@article{fdi:010021341,
  title = {{A}tmospheric mercury deposition over {B}razil during the past 30,000 years},
  author = {{L}acerda, {L}.{D}. and {R}ibeiro, {M}.{G}. and {C}ordeiro, {R}.{C}. and {S}ifeddine, {A}bdelfettah and {T}urcq, {B}runo},
  editor = {},
  language = {{ENG}},
  abstract = {{A}tmospheric {H}g deposition over {B}razil is presented for the past 30,000 years as a tracer of the different natural and anthropogenic processes affecting the atmospheric environment of {B}razil. {D}uring most of the prehistoric period, atmospheric deposition rates were rather constant with an average of about 2 microg/m2/yr. {P}eak deposition, ranging from 4 to 6 microg/m2/yr, occured at least during two periods between 3,300 and 3,600 {BP} and between 8,500 to 12,000 {BP}, and during the last glacial maximum ({LGM}), at about 18,000 years {BP}. {T}hese periods were characterized by drier, colder climates with high frequency of forest fires, as shown by correlation with coal and pollen distribution data. {D}uring the colonial period {H}g atmospheric deposition rates were much higher, about four times the prehistoric background and reached 6 to 8 microg/m2/yr. {T}hese increasing {H}g deposition rates can only be explained by the large {H}g emissions in {S}outh and {C}entral {A}merica from {S}panish silver mines, which emitted to the continent's environment about 200,000 tons of {H}g from 1,580 to 1,820. {D}uring the present century, {H}g deposition rates varied according to the region of the country. {I}n the {A}mazon region, where gold mining is the major source of {H}g emission to the atmosphere, deposition rates increased continuously during the last 40 years, reaching 8 to 10 microg/m2/yr. {I}n the industrialized {S}outheast, {H}g deposition was higher during the mid 1960s and 1970s, ranging from 80 to 130 microg/m2/yr, but decreased to 20 to 30 microg/m2/yr in the 1990s, due to the enforcement of emission control policies. {H}owever, where {H}g emissions are mostly from urban, nonpoint sources, such as along the high urbanized coastal area, {H}g deposition, although smaller, increased steadily from the 1940s reaching a maximum at surface sediment layers of about 40.0 microg/m2/yr... ({D}'apr{\`e}s r{\'e}sum{\'e} d'auteur)},
  keywords = {{MERCURE} ; {POLLUTION} ; {ATMOSPHERE} ; {VARIATION} {SECULAIRE} ; {PALEOENVIRONNEMENT} ; {PALEOCLIMAT} ; {FACTEUR} {ANTHROPIQUE} ; {BRESIL} ; {AMAZONIE}},
  booktitle = {},
  journal = {{C}iencia e {C}ultura},
  volume = {51},
  numero = {5/6},
  pages = {363--371},
  ISSN = {0009-6725},
  year = {1999},
  URL = {https://www.documentation.ird.fr/hor/fdi:010021341},
}