Factor analysis of trends in Texas acidic deposition |
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| Institution: | 1. Department of Mathematics (RLM 8.100), The University of Texas at Austin, Austin, TX 78712, U.S.A.;3. College of Business Administration (CBA 5.202), The University of Texas at Austin, Austin, TX 78712, U.S.A.;2. Texas Air Control Board, 6330 Highway 290 East, Austin, TX 78723, U.S.A.;1. Institute of Highway Engineering, RWTH Aachen University, Aachen, Germany;2. Intelligent Transportation System Research Center, Southeast University, PR China;3. Institute for Urban and Pavement Engineering, TU Dresden, Dresden, Germany;4. School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin, PR China;1. Department of Epidemiology, Human Genetics and Environmental Sciences, The University of Texas Health Science Center at Houston School of Public Health, Houston, TX 77030, USA;2. Environmental Defense Fund, 301 Congress Avenue, Austin, TX 78701, USA;3. Southwest Center for Occupational and Environmental Health, The University of Texas Health Science Center at Houston School of Public Health, Houston, TX 77030, USA;1. Department of Chemistry, University of Bari Aldo Moro, Via E. Orabona 4, 70126 Bari, Italy;2. Jaber Innovation srl, via Calcutta 8, 00100 Rome, Italy;3. Department of Clinical and Molecular Sciences, Università Politecnica delle Marche, Via Tronto 10/a, 60020 Ancona, Italy;4. Department of Veterinary Medicine, University of Bari Aldo Moro, Str. Prov. per Casamassima Km 3, ValenzanoBari, Italy;5. Synchimia srl, Spin-off of University of Bari Aldo-Moro, Via Orabona, 4, 70126 Bari, Italy;6. CNR-ICCOM Bari, Via Orabona, 4, 70126 Bari, Italy;1. Institute of Environment and Ecology, School of the Environment and Safety Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013, Jiangsu Province, PR China;2. Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou University of Science and Technology Suzhou, 215009, Jiangsu Province, PR China;3. State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, Zhejiang Province, PR China;4. Department of Pharmacology, Lahore Pharmacy College, Lahore, Pakistan;5. Department of Soil Science, Faculty of Agricultural Sciences and Technology, Bahauddin Zakariya University, Multan, Pakistan;6. Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, School of Agricultural Engineering Jiangsu University, 301 Xuefu Road, Zhenjiang, 212013, Jiangsu Province, PR China |
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| Abstract: | Precipitation chemistry data collected between 1980 and 1987 for 11 NADP/NTN sites in Texas have been analyzed using factor analysis and a trend analysis of monthly averages. Factor analysis identified four major factors which differed significantly from site to site: (1) a Gulf factor of Na+, Cl-, and Mg2+; (a) a soil factor of Ca2+, K+, Na+, and Mg2+; (3) an acid factor of H+, NO−3, and SO44−; and (4) an aged aerosol factor of NO3−, SO42−, and NH4+. At Longview, the acid and Gulf factors accounted for 18 and 46%, respectively, of the variation of the data. A trend analysis was performed on the logarithm of the monthly averages at the Longview and Victoria sites, the two sites with the largest and most complete data. Results suggest that hydrogen ions have been increasing at both sites, while calcium ions have been decreasing. |
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