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10. An Aerosol Climatology via Remote Sensing over Metro Manila, Philippines

Author

Lorenzo, Genevieve Rose, primary, Arellano, Avelino F., additional, Cambaliza, Maria Obiminda, additional, Castro, Christopher, additional, Cruz, Melliza Templonuevo, additional, Di Girolamo, Larry, additional, Gacal, Glenn Franco, additional, Hilario, Miguel Ricardo A., additional, Lagrosas, Nofel, additional, Ong, Hans Jarett, additional, Simpas, James Bernard, additional, Uy, Sherdon Niño, additional, and Sorooshian, Armin, additional

Published
2023
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11. An emerging aerosol climatology via remote sensing over Metro Manila, the Philippines.

Author

Lorenzo, Genevieve Rose, Arellano, Avelino F., Cambaliza, Maria Obiminda, Castro, Christopher, Cruz, Melliza Templonuevo, Di Girolamo, Larry, Gacal, Glenn Franco, Hilario, Miguel Ricardo A., Lagrosas, Nofel, Ong, Hans Jarett, Simpas, James Bernard, Uy, Sherdon Niño, and Sorooshian, Armin

Subjects
AEROSOLS, REMOTE sensing, CLIMATOLOGY, LIFE cycles (Biology), ORTHOGONAL functions
Abstract

Aerosol particles in Southeast Asia are challenging to characterize due to their complex life cycle within the diverse topography and weather of the region. An emerging aerosol climatology was established based on AErosol RObotic NETwork (AERONET) data (December 2009 to October 2018) for clear-sky days in Metro Manila, the Philippines. Aerosol optical depth (AOD) values were highest from August to October, partly from fine urban aerosol particles, including soot, coinciding with the burning season in insular Southeast Asia when smoke is often transported to Metro Manila during the southwest monsoon. Clustering of AERONET volume size distributions (VSDs) resulted in five aerosol particle sources based on the position and magnitude of their peaks in the VSD and the contributions of specific particle species to AOD per cluster based on MERRA-2. The clustering showed that the majority of aerosol particles above Metro Manila were from a clean marine source (58 %), which could be related to AOD values there being relatively low compared to other cities in the region. The following are the other particle sources over Metro Manila: fine polluted sources (20 %), mixed-dust sources (12 %), urban and industrial sources (5 %), and cloud processing sources (5 %). Furthermore, MERRA-2 AOD data over Southeast Asia were analyzed using empirical orthogonal functions. Along with AOD fractional compositional contributions and wind regimes, four dominant aerosol particle air masses emerged: two sulfate air masses from East Asia, an organic carbon source from Indonesia, and a sulfate source from the Philippines. Knowing the local and regional aerosol particle air masses that impact Metro Manila is useful in identifying the sources while gaining insight into how aerosol particles are affected by long-range transport and their impact on regional weather. [ABSTRACT FROM AUTHOR]

Published
2023
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12. Spatiotemporal Assessment of PM2.5 Exposure of a High-risk Occupational Group in a Southeast Asian Megacity

Author

Collado, Jarl Tynan, primary, Abalos, Jose Gabriel, additional, de los Reyes, Imee, additional, Cruz, Melliza T., additional, Leung, Gabrielle Frances, additional, Abenojar, Katrina, additional, Manalo, Carlos Rosauro, additional, Go, Bernell, additional, Chan, Christine L., additional, Gonzales, Charlotte Kendra Gotangco, additional, Simpas, James Bernard B., additional, Porio, Emma E., additional, Wong, John Q., additional, Lung, Shih-Chun Candice, additional, and Cambaliza, Maria Obiminda L., additional

Published
2023
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14. The Airborne and Satellite Investigation of Asian Air Quality (Asia-Aq): An Opportunity for International Collaboration

Author

Crawford, James H., primary, Travis, Katherine R., additional, Judd, Laura M., additional, Lefer, Barry L., additional, Dibb, Jack E., additional, Kim, Jhoon, additional, Park, Rokjin, additional, Lee, Gangwoong, additional, Chang, Limseok, additional, Simpas, James Bernard B., additional, Cambaliza, Maria Obiminda L., additional, Macatangay, Ronald C., additional, Surapipith, Vanisa, additional, Thongboonchoo, Narisara, additional, Kim Oanh, Nguyen Thi, additional, Hien, To Thi, additional, Ly, Bich Thuy, additional, Salam, Abdus, additional, Ghude, Sachin D., additional, Latif, Mohd Talib, additional, Yu, Liya E., additional, Tanimoto, Hiroshi, additional, and Kanaya, Yugo, additional

Published
2022
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15. An Aerosol Climatology via Remote Sensing over Metro Manila, Philippines.

