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Detailed 3-D structures of Trans-Pacific Asian dust transport occurringduring 5–15 May 2007 were investigated using the NASA/CALIOPvertical-resolved measurements and a three-dimensional aerosol model(SPRINTARS). Both CALIOP and SPRINTARS dust extinctions showed a goodagreement along the way of the transport from the dust source regions acrossNorth Pacific into North America. A vertically two-layered dust distributionwas observed over the northeastern Pacific and North America. The lower dustlayer originated from a dust storm generated in the Gobi Desert on 5 May. Itwas transported at an altitude of around 4 km MSL and has mixed with Asiananthropogenic air pollutants during the course of transport. The upper dustlayer mainly originated from a dust storm that occurred in the TaklimakanDesert 2–3 days after the Gobi dust storm generation. The upper dust cloudwas transported in higher altitudes above the major clouds layer during theTrans-Pacific transport. It therefore has remained unmixed with the Asianair pollutants and almost unaffected by wet removal. The decay of itsconcentration level was small (only one-half after its long-distancetransport crossing the Pacific). Our dust budget analysis revealed that theAsian 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 thisstudy revealed that, while the Gobi Desert is an important source that cancontribute to the long-range dust transport, the Taklimakan Desert appearsto be another important source that can contribute to the dust transportoccurring particularly at high altitudes

Trans-pacific dust transport: integrated analysis of NASA/CALIPSO and a global aerosol transport model