| 鄱阳湖地区地表通量特征及影响因素 |
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| 引用本文： | 饶志娟,刘熙明,汪如良.鄱阳湖地区地表通量特征及影响因素[J].气象与减灾研究,2021,44(1):25-33. |
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| 作者姓名： | 饶志娟 刘熙明 汪如良 |
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| 作者单位： | 江西省气象学会秘书处,江西南昌 330096;江西省气象科学研究所,江西南昌 330096;江西省气象服务中心,江西南昌 330096 |
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| 基金项目： | 2017年江西省气象局面上项目“鄱阳湖地区CO2通量及地表粗糙度特征分析” |
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| 摘 要： | 利用2013年7月1日—2014年6月30日鄱阳湖东岸70 m铁塔的涡动相关观测资料,统计分析了风、温度、通量足迹的分布,重点分析了湍流通量的变化及其影响因素,结果表明:1)鄱阳湖地区夏季主要以南风、西南偏南风和东南偏南风为主,冬季风向多变,主要以西北风、西北偏北风等偏北风为主.秋季风速较强,春季次之,夏季最小.通量足迹在南、北方向密集,在西南和东北方向稀疏.2)动量通量表现为夏、秋季较大,冬、春季较小.感热通量表现为秋季最大,春季次之,夏季最小;秋季整体的变化幅度都较大,夏季整体较小.潜热通量夏季最大,冬季最小;潜热通量夏季整体的变化幅度较大,冬季整体较小.3)随着下垫面粗糙度的增大,摩擦速度和动量通量显著增大.潜热通量与水的相变密切相关,来自湖面的潜热通量较大,而来自陆地的较小;感热通量与大气稳定度有关,在稳定状态时为负,在不稳定状态感热通量显著增大.
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| 关 键 词： | 动量通量 感热通量 潜热通量 影响因素 鄱阳湖地区 |
| 收稿时间： | 2021/1/2 0:00:00 |
| 修稿时间： | 2021/2/19 0:00:00 |
Characteristics and impact factors of surface fluxes in Poyang Lake area |
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| Rao Zhijuan,Liu Ximing and Wang Ruliang.Characteristics and impact factors of surface fluxes in Poyang Lake area[J].Meteorology and Disaster Reduction Research,2021,44(1):25-33. |
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| Authors: | Rao Zhijuan Liu Ximing and Wang Ruliang |
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| Institution: | Secretariat of Jiangxi Meteorological Society,Jiangxi Meteorological Research Institute and Jiangxi Meteorological Service Center |
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| Abstract: | Based on the eddy observation data of 70 m tower over the east bank of Poyang Lake from July 1, 2013 to June 30, 2014, the distribution of wind, temperature and flux footprints was statistically analyzed, and the variation of turbulent flux and its impact factors were emphatically analyzed. The results showed that: 1) In summer, the Poyang Lake area was dominated by southerly, south southwesterly and south southeasterly. In winter, the wind direction was changeable and dominated by northwesterly and north northwesterly. The wind speed was relatively strong in autumn, followed by spring and summer. The flux footprints were dense in the south and north, and sparse in the southwest and northeast. 2) The momentum flux was larger in summer and autumn than in winter and spring. The sensible heat flux presented the largest in autumn, followed by spring, and the minimum occurred in summer; the variation amplitude of sensible heat flux in autumn was larger than that in summer. The latent heat flux exhibited the largest in summer and the smallest in winter; the variation amplitude of latent heat flux was larger in summer than in winter. 3) With the increase of surface roughness, the friction velocity and momentum flux increased significantly. The latent heat flux was closely related to the phase transition of water, and the latent heat flux from lake was larger than that from land. The sensible heat flux was related to atmospheric stability, which was negative in stable state, and increased significantly in unstable state. |
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