Aerosol-Climate Interaction

A special issue of Atmosphere (ISSN 2073-4433). This special issue belongs to the section "Aerosols".

Deadline for manuscript submissions: closed (23 October 2020) | Viewed by 22170

Special Issue Editor


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Guest Editor
Department of Atmospheric Sciences, Kongju National University, Gongju, Korea
Interests: climate variability; climate change; atmospheric physics; aerosols

Special Issue Information

Aerosol–Climate Interaction (ACI) is a key component in the understanding of climate variability and climate change at regional and global scales. Atmospheric aerosols originate from both natural and anthropogenic sources and can affect the climate in complex ways through aerosol–radiation and aerosol–cloud interactions, which are incompletely captured by climate models as primary mechanisms. Aerosols can affect temperature, rainfall, and atmospheric circulation on regional and global scales through radiative forcing and microphysical effects. Previously, many GCMs and observational studies investigated the impacts of aerosols on regional and global changes in precipitation, temperature, and atmospheric circulation. However, there are still large gaps in our understanding of aerosols, their interactions with radiation and cloud, and their effect on the climate. On the other hand, climate change also can affect the behavior of atmospheric aerosols, i.e., accumulation, transport, and deposition, in multiple ways through changes in atmospheric stagnation, transport pass way, and ventilation intensity, leading to episodes of high air pollution, for example, the high PM10 episode on January 2014 in China. There is still ample room to explore the link between climate change and air pollution both in the past and in the future. For example, the rapid reduction in Arctic sea ice concentration may be one of key factors in modulating the intensity and frequency in high episode events of air pollution through remote forcing from the Arctic to mid-latitude.

This Special Issue of Atmosphere aims to present a collection of studies that advance the knowledge on the ACI. We invite authors to submit original articles that focus on the ACI on regional and global scales, their impacts, and associated physical mechanisms including extreme events, such as heat waves, droughts, and heavy rainfall, using observations, remote sensing, and numerical models.

Dr. Maeng-Ki Kim
Guest Editor

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Keywords

  • aerosol–radiation interaction
  • aerosol–cloud interaction
  • absorbing aerosols and their climate impact
  • aerosol and monsoon
  • climate change and air pollution
  • aerosol and extreme events

Published Papers (7 papers)

