Analysis of precipitation chemistry at a rural site in Hiroshima Prefecture, Japan

Chemical Composition Characteristics of Precipitation at Two Sites in Jeju Island

“…The electric conductivities and pH for a total of 442 precipitation samples were measured, and the analytical results of major ions were Table 2. [26][27][28] The H + concentration was obtained from pH measurement and the HCO 3 -concentration was calculated from the relation of [HCO 3 − ] = 10 (pH-11.3) . 29 The volume-weighted mean pH value was 4.91 and 4.83 at the 1100 Site and Jeju city, respectively, showing relatively week acidic precipitation during the period of this study.…”

Chemical composition of rainwater at Maldives Climate Observatory at Hanimaadhoo (MCOH)

“…A principal component analysis (PCA) was also applied to the data. This is a simplified representation of the data, which identifies the relationship among the variables and provides indica- tions of their source types based on the nature of factors obtained (Seto et al, 2000;Topcu et al, 2002;Semionov et al, 2003;Astel et al, 2004). In principle, PCA produces a linear combination of the variables, which explains a large fraction of the variance of the data.…”

Sector Analysis of pH Values in the Northeastern Region of Puerto Rico

“…Studies done by several authors 5,11,16 show that the use of 850-Pa wind directions should be a good approximation for the mean transport wind, because the pressure level frequently lies close to the center of the transport layer. For our purpose, we used wind in surface, because of lack of air-back trajectory to the 850-Pa level.…”

“…A number of air-mass trajectory analyses have already been conducted to determine the source-receptor relationships for wet deposition over the eastern region of the United States, [4][5][6][7] in Europe, [8][9][10][11][12] and in Asia. [13][14][15][16] The objective of this study is to understand the contribution of the airmass trajectory to the variation of the pH values of the rainfall in the northeastern region of Puerto Rico. To conduct the study, we classified the region into five sectors and analyzed the data for the last three-year period (January 1998-December 2000).…”