DOI: 10.1029/2012JD017907
论文题名: The effect of the dynamic surface bareness on dust source function, emission, and distribution
作者: Kim D. ; Chin M. ; Bian H. ; Tan Q. ; Brown M.E. ; Zheng T. ; You R. ; Diehl T. ; Ginoux P. ; Kucsera T.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 2 起始页码: 871
结束页码: 886
语种: 英语
Scopus关键词: Advanced very high resolution radiometers (AVHRR)
; Air quality
; Atmospheric aerosols
; Climate change
; Computer simulation
; Vegetation
; Aerosol optical depths
; Aerosol radiation
; Cultivated crops
; Ground-based remote sensing
; Normalized difference vegetation index
; Seasonal variation
; Source functions
; Temporal variation
; Dust
; atmospheric pollution
; climate change
; dust
; emission
; land use change
; NDVI
; numerical model
; optical depth
; pollutant source
; radiometer
; satellite imagery
; seasonality
英文摘要: In this study we report the development of a time dependency of global dust source and its impact on dust simulation in the Goddard Chemistry Aerosol Radiation and Transport (GOCART) model. We determine the surface bareness using the 8 km normalized difference vegetation index (NDVI) observed from the advanced very high resolution radiometer satellite. The results are used to analyze the temporal variations of surface bareness in 22 global dust source regions. One half of these regions can be considered permanent dust source regions where NDVI is always less than 0.15, while the other half shows substantial seasonality of NDVI. This NDVI-based surface bareness map is then used, along with the soil and topographic characteristics, to construct a dynamic dust source function for simulating dust emissions with the GOCART model. We divide the 22 dust source regions into three groups of (I) permanent desert, (II) seasonally changing bareness that regulates dust emissions, and (III) seasonally changing bareness that has little effect on dust emission. Compared with the GOCART results with the previously employed static dust source function, the simulation with the new dynamic source function shows significant improvements in category II regions. Even though the global improvement of the aerosol optical depth (AOD) is rather small when compared with satellite and ground-based remote sensing observations, we found a clear and significant effect of the new dust source on seasonal variation of dust emission and dust optical depth near the source regions. Globally, we have found that the permanent bare land contributes to 88% of the total dust emission, whereas the grassland and cultivated crops land contribute to about 12%. Our results suggest the potential of using NDVI over a vegetated area to link the dust emission with land cover and land use change for air quality and climate change studies. © 2012. American Geophysical Union. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64030
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
There are no files associated with this item.
作者单位: JCET, University of Maryland, Baltimore, MD 21250, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Universities Space Research Association, Columbia, MD, United States; Montgomery Blair High School, Silver Spring, MD, United States; Department of Mechanical Engineering, University of Maryland, College Park, MD, United States; Thomas Jefferson High School for Science and Technology, Alexandria, VA, United States; Department of Mathematics, Stanford University, Stanford, CA, United States; Geophysical Fluid Dynamics Laboratory, NOAA, Princeton, NJ, United States
Recommended Citation:
Kim D.,Chin M.,Bian H.,et al. The effect of the dynamic surface bareness on dust source function, emission, and distribution[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(2)