Author

Lorenzo, Genevieve Rose, Arellano, Avelino F., Cambaliza, Maria Obiminda, Castro, Christopher, Cruz, Melliza Templonuevo, Di Girolamo, Larry, Gacal, Glenn Franco, Hilario, Miguel Ricardo A., Lagrosas6, Nofel, Ong, Hans Jarett, Simpas, James Bernard, Uy, Sherdon Niño, and Sorooshian, Armin

Abstract

Aerosol particles in Southeast Asia have a complex life cycle and consequently are challenging to characterize. The diverse topography and weather in the region complicate the situation. An aerosol climatology was established based on AERONET data (December 2009 to October 2018) for clear sky days in Metro Manila, Philippines. Aerosol optical depth (AOD) values were highest in August, coinciding with the summer southwest monsoon, due partly to fine particles from urban aerosol particles, including soot. Also, August corresponds to the burning season in Insular Southeast Asia when smoke is often transported to Metro Manila. Clustering of AERONET volume size distributions (VSD) resulted in five aerosol particle sources based on the position and magnitude of their peaks in the VSD and the contributions of specific particle species to AOD per cluster based on MERRA-2. The clustering showed that the majority of aerosol particles above Metro Manila were from a clean marine source (58%), which could be related to AOD values there being relatively smaller than in other cities in the region. The following are the other particle sources over Metro Manila: fine polluted (20%), mixed polluted (12%), urban/industrial (5%), and cloud processing (5%). Furthermore, MERRA-2 AOD data over Southeast Asia were analyzed using empirical orthogonal functions. Along with AOD fractional compositional contributions and wind regimes, four dominant aerosol particle air masses emerged: two sulfate air masses from East Asia, an organic carbon source from Indonesia, and a sulfate source from the Philippines. Knowing the local and regional aerosol particle air masses that impact Metro Manila is useful in identifying the sources while gaining insight on how aerosol particles are affected by long-range transport and their impact on regional weather. [ABSTRACT FROM AUTHOR]

Published
2023
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16. Stubborn aerosol: why particulate mass concentrations do not drop during the wet season in Metro Manila, Philippines

Author

Hilario, Miguel Ricardo A., primary, Bañaga, Paola Angela, additional, Betito, Grace, additional, Braun, Rachel A., additional, Cambaliza, Maria Obiminda, additional, Cruz, Melliza Templonuevo, additional, Lorenzo, Genevieve Rose, additional, MacDonald, Alexander B., additional, Pabroa, Preciosa Corazon, additional, Simpas, James Bernard, additional, Stahl, Connor, additional, Yee, John Robin, additional, and Sorooshian, Armin, additional

Published
2022
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17. Particulate Oxalate‐To‐Sulfate Ratio as an Aqueous Processing Marker: Similarity Across Field Campaigns and Limitations

Author

Hilario, Miguel Ricardo A., primary, Crosbie, Ewan, additional, Bañaga, Paola Angela, additional, Betito, Grace, additional, Braun, Rachel A., additional, Cambaliza, Maria Obiminda, additional, Corral, Andrea F., additional, Cruz, Melliza Templonuevo, additional, Dibb, Jack E., additional, Lorenzo, Genevieve Rose, additional, MacDonald, Alexander B., additional, Robinson, Claire E., additional, Shook, Michael A., additional, Simpas, James Bernard, additional, Stahl, Connor, additional, Winstead, Edward, additional, Ziemba, Luke D., additional, and Sorooshian, Armin, additional

Published
2021
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18. Total organic carbon and contribution from speciated organics in cloud water: Airborne data analysis from the CAMP2Ex field campaign

Author

Stahl, Connor, Crosbie, Ewan, Bañaga, Paola Angela, Betito, Grace, Braun, Rachel A., Cainglet, Zenn Marie, Cambaliza, Maria Obiminda, Cruz, Melliza Templonuevo, Dado, Julie Mae, Hilario, Miguel Ricardo A., Leung, Gabrielle Frances, MacDonald, Alexander B., Magnaye, Angela Monina, Reid, Jeffrey, Robinson, Claire, Shook, Michael A., Simpas, James Bernard, Visaga, Shane Marie, Winstead, Edward, Ziemba, Luke, and Sorooshian, Armin