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Research

12 pages, 4856 KiB  
Article
Observational Analysis of Aerosol–Meteorology Interactions for the Severe Haze Episode in Korea
by Seung-Hee Eun, Sung-Min Park, Byung-Gon Kim, Jin-Soo Park and Ki-Ho Chang
Atmosphere 2021, 12(1), 33; https://doi.org/10.3390/atmos12010033 - 30 Dec 2020
Cited by 2 | Viewed by 2115
Abstract
Korea has occasionally suffered from various kinds of severe hazes such as long-range transported aerosol (LH), yellow sand (YS), and urban haze (UH). We classified haze days into LH, YS, and UH and analyzed the characteristics of its associated meteorological conditions for 2011–2016 [...] Read more.
Korea has occasionally suffered from various kinds of severe hazes such as long-range transported aerosol (LH), yellow sand (YS), and urban haze (UH). We classified haze days into LH, YS, and UH and analyzed the characteristics of its associated meteorological conditions for 2011–2016 using reanalysis data and surface observations. The results show that higher boundary layer height and stronger wind speed were found for the LH and YS hazes relative to those for UH. Intensive analysis on a golden episode of 10–18 January 2013 indicates that the cloud fraction increased along with extended light precipitation at a weaker rate by enhanced aerosol loading for an unprecedented LH event, which in turn brought about a decrease in boundary layer height (BLH) with less irradiance, that is, much stronger stability. Later, the intensified stability after the LH event accumulated and increased domestic aerosols, and eventually resulted in the longer-lasting severe haze. This study suggests that aerosol–meteorology interactions play an important role in both short-term weather and fine particle forecasts, especially on polluted days. Full article
(This article belongs to the Special Issue Aerosol-Climate Interaction)
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12 pages, 3756 KiB  
Article
The Lagged Effect of Anthropogenic Aerosol on East Asian Precipitation during the Summer Monsoon Season
by Su-Jung Lee, Yong-Cheol Jeong and Sang-Wook Yeh
Atmosphere 2020, 11(12), 1356; https://doi.org/10.3390/atmos11121356 - 14 Dec 2020
Cited by 2 | Viewed by 2387
Abstract
The authors investigated the lagged effect of anthropogenic aerosols (AAs) during the premonsoon season (April–May–June) on the East Asian precipitation during the postmonsoon season (July–August) using the aerosol optical depth (AOD) from a satellite dataset and reanalysis datasets. When the AOD is high [...] Read more.
The authors investigated the lagged effect of anthropogenic aerosols (AAs) during the premonsoon season (April–May–June) on the East Asian precipitation during the postmonsoon season (July–August) using the aerosol optical depth (AOD) from a satellite dataset and reanalysis datasets. When the AOD is high in Eastern China during the premonsoon season, the amount of precipitation increases in the western North Pacific, including the Korean Peninsula and Japan, during the postmonsoon season. The amount of cloud in the western-to-central North Pacific in the premonsoon season increases during the high-AOD period. Subsequently, it cools the sea surface temperature until the postmonsoon season, which strengthens the North Pacific High. The strengthened North Pacific High in the postmonsoon season expands to the western North Pacific, which leads to the enhancement of the moisture flows from the ocean. This results in the increase in precipitation in the western North Pacific, including the Korean Peninsula and Japan, during the postmonsoon season. Full article
(This article belongs to the Special Issue Aerosol-Climate Interaction)
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19 pages, 6881 KiB  
Article
Impact of Meteorological Changes on Particulate Matter and Aerosol Optical Depth in Seoul during the Months of June over Recent Decades
by Seohee H. Yang, Jaein I. Jeong, Rokjin J. Park and Minjoong J. Kim
Atmosphere 2020, 11(12), 1282; https://doi.org/10.3390/atmos11121282 - 27 Nov 2020
Cited by 10 | Viewed by 2690
Abstract
The effects of meteorological changes on particulate matter with a diameter of 10 microns or less (PM10, referred to as PM in this study) and aerosol optical depth (AOD) in Seoul were investigated using observational and modeling analysis. AOD satellite data [...] Read more.
The effects of meteorological changes on particulate matter with a diameter of 10 microns or less (PM10, referred to as PM in this study) and aerosol optical depth (AOD) in Seoul were investigated using observational and modeling analysis. AOD satellite data were used, obtained from the Moderate Resolution Imaging Spectroradiometer (MODIS), and PM concentration data were used from in-situ observations. The Modern-Era Retrospective Analysis for Research and Applications (MERRA) and MERRA Version 2 (MERRA-2) were used for meteorological field analysis in modeling and observation data. The results from this investigation show that meteorological effects on PM and AOD were strong in the month of June, revealing a clear decreasing trend in recent decades. The investigation focused on the underlying mechanisms influencing the reduction in PM resulting from meteorological changes during the months of June. The results of this study reveal that decreases in atmospheric stability and humidity induced the aerosol change observed in recent decades. The changes in atmospheric stability and humidity are highly correlated with changes in the intensity of the East Asian summer monsoon (EASM). This suggests that the unstable and drying atmosphere by weakening of the EASM in recent decades has improved PM air quality in Seoul during the summer. The effects of atmospheric stability and humidity were also observed to vary depending on the aerosol species. Humidity only affects hydrophilic aerosols such as sulfate, nitrate, and ammonium, whereas atmospheric stability affects all species of aerosols, including carbonaceous aerosols. Full article
