@Article{DeusdaráFoBoMeLiOm:2017:BrCa,
author = "Deusdar{\'a}, Karinne Reis Leal and Forti, Maria Cristina and
Borma, Laura de Simone and Menezes, R. S. C. and Lima, J. R. S.
and Ometto, Jean Pierre Henry Balbaud",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Universidade Federal de
Pernambuco (UFPE)} and {Universidade Federal Rural de Pernambuco
(UFRPE)} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Rainwater chemistry and bulk atmospheric deposition in a tropical
semiarid ecosystem: the Brazilian Caatinga",
journal = "Journal of Atmospheric Chemistry",
year = "2017",
volume = "74",
number = "1",
pages = "71--85",
month = "Mar.",
keywords = "Brazil, Chemical composition, Nitrogen deposition, Rainfall,
Source contribution, South America.",
abstract = "We assessed the rainwater chemistry, the potential sources of its
main inorganic components and bulk atmospheric deposition in a
rural tropical semiarid region in the Brazilian Caatinga. Rainfall
samples were collected during two wet seasons, one during an
extremely dry year (2012) and one during a year with normal
rainfall (2013). According to measurements of the main inorganic
ions in the rainwater (H+, Na+, NH4 +, K+, Ca2+, Mg2+,
Cl\−, NO3 \−, and SO4 2\−), no differences
were observed in the total ionic charge between the two
investigated wet seasons. However, Ca2+, K+, NH4 + and NO3
\− were significant higher in the wetter year (p < 0.05)
which was attributed to anthropogenic activities, such as organic
fertilizer applications. The total ionic contents of the rainwater
suggested a dominant marine contribution, accounting for 76 % and
58 % of the rainwater in 2012 and 2013, respectively. The sum of
the non-sea-salt fractions of Cl\−, SO4 2\−, Mg2+,
Ca2+ and K+ were 19 % and 33 % in 2012 and 2013, and the
nitrogenous compounds accounted for 2.8 % and 6.0 % of the total
ionic contents in 2012 and 2013, respectively. The ionic ratios
suggested that Mg2+ was probably the main neutralizing constituent
of rainwater acidity, followed by Ca2+. We observed a low bulk
atmospheric deposition of all major rainwater ions during both wet
seasons. Regarding nitrogen deposition, we estimated slightly
lower annual inputs than previous global estimates. Our findings
contribute to the understanding of rainfall chemistry in
northeastern Brazil by providing baseline information for a
previously unstudied tropical semiarid ecosystem.",
doi = "10.1007/s10874-016-9341-9",
url = "http://dx.doi.org/10.1007/s10874-016-9341-9",
issn = "0167-7764",
language = "en",
targetfile = "deusdara_rainwater.pdf",
urlaccessdate = "03 jun. 2024"
}