Abstract

This work focuses on total organic carbon (TOC) and contributing species in cloud water over Southeast Asia using a rare airborne dataset collected during NASA’s Cloud, Aerosol and Monsoon Processes Philippines Experiment (CAMP2Ex), in which a wide variety of maritime clouds were studied, including cumulus congestus, altocumulus, altostratus, and cumulus. Knowledge of TOC levels and their contributing species is needed for improved modeling of cloud processing of organics and to understand how aerosols and gases impact and are impacted by clouds. This work relies on 159 samples collected with an Axial Cyclone Cloud water Collector at altitudes of 0.2–6.8 km that had sufficient volume for both TOC and speciated organic composition analysis. Species included monocarboxylic acids (glycolate, acetate, formate, and pyruvate), dicarboxylic acids (glutarate, adipate, succinate, maleate, and oxalate), methanesulfonate (MSA), and dimethylamine (DMA). TOC values range between 0.018–13.660 ppm C with a mean of 0.902 ppm C. The highest TOC values are observed below 2 km with a general reduction aloft. An exception is samples impacted by biomass burning for which TOC remains enhanced as high as 6.5 km (7.048 ppm C). Estimated total organic matter derived from TOC contributes a mean of 30.7 % to total measured mass (inorganics + organics). Speciated organics contribute (on carbon mass basis) an average of 30.0 % to TOC in the study region, and account for an average of 10.3 % to total measured mass. The order of the average contribution of species to TOC, in decreasing contribution of carbon mass, is as follows: acetate (14.7 ± 20.5 %), formate (5.4 ± 9.3 %), oxalate (2.8 ± 4.3 %), DMA (1.7 ± 6.3 %), succinate (1.6 ± 2.4 %), pyruvate (1.3 ± 4.5 %), glycolate (1.3 ± 3.7 %), adipate (1.0 ± 3.6 %), MSA (0.1 ± 0.1 %), glutarate (0.1 ± 0.2 %), maleate (< 0.1 ± 0.1 %). Approximately 70 % of TOC remains unaccounted for, thus highlighting the complex nature of organics in the study region; samples collected in biomass burning plumes have up to 95.6 % of unaccounted TOC mass based on the species detected. Consistent with other regions, monocarboxylic acids dominate the speciated organic mass (~75 %) and are about four times in greater abundance than dicarboxylic acids. Samples are categorized into four cases based on back-trajectory history revealing source-independent similarity between the bulk contributions of monocarboxylic and dicarboxylic acids to TOC (16.03 %–23.66 % and 3.70 %–8.75 %, respectively). Furthermore, acetate, formate, succinate, glutarate, pyruvate, oxalate, and MSA are especially enhanced during biomass burning periods, attributed to peat emissions transported from Sumatra and Borneo. Lastly, dust (Ca2+) and sea salt (Na+/Cl−) tracers exhibit strong correlations with speciated organics, thus supporting how coarse aerosol surfaces interact with these water-soluble organics.

Published
2021

19. Particulate Oxalate-to-Sulfate Ratio as an Aqueous Processing Marker: Similarity Across Field Campaigns and Limitations

Author

Hilario, Miguel Ricardo, primary, Crosbie, Ewan, additional, Bañaga, Paola Angela, additional, Betito, Grace, additional, Braun, Rachel Anne, additional, Cambaliza, Maria Obiminda, additional, Corral, Andrea F, additional, Cruz, Melliza Templonuevo, additional, Dibb, Jack E., additional, Lorenzo, Genevieve Rose, additional, MacDonald, Alexander Bruce, additional, Robinson, Claire E, additional, Shook, Michael, additional, Simpas, James Bernard, additional, Stahl, Connor, additional, Winstead, Edward L, additional, Ziemba, Luke D., additional, and Sorooshian, Armin, additional

Published
2021
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20. Total organic carbon and the contribution from speciated organics in cloud water: airborne data analysis from the CAMP&lt;sup&gt;2&lt;/sup&gt;Ex field campaign

Author

Stahl, Connor, primary, Crosbie, Ewan, additional, Bañaga, Paola Angela, additional, Betito, Grace, additional, Braun, Rachel A., additional, Cainglet, Zenn Marie, additional, Cambaliza, Maria Obiminda, additional, Cruz, Melliza Templonuevo, additional, Dado, Julie Mae, additional, Hilario, Miguel Ricardo A., additional, Leung, Gabrielle Frances, additional, MacDonald, Alexander B., additional, Magnaye, Angela Monina, additional, Reid, Jeffrey, additional, Robinson, Claire, additional, Shook, Michael A., additional, Simpas, James Bernard, additional, Visaga, Shane Marie, additional, Winstead, Edward, additional, Ziemba, Luke, additional, and Sorooshian, Armin, additional

Published
2021
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21. Particulate Oxalate-to-Sulfate Ratio as an Aqueous Processing Marker: Consistency Across Field Campaigns and Limitations