(This article belongs to the Special Issue Aerosol-Climate Interaction)
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15 pages, 3980 KiB  
Article
Aerosol Effective Radiative Forcing in the Online Aerosol Coupled CAS-FGOALS-f3-L Climate Model
by Hao Wang, Tie Dai, Min Zhao, Daisuke Goto, Qing Bao, Toshihiko Takemura, Teruyuki Nakajima and Guangyu Shi
Atmosphere 2020, 11(10), 1115; https://doi.org/10.3390/atmos11101115 - 17 Oct 2020
Cited by 5 | Viewed by 3851
Abstract
The effective radiative forcing (ERF) of anthropogenic aerosol can be more representative of the eventual climate response than other radiative forcing. We incorporate aerosol–cloud interaction into the Chinese Academy of Sciences Flexible Global Ocean–Atmosphere–Land System (CAS-FGOALS-f3-L) by coupling an existing aerosol module named [...] Read more.
The effective radiative forcing (ERF) of anthropogenic aerosol can be more representative of the eventual climate response than other radiative forcing. We incorporate aerosol–cloud interaction into the Chinese Academy of Sciences Flexible Global Ocean–Atmosphere–Land System (CAS-FGOALS-f3-L) by coupling an existing aerosol module named the Spectral Radiation Transport Model for Aerosol Species (SPRINTARS) and quantified the ERF and its primary components (i.e., effective radiative forcing of aerosol-radiation interactions (ERFari) and aerosol-cloud interactions (ERFaci)) based on the protocol of current Coupled Model Intercomparison Project phase 6 (CMIP6). The spatial distribution of the shortwave ERFari and ERFaci in CAS-FGOALS-f3-L are comparable with that of most available CMIP6 models. The global mean 2014–1850 shortwave ERFari in CAS-FGOALS-f3-L (−0.27 W m−2) is close to the multi-model means in 4 available models (−0.29 W m−2), whereas the assessing shortwave ERFaci (−1.04 W m−2) and shortwave ERF (−1.36 W m−2) are slightly stronger than the multi-model means, illustrating that the CAS-FGOALS-f3-L can reproduce the aerosol radiation effect reasonably well. However, significant diversity exists in the ERF, especially in the dominated component ERFaci, implying that the uncertainty is still large. Full article
(This article belongs to the Special Issue Aerosol-Climate Interaction)
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14 pages, 4558 KiB  
Article
The Impacts of Aerosol Emissions on Historical Climate in UKESM1
by Jeongbyn Seo, Sungbo Shim, Sang-Hoon Kwon, Kyung-On Boo, Yeon-Hee Kim, Fiona O’Connor, Ben Johnson, Mohit Dalvi, Gerd Folberth, Joao Teixeira, Jane Mulcahy, Catherine Hardacre, Steven Turnock, Stephanie Woodward, Luke Abraham, James Keeble, Paul Griffiths, Alex Archibald, Mark Richardson, Chris Dearden, Ken Carslaw, Jonny Williams, Guang Zeng and Olaf Morgensternadd Show full author list remove Hide full author list
Atmosphere 2020, 11(10), 1095; https://doi.org/10.3390/atmos11101095 - 14 Oct 2020
Cited by 5 | Viewed by 3871
Abstract
As one of the main drivers for climate change, it is important to understand changes in anthropogenic aerosol emissions and evaluate the climate impact. Anthropogenic aerosols have affected global climate while exerting a much larger influence on regional climate by their short lifetime [...] Read more.
As one of the main drivers for climate change, it is important to understand changes in anthropogenic aerosol emissions and evaluate the climate impact. Anthropogenic aerosols have affected global climate while exerting a much larger influence on regional climate by their short lifetime and heterogeneous spatial distribution. In this study, the effective radiative forcing (ERF), which has been accepted as a useful index for quantifying the effect of climate forcing, was evaluated to understand the effects of aerosol on regional climate over a historical period (1850–2014). Eastern United States (EUS), Western European Union (WEU), and Eastern Central China (ECC), are regions that predominantly emit anthropogenic aerosols and were analyzed using Coupled Model Intercomparison Project 6 (CMIP6) simulations implemented within the framework of the Aerosol Chemistry Model Intercomparison Project (AerChemMIP) in the UK’s Earth System Model (UKESM1). In EUS and WEU, where industrialization occurred relatively earlier, the negative ERF seems to have been recovering in recent decades based on the decreasing trend of aerosol emissions. Conversely, the radiative cooling in ECC seems to be strengthened as aerosol emission continuously increases. These aerosol ERFs have been largely attributed to atmospheric rapid adjustments, driven mainly by aerosol-cloud interactions rather than direct effects of aerosol such as scattering and absorption. Full article
(This article belongs to the Special Issue Aerosol-Climate Interaction)
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13 pages, 4419 KiB  
Article
Distribution Characteristics of Aerosol Size and CCN during the Summer on Mt. Tian and Their Influencing Factors
by Ankang Liu, Honglei Wang, Yuanyuan Li, Yan Yin, Bin Li, Kui Chen, Yi Cui, Chuan He and Mingming Dai
Atmosphere 2020, 11(9), 912; https://doi.org/10.3390/atmos11090912 - 27 Aug 2020
Cited by 5 | Viewed by 3140
Abstract
The aerosol size distribution and cloud condensation nuclei (CCN) number concentration were measured using a wide-range particle spectrometer (WPS) and a cloud condensation nuclei counter (CCNC) on Mt. Tian from 31 July to 9 September, 2019. Combined with meteorological data, distribution characteristics of [...] Read more.
The aerosol size distribution and cloud condensation nuclei (CCN) number concentration were measured using a wide-range particle spectrometer (WPS) and a cloud condensation nuclei counter (CCNC) on Mt. Tian from 31 July to 9 September, 2019. Combined with meteorological data, distribution characteristics of aerosol size and CCN and their influencing factors were analyzed. The results indicated that the mean aerosol number concentration was 5475.6 ± 5636.5 cm−3. The mean CCN concentrations were 183.7 ± 114.5 cm−3, 729.8 ± 376.1 cm−3, 1630.5 ± 980.5 cm−3, 2162.5 ± 1345.3 cm−3, and 2575.7 ± 1632.9 cm−3 at supersaturation levels of 0.1%, 0.2%, 0.4%, 0.6%, and 0.8%, respectively. The aerosol number size distribution is unimodal, and the dominant particle size is 30–60 nm. Affected by the height of the boundary layer and the valley wind, the diurnal variation in aerosol number concentration shows a unimodal distribution with a peak at 17:00, and the CCN number concentration showed a bimodal distribution with peaks at 18:00 and 21:00. The particle size distribution and supersaturation have a major impact on the activation of the aerosol into CCN. At 0.1% supersaturation (S), the 300–500 nm particles are most likely to activate to CCN. Particles of 100–300 nm are most easily activated at 0.2% (S), while particles of 60–80 nm are most likely activated at high supersaturation (≥0.4%). The concentrations of aerosol and CCN are higher in the northerly wind. Ambient relative humidity (RH) has little relationship with the aerosol activation under high supersaturation. According to N = CSk fitting the CCN spectrum, C = 3297 and k = 0.90 on Mt. Tian, characteristic of the clean continental type. Full article
(This article belongs to the Special Issue Aerosol-Climate Interaction)
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20 pages, 9253 KiB  
Article
Optical and Physical Characteristics of Aerosol Vertical Layers over Northeastern China
by Bo Su, Hao Li, Miao Zhang, Muhammad Bilal, Minxia Wang, Luqman Atique, Ziyue Zhang, Chun Zhang, Ge Han, Zhongfeng Qiu and Md. Arfan Ali
Atmosphere 2020, 11(5), 501; https://doi.org/10.3390/atmos11050501 - 13 May 2020
Cited by 15 | Viewed by 3066
Abstract
The optical and physical characteristics of the aerosol vertical layers over Northeastern China (NEC) are investigated using the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) Level 2 layer products from 2007 to 2014. To better examine the spatial and temporal variations in [...] Read more.
The optical and physical characteristics of the aerosol vertical layers over Northeastern China (NEC) are investigated using the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) Level 2 layer products from 2007 to 2014. To better examine the spatial and temporal variations in the characteristics of aerosols over NEC, the region is divided into three parts (Heilongjiang province, Jilin province, and Liaoning province) to analyze the inter-annual and seasonal variations of nine selected aerosol parameters in each part during night and day times. The results reveal that the values of aerosol optical depth (AOD) increase year by year, over the whole NEC, being relatively high over the Liaoning (LN) province; this might be induced by higher levels of economic development and agricultural activity. The highest AOD values appear in summer, which is plausibly related to the temperate monsoon climate in NEC. Higher AOD values exist during the daytime than at night; this is intuitively the result of higher daytime anthropogenic activities. The base altitude of the lowest aerosol layer (BAL) and the top altitude of the highest aerosol layer (TAH) varied significantly due to the topography of NEC. The number of aerosol layers (N) is relatively large over LN, which might be caused by a relatively stronger atmospheric convection over this landscape. The thickness of the lowest aerosol layer (TLL) bore little relationship with the topography of NEC. The AOD proportion of the lowest aerosol layer (PAODL) is high (0.70 to 0.85 for the entire NEC), indicating that aerosols are mainly concentrated in the lowest layer of the atmosphere. The volume depolarization ratio of the lowest aerosol layer (VDRL) is large during spring and winter due to the presence of dust aerosols. The color ratio of the lowest aerosol layer (CRL) is large during the day due to relatively more human activities taking place than at night. Moreover, there is a significantly positive linear correlation between N and TAH, and a negative logarithm correlation between N and PAODL over NEC. The results of this study could provide researchers and the government departments with detailed and certain optical and physical information about aerosol layers over NEC, to help in the treatment of air pollution over NEC. Full article
(This article belongs to the Special Issue Aerosol-Climate Interaction)
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