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Title: Interannual variability and trends of combustion aerosol and dust in major continental outflows revealed by MODIS retrievals and CAM5 simulations during 2003–2017

Abstract

Emissions and long-range transport of mineral dust and combustion-related aerosol from burning fossil fuels and biomass vary from year to year, driven by the evolution of the economy and changes in meteorological conditions and environmental regulations. This study offers both satellite and model perspectives on the interannual variability and possible trends of combustion aerosol and dust in major continental outflow regions over the past 15 years (2003–2017). The decade-long record of aerosol optical depth (AOD, denoted as τ), separately for combustion aerosol ( τ c) and dust ( τ d), over global oceans is derived from the Collection 6 aerosol products of the Moderate Resolution Imaging Spectroradiometer (MODIS) onboard both Terra and Aqua. These MODIS Aqua datasets, complemented by aerosol source-tagged simulations using the Community Atmospheric Model version 5 (CAM5), are then analyzed to understand the interannual variability and potential trends of τ c and τ d in the major continental outflows. Both MODIS and CAM5consistently yield a similar decreasing trend of –0.017 to –0.020 per decade for τ c over the North Atlantic Ocean and the Mediterranean Sea that is attributable to reduced emissions from North America and Europe, respectively. On the contrary, both MODIS and CAM5 display anmore » increasing trend of +0.017 to +0.036 per decade for τ c over the tropical Indian Ocean, the Bay of Bengal, and the Arabian Sea, which reflects the influence of increased anthropogenic emissions from South Asia and the Middle East in the last 2 decades. Over the northwestern Pacific Ocean, which is often affected by East Asian emissions of pollution and dust, the MODIS retrievals show a decreasing trend of –0.021 per decade for τ c and –0.012 per decade for τ d, which is, however, not reproduced by the CAM5 model. In other outflow regions strongly influenced by biomass burning smoke or dust, both MODIS retrievals and CAM5 simulations show no statistically significant trends; the MODIS-observed interannual variability is usually larger than that of the CAM5 simulation.« less

Authors:
 [1]; ORCiD logo [2];  [2];  [3];  [1]; ORCiD logo [1];  [4]; ORCiD logo [2];  [5];  [5]
  1. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Bay Area Environmental Research Institute, Petaluma, CA (United States); NASA Ames Research Center, Moffett Field, CA (United States)
  4. Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States)
  5. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1592420
Report Number(s):
PNNL-SA-147334
Journal ID: ISSN 1680-7324
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 20; Journal Issue: 1; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Yu, Hongbin, Yang, Yang, Wang, Hailong, Tan, Qian, Chin, Mian, Levy, Robert C., Remer, Lorraine A., Smith, Steven J., Yuan, Tianle, and Shi, Yingxi. Interannual variability and trends of combustion aerosol and dust in major continental outflows revealed by MODIS retrievals and CAM5 simulations during 2003–2017. United States: N. p., 2020. Web. doi:10.5194/acp-20-139-2020.
Yu, Hongbin, Yang, Yang, Wang, Hailong, Tan, Qian, Chin, Mian, Levy, Robert C., Remer, Lorraine A., Smith, Steven J., Yuan, Tianle, & Shi, Yingxi. Interannual variability and trends of combustion aerosol and dust in major continental outflows revealed by MODIS retrievals and CAM5 simulations during 2003–2017. United States. doi:10.5194/acp-20-139-2020.
Yu, Hongbin, Yang, Yang, Wang, Hailong, Tan, Qian, Chin, Mian, Levy, Robert C., Remer, Lorraine A., Smith, Steven J., Yuan, Tianle, and Shi, Yingxi. Fri . "Interannual variability and trends of combustion aerosol and dust in major continental outflows revealed by MODIS retrievals and CAM5 simulations during 2003–2017". United States. doi:10.5194/acp-20-139-2020. https://www.osti.gov/servlets/purl/1592420.
@article{osti_1592420,
title = {Interannual variability and trends of combustion aerosol and dust in major continental outflows revealed by MODIS retrievals and CAM5 simulations during 2003–2017},
author = {Yu, Hongbin and Yang, Yang and Wang, Hailong and Tan, Qian and Chin, Mian and Levy, Robert C. and Remer, Lorraine A. and Smith, Steven J. and Yuan, Tianle and Shi, Yingxi},
abstractNote = {Emissions and long-range transport of mineral dust and combustion-related aerosol from burning fossil fuels and biomass vary from year to year, driven by the evolution of the economy and changes in meteorological conditions and environmental regulations. This study offers both satellite and model perspectives on the interannual variability and possible trends of combustion aerosol and dust in major continental outflow regions over the past 15 years (2003–2017). The decade-long record of aerosol optical depth (AOD, denoted as τ), separately for combustion aerosol (τc) and dust (τd), over global oceans is derived from the Collection 6 aerosol products of the Moderate Resolution Imaging Spectroradiometer (MODIS) onboard both Terra and Aqua. These MODIS Aqua datasets, complemented by aerosol source-tagged simulations using the Community Atmospheric Model version 5 (CAM5), are then analyzed to understand the interannual variability and potential trends of τc and τd in the major continental outflows. Both MODIS and CAM5consistently yield a similar decreasing trend of –0.017 to –0.020 per decade for τc over the North Atlantic Ocean and the Mediterranean Sea that is attributable to reduced emissions from North America and Europe, respectively. On the contrary, both MODIS and CAM5 display an increasing trend of +0.017 to +0.036 per decade for τc over the tropical Indian Ocean, the Bay of Bengal, and the Arabian Sea, which reflects the influence of increased anthropogenic emissions from South Asia and the Middle East in the last 2 decades. Over the northwestern Pacific Ocean, which is often affected by East Asian emissions of pollution and dust, the MODIS retrievals show a decreasing trend of –0.021 per decade for τc and –0.012 per decade for τd, which is, however, not reproduced by the CAM5 model. In other outflow regions strongly influenced by biomass burning smoke or dust, both MODIS retrievals and CAM5 simulations show no statistically significant trends; the MODIS-observed interannual variability is usually larger than that of the CAM5 simulation.},
doi = {10.5194/acp-20-139-2020},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 1,
volume = 20,
place = {United States},
year = {2020},
month = {1}
}

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