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Low Dust Generation Potential From Active Sand Grains by Wind Abrasion
Journal of Geophysical Research: Earth Surface ( IF 3.5 ) Pub Date : 2020-07-04 , DOI: 10.1029/2020jf005545
N. Swet 1 , J. F. Kok 2 , Y. Huang 2 , H. Yizhaq 3 , I. Katra 1
Affiliation  

Wind‐driven dust emission has a major impact on many environmental and socioeconomic issues such as climate change, soil loss, biogeochemical cycles, and air pollution. It is generally assumed that the main global dust sources consist of nonsandy soils with high percentages of fine‐sized clay and silt particles. However, in recent years, it has been hypothesized that active sand bodies can generate significant dust emissions through the mechanism of sand abrasion. Moreover, sand abrasion has been used to explain the formation of certain soils on Earth and Mars. Here, we test the hypothesis that sand abrasion can generate substantial dust emissions by performing targeted wind tunnel experiments on sand grains in the absence of clay and silt particles. We find only minor emissions of particulate matter from noncoated active sands under wind conditions typical of natural sand transport. The findings suggest that the dust generated by the mechanism of sand abrasion is less than dust generated by the removal of clay minerals coated on sand grain surfaces; both mechanisms on active sands produce far less dust than nonsandy soils. Feldspar sand was found to be slightly more effective at generating dust through abrasion than quartz sand. However, due to the low spatial coverage of feldspar sands in active sands worldwide, dust generated from feldspar abrasion may produce a relatively small contribution to global dust emissions. We thus conclude that sand abrasion by wind transport has a low potential to generate dust‐sized particles from active sands.

中文翻译:

主动砂粒因风磨产生的粉尘产生潜力低

风尘排放对许多环境和社会经济问题产生重大影响,例如气候变化,土壤流失,生物地球化学循环和空气污染。一般认为,全球主要尘埃来源是非沙土,其中高比例的细粒粘土和淤泥颗粒。然而,近年来,据推测,活性砂体可通过砂磨的机理产生大量的粉尘排放。此外,砂磨被用来解释地球和火星上某些土壤的形成。在这里,我们通过在没有粘土和淤泥颗粒的情况下对沙粒进行有针对性的风洞实验来检验沙粒磨损会产生大量粉尘排放的假设。我们发现,在自然沙粒运输典型的风况下,未覆盖的活性沙粒仅排放少量颗粒物质。研究结果表明,沙粒磨损机理产生的粉尘少于砂粒表面覆盖的粘土矿物的去除所产生的粉尘。活性砂的两种机理产生的尘埃远少于非沙质土壤。发现长石砂通过磨蚀产生的粉尘比石英砂更有效。然而,由于全球活性砂中长石砂的空间覆盖率低,长石磨蚀产生的粉尘可能对全球粉尘排放产生相对较小的贡献。因此,我们得出的结论是,由于风沙磨损导致从活动沙子中产生灰尘大小的颗粒的可能性很小。研究结果表明,沙粒磨损机理产生的粉尘少于砂粒表面覆盖的粘土矿物的去除所产生的粉尘。活性砂的两种机理产生的尘埃远少于非沙质土壤。发现长石砂通过磨蚀产生的粉尘比石英砂更有效。然而,由于全球活性砂中长石砂的空间覆盖率低,长石磨蚀产生的粉尘可能对全球粉尘排放产生相对较小的贡献。因此,我们得出的结论是,由于风沙磨损导致从活动沙子中产生灰尘大小的颗粒的可能性很小。研究结果表明,沙粒磨损机理产生的粉尘少于砂粒表面覆盖的粘土矿物的去除所产生的粉尘。活性砂的两种机理产生的尘埃远少于非沙质土壤。发现长石砂通过磨蚀产生的粉尘比石英砂更有效。然而,由于全球活性砂中长石砂的空间覆盖率低,长石磨蚀产生的粉尘可能对全球粉尘排放产生相对较小的贡献。因此,我们得出的结论是,由于风沙磨损导致从活动沙子中产生灰尘大小的颗粒的可能性很小。活性砂的两种机理产生的尘埃远少于非沙质土壤。发现长石砂通过磨蚀产生的粉尘比石英砂更有效。然而,由于全球活性砂中长石砂的空间覆盖率低,长石磨蚀产生的粉尘可能对全球粉尘排放产生相对较小的贡献。因此,我们得出的结论是,由于风沙磨损导致从活动沙子中产生灰尘大小的颗粒的可能性很小。活性砂的两种机理产生的尘埃远少于非沙质土壤。发现长石砂通过磨蚀产生的粉尘比石英砂更有效。然而,由于全球活性砂中长石砂的空间覆盖率低,长石磨蚀产生的粉尘可能对全球粉尘排放产生相对较小的贡献。因此,我们得出的结论是,由于风沙磨损导致从活动沙子中产生灰尘大小的颗粒的可能性很小。
更新日期:2020-07-05
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