Size resolved measurements of springtime aerosol particles over the northern South China Sea

Atwood, Samuel A.; Reid, Jeffrey S.; Kreidenweis, Sonia M.; Cliff, Steven S.; Zhao, Yongjing; Lin, Neng Huei; Tsay, Si Chee; Chu, Yu Chi; Westphal, Douglas L.

doi:10.1016/j.atmosenv.2012.11.024

Cited by 36 publications

(52 citation statements)

References 35 publications

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“…It has a strong seasonal variation, where the lowest mass concentration , respectively. The results show comparable concentrations measured from Dongsha island in northern SCS except for heavy aerosol events previously reported in that site (Atwood, 2013;. However, we expect its sources to vary from our observations based on the MODIS-derived AOT analysis of Lin et al (2007) buses and trucks that pass by the adjacent road.…”

Section: Seasonal Variation Of Pm 25contrasting

confidence: 31%

Seasonal variation and chemical characterization of PM<sub>2.5</sub> in northwestern Philippines

Bagtasa¹,

Cayetano²,

Yuan³

2017

Preprint

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Abstract. The seasonal and chemical characteristic of fine particulate matter (PM 2.5 ) was investigated in Burgos, Ilocos Norte, located at the northwestern edge of the Philippines. Each 24H-sample of fine aerosol was collected for two weeks every . Three-day wind back trajectory analysis of air mass reveals the influence 5 of the North Western Pacific monsoon regimes on PM 2.5 concentration. During southwest monsoon, sea salt is the dominant component of fine aerosols carried by moist air from the South China Sea. During northeast monsoon, on the other hand, both wind and receptor model (USEPA PMF) analysis showed that higher particulate concentration was due to the Long Range Transport (LRT) of anthropogenic emissions from the northern East Asia. Overall, sea salt and soil comprise 33% of total PM 2.5 concentration while local biomass burning makes up 33%. LRT of industrial emission, solid waste burning and 10 secondary sulfate from East Asia have a mean contribution of 34% to the total fine particulate for the whole sampling period.

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Section: Seasonal Variation Of Pm 25contrasting

confidence: 31%

Seasonal variation and chemical characterization of PM<sub>2.5</sub> in northwestern Philippines

Bagtasa¹,

Cayetano²,

Yuan³

2017

Preprint

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“…In contrast, higher u at 440 nm of~0.93 was observed at a biomassburning downwind site (Lulin, Sheu et al, 2010; Lee et al, 2011; Monthly variations of MODIS (a) fire counts and (b) AOD over Indochina and Maritime continent regions.OuYang et al, 2012) and at a site in southern SEA(Atwood et al, 2013). The wide range of u indicates various black carbon fractions of carbonaceous aerosols in different biomass-burning regions.…”

mentioning

confidence: 98%

Interactions between biomass-burning aerosols and clouds over Southeast Asia: Current status, challenges, and perspectives

Lin

Sayer

Wang

et al. 2014

Environmental Pollution

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“…The instrument used in this study was a version of the DRUM sampler originally described by Cahill et al (1985), modified to utilize slit orifices and configured to run at 16 L min −1 as described in Reid et al (2008). A similar instrument was deployed for comparison to Dongsha Island in the SCS/ES in 2011 in the winter/spring northeasterly monsoon (Atwood et al, 2013a). An unheated PM 10 sample inlet was used upstream of the impactor, followed by collection stages with nominal 50 % aerodynamic diameter-cut sizes of 5, 2.5, 1.15, 0.75, 0.56, 0.34, 0.26, and 0.07 µm.…”

Section: Aerosol and Gas Chemistrymentioning

confidence: 99%

Observations of the temporal variability in aerosol properties and their relationships to meteorology in the summer monsoonal South China Sea/East Sea: the scale-dependent role of monsoonal flows, the Madden–Julian Oscillation, tropical cyclones, squall lines and cold pools

Reid¹,

et al. 2015

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Abstract. In a joint NRL/Manila Observatory mission, as part of the Seven SouthEast Asian Studies program (7-SEAS), a 2-week, late September 2011 research cruise in the northern Palawan archipelago was undertaken to observe the nature of southwest monsoonal aerosol particles in the South China Sea/East Sea (SCS/ES) and Sulu Sea region. Previous analyses suggested this region as a receptor for biomass burning from Borneo and Sumatra for boundary layer air entering the monsoonal trough. Anthropogenic pollution and biofuel emissions are also ubiquitous, as is heavy shipping traffic. Here, we provide an overview of the regional environment during the cruise, a time series of key aerosol and meteorological parameters, and their interrelationships. Overall, this cruise provides a narrative of the processes that control regional aerosol loadings and their possible feedbacks with clouds and precipitation. While 2011 was a moderate El Niño-Southern Oscillation (ENSO) La Niña year, higher burning activity and lower precipitation was more typical of neutral conditions. The large-scale aerosol environment was modulated by the Madden-Julian Oscillation (MJO) and its associated tropical cyclone (TC) activity in a manner consistent with the conceptual analysis performedPublished by Copernicus Publications on behalf of the European Geosciences Union. J. S. Reid et al.: Temporal variability in South Chinas Sea aerosol propertiesby Reid et al. (2012). Advancement of the MJO from phase 3 to 6 with accompanying cyclogenesis during the cruise period strengthened flow patterns in the SCS/ES that modulated aerosol life cycle. TC inflow arms of significant convection sometimes span from Sumatra to Luzon, resulting in very low particle concentrations (minimum condensation nuclei CN < 150 cm −3 , non-sea-salt PM 2.5 < 1 µg m −3 ). However, elevated carbon monoxide levels were occasionally observed suggesting passage of polluted air masses whose aerosol particles had been rained out. Conversely, two drier periods occurred with higher aerosol particle concentrations originating from Borneo and Southern Sumatra (CN > 3000 cm −3 and non-sea-salt PM 2.5 10-25 µg m −3 ). These cases corresponded with two different mechanisms of convection suppression: lower free-tropospheric dry-air intrusion from the Indian Ocean, and large-scale TC-induced subsidence. Veering vertical wind shear also resulted in aerosol transport into this region being mainly in the marine boundary layer (MBL), although lower free troposphere transport was possible on the western sides of Sumatra and Borneo. At the hourly time scale, particle concentrations were observed to be modulated by integer factors through convection and associated cold pools. Geostationary satellite observations suggest that convection often takes the form of squall lines, which are bowed up to 500 km across the monsoonal flow and 50 km wide. These squall lines, initiated by cold pools from large thunderstorms and likely sustained by a veering vertical wind shear and aforementioned mid-troposphere dr...

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Size resolved measurements of springtime aerosol particles over the northern South China Sea

Cited by 36 publications

References 35 publications

Seasonal variation and chemical characterization of PM<sub>2.5</sub> in northwestern Philippines

Seasonal variation and chemical characterization of PM<sub>2.5</sub> in northwestern Philippines

Interactions between biomass-burning aerosols and clouds over Southeast Asia: Current status, challenges, and perspectives

Observations of the temporal variability in aerosol properties and their relationships to meteorology in the summer monsoonal South China Sea/East Sea: the scale-dependent role of monsoonal flows, the Madden–Julian Oscillation, tropical cyclones, squall lines and cold pools

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Size resolved measurements of springtime aerosol particles over the northern South China Sea

Cited by 36 publications

References 35 publications

Seasonal variation and chemical characterization of PM&lt;sub&gt;2.5&lt;/sub&gt; in northwestern Philippines

Seasonal variation and chemical characterization of PM&lt;sub&gt;2.5&lt;/sub&gt; in northwestern Philippines

Interactions between biomass-burning aerosols and clouds over Southeast Asia: Current status, challenges, and perspectives

Observations of the temporal variability in aerosol properties and their relationships to meteorology in the summer monsoonal South China Sea/East Sea: the scale-dependent role of monsoonal flows, the Madden–Julian Oscillation, tropical cyclones, squall lines and cold pools

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Seasonal variation and chemical characterization of PM<sub>2.5</sub> in northwestern Philippines

Seasonal variation and chemical characterization of PM<sub>2.5</sub> in northwestern Philippines