Author

Hilario, Miguel Ricardo A., primary, Crosbie, Ewan, additional, Bañaga, Paola Angela, additional, Betito, Grace, additional, Braun, Rachel Anne, additional, Cambaliza, Maria Obiminda, additional, Corral, Andrea F, additional, Cruz, Melliza Templonuevo, additional, Dibb, Jack E., additional, Lorenzo, Genevieve Rose, additional, MacDonald, Alexander Bruce, additional, Robinson, Claire E, additional, Shook, Michael, additional, Simpas, James Bernard, additional, Stahl, Connor, additional, Winstead, Edward L, additional, Ziemba, Luke D., additional, and Sorooshian, Armin, additional

Published
2021
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22. Total organic carbon and contribution from speciated organics in cloud water: Airborne data analysis from the CAMP2Ex field campaign

Author

Stahl, Connor, primary, Crosbie, Ewan, additional, Bañaga, Paola Angela, additional, Betito, Grace, additional, Braun, Rachel A., additional, Cainglet, Zenn Marie, additional, Cambaliza, Maria Obiminda, additional, Cruz, Melliza Templonuevo, additional, Dado, Julie Mae, additional, Hilario, Miguel Ricardo A., additional, Leung, Gabrielle Frances, additional, MacDonald, Alexander B., additional, Magnaye, Angela Monina, additional, Reid, Jeffrey, additional, Robinson, Claire, additional, Shook, Michael A., additional, Simpas, James Bernard, additional, Visaga, Shane Marie, additional, Winstead, Edward, additional, Ziemba, Luke, additional, and Sorooshian, Armin, additional

Published
2021
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23. Supplementary material to "Total organic carbon and contribution from speciated organics in cloud water: Airborne data analysis from the CAMP2Ex field campaign"

Author

Stahl, Connor, primary, Crosbie, Ewan, additional, Bañaga, Paola Angela, additional, Betito, Grace, additional, Braun, Rachel A., additional, Cainglet, Zenn Marie, additional, Cambaliza, Maria Obiminda, additional, Cruz, Melliza Templonuevo, additional, Dado, Julie Mae, additional, Hilario, Miguel Ricardo A., additional, Leung, Gabrielle Frances, additional, MacDonald, Alexander B., additional, Magnaye, Angela Monina, additional, Reid, Jeffrey, additional, Robinson, Claire, additional, Shook, Michael A., additional, Simpas, James Bernard, additional, Visaga, Shane Marie, additional, Winstead, Edward, additional, Ziemba, Luke, additional, and Sorooshian, Armin, additional

Published
2021
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24. Measurement report: Firework impacts on air quality in Metro Manila, Philippines, during the 2019 New Year revelry

Author

Lorenzo, Genevieve Rose, primary, Bañaga, Paola Angela, additional, Cambaliza, Maria Obiminda, additional, Cruz, Melliza Templonuevo, additional, AzadiAghdam, Mojtaba, additional, Arellano, Avelino, additional, Betito, Grace, additional, Braun, Rachel, additional, Corral, Andrea F., additional, Dadashazar, Hossein, additional, Edwards, Eva-Lou, additional, Eloranta, Edwin, additional, Holz, Robert, additional, Leung, Gabrielle, additional, Ma, Lin, additional, MacDonald, Alexander B., additional, Reid, Jeffrey S., additional, Simpas, James Bernard, additional, Stahl, Connor, additional, Visaga, Shane Marie, additional, and Sorooshian, Armin, additional

Published
2021
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25. Measurement report: Long-range transport patterns into the tropical northwest Pacific during the CAMP&lt;sup&gt;2&lt;/sup&gt;Ex aircraft campaign: chemical composition, size distributions, and the impact of convection

Author

Hilario, Miguel Ricardo A., primary, Crosbie, Ewan, additional, Shook, Michael, additional, Reid, Jeffrey S., additional, Cambaliza, Maria Obiminda L., additional, Simpas, James Bernard B., additional, Ziemba, Luke, additional, DiGangi, Joshua P., additional, Diskin, Glenn S., additional, Nguyen, Phu, additional, Turk, F. Joseph, additional, Winstead, Edward, additional, Robinson, Claire E., additional, Wang, Jian, additional, Zhang, Jiaoshi, additional, Wang, Yang, additional, Yoon, Subin, additional, Flynn, James, additional, Alvarez, Sergio L., additional, Behrangi, Ali, additional, and Sorooshian, Armin, additional

Published
2021
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26. Contrasting the size-resolved nature of particulate arsenic, cadmium, and lead among diverse regions

