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Title: Model representations of aerosol layers transported from North America over the Atlantic Ocean during the Two-Column Aerosol Project

Abstract

The ability of the Weather Research and Forecasting model with chemistry (WRF-Chem) version 3.7 and the Community Atmosphere Model version 5.3 (CAM5) in simulating profiles of aerosol properties is quantified using extensive in situ and remote sensing measurements from the Two Column Aerosol Project (TCAP) conducted during July of 2012. TCAP was supported by the U.S. Department of Energy’s Atmospheric Radiation Measurement program and was designed to obtain observations within two atmospheric columns; one fixed over Cape Cod, Massachusetts and the other several hundred kilometers over the ocean. The performance is quantified using most of the available aircraft and surface measurements during July, and two days are examined in more detail to identify the processes responsible for the observed aerosol layers. The higher resolution WRF-Chem model produced more aerosol mass in the free troposphere than the coarser resolution CAM5 model so that the fraction of aerosol optical thickness above the residual layer from WRF-Chem was more consistent with lidar measurements. We found that the free troposphere layers are likely due to mean vertical motions associated with synoptic-scale convergence that lifts aerosols from the boundary layer. The vertical displacement and the time period associated with upward transport in the troposphere dependmore » on the strength of the synoptic system and whether relatively high boundary layer aerosol concentrations are present where convergence occurs. While a parameterization of subgrid scale convective clouds applied in WRF-Chem modulated the concentrations of aerosols aloft, it did not significantly change the overall altitude and depth of the layers.« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [2];  [2];  [1];  [3];  [4];  [1];  [1];  [4];  [1];  [3];  [1];  [1];  [1]
  1. Pacific Northwest National Laboratory, Richland Washington USA
  2. NASA Langley Research Center, Hampton Virginia USA
  3. Department of Chemistry, Colorado University, Boulder Colorado USA
  4. Brookhaven National Laboratory, Upton New York USA
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1340781
Report Number(s):
PNNL-SA-119932
Journal ID: ISSN 2169-897X; 49096; KP1701000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Geophysical Research: Atmospheres; Journal Volume: 121; Journal Issue: 16
Country of Publication:
United States
Language:
English
Subject:
Environmental Molecular Sciences Laboratory

Citation Formats

Fast, Jerome D., Berg, Larry K., Zhang, Kai, Easter, Richard C., Ferrare, Richard A., Hair, Johnathan W., Hostetler, Chris A., Liu, Ying, Ortega, Ivan, Sedlacek, Arthur, Shilling, John E., Shrivastava, Manish, Springston, Stephen R., Tomlinson, Jason M., Volkamer, Rainer, Wilson, Jacqueline, Zaveri, Rahul A., and Zelenyuk, Alla. Model representations of aerosol layers transported from North America over the Atlantic Ocean during the Two-Column Aerosol Project. United States: N. p., 2016. Web. doi:10.1002/2016JD025248.
Fast, Jerome D., Berg, Larry K., Zhang, Kai, Easter, Richard C., Ferrare, Richard A., Hair, Johnathan W., Hostetler, Chris A., Liu, Ying, Ortega, Ivan, Sedlacek, Arthur, Shilling, John E., Shrivastava, Manish, Springston, Stephen R., Tomlinson, Jason M., Volkamer, Rainer, Wilson, Jacqueline, Zaveri, Rahul A., & Zelenyuk, Alla. Model representations of aerosol layers transported from North America over the Atlantic Ocean during the Two-Column Aerosol Project. United States. doi:10.1002/2016JD025248.
Fast, Jerome D., Berg, Larry K., Zhang, Kai, Easter, Richard C., Ferrare, Richard A., Hair, Johnathan W., Hostetler, Chris A., Liu, Ying, Ortega, Ivan, Sedlacek, Arthur, Shilling, John E., Shrivastava, Manish, Springston, Stephen R., Tomlinson, Jason M., Volkamer, Rainer, Wilson, Jacqueline, Zaveri, Rahul A., and Zelenyuk, Alla. Mon . "Model representations of aerosol layers transported from North America over the Atlantic Ocean during the Two-Column Aerosol Project". United States. doi:10.1002/2016JD025248.
@article{osti_1340781,
title = {Model representations of aerosol layers transported from North America over the Atlantic Ocean during the Two-Column Aerosol Project},
author = {Fast, Jerome D. and Berg, Larry K. and Zhang, Kai and Easter, Richard C. and Ferrare, Richard A. and Hair, Johnathan W. and Hostetler, Chris A. and Liu, Ying and Ortega, Ivan and Sedlacek, Arthur and Shilling, John E. and Shrivastava, Manish and Springston, Stephen R. and Tomlinson, Jason M. and Volkamer, Rainer and Wilson, Jacqueline and Zaveri, Rahul A. and Zelenyuk, Alla},
abstractNote = {The ability of the Weather Research and Forecasting model with chemistry (WRF-Chem) version 3.7 and the Community Atmosphere Model version 5.3 (CAM5) in simulating profiles of aerosol properties is quantified using extensive in situ and remote sensing measurements from the Two Column Aerosol Project (TCAP) conducted during July of 2012. TCAP was supported by the U.S. Department of Energy’s Atmospheric Radiation Measurement program and was designed to obtain observations within two atmospheric columns; one fixed over Cape Cod, Massachusetts and the other several hundred kilometers over the ocean. The performance is quantified using most of the available aircraft and surface measurements during July, and two days are examined in more detail to identify the processes responsible for the observed aerosol layers. The higher resolution WRF-Chem model produced more aerosol mass in the free troposphere than the coarser resolution CAM5 model so that the fraction of aerosol optical thickness above the residual layer from WRF-Chem was more consistent with lidar measurements. We found that the free troposphere layers are likely due to mean vertical motions associated with synoptic-scale convergence that lifts aerosols from the boundary layer. The vertical displacement and the time period associated with upward transport in the troposphere depend on the strength of the synoptic system and whether relatively high boundary layer aerosol concentrations are present where convergence occurs. While a parameterization of subgrid scale convective clouds applied in WRF-Chem modulated the concentrations of aerosols aloft, it did not significantly change the overall altitude and depth of the layers.},
doi = {10.1002/2016JD025248},
journal = {Journal of Geophysical Research: Atmospheres},
number = 16,
volume = 121,
place = {United States},
year = {Mon Aug 22 00:00:00 EDT 2016},
month = {Mon Aug 22 00:00:00 EDT 2016}
}