Your browser doesn't support javascript.
loading
The potential for carbon dioxide removal by enhanced rock weathering in the tropics: An evaluation of Costa Rica.
Ryan, P C; Santis, A; Vanderkloot, E; Bhatti, M; Caddle, S; Ellis, M; Grimes, A; Silverman, S; Soderstrom, E; Stone, C; Takoudes, A; Tulay, P; Wright, S.
Afiliação
  • Ryan PC; Department of Earth and Climate Sciences, Middlebury College, 276 Bicentennial Way, Middlebury, VT 05753, USA. Electronic address: pryan@middlebury.edu.
  • Santis A; Department of Earth and Climate Sciences, Middlebury College, 276 Bicentennial Way, Middlebury, VT 05753, USA.
  • Vanderkloot E; Department of Earth and Climate Sciences, Middlebury College, 276 Bicentennial Way, Middlebury, VT 05753, USA.
  • Bhatti M; Department of Earth and Climate Sciences, Middlebury College, 276 Bicentennial Way, Middlebury, VT 05753, USA.
  • Caddle S; Department of Earth and Climate Sciences, Middlebury College, 276 Bicentennial Way, Middlebury, VT 05753, USA.
  • Ellis M; Department of Earth and Climate Sciences, Middlebury College, 276 Bicentennial Way, Middