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Aerosol Hygroscopicity in Different ...

Lorenzo, Genevieve Rose H.,

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Aerosol Hygroscopicity in Different Marine Regions /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Aerosol Hygroscopicity in Different Marine Regions // Genevieve Rose H Lorenzo.
Author:	Lorenzo, Genevieve Rose H.,
Description:	1 electronic resource (165 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-02, Section: B.
Contained By:	Dissertations Abstracts International86-02B.
Subject:	Atmospheric sciences. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31556783
ISBN:	9798383678732

Aerosol Hygroscopicity in Different Marine Regions /
Lorenzo, Genevieve Rose H.,

Aerosol Hygroscopicity in Different Marine Regions /Genevieve Rose H Lorenzo. - 1 electronic resource (165 pages)

Source: Dissertations Abstracts International, Volume: 86-02, Section: B.

Aerosol hygroscopicity affects Earth's radiation budget, secondary aerosol formation, cloud formation, and health. It is important for correct estimation of the cooling at Earth's surface and for remote sensing. Limited aerosol studies in the complex and moisture-rich environment of Southeast Asia, one of the rapidly developing regions in Asia, motivates the need to understand aerosol hygroscopicity there. This is one of the goals of the NASA Cloud, Aerosol, and Monsoon Processes Philippines Experiment (CAMP2Ex) airborne measurement campaign from August to October 2019. As context for CAMP2Ex, surface and column aerosol characteristics were investigated in the largest megacity in the Philippines, Metro Manila. Background surface aerosol hygroscopicity in Metro Manila is relatively low due to the dominance and high levels of black carbon and organics from local sources. Cases of extreme aerosol loading, as in firework emissions during the New Year 2019, increased the inorganic fraction of aerosols, reduced visibility, and doubled hygroscopicity in Metro Manila for several hours. This extremely unhealthy event was short-lived because the hygroscopic inorganic particles derived from the fireworks were washed out by rain and surface particulate levels went back to background levels. Despite the relatively high surface aerosol particle concentrations in Metro Manila, columnar aerosol optical depth (AOD) has been relatively low compared to other megacities in the region and is another motivation to dig deeper in aerosol characteristics. Cluster analysis of ten-years of clear air data (2009-2018) from the NASA AErosol RObotic NETwork (AERONET) suggests that the atmospheric column above Metro Manila was mostly (58% of the time) due to marine and some local (20% of the time) sources, possibly the reason for the low AOD values. AERONET refractive index values were also low suggesting the presence of relatively hygroscopic particles, strengthening the case of marine aerosol particles being the dominant component over Metro Manila. The make-up of long-range transported aerosol particles depended on the prevailing monsoons, with less and more hygroscopic particles observed during the southwest and northeast monsoon, respectively. In the CAMP2Ex region, biomass burning from Borneo was a major source of non-hygroscopic particles influencing the bulk hygroscopicity in the region during the southwest monsoon. Convective particle transport abounds in the region, and for the specific cases chosen, changed the aerosol characteristics aloft, decreasing and increasing hygroscopicity with increased organic and sulfate mass fractions, respectively, based on field data. A global-scale model represented this change for a large-scale system case during CAMP2Ex, and improvements with model regionalization are desired for more local systems as part of future work. The analysis done was applied to another marine region, the northwest Atlantic Ocean, where the NASA Aerosol Cloud meTeorology Interactions oVer the western ATlantic Experiment (ACTIVATE) conducted numerous flights to study aerosol properties, and especially hygroscopicity. Seasonal aerosol characteristics, particle aging, and cloud processing affected aerosol hygroscopicity measurements in the northwest Atlantic. Non-sea salt inorganics increased hygroscopicity in the winter, while enhanced organic influence decreased hygroscopicity in the summer. These findings on aerosol hygroscopicity can help to improve the representation of aerosols in models and in the understanding of cloud formation in marine areas. 

English

ISBN: 9798383678732Subjects--Topical Terms:

3168354
Atmospheric sciences.
Subjects--Index Terms:

Aerosol

Aerosol Hygroscopicity in Different Marine Regions /
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520 $a Aerosol hygroscopicity affects Earth's radiation budget, secondary aerosol formation, cloud formation, and health. It is important for correct estimation of the cooling at Earth's surface and for remote sensing. Limited aerosol studies in the complex and moisture-rich environment of Southeast Asia, one of the rapidly developing regions in Asia, motivates the need to understand aerosol hygroscopicity there. This is one of the goals of the NASA Cloud, Aerosol, and Monsoon Processes Philippines Experiment (CAMP2Ex) airborne measurement campaign from August to October 2019. As context for CAMP2Ex, surface and column aerosol characteristics were investigated in the largest megacity in the Philippines, Metro Manila. Background surface aerosol hygroscopicity in Metro Manila is relatively low due to the dominance and high levels of black carbon and organics from local sources. Cases of extreme aerosol loading, as in firework emissions during the New Year 2019, increased the inorganic fraction of aerosols, reduced visibility, and doubled hygroscopicity in Metro Manila for several hours. This extremely unhealthy event was short-lived because the hygroscopic inorganic particles derived from the fireworks were washed out by rain and surface particulate levels went back to background levels. Despite the relatively high surface aerosol particle concentrations in Metro Manila, columnar aerosol optical depth (AOD) has been relatively low compared to other megacities in the region and is another motivation to dig deeper in aerosol characteristics. Cluster analysis of ten-years of clear air data (2009-2018) from the NASA AErosol RObotic NETwork (AERONET) suggests that the atmospheric column above Metro Manila was mostly (58% of the time) due to marine and some local (20% of the time) sources, possibly the reason for the low AOD values. AERONET refractive index values were also low suggesting the presence of relatively hygroscopic particles, strengthening the case of marine aerosol particles being the dominant component over Metro Manila. The make-up of long-range transported aerosol particles depended on the prevailing monsoons, with less and more hygroscopic particles observed during the southwest and northeast monsoon, respectively. In the CAMP2Ex region, biomass burning from Borneo was a major source of non-hygroscopic particles influencing the bulk hygroscopicity in the region during the southwest monsoon. Convective particle transport abounds in the region, and for the specific cases chosen, changed the aerosol characteristics aloft, decreasing and increasing hygroscopicity with increased organic and sulfate mass fractions, respectively, based on field data. A global-scale model represented this change for a large-scale system case during CAMP2Ex, and improvements with model regionalization are desired for more local systems as part of future work. The analysis done was applied to another marine region, the northwest Atlantic Ocean, where the NASA Aerosol Cloud meTeorology Interactions oVer the western ATlantic Experiment (ACTIVATE) conducted numerous flights to study aerosol properties, and especially hygroscopicity. Seasonal aerosol characteristics, particle aging, and cloud processing affected aerosol hygroscopicity measurements in the northwest Atlantic. Non-sea salt inorganics increased hygroscopicity in the winter, while enhanced organic influence decreased hygroscopicity in the summer. These findings on aerosol hygroscopicity can help to improve the representation of aerosols in models and in the understanding of cloud formation in marine areas. 
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