Author

Gonzalez, Marisa E., primary, Stahl, Connor, additional, Cruz, Melliza Templonuevo, additional, Bañaga, Paola Angela, additional, Betito, Grace, additional, Braun, Rachel A., additional, Azadi Aghdam, Mojtaba, additional, Cambaliza, Maria Obiminda, additional, Lorenzo, Genevieve Rose, additional, MacDonald, Alexander B., additional, Simpas, James Bernard, additional, Csavina, Janae, additional, Sáez, A. Eduardo, additional, Betterton, Eric, additional, and Sorooshian, Armin, additional

Published
2021
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27. Long-range transport patterns into the tropical northwest Pacific during the CAMP2Ex aircraft campaign: chemical composition, size distributions, and the impact of convection

Author

Hilario, Miguel Ricardo A., Crosbie, Ewan, Shook, Michael, Reid, Jeffrey S., Cambaliza, Maria Obiminda L., Simpas, James Bernard B., Ziemba, Luke, DiGangi, Joshua P., Diskin, Glenn S., Nguyen, Phu, Turk, Joseph, Winstead, Edward, Robinson, Claire E., Wang, Jian, Zhang, Jiaoshi, Wang, Yang, Yoon, Subin, Flynn, James, Alvarez, Sergio L., Behrangi, Ali, and Sorooshian, Armin

Abstract

The tropical Western North Pacific (TWNP) is a receptor for pollution sources throughout Asia and is highly susceptible to climate change, making it imperative to understand long-range transport in this complex aerosol-meteorological environment. Measurements from the NASA Cloud, Aerosol, and Monsoon Processes Philippines Experiment (CAMP2Ex; 24 Aug to 5 Oct 2019) and back trajectories from the National Oceanic and Atmospheric Administration Hybrid Single Particle Lagrangian Integrated Trajectory Model (HYSPLIT) were used to examine transport into the TWNP from the Maritime Continent (MC), Peninsular Southeast Asia (PSEA), East Asia (EA), and West Pacific (WP). A mid-campaign monsoon shift on 20 Sep 2019 led to distinct transport patterns between the southwest monsoon (before 20 Sep) and monsoon transition (after 20 Sep). During the southwest monsoon, long-range transport was a function of southwesterly winds and cyclones over the South China Sea. Low (high) altitude air generally came from MC (PSEA), implying distinct aerosol processing related to convection and perhaps wind shear. The monsoon transition saw transport from EA and WP, driven by Pacific northeasterly winds, continental anticyclones, and cyclones over the East China Sea. Composition of transported air differed by emission source and accumulated precipitation along trajectories (APT) as an indicator of convection. MC air was characterized by biomass burning tracers while major components of EA air pointed to Asian outflow and secondary formation. Convective scavenging of PSEA air was evidenced by considerable vertical differences between aerosol species but not trace gases, as well as notably higher APT and smaller particles than other regions. Finally, we observed a possible wet scavenging mechanism acting on MC air aloft that was not strictly linked to precipitation. These results are important for understanding the transport and processing of air masses with further implications for modeling aerosol lifecycles and guiding international policymaking on public health and climate.

Published
2020

28. Sources and characteristics of size-resolved particulate organic acids and methanesulfonate in a coastal megacity: Manila, Philippines

Author

Stahl, Connor, primary, Cruz, Melliza Templonuevo, additional, Bañaga, Paola Angela, additional, Betito, Grace, additional, Braun, Rachel A., additional, Aghdam, Mojtaba Azadi, additional, Cambaliza, Maria Obiminda, additional, Lorenzo, Genevieve Rose, additional, MacDonald, Alexander B., additional, Hilario, Miguel Ricardo A., additional, Pabroa, Preciosa Corazon, additional, Yee, John Robin, additional, Simpas, James Bernard, additional, and Sorooshian, Armin, additional

Published
2020
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29. Supplementary material to "Measurement report: Fireworks impacts on air quality in Metro Manila, Philippines during the 2019 New Year revelry"

Author

Lorenzo, Genevieve Rose, primary, Bañaga, Paola Angela, additional, Cambaliza, Maria Obiminda, additional, Cruz, Melliza Templonuevo, additional, Azadi Agdham, Mojtaba, additional, Arellano, Avelino, additional, Betito, Grace, additional, Braun, Rachel, additional, Corral, Andrea F., additional, Dadashazar, Hossein, additional, Edwards, Eva-Lou, additional, Eloranta, Edwin, additional, Holz, Robert, additional, Leung, Gabrielle, additional, Ma, Lin, additional, MacDonald, Alexander B., additional, Simpas, James Bernard, additional, Stahl, Connor, additional, Visaga, Shane Marie, additional, and Sorooshian, Armin, additional

