Spatiotemporal changes in aerosol properties by hygroscopic growth and impacts on radiative forcing and heating rates during DISCOVER-AQ 2011
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Published:2021-08-11
Issue:15
Volume:21
Page:12021-12048
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Pérez-Ramírez DanielORCID, Whiteman David N., Veselovskii Igor, Ferrare Richard, Titos GloriaORCID, Granados-Muñoz María JoséORCID, Sánchez-Hernández Guadalupe, Navas-Guzmán FranciscoORCID
Abstract
Abstract. This work focuses on the characterization of vertically resolved aerosol
hygroscopicity properties and their direct radiative effects through a
unique combination of ground-based and airborne remote sensing measurements
during the Column and Vertically
Resolved Observations Relevant to Air Quality (DISCOVER-AQ) 2011 field campaign in the Baltimore–Washington DC metropolitan area. To that end, we combined aerosol measurements
from a multiwavelength Raman lidar located at NASA Goddard Space Flight
Center and the airborne NASA Langley High Spectral Resolution Lidar-1 (HSRL-1) lidar system. In situ
measurements aboard the P-3B airplane and ground-based Aerosol Robotic Network – Distributed Regional Aerosol Gridded
Observational Network (AERONET-DRAGON)
served to validate and complement quantifications of aerosol hygroscopicity
from lidar measurements and also to extend the study both temporally and
spatially. The focus here is on 22 and 29 July 2011,
which were very humid days and characterized by a stable atmosphere and
increasing relative humidity with height in the planetary boundary layer
(PBL). Combined lidar and radiosonde (temperature and water vapor mixing
ratio) measurements allowed the retrieval of the Hänel hygroscopic
growth factor which agreed with that obtained from airborne in situ
measurements and also explained the significant increase of extinction and
backscattering with height. Airborne measurements also confirmed aerosol
hygroscopicity throughout the entire day in the PBL and identified sulfates
and water-soluble organic carbon as the main species of aerosol particles.
The combined Raman and HSRL-1 measurements permitted the inversion for
aerosol microphysical properties revealing an increase of particle radius
with altitude consistent with hygroscopic growth. Aerosol hygroscopicity
pattern served as a possible explanation of aerosol optical depth increases
during the day, particularly for fine-mode particles. Lidar measurements
were used as input to the libRadtran radiative transfer code to obtain
vertically resolved aerosol radiative effects and heating rates under dry
and humid conditions, and the results reveal that aerosol hygroscopicity is
responsible for larger cooling effects in the shortwave range (7–10 W m−2
depending on aerosol load) near the ground, while heating rates
produced a warming of 0.12 K d−1 near the top of PBL where aerosol
hygroscopic growth was highest.
Funder
H2020 Marie Skłodowska-Curie Actions
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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