Arid
DOI10.4209/aaqr.2015.05.0320
Impact of Long-Range Transported African Dust on Cloud Water Chemistry at a Tropical Montane Cloud Forest in Northeastern Puerto Rico
Valle-Diaz, Carlos J.1,2; Torres-Delgado, Elvis1; Colon-Santos, Stephanie M.2; Lee, Taehyoung3; Collett, Jeffrey L., Jr.4; McDowell, William H.5; Mayol-Bracero, Olga L.1
通讯作者Mayol-Bracero, Olga L.
会议名称2nd Atmospheric Chemistry and Physics at Mountain Sites Symposium
会议日期AUG 11-15, 2014
会议地点Steamboat Springs, CO
英文摘要

Bulk and drop size fractionated cloud water was collected at a Caribbean tropical montane cloud forest (TMCF) in northeastern Puerto Rico in the summer months of 2010-2012 and winter months of 2011 as part of the Puerto Rico African Dust and Cloud Study (PRADACS). We studied how cloud water chemistry in a Caribbean TMCF was affected by long-range transported African dust (LRTAD). Using HYSPLIT trajectories and enrichment factor analysis, the air masses influencing clouds at Pico del Este were identified as dust, marine, and dust with anthropogenic influence. Samples were analyzed for pH, conductivity, water-soluble ions, and metals. Na+ and Cl-comprised the main water-soluble ions (6080%) suggesting a strong marine influence. A 0.1-10% contribution of anthropogenic (nss-SO42-) and 0.2-13% contribution of mineral dust (nss-Ca2+) sources to the cloud chemical composition was observed. Primary aerosols (i.e., mineral dust and sea-salt) were enriched in large cloud water droplets (LCWD) and secondary aerosols (i.e., anthropogenic particles) were enriched in small cloud water droplets (SCWD). As a result, pH was found to be higher in LCWD due to the neutralizing capacity of nss-Ca2+ and lower in SCWD due to the presence of acidifying species (nss-SO42-, NO3-, and organic acids). Fe and Al, indicators for mineral dust were similarly distributed across the cloud droplet size spectrum. Our results show that LRTAD events modulate bulk and size-fractionated cloud water chemistry, potentially influencing cloud microphysical properties and processes.


英文关键词Sahara desert Desert dust Rainforest Cloud processing
来源出版物AEROSOL AND AIR QUALITY RESEARCH
ISSN1680-8584
EISSN2071-1409
出版年2016
卷号16
期号3
页码653-664
出版者TAIWAN ASSOC AEROSOL RES-TAAR
类型Article;Proceedings Paper
语种英语
国家USA;South Korea
收录类别SCI-E ; CPCI-S
WOS记录号WOS:000371498900016
WOS关键词CLIMATE-CHANGE ; MINERAL DUST ; CHEMICAL-COMPOSITION ; PRECIPITATION ; AEROSOLS ; RAIN
WOS类目Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
资源类型会议论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/305052
作者单位1.Univ Puerto Rico, Dept Environm Sci, San Juan, PR 00936 USA;
2.Univ Puerto Rico, Dept Chem, San Juan, PR 00936 USA;
3.Hankuk Univ Foreign Studies, Dept Environm Sci, Seoul, South Korea;
4.Colorado State Univ, Dept Atmospher Sci, Ft Collins, CO 80523 USA;
5.Univ New Hampshire, Dept Nat Resources & Environm, Durham, NH 03824 USA
推荐引用方式
GB/T 7714
Valle-Diaz, Carlos J.,Torres-Delgado, Elvis,Colon-Santos, Stephanie M.,et al. Impact of Long-Range Transported African Dust on Cloud Water Chemistry at a Tropical Montane Cloud Forest in Northeastern Puerto Rico[C]:TAIWAN ASSOC AEROSOL RES-TAAR,2016:653-664.
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