Published
2020
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30. Measurement report: Fireworks impacts on air quality in Metro Manila, Philippines during the 2019 New Year revelry

Author

Lorenzo, Genevieve Rose, primary, Bañaga, Paola Angela, additional, Cambaliza, Maria Obiminda, additional, Cruz, Melliza Templonuevo, additional, Azadi Agdham, Mojtaba, additional, Arellano, Avelino, additional, Betito, Grace, additional, Braun, Rachel, additional, Corral, Andrea F., additional, Dadashazar, Hossein, additional, Edwards, Eva-Lou, additional, Eloranta, Edwin, additional, Holz, Robert, additional, Leung, Gabrielle, additional, Ma, Lin, additional, MacDonald, Alexander B., additional, Simpas, James Bernard, additional, Stahl, Connor, additional, Visaga, Shane Marie, additional, and Sorooshian, Armin, additional

Published
2020
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31. Supplementary material to "Long-range transport patterns into the tropical northwest Pacific during the CAMP2Ex aircraft campaign: chemical composition, size distributions, and the impact of convection"

Author

Hilario, Miguel Ricardo A., primary, Crosbie, Ewan, additional, Shook, Michael, additional, Reid, Jeffrey S., additional, Cambaliza, Maria Obiminda L., additional, Simpas, James Bernard B., additional, Ziemba, Luke, additional, DiGangi, Joshua P., additional, Diskin, Glenn S., additional, Nguyen, Phu, additional, Turk, Joseph, additional, Winstead, Edward, additional, Robinson, Claire E., additional, Wang, Jian, additional, Zhang, Jiaoshi, additional, Wang, Yang, additional, Yoon, Subin, additional, Flynn, James, additional, Alvarez, Sergio L., additional, Behrangi, Ali, additional, and Sorooshian, Armin, additional

Published
2020
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32. Long-range transport patterns into the tropical northwest Pacific during the CAMP2Ex aircraft campaign: chemical composition, size distributions, and the impact of convection

Author

Hilario, Miguel Ricardo A., primary, Crosbie, Ewan, additional, Shook, Michael, additional, Reid, Jeffrey S., additional, Cambaliza, Maria Obiminda L., additional, Simpas, James Bernard B., additional, Ziemba, Luke, additional, DiGangi, Joshua P., additional, Diskin, Glenn S., additional, Nguyen, Phu, additional, Turk, Joseph, additional, Winstead, Edward, additional, Robinson, Claire E., additional, Wang, Jian, additional, Zhang, Jiaoshi, additional, Wang, Yang, additional, Yoon, Subin, additional, Flynn, James, additional, Alvarez, Sergio L., additional, Behrangi, Ali, additional, and Sorooshian, Armin, additional

Published
2020
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33. Supplementary material to &quot;Sources and characteristics of size-resolved particulate organic acids and methanesulfonate in a coastal megacity: Manila, Philippines&quot;

Author

Stahl, Connor, primary, Cruz, Melliza Templonuevo, additional, Bañaga, Paola Angela, additional, Betito, Grace, additional, Braun, Rachel A., additional, Aghdam, Mojtaba Azadi, additional, Cambaliza, Maria Obiminda, additional, Lorenzo, Genevieve Rose, additional, MacDonald, Alexander B., additional, Hilario, Miguel Ricardo A., additional, Pabroa, Preciosa Corazon, additional, Yee, John Robin, additional, Simpas, James Bernard, additional, and Sorooshian, Armin, additional

Published
2020
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34. Characterizing Weekly Cycles of Particulate Matter in a Coastal Megacity: The Importance of a Seasonal, Size‐Resolved, and Chemically Speciated Analysis

Author

Hilario, Miguel Ricardo A., primary, Cruz, Melliza Templonuevo, additional, Bañaga, Paola Angela, additional, Betito, Grace, additional, Braun, Rachel A., additional, Stahl, Connor, additional, Cambaliza, Maria Obiminda, additional, Lorenzo, Genevieve Rose, additional, MacDonald, Alexander B., additional, AzadiAghdam, Mojtaba, additional, Pabroa, Preciosa Corazon, additional, Yee, John Robin, additional, Simpas, James Bernard, additional, and Sorooshian, Armin, additional

Published
2020
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35. Long-range aerosol transport and impacts on size-resolved aerosol composition in Metro Manila, Philippines

Author

Braun, Rachel A., primary, Aghdam, Mojtaba Azadi, additional, Bañaga, Paola Angela, additional, Betito, Grace, additional, Cambaliza, Maria Obiminda, additional, Cruz, Melliza Templonuevo, additional, Lorenzo, Genevieve Rose, additional, MacDonald, Alexander B., additional, Simpas, James Bernard, additional, Stahl, Connor, additional, and Sorooshian, Armin, additional

