Impacts of regional wind circulations on aerosol pollution and planetary boundary layer structure in Metro Manila, Philippines

被引:8
作者
Cruz, Melliza Templonuevo [1 ,2 ]
Simpas, James Bernard [2 ,3 ]
Sorooshian, Armin [4 ,5 ]
Betito, Grace [2 ]
Cambaliza, Maria Obiminda L. [2 ,3 ]
Collado, Jarl Tynan [2 ]
Eloranta, Edwin W. [6 ]
Holz, Robert [6 ]
Topacio, Xzann Garry Vincent [2 ]
Del Socorro, Jundy [7 ]
Bagtasa, Gerry [1 ]
机构
[1] Univ Philippines, Inst Environm Sci & Meteorol, Quezon City 1101, Philippines
[2] Manila Observ, Quezon City 1108, Philippines
[3] Ateneo Manila Univ, Sch Sci & Engn, Dept Phys, Quezon City 1108, Philippines
[4] Univ Arizona, Dept Chem & Environm Engn, Tucson, AZ USA
[5] Univ Arizona, Dept Hydrol & Atmospher Sci, Tucson, AZ USA
[6] Univ Wisconsin Madison, Space Sci & Engn Ctr, Madison, WI 53706 USA
[7] Dept Environm & Nat Resources, Environm Management Bur, Visayas Ave, Quezon City 1116, Philippines
关键词
Aerosols; Boundary layer; Horizontal wind shear; SPECTRAL-RESOLUTION LIDAR; SURFACE; HEIGHT; METHODOLOGY; MONSOON;
D O I
10.1016/j.atmosenv.2022.119455
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Fine particulate matter (PM2.5) concentrations in Metro Manila, Philippines have consistently exceeded the guideline values set by the World Health Organization (WHO). Although there has been much progress in un-derstanding the components and sources of PM2.5, limited research has been done on the influence of meteo-rological factors. In particular, the influence of the planetary boundary layer height (PBLH) on PM2.5 concentration has not been studied due to inadequate observations. From January 2019-June 2020, measure-ments from a High Spectral Resolution Lidar (HSRL) filled this gap and allowed for PBLH estimation and aerosol typing. This paper investigates the roles of PBLH and regional and local wind circulations on the temporal evolution of aerosol pollution. Results show that daytime and nighttime PBLH variability is associated with solar heating and radiative cooling, respectively. Cloud-free conditions during the dry season yield a higher PBL growth rate than during the wet season when lower daytime and elevated nighttime PBLH are observed. Lower PM2.5 levels are generally observed during daytime when PBLH is at its maximum. However, the PBLH has a significant inverse correlation with PM2.5 only in the months of December-January-February. We find that horizontal directional wind shear between synoptic and mesoscale circulations confounds the PM2.5 -PBLH relationship by creating stagnant conditions conducive to aerosol accumulation. The lower 20% of PM2.5 con-centrations occur during the prevalence of strong monsoon winds. On the other hand, the upper 80% are found during the occurrence of compound mesoscale winds (i.e., sea/land/lake/valley/mountain breezes and chan-neling monsoon winds). In addition, mountain breeze is found to be associated with lifting of aerosols, resulting in multi-layering within the PBL. The findings in the present study emphasize the role of complex topography and mesoscale scale winds arising from the landscape on aerosol pollution variability.
引用
收藏
页数:16
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