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Short-term Aerosol Trends: Reality or Myth?The main questions addressed in this slide presentation involve short-term trends of MODIS aerosol optical thickness (AOT) over 6 years: (1) Why are the trends different in different regions? (2) How are these trends so high? (3) Why are they "coherent" in many areas? (4) Are these changes in aerosol concentrations real, i.e., are they monotonic changes in emissions? Several views of the Spatial Distribution of AOT from Terra are shown. In conclusion there are several trends: (1) There is a broad spatial inhomogenueity in AOT trends over 6 years of MODIS Terra and Aqua (2) Some of the areas demonstrate clear positive trends related to increase of emission (e.g., Eastern China) (3) Strong trends in some other areas are superficial and might be attributed, in part, to: (3a) Least squares linear trend sensitivity to outliers (need to use more robust linear fitting method) (3b) Spatial and temporal shifts or trends in meteorological conditions, especially in wind patterns responsible for aerosol transport (6) Aerosol trends should be studied together with changes in meteorology patterns as they might closely linked together
Document ID
20100003357
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Leptoukh, Gregory (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Zubko, Viktor (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 25, 2013
Publication Date
July 13, 2009
Subject Category
Meteorology And Climatology
Meeting Information
Meeting: IGARSS - 2009 IEEE International Geoscience and Remote Sensing Symposium
Location: Cape Town
Country: South Africa
Start Date: July 13, 2009
End Date: July 17, 2009
Distribution Limits
Public
Copyright
Public Use Permitted.

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