Characterizinig Precipitation Chemistry in Changhua, Central Taiwan Using Weather Conditions And Multivariate Analysis

ISSN： 0049-6979

Source： Water, Air, and Soil Pollution, Vol.165, Iss.1-4, 2005-07, pp. : 61-75

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Abstract

Few studies of atmospheric deposition come from the fast growing region of Southeast Asia. Precipitation in Changhua City in central Taiwan was collected to examine its chemical composition and relationship with meteorological patterns. Fifty percent of the precipitation measurements had pH<5.0. deposition="" fluxes="" of="" most="" ions="" were="" comparable="" to="" that="" reported="" for="" heavily="" industrialized="" temperate="" regions.="" storms="" associated="" with="" air="" masses="" which="" originated="" in="" china="" had="" higher="" ion="" concentrations="" than="" other="" storms,="" suggesting="" substantial="" contribution="" of="" long-range="" transport.="" two="" factors,="" a="" sea="" salt="" factor="" and="" an="" anthropogenic="" factor,="" explained="" more="" than="" 70%="" of="" the="" variation="" in="" precipitation="" chemistry.="" a="" third="" factor="" had="" a="" high="" loading="" only="" on="">⁺, suggesting that pH of precipitation in Changhua City was not dominated only by acidic or basic ions alone. Instead it is determined by all components. The influences of soil and dust, as indicated by high loading on Ca²⁺ and K⁺, cannot be recognized without sea salt correction.