高原气象

高原气象 >

2018 , Vol. 37 >Issue 3: 614 - 625

DOI: https://doi.org/10.7522/j.issn.1000-0534.2017.00063

论文

太阳辐射和水汽压差对黄河源区高寒湿地潜热通量的影响研究

  • 谢琰 ,
  • 文军 ,
  • 刘蓉 ,
  • 王欣 ,
  • 贾东于
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  • 中国科学院西北生态环境资源研究院/中国科学院寒旱区陆面过程与气候变化重点实验室, 甘肃 兰州 730000;中国科学院大学, 北京 100049;成都信息工程大学大气科学学院/高原大气与环境四川省重点实验室, 四川 成都 610225

收稿日期: 2017-03-29

  网络出版日期: 2018-06-28

基金资助

国家自然科学基金项目（41530529，41375022，91737103）

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The Role of Solar Radiation and Water Vapor Pressure Deficit on Controlling Latent Heat Flux Density over the Alpine Wetland of the Source Region of the Yellow River

  • XIE Yan ,
  • WEN Jun ,
  • LIU Rong ,
  • WANG Xin ,
  • JIA Dongyu
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  • Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;University of Chinese Academy of Sciences, Beijing 100049, China;College of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, Sichuan, China; Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu 610225, Sichuan, China

Received date: 2017-03-29

  Online published: 2018-06-28

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摘要

利用2014年6月1日至8月31日中国科学院麻多黄河源气候与环境综合观测站（下称麻多站）陆面过程观测试验资料，将大气和地表因素之和作为环境因子探讨其对潜热通量的影响，分析了太阳辐射和水汽压差对黄河源区高寒湿地下垫面潜热通量的影响，并对其进行了定量化评估（即控制参量）。结果表明：（1）太阳辐射和水汽压差对潜热通量的相对大气因素控制平均为0.98和0.02，即太阳辐射是影响潜热通量的相对大气因素控制的主要因子，水汽压差的影响可忽略。（2）太阳辐射和水汽压差对潜热通量的相对地表因素控制平均为0.12和-0.31，前者早晚大，中午小，后者绝对值早晚小，中午大。（3）太阳辐射对潜热通量的绝对总控制平均为0.22，相对总控制平均为1.10。水汽压差的绝对总控制平均为-0.06 W·m-2·Pa-1，相对总控制平均为-0.29。（4）太阳辐射主要是通过直接作用（大气因素）影响潜热通量；而水汽压差则主要通过改变湿地地表阻抗的间接作用（地表因素）影响潜热通量。（5）高寒湿地下垫面地-气退耦因子（Ω）平均为0.38，表明高寒湿地与大气间的耦合程度较差，实际情况亦是如此，太阳辐射是影响高寒湿地下垫面潜热通量的主要因子。本研究为气候变化背景下的潜热通量参数化及其蒸散发研究开辟一条新的研究思路。

关键词： 高寒湿地; 黄河源区; 潜热通量; 太阳辐射; 水汽压差

本文引用格式

谢琰 , 文军 , 刘蓉 , 王欣 , 贾东于 . 太阳辐射和水汽压差对黄河源区高寒湿地潜热通量的影响研究[J]. 高原气象, 2018 , 37(3) : 614 -625 . DOI: 10.7522/j.issn.1000-0534.2017.00063

Abstract

As the alpine wetland underlying surface is moist and sensitive to climate change, quantitative assessments of environmental factors on the influence of latent heat flux over there have important scientific significance. Environmental factors on the influence of latent heat flux are potential to be expressed as sums of the atmosphere and surface factors. By using the datasets collected from the land surface process field experiment which was conducted in the source region of the Yellow River from June 1 to August 31, 2014, the characteristics of solar radiation and water vapour pressure deficit in controlling latent heat flux density were analyzed, and further assessment was evaluated by a defined controlling factor. The main results are as follows:(1) The average values of relative atmospheric controlling factors on latent heat flux density exercised by solar radiation and water vapour pressure deficit are 0.98 and 0.02. Relative atmospheric controlling factor on latent heat flux density is mainly exercised by solar radiation, and the role of water vapour pressure deficit is only marginal. (2) The average values of relative surface controlling factor over latent heat flux density exercised by solar radiation and water vapour pressure deficit are 0.12 and -0.31. The former is larger in the morning and evening, and smaller in the noon. The absolute value of the latter is smaller in the morning and evening, and larger in the noon. (3) The average values of absolute total controlling over the latent heat flux density exercised by solar radiation and water vapour pressure deficit are 0.22 and -0.06 W·m-2·Pa-1. The average values of relative total control are 1.10 and -0.29. (4) Solar radiation controls the latent heat flux mainly through a direct effect (atmospheric factor). While the water vapour pressure deficit controls latent heat flux mainly through the indirect effect of altering surface resistance (surface factor). (5) The average value of the decoupling factor over the alpine wetland is 0.38. It implied that the coupling between the alpine wetland and atmospheric is low. It is of practical, the solar radiation is the main factor to control the latent heat flux over alpine wetland. This study provides a new research approach for the study of the parameterization of latent heat flux and evaporation under the context of global climate change.

Key words： Alpine wetland; source region of the; latent heat flux; sun radiation; water vapour pressur

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