Published
2020
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36. Long-Range Transport Mechanisms in East and Southeast Asia and Impacts on Size-Resolved Aerosol Composition: Contrasting High and Low Aerosol Loading Events

Author

Braun, Rachel A., primary, Aghdam, Mojtaba Azadi, additional, Bañaga, Paola Angela, additional, Betito, Grace, additional, Cambaliza, Maria Obiminda, additional, Cruz, Melliza Templonuevo, additional, Lorenzo, Genevieve Rose, additional, MacDonald, Alexander B., additional, Simpas, James Bernard, additional, Stahl, Connor, additional, and Sorooshian, Armin, additional

Published
2019
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37. Supplementary material to "Long-Range Transport Mechanisms in East and Southeast Asia and Impacts on Size-Resolved Aerosol Composition: Contrasting High and Low Aerosol Loading Events"

Author

Braun, Rachel A., primary, Aghdam, Mojtaba Azadi, additional, Bañaga, Paola Angela, additional, Betito, Grace, additional, Cambaliza, Maria Obiminda, additional, Cruz, Melliza Templonuevo, additional, Lorenzo, Genevieve Rose, additional, MacDonald, Alexander B., additional, Simpas, James Bernard, additional, Stahl, Connor, additional, and Sorooshian, Armin, additional

Published
2019
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38. Size-resolved composition and morphology of particulate matter during the southwest monsoon in Metro Manila, Philippines

Author

Cruz, Melliza Templonuevo, primary, Bañaga, Paola Angela, additional, Betito, Grace, additional, Braun, Rachel A., additional, Stahl, Connor, additional, Aghdam, Mojtaba Azadi, additional, Cambaliza, Maria Obiminda, additional, Dadashazar, Hossein, additional, Hilario, Miguel Ricardo, additional, Lorenzo, Genevieve Rose, additional, Ma, Lin, additional, MacDonald, Alexander B., additional, Pabroa, Preciosa Corazon, additional, Yee, John Robin, additional, Simpas, James Bernard, additional, and Sorooshian, Armin, additional

Published
2019
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39. Supplementary material to &quot;Size-resolved Composition and Morphology of Particulate Matter During the Southwest Monsoon in Metro Manila, Philippines&quot;

Author

Cruz, Melliza Templonuevo, primary, Bañaga, Paola Angela, additional, Betito, Grace, additional, Braun, Rachel A., additional, Stahl, Connor, additional, Aghdam, Mojtaba Azadi, additional, Cambaliza, Maria Obiminda, additional, Dadashazar, Hossein, additional, Hilario, Miguel Ricardo, additional, Lorenzo, Genevieve Rose, additional, Ma, Lin, additional, MacDonald, Alexander B., additional, Pabroa, Preciosa Corazon, additional, Yee, John Robin, additional, Simpas, James Bernard, additional, and Sorooshian, Armin, additional

Published
2019
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40. Measurement report: Fireworks impacts on air quality in Metro Manila, Philippines during the 2019 New Year revelry.

Author

Lorenzo, Genevieve Rose, Bañaga, Paola Angela, Cambaliza, Maria Obiminda, Templonuevo Cruz, Melliza, Agdham, Mojtaba Azadi, Arellano, Avelino, Betito, Grace, Braun, Rachel, Corral, Andrea F., Dadashazar, Hossein, Edwards, Eva-Lou, Eloranta, Edwin, Holz, Robert, Leung, Gabrielle, Lin Ma, MacDonald, Alexander B., Simpas, James Bernard, Stahl, Connor, Visaga, Shane Marie, and Sorooshian, Armin

