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Chemical Characteristics, Size Distributions, and Aerosol Liquid Water in Size-Resolved Coastal Urban Aerosols Allied with Distinct Air Masses over Tropical Peninsular India
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2021-02-23 , DOI: 10.1021/acsearthspacechem.0c00282 Suresh Kumar Reddy Boreddy 1 , Prashant Hegde 1 , Aravindan Rema Aswini 1
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2021-02-23 , DOI: 10.1021/acsearthspacechem.0c00282 Suresh Kumar Reddy Boreddy 1 , Prashant Hegde 1 , Aravindan Rema Aswini 1
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The present study reports on carbonaceous, water-soluble inorganic and organic components in size-resolved aerosols collected under different polluted air masses over a coastal urban location (Cochin) of tropical India. Results show that a high abundance of carbonaceous, non sea-salt (nss)-SO42–, nss-K+, and NH4+ in fine mode (<2 μm) is associated with northeasterly air masses, whereas sea-salts (Na+ and Cl–), NO3–, and nss-Ca2+ were higher in coarse mode (>2.0 μm) aligned with northwesterly and southwest air masses. Organic carbon (OC) was characterized by a unimodal size distribution with a peak in fine mode during northeasterly and northwesterly air masses, whereas the peak was shifted to the coarse mode during southwest air masses. Elemental carbon (EC) showed unimodal size distribution during southwest air masses while bimodal distribution under northeasterly and northwesterly air masses with a prominent peak in fine mode was shown. NH4+, nss-SO42–, nss-K+, and water-soluble OC (WSOC) showed unimodal size distributions with a peak in fine mode, whereas NO3–, sea-salts, and dust particles showed unimodal size distributions with a peak in the coarse mode. On the basis of these results together with correlation analysis and specific mass ratios, we emphasize that northeasterly air masses are highly enriched with secondary anthropogenic aerosols whereas primary coarse mode aerosols come from various sources such as sea-salts, dust, and NOx emissions linked with northwesterly and southwest air masses. The estimated aerosol–liquid–water (ALW) revealed that sea-salts, nitrate, and dust aerosols contribute to ALW in the coarse mode, whereas NH4+, SO42–, and water-soluble organics are significantly important in fine mode aerosols.
中文翻译：
印度半岛上大小分辨的沿海城市气溶胶与不同气团结盟的化学特征，大小分布和气溶胶液态水
本研究报告了热带印度沿海城市地区（科钦）在不同污染的空气质量下收集到的大小分解的气溶胶中的碳质，水溶性无机和有机成分。结果表明，精细模式（<2μm）的碳质，非海盐（nss）-SO 4 2–，nss-K +和NH 4 +的丰度与东北气团有关，而海盐（Na +和Cl –），NO 3 –和nss-Ca 2 +在粗模式（> 2.0μm）下，与西北和西南空气质量一致，这些值更高。有机碳（OC）的特征是单峰尺寸分布，在东北和西北气团期间，精细模式下出现一个峰值，而在西南气团期间，该峰向粗模式下转变。碳元素在西南气团中表现出单峰尺寸分布，而在东北气团和西北气团下呈双峰分布，在精细模式下表现出明显的峰值。NH 4 +，NSS-SO 4 2-，NSS-K +，和水溶性OC（WSOC）显示单峰尺寸分布在精细模式中的峰值，而NO 3 -，海盐和尘埃颗粒显示出单峰尺寸分布，并在粗模式下出现峰值。根据这些结果以及相关性分析和特定的质量比，我们强调东北空气质量高度富含次级人为气溶胶，而初级粗模式气溶胶来自各种来源，例如海盐，粉尘和NO x排放。西北风和西南风。估计的气溶胶-水-水（ALW）表明，在粗模式下，海盐，硝酸盐和粉尘气溶胶对ALW起作用，而在细模式下，NH 4 +，SO 4 2–和水溶性有机物非常重要气溶胶。
更新日期：2021-03-18
中文翻译：
印度半岛上大小分辨的沿海城市气溶胶与不同气团结盟的化学特征，大小分布和气溶胶液态水
本研究报告了热带印度沿海城市地区（科钦）在不同污染的空气质量下收集到的大小分解的气溶胶中的碳质，水溶性无机和有机成分。结果表明，精细模式（<2μm）的碳质，非海盐（nss）-SO 4 2–，nss-K +和NH 4 +的丰度与东北气团有关，而海盐（Na +和Cl –），NO 3 –和nss-Ca 2 +在粗模式（> 2.0μm）下，与西北和西南空气质量一致，这些值更高。有机碳（OC）的特征是单峰尺寸分布，在东北和西北气团期间，精细模式下出现一个峰值，而在西南气团期间，该峰向粗模式下转变。碳元素在西南气团中表现出单峰尺寸分布，而在东北气团和西北气团下呈双峰分布，在精细模式下表现出明显的峰值。NH 4 +，NSS-SO 4 2-，NSS-K +，和水溶性OC（WSOC）显示单峰尺寸分布在精细模式中的峰值，而NO 3 -，海盐和尘埃颗粒显示出单峰尺寸分布，并在粗模式下出现峰值。根据这些结果以及相关性分析和特定的质量比，我们强调东北空气质量高度富含次级人为气溶胶，而初级粗模式气溶胶来自各种来源，例如海盐，粉尘和NO x排放。西北风和西南风。估计的气溶胶-水-水（ALW）表明，在粗模式下，海盐，硝酸盐和粉尘气溶胶对ALW起作用，而在细模式下，NH 4 +，SO 4 2–和水溶性有机物非常重要气溶胶。
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