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Biological crust in sand and dust storm source areas of Asia and its impact on dust emission

Advances in Climate Change Research 2021年第3期12卷 395-408页

作者： ZHANG Jian ZHOU Chun-Hong GUI Hai-Lin ZHANG Xiao-Ye State Key Laboratory of Severe Weather and Key Laboratory of Atmospheric Chemistry of China Meteorological Administration&Institute of Atmospheric Composition Chinese Academy of Meteorological SciencesBeijing100081China National Meteorological Center China Meteorological AdministrationBeijing100081China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen361021China

Even though the biological crusts are critical to dust emissions,no sand and dust forecast model have considered the impacts of the biological crust in dust emission *** situation mainly comes from two scientific difficulties:there is no large scale regional biological crust data available that can be used in the forecast model;there is no quantification of how biological crusts impact on sand *** this way,we studied the distribution of biological soil crust in sand and dust storm source areas of Central and East Asia using Moderate Resolution Imaging Spectroradiometer satellite surface reflectance data collected in 2000—2019 to determine its potential impact on dust emission according to two empirical *** further evaluated the relationships between soil crust coverage,roughness length,and dust emission to study SDS source *** found that biological crust is widely distributed in SDS source areas of Central and East Asia,with coverage rates of 19.8%in Central Asian deserts,23.1%in the Gobi Desert,and 17.3%—32.8%in Chinese deserts(p>0.05).Cyanobacteria and lichen coverage has increased in Chinese deserts,reflecting the recent impacts of the Project of Returning Farmland to Grassland and Farmland to ***,biological soil crust coverage has not increased in Central Asian deserts or the Gobi Desert,and that in Central Asian deserts continues to decrease,demonstrating the complexity of the combined effects of human activities and climate change on its *** soil crust increased the roughness length of Central and East Asian SDS source areas by 0.14—0.62 *** suppression of dust emission due to biological soil crust did not change among years during the study *** horizontal and vertical dust flux inhibition coefficient(DFIC)were 2.0—11.0 and 1.7—2.9(p>0.05),respectively,clearly showing a suppressive *** of the ecological environment in some deserts can lead to the ability of these crusts to inh

关键词： Biological soil crust dust emission Satellite retrieval sand and dust storm source Central and East Asia

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