Abstract

Fireworks degrade air quality, reduce visibility, alter atmospheric chemistry, and cause short-term adverse health effects. However, there have not been any comprehensive physicochemical and optical measurements of fireworks and their associated impacts in a Southeast Asia megacity, where fireworks are a regular part of the culture. Size-resolved particulate matter (PM) measurements were made before, during, and after New Year 2019 at the Manila Observatory in Quezon City, Philippines, as part of the Cloud, Aerosol, and Monsoon Processes Philippines Experiment (CAMP²Ex). A High Spectral Resolution Lidar (HSRL) recorded a substantial increase in backscattered signal associated with high aerosol loading ~440 m above the surface during the peak of firework activities around 00:00 (local time). This was accompanied by PM2.5 concentrations peaking at 383.9 μg m-3. During the firework event, water-soluble ions and elements, which affect particle formation, growth, and fate, were mostly in the submicrometer diameter range. Total (> 0.056 μm) water-soluble bulk particle mass concentrations were enriched by 5.7 times during the fireworks relative to the background (i.e., average of before and after the firework). The water-soluble mass fraction of PM2.5 increased by 18.5 (above that of background values. Bulk particle hygroscopicity, kappa (κ), increased from 0.11 (background) to 0.18 (fireworks). Potassium and non-sea salt (nss) SO42- contributed the most (70. 9%) to the water-soluble mass, with their mass size distributions shifting from a smaller to a larger submicrometer mode during the firework event. On the other hand, mass size distributions for NO3-, Cl-, and Mg2+ (21.1% mass contribution) shifted from a supermicrometer mode to a submicrometer mode. Being both uninfluenced by secondary aerosol formation and constituents of firework materials, a subset of species were identified as the best firework tracer species (Cu, Ba, Sr, K+, Al, and Pb). Although these species (excluding K+) only contributed 2.1% of the total mass concentration of water-soluble ions and elements, they exhibited the highest enrichments (6.1 to 65.2) during the fireworks. Surface microscopy analysis confirmed the presence of potassium/chloride-rich cubic particles along with capsule-shaped particles in firework samples. The results of this study highlight how firework emissions change the physicochemical and optical properties of water-soluble particles (e.g., mass size distribution, composition, hygroscopicity, and aerosol backscatter), which subsequently alters the background aerosol's respirability, influence on surroundings, ability to uptake gases, and viability as cloud condensation nuclei (CCN). [ABSTRACT FROM AUTHOR]

Published
2020
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41. Spatial Characterization of Black Carbon Mass Concentration in the Atmosphere of a Southeast Asian Megacity: An Air Quality Case Study for Metro Manila, Philippines

Author

Alas, Honey Dawn, primary, Müller, Thomas, additional, Birmili, Wolfram, additional, Kecorius, Simonas, additional, Cambaliza, Maria Obiminda, additional, Simpas, James Bernard B., additional, Cayetano, Mylene, additional, Weinhold, Kay, additional, Vallar, Edgar, additional, Galvez, Maria Cecilia, additional, and Wiedensohler, Alfred, additional

Published
2018
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42. Long-Range Transport Mechanisms in East and Southeast Asia and Impacts on Size-Resolved Aerosol Composition: Contrasting High and Low Aerosol Loading Events.

Author

Braun, Rachel A., Aghdam, Mojtaba Azadi, Bañaga, Paola Angela, Betito, Grace, Cambaliza, Maria Obiminda, Cruz, Melliza Templonuevo, Lorenzo, Genevieve Rose, MacDonald, Alexander B., Simpas, James Bernard, Stahl, Connor, and Sorooshian, Armin

Abstract

This study analyzes mechanisms of long-range transport of aerosol and aerosol chemical characteristics in and around East and Southeast Asia. Ground-based size-resolved aerosol measurements collected at the Manila Observatory in Metro Manila, Philippines from July-October 2018 were used to identify and contrast high and low aerosol loading events. Multiple data sources, including models, remote-sensing, and in situ measurements, are used to analyze the impacts of long-range aerosol transport on Metro Manila and the conditions at the local and synoptic scales facilitating this transport. Evidence of long-range transport of biomass burning aerosol from the Maritime Continent was identified through model results and the presence of biomass burning tracers (e.g. K, Rb) in the ground-based measurements. The impacts of emissions transported from continental East Asia are also identified; for one of the events analyzed, this transport was facilitated by the nearby passage of a typhoon. Changes in the aerosol size distributions, water-soluble chemical composition, and contributions of various organic aerosol species to the total water-soluble organic aerosol were examined for the different cases. The events impacted by biomass burning transport had the overall highest concentration of water-soluble organic acids, while the events impacted by long-range transport from continental East Asia, showed high percent contributions from shorter chain dicarboxylic acids (i.e. oxalate) that are often representative of photochemical and aqueous processing in the atmosphere. The low aerosol loading event was subject to a larger precipitation accumulation than the high aerosol events, indicative of wet scavenging as an aerosol sink in the study region. This low aerosol event was characterized by a larger relative contribution from supermicrometer aerosols and had a higher percent contribution from longer-chain dicarboxylic acids (i.e. maleate) to the water-soluble organic aerosol fraction. Results of this study have implications for better understanding of the transport and chemical characteristics of aerosol in a highly-populated region that has thus far been difficult to measure through remote-sensing methods. Furthermore, findings associated with the effects of air mass mixing on aerosol physiochemical properties are applicable to other global regions impacted by both natural and anthropogenic sources. [ABSTRACT FROM AUTHOR]

Published
2019
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