DOI: 10.1002/jgrd.50409
论文题名: Tropical Atlantic dust and smoke aerosol variations related to the Madden-Julian Oscillation in MODIS and MISR observations
作者: Guo Y. ; Tian B. ; Kahn R.A. ; Kalashnikova O. ; Wong S. ; Waliser D.E.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 10 起始页码: 4947
结束页码: 4963
语种: 英语
英文关键词: aerosol
; Atlantic
; dust
; MJO
; satellite
; smoke
Scopus关键词: Aerosols
; Climatology
; Radiometers
; Satellite imagery
; Satellites
; Smoke
; Tropics
; Aerosol optical thickness
; Atlantic
; Correlation analysis
; Madden-Julian oscillation
; MJO
; Moderate resolution imaging spectroradiometer
; Multiangle imaging spectroradiometer
; Precipitation anomalies
; Dust
; aerosol
; climatology
; data set
; dust
; Madden-Julian oscillation
; MISR
; MODIS
; sampling
; smoke
; temporal evolution
; trade wind
; winter
; Atlantic Ocean
; Atlantic Ocean (Tropical)
英文摘要: In this study, Moderate Resolution Imaging Spectroradiometer (MODIS) fine mode fraction and Multi-angle Imaging SpectroRadiometer (MISR) nonspherical fraction data are used to derive dust and smoke aerosol optical thickness (τdust and τsmoke ) over the tropical Atlantic in a complementary way: due to its wider swath, MODIS has 3-4 times greater sampling than MISR, but MISR dust discrimination is based on particle shape retrievals, whereas an empirical scheme is used for MODIS. MODIS and MISR show very similar dust and smoke winter climatologies. τdust is the dominant aerosol component over the tropical Atlantic, accounting for 40-70% of the total aerosol optical thickness (AOT), whereas τsmoke is significantly smaller than τdust . The consistency and high correlation between these climatologies and their daily variations lends confidence to their use for investigating the relative dust and smoke contributions to the total AOT variation associated with the Madden-Julian Oscillation (MJO). The temporal evolution and spatial patterns of the τdus anomalies associated with the MJO are consistent between MODIS and MISR: the magnitude of MJO-realted τdust anomalies is comparable to or even larger than that of the total τ, while the τsmoke anomaly represents about 15% compared to the total, which is quite different from their relative magnitudes to the total τ on the climatological time scale. This suggests that dust and smoke are not influenced by the MJO in the same way. Based on correlation analysis, dust is strongly influenced by the MJO-modulated trade wind and precipitation anomalies, and can last as long as one MJO phase, whereas smoke is less affected. Key PointsThe tropical Atlantic dust and smoke aerosols components are derivedComplementary results from two satellite datasets: MODIS and MISR, are examinedThe intraseasonal varibilities of dust and smoke aerosols are investigated ©2013. American Geophysical Union. All Rights Reserved. 资助项目: ATM-0840755
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63773
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Jet Propulsion Laboratory, M/S 233-304, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, United States; Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles CA, United States; NASA Goddard Space Flight Center, Greenbelt MD, United States
Recommended Citation:
Guo Y.,Tian B.,Kahn R.A.,et al. Tropical Atlantic dust and smoke aerosol variations related to the Madden-Julian Oscillation in MODIS and MISR observations[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(10)