Time-scale analyses of heat/water vapor/carbon dioxide transport in the lower atmosphere

低层大气中热量/水蒸气/二氧化碳传输的时间尺度分析

• 批准号: 17560450
• 负责人: ASANUMA Jun
• 金额: $ 2.46万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17560450/
• 关键词: Evapotranspiration; Surface Heat Budget; Canopy Layer; Forest Canopy; Wavelet Transform; Ecohydrology; Soil Respiration; Atmosheric Boundary Layer; CO2吸収量

This study investigates the scale-dependence, both in time and space (or frequency), of the evapotranspiration, sensible heat flux, and CO_2 uptake at the forest-atmosphere interface. In FY 2007, the last year of the project, the data obtained during an intensive observation made at Fujiyoshita experiment station of the Forestry and Forest Products Research Institute were analyzed, and the surface renewal method was applied to the data. The method formalizes surface flux using a conceptual model of heat and mass exchange between the forest canopy and the atmosphere adjacent to it. During this FY, models of the vertical length scale as a function of the stability used in the surface renewal formalization was investigated.Moreover, in order to compare with the result above the forest canopy, the scale-dependence was investigated with the data obtained over various land covers. Analyses of the data obtained over a grassland and larch forest in Mongolia revealed that the surface energy bal … More ance and the CO_2 uptake at the grassland is influenced more strongly by the amount of precipitation and the soil moisture after the rainfall than those at the forest (Li, et. Al., 2007). Analyses of turbulence data obtained at a grassland over Tibetan plateau indicates that the convective activities at the scale of the boundary layer depth affect the temperature and humidity fluctuations and deteriorate the similarity between them (equality of the eddy diffusivities, Asanuma, et. Al., 2007). Wavelet transform was applied to the data obtained over a rice paddy field in Japan, and the results show the characteristics of the heat and water vapor exchange between the atmosphere and the land surface at the scale around the gap between the turbulence and mesoscale motions (Saito, et. Al., 2007).These results were presented at some academic conferences, such as that of Japanese Society of Hydrology and Water Resources and the Society of Agricultural Meteorology of Japan (Iwata, et. Al., 2007a, 200b, Saito, et. Al. 2007a, 2007b, Asanuma, et. Al., 2007a 2007b). Less

本文研究了森林-大气界面蒸散量、感热通量和CO_2吸收量在时间和空间（或频率）上的尺度依赖性。2007年度，在该项目的最后一年，对在林业林产综合研究所藤吉下实验站进行的密集观测中获得的数据进行了分析，并对数据应用了表面更新方法。该方法使用森林冠层与邻近大气之间的热量和质量交换的概念模型来形式化地表通量。在本财年期间，研究了用于地表更新形式化的垂直长度尺度模型作为稳定性的函数。此外，为了与森林冠层以上的结果进行比较，还研究了不同土地覆盖的尺度依赖性。对在蒙古草原和落叶松林上空获得的资料进行分析表明，地表能量平衡 ...更多信息 草原吸收CO_2受降水量和雨后土壤含水量的影响比森林更大（Li，et.艾尔，2007年）。对青藏高原草原湍流资料的分析表明，边界层深度尺度上的对流活动影响着温度和湿度的脉动，并使它们之间的相似性变差（涡动扩散系数相等，Asanuma等）。艾尔2007年）。小波变换应用于日本稻田上空获得的资料，结果显示了在湍流和中尺度运动之间的差距附近尺度上大气和地表之间的热量和水汽交换的特征（Saito，et.艾尔2007).这些结果在日本水文水资源学会和日本农业气象学会的学术会议上发表（岩田等）。艾尔2007 a，200 b，Saito，et. 2007 a，2007 b，Asanuma，et.艾尔2007年a 2007年b）。少

项目成果

Low Frequency Contributions to Heat, Water Vapor and Carbon Dioxide Fluxes Measured over Boreal Forest and Rice Paddy Field in Japan

日本北方森林和稻田测得的低频对热量、水蒸气和二氧化碳通量的贡献

• 发表时间: 2005
• 期刊: Proc.International Conf.Research Highlights and Vanguad Tech.on Env.Eng.in Agricul.Systems
• 作者: M.Saito;J.Asanuma;A.Miyata
• 通讯作者: A.Miyata

昼間の森林上粗度層における顕熱フラックスのsurface renewal解析

白天森林粗糙层感热通量的表面更新分析

• 发表时间: 2007
• 作者: 岩田拓記;浅沼順;大谷義一;溝口康子;安田幸生
• 通讯作者: 安田幸生

On the contribution of very low frequency variability on the observed surface fluxes

关于极低频率变化对观测到的表面通量的贡献

• 发表时间: 2006
• 作者: Saito;M.;Asanuma;J.;Miyata;A.
• 通讯作者: A.

An overview of the rangelands atmosphere–hydrosphere–biosphere interaction study experiment in northeastern Asia (RAISE)

• DOI: 10.1016/j.jhydrol.2006.07.032
• 发表时间: 2006-12
• 期刊: Journal of Hydrology
• 影响因子: 6.4
• 作者: Michiaki Sugita;J. Asanuma;M. Tsujimura;S. Mariko;Minjiao Lu;F. Kimura;D. Azzaya;Ts. Adyasuren

Dual-scale transport of sensible heat and water vapor over a short canopy under unstable conditions

不稳定条件下短冠层显热和水蒸气的双尺度传输

• 发表时间: 2007
• 期刊: Water Resour. Res. 43
• 作者: Saito;M.;Asanuma;J.;and Miyata;A.
• 通讯作者: A.