surface energy budget in the semi-arid grassland ecosystem over the Loess Plateau was studied.The results show that: 1) The mean thermal capacity is 1.23×106 J·m-3·k-1 in a gully area at SACOL;2) The surface energy closure rate is 75.7% for the typical Loess Plateau when use G5 in the surface energy budget equation,but calorimetric method can improve the surface energy budget closure to 81.8%.The contribution of the heat storage between the heat flux plates buried at 5-cm and the surface to energy budget is 6.1% in the semi-arid grassland ecosystem at SACOL;3) A model relating net radiation(Rn) and the surface heat fluxes(Gs) is developed,from which a gradient of fitted line is 0.973(the significant level is 0.1‰).Under the condition of the 0.1‰ level of significance,the gradient of the linear regression between(H+LE) and(Rn-Gm) is 0.817(i.e.the surface energy closure rate was 81.7%).One can see that the modeled heat flux is closed to the heat flux calculated with calorimetric method.Calculation with the model only inputs a parameter,Rn. |
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| Keywords: | Semi-Arid Climate and Environment Observatory of Lanzhou University(SACOL) Loess Plateau turbulence fluxes soli thermal parameters surface energy-balance closure |
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