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首页> 外文会议>Geoscience and Remote Sensing Symposium, 2002. IGARSS '02. 2002 IEEE International >Mechanism for Asian dust transport during blocking episode days in east Asia and North America in spring 2001
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Mechanism for Asian dust transport during blocking episode days in east Asia and North America in spring 2001

机译：2001年春季，亚洲在东亚和北美的阻塞日发生尘埃运输的机制

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The mechanism for transport of Asian dust during blocking episode days in spring 2001 has been analyzed using the TOMS aerosol index and meteorological parameters from the Meteorological Mesoscale Model 5 (MM5) with NCEP/CDAS input data. The blocking episode days are associated with the development of the upper cut-off low and surface cyclones through the E vector, an extension of the Eliassen-Palm flux. Concurrently, the occurrence of dust storms is determined by strong cold advection at the rear of the jet streak that shows a maximum wind speed within the upper jet stream. The mechanism for transport of Asian dust from China is advection of isentropic potential vorticity (IPV) on isentropic surfaces associated with tropopause folding. The transport of Asian dust during blocking episode days occurs at altitudes associated with the distribution of isentropes below the IPV boundary (for which IPV /spl ap/ 1PVU). At the same time, lee waves propagated by topography affect the downward motion and blocking of Asian dust in China. Asian dust transported from dust source regions is deposited by fallout and rain-out with a reinforcing frontogenesis within surface cyclones as seen in TOMS and GMS5 satellite images. Longrange transport of Asian dust towards North America is related to the high-latitude distribution of the jet streak determined by the upper level trough/the deepening cut-off low. In April 2001, the jet streak passed through source regions of dust storms in north and west China during a blocking episode, causing Asian dust to move horizontally eastward with the long-wave trough at 500 hPa to North America.
机译：使用TOMS气溶胶指数和来自气象中尺度模型5（MM5）的气象参数和NCEP / CDAS输入数据，分析了2001年春季阻塞事件期间亚洲扬尘的输送机制。阻塞事件的发生与通过E向量（Eliassen-Palm通量的延伸）的上切低和旋风的发展有关。同时，沙尘暴的发生是由喷流条纹后部的强冷平流决定的，该平流在上部喷流中显示出最大风速。亚洲粉尘从中国运出的机制是与对流层顶折叠相关的等熵表面上的等熵势涡（IPV）对流。在阻塞情节期间，亚洲尘埃的运输发生在与等熵线分布在IPV边界（IPV / spl ap / 1PVU）以下的高度相关的高度。同时，由地形传播的回风波影响了中国亚洲尘埃的向下运动和阻塞。从尘埃源区域输送来的亚洲尘埃通过沉降和降雨而沉积，表面气旋内的前锋增强，如TOMS和GMS5卫星图像所示。亚洲粉尘向北美的远距离运输与喷射条纹的高纬度分布有关，该条纹由高空波谷/加深的截止低点确定。 2001年4月，在一次阻塞事件中，喷流条纹穿过了中国北部和西部的沙尘暴源区域，导致亚洲沙尘以500 hPa的长波谷水平向东移动到北美。

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