干旱区生态环境知识资源中心(Arid): 对流冷池对黑风暴沙尘抬升和传输影响的大涡模拟研究

Arid

	对流冷池对黑风暴沙尘抬升和传输影响的大涡模拟研究
其他题名	Large Eddy Simulation Study of Effects of Convective Cold Pools on Dust-Uplift and Transportion of Black Storm
	张君霞 1; 黄倩 1; 田文寿 1; 郭振海 2; 田红瑛 1; 吴稀稀 1
来源期刊	高原气象
ISSN	1000-0534
出版年	2018
卷号	37 期号:3 页码:850-862
中文摘要	利用西北干旱区陆-气相互作用野外观测实验加密观测期间敦煌站的温度探空廓线作为大涡模式的初始场,通过在模式中设置冷源的方法,模拟研究对流冷池中的湍流结构特征,以及冷池头部和尾部的湍流对沙尘抬升和垂直传输的影响;进一步通过改变冷源冷却率和冷源半径大小的敏感性试验,探究冷源强度和尺度变化对对流冷池内湍流结构、冷池移动速度和沙尘抬升效率等特征的影响。研究表明:(1)模式模拟的对流冷池结构特征与观测结果较为一致,冷池的头部为较大的湍流涡旋,尾部是受头部下沉气流的阻挡和风切变共同作用形成的湍流涡旋,强度和尺度较小,且距离头部越远,尾部湍流强度也越弱。(2)冷池头部涡旋引起的沙尘抬升潜势较尾部的大,冷池密度流抬升的沙尘大部分在冷池内混合,仅少部分扩散到冷池外,头部的沙尘绝对浓度约是尾部的两倍。(3)增大模式冷源冷却率和冷源尺度,冷池密度流强度增强,头部涡旋移动速度增大,产生的沙尘抬升潜势也增大,沙尘可被冷池内增强的湍流涡旋传输到较高的高度,但由于冷池与环境大气的夹卷作用也增强,冷池消散也较快。
英文摘要	Using temperature profiles observed from Dunhuang meteorological station during the intensive period of a land-atmosphere interaction field experiment over the arid region of North-west China as initial field for the Large Eddy Model (LEM),characteristics of turbulent structure of convective cold pool and effects of turbulence of the cold pool head and tail on dust uplifting and vertical transportation were investigated by setting cold source in the model.Furthermore,sensitivity tests with varying cooling rate and the size of cold source in the model center were performed to study the effects of intensity and scale of the cold source on the turbulent structure of convective cold pool,the propagation velocity of leading edge of cold pool and the dust uplifted rate,etc.The results show that:(1) The simulated structural characteristics of the convective cold pool are consistent with observations.The head of the convective cold pool is a large turbulent vortex.There is a weaker and smaller turbulence in the tail due to effects of blocking of downdraft from head’s vortex and the wind shear.Turbulence in the tail becomes weaker if it is far from the head.(2) Dust uplift potential (DUP) caused by the head vortex is much larger than that of the tail.Dust is largely trapped in the well-mixed cold-pool density current except that only a small fraction of dust diffuses outside the cold pool.The absolute concentration of dust in the head is about twice as much as that in the tail.(3) Simulated results by changing cooling rate and size of cold source in the LEM presented that intensity and moving speed of leading edge of cold-pool density current increases with increasing cooling rate and size.It leads to that more dust is uplifted from the surface and more dust is transported to the higher altitude due to the enhanced turbulence of the cold pool,but cold pool becomes less long-lived because of the stronger entrainment of the ambient air with increasing cooling rate and size.
中文关键词	黑风暴 ; 对流冷池 ; 沙尘抬升潜势(DUP) ; 大涡模拟 ; 湍流
英文关键词	Black storm convective cold pool dust uplift potential (DUP) large eddy simulation turbulence
语种	中文
国家	中国
收录类别	CSCD
WOS类目	METEOROLOGY ATMOSPHERIC SCIENCES
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:6274570
来源机构	中国科学院大气物理研究所 ; 兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/237755
作者单位	1.兰州大学大气科学学院, 半干旱气候变化教育部重点实验室, 兰州, 甘肃 730000, 中国; 2.中国科学院大气物理研究所, 大气科学和地球流体力学数值模拟国家重点实验室, 北京 100080, 中国
推荐引用方式 GB/T 7714	张君霞,黄倩,田文寿,等. 对流冷池对黑风暴沙尘抬升和传输影响的大涡模拟研究[J]. 中国科学院大气物理研究所, 兰州大学,2018,37(3):850-862.
APA	张君霞,黄倩,田文寿,郭振海,田红瑛,&吴稀稀.(2018).对流冷池对黑风暴沙尘抬升和传输影响的大涡模拟研究.高原气象,37(3),850-862.
MLA	张君霞,et al."对流冷池对黑风暴沙尘抬升和传输影响的大涡模拟研究".高原气象 37.3(2018):850-862.