The Gobi Desert in southern Mongolia has been identified as the strongest dust storm hot spot threatening public health and socio-economic activities in East Asian countries. Despite its significance, the complete mapping of the aeolian surface erosion in southern Mongolia remains unresolved because of extensive region of interest cannot be interpreted easily by conventional approaches. Therefore, in this study, we built a mapping scheme to define on going aeolian erosion and applied it over the southern Gobi Desert. The remote sensing approach applied here was based on an interferometric synthetic-aperture radar (InSAR) time series technique. A number of Sentinel-1 InSAR pairs that generate phase coherences for a certain period were synthesized via the means of principle component analysis to extract the topographic persistence indicative of surface erosion rates. Validation analyses performed through inter-comparisons of phase coherence signals over landmark areas and residuals between global digital elevation models confirmed the reliability of outputs. The results revealed geological lineaments in southern Mongolia confining sandy deposits and the sediment transportation pathways. Apparently, such bounded eolian deposits and transportation mechanisms within geological structures have significantly contributed to dust generation in the Gobi Desert over southern Mongolia. In addition, this study demonstrated that the newly developed InSAR time series technique has great potential for identifying intensified land erosion and dust sources.

蒙古南部的戈壁沙漠被认为是威胁东亚国家公共卫生和社会经济活动的最强烈的沙尘暴热点。尽管具有重要意义，但由于传统方法无法轻松地解释广泛的关注区域，因此仍无法解决蒙古南部风沙表面侵蚀的完整图谱。因此，在这项研究中，我们建立了一个定义持续风蚀的制图方案，并将其应用于南部戈壁沙漠。此处采用的遥感方法基于干涉合成孔径雷达（InSAR）时间序列技术。通过主成分分析的方法，合成了许多在一定时期内产生相干性的Sentinel-1 InSAR对，以提取表明表面侵蚀速率的地形持久性。通过对界标区域上的相位相干信号和全局数字高程模型之间的残差进行相互比较而进行的验证分析证实了输出的可靠性。结果表明，蒙古南部的地质构造局限了砂质沉积物和沉积物的运输途径。显然，这种地质构造内有限的风积物和运移机制对蒙古南部戈壁沙漠的扬尘起了重要作用。此外，