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冻土和积雪对青藏高原湿地下垫面总体输送系数和地表粗糙度的影响
张海宏
(青海省气象科学研究所)
Influence of Soil Freezing and Snow on Bulk Transfer Coefficients and Surface Roughness at Alpine Wetland of Tibetan Plateau
ZHANG Haihong
(Qinghai Institute of Meteorological Science)
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投稿时间:2018-07-05    修订日期:2019-05-17
中文摘要: 利用玉树隆宝湿地的观测资料,分析了未冻结、冻结和冻结有积雪覆盖三种情况下动量通量和感热通量的日变化情况,计算了三种情况下动量总体输送系数、感热总体输送系数、动力学粗糙度和热力学粗糙度,分析了附加阻尼和粗糙度雷诺数的关系,并将3种附加阻尼的参数化方案进行了比较,结果表明:冻结状态下动量通量和感热通量的日变化幅度最大,冻结有积雪覆盖时,动量通量和感热通量的日变化幅度最小。动量总体输送系数CD和感热总体输送系数CH的值在冻结时最大,冻结有积雪覆盖时最小,动力学粗糙度和热力学粗糙度在冻结状况下最小,冻结有积雪覆盖时最大。未冻结、冻结和冻结有积雪覆盖状态下,3种附加阻尼kB-1参数化方案中,幂函数型方案较为合适。
Abstract:Using observed data at Longbao, Yushu, during unfrozen, frozen, frozen and snow covered periods, daily variations of momentum flux and sensible heat flux were analyzed, momentum bulk transfer coefficient, sensible heat bulk transfer coefficient, aerodynamic roughness length, thermal roughness length were calculated, relationship between additional damping and roughness reynolds number were analyzed and 3 kB-1 parameterization schemes were compared. The results show that daily range of momentum flux and sensible heat flux are biggest in frozen period and smallest in frozen and snow covered period. Momentum bulk transfer coefficient CD and sensible heat bulk transfer coefficient CH are biggest in frozen period and smallest in frozen and snow covered period. Aerodynamic roughness length and thermal roughness length are smallest in frozen period and biggest in frozen and snow covered period. Power function type of 3 kB-1 parameterization schemes is the most suitable during unfrozen, frozen, frozen and snow covered periods.
文章编号:201807050296     中图分类号:    文献标志码:
基金项目:国家自然科学基金(41065007),公益性行业(气象)科研专项(GYHY(QX)201506001)
引用文本:
张海宏,0.[en_title][J].Meteor Mon,():-.
ZHANG Haihong,0.Influence of Soil Freezing and Snow on Bulk Transfer Coefficients and Surface Roughness at Alpine Wetland of Tibetan Plateau[J].Meteor Mon,():-.