Trans-pacific dust transport: integrated analysis of NASA/CALIPSO and a global aerosol transport model
Trans-pacific dust transport: integrated analysis of NASA/CALIPSO and a global aerosol transport model
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DOI：
10.5194/acp-9-3137-2009
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发表时间：
2009-05
影响因子：
6.3
通讯作者：
K. Eguchi;I. Uno;K. Yumimoto;T. Takemura;A. Shimizu;N. Sugimoto;Zhaoyan Liu
中科院分区：
文献类型：
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作者：
K. Eguchi;I. Uno;K. Yumimoto;T. Takemura;A. Shimizu;N. Sugimoto;Zhaoyan Liu
利用NASA/CALIOP垂直分辨率测量和三维气溶胶模型（SPRINTARS）研究了2007年5月5日至15日发生的跨太平洋亚洲尘埃输送的详细三维结构。CALIOP和SPRINTARS的沙尘消失在从北太平洋到北美的沙尘源区的运输过程中表现出很好的一致性。在东北太平洋和北美洲上空观测到垂直双层沙尘分布。较低的沙尘层源于5月5日在戈壁沙漠产生的沙尘暴。它在海拔约4公里的高度运输，并在运输过程中与亚洲人为空气污染物混合。上层沙尘主要来源于戈壁沙尘暴发生后2 ~ 3天塔克拉玛干沙漠的一次沙尘暴。在跨太平洋运输过程中，上层沙尘云在主要云层之上的更高高度输送。因此，它一直未与亚洲空气污染物混合，几乎不受湿法去除的影响。其浓度水平的衰减很小（在穿越太平洋的长途运输后仅衰减一半）。我们的沙尘收支分析表明，通过140°E经面的亚洲沙尘通量为2.1 Tg，其中三分之一到达北美。研究结果表明，戈壁沙漠是长距离沙尘运移的重要来源，塔克拉玛干沙漠是高海拔地区长距离沙尘运移的重要来源。
Detailed 3-D structures of Trans-Pacific Asian dust transport occurring during 5–15 May 2007 were investigated using the NASA/CALIOP vertical-resolved measurements and a three-dimensional aerosol model (SPRINTARS). Both CALIOP and SPRINTARS dust extinctions showed a good agreement along the way of the transport from the dust source regions across North Pacific into North America. A vertically two-layered dust distribution was observed over the northeastern Pacific and North America. The lower dust layer originated from a dust storm generated in the Gobi Desert on 5 May. It was transported at an altitude of around 4 km MSL and has mixed with Asian anthropogenic air pollutants during the course of transport. The upper dust layer mainly originated from a dust storm that occurred in the Taklimakan Desert 2–3 days after the Gobi dust storm generation. The upper dust cloud was transported in higher altitudes above the major clouds layer during the Trans-Pacific transport. It therefore has remained unmixed with the Asian air pollutants and almost unaffected by wet removal. The decay of its concentration level was small (only one-half after its long-distance transport crossing the Pacific). Our dust budget analysis revealed that the Asian dust flux passing through the longitude plane of 140° E was 2.1 Tg, and one third of that arrived North America. The cases analyzed in this study revealed that, while the Gobi Desert is an important source that can contribute to the long-range dust transport, the Taklimakan Desert appears to be another important source that can contribute to the dust transport occurring particularly at high altitudes.