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aerosol meteorology of maritime continent for the 2012 7seas southwest monsoon intensive study - part 2: philippine receptor observations of fine-scale aerosol behaviorThe largest 7 Southeast Asian Studies (7SEAS) operations period within the Maritime Continent (MC) occurred in the August-September 2012 biomass burning season. Data included were observations aboard the MY Vasco, dispatched to the Palawan Archipelago and Sulu Sea of the Philippines for September 2012. At these locations, the Vasco observed MC smoke and pollution entering the southwest monsoon (SWM) monsoonal trough. Here we describe the research cruise findings and the finer-scale aerosol meteorology of this convectively active region. This 2012 cruise complemented a 2-week cruise in 2011 and was generally consistent with previous findings in terms of how smoke emission and transport related to monsoonal flows, tropical cyclones (TC), and the covariance between smoke transport events and the atmosphere's thermodynamic structure. Biomass burning plumes were usually mixed with significant amounts of anthropogenic pollution. Also key to aerosol behavior were squall lines and cold pools propagating across the South China Sea (SCS) and scavenging aerosol particles in their path. However, the 2012 cruise showed much higher modulation in aerosol frequency than its 2011 counterpart. Whereas in 2011 large synoptic-scale aerosol events transported high concentrations of smoke into the Philippines over days, in 2012 measured aerosol events exhibited a much shorter-term variation, sometimes only 312h. Strong monsoonal flow reversals were also experienced in 2012. Nucleation events in cleaner and polluted conditions, as well as in urban plumes, were observed. Perhaps most interestingly, several cases of squall lines preceding major aerosol events were observed, as opposed to 2011 observations where these lines largely scavenged aerosol particles from the marine boundary layer. Combined, these observations indicate pockets of high and low particle counts that are not uncommon in the region. These perturbations are difficult to observe by satellite and very difficult to model. Indeed, the Navy Aerosol Analysis and Prediction System (NAAPS) simulations captured longer period aerosol events quite well but largely failed to capture the timing of high-frequency phenomena. Ultimately, the research findings of these cruises demonstrate the real world challenges of satellite-based missions, significant aerosol life cycle questions such as those the future Aerosol/Clouds/Ecosystems (ACE) will investigate, and the importance of small-scale phenomena such as sea breezes, squall lines, and nucleation events embedded within SWM patterns in dominating aerosol life cycle and potential relationships to clouds.
Document ID
Document Type
Reprint (Version printed in journal)
Reid, Jeffrey S.
(Naval Research Lab. Monterey, CA, United States)
Lagrosas, Nofel D.
(Manila Observatory Philippines)
Jonsson, Haflidi H.
(Naval Research Lab. Monterey, CA, United States)
Reid, Elizabeth A.
(Naval Research Lab. Monterey, CA, United States)
Atwood, Samuel A.
(Colorado State Univ. Fort Collins, CO, United States)
Boyd, Thomas J.
(Naval Research Lab. Washington, DC, United States)
Ghate, Virendra P.
(Argonne National Lab. IL, United States)
Xian, Peng
(Naval Research Lab. Monterey, CA, United States)
Posselt, Derek J.
(Michigan Univ. Ann Arbor, MI, United States)
Simpas, James B.
(Manila Observatory Philippines)
Uy, Sherdon N.
(Manila Observatory Philippines)
Zaiger, Kimo
(Naval Engineering Services Center Port Hueneme, CA, United States)
Blake, Donald R.
(California Univ. Irvine, CA, United States)
Bucholtz, Anthony
(Naval Research Lab. Monterey, CA, United States)
Campbell, James R.
(Naval Research Lab. Monterey, CA, United States)
Chew, Boon Ning
(Meteorological Service Singapore)
Cliff, Steven S.
(California Univ. Davis, CA, United States)
Holben, Brent N.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Holz, Robert E.
(Wisconsin Univ. Madison, WI, United States)
Hyer, Edward J.
(Naval Research Lab. Monterey, CA, United States)
Kreidenweis, Sonia M.
(Colorado State Univ. Fort Collins, CO, United States)
Kuciauskas, Arunas P.
(Naval Research Lab. Monterey, CA, United States)
Lolli, Simone
(Maryland Univ. Baltimore County Baltimore, MD, United States)
Oo, Min
(Wisconsin Univ. Madison, WI, United States)
Perry, Kevin D.
(Utah Univ. Salt Lake City, UT, United States)
Date Acquired
April 7, 2017
Publication Date
November 15, 2016
Publication Information
Publication: Atmospheric Chemistry and Physics
Volume: 16
Issue: 22
ISSN: 1680-7316
Subject Category
Meteorology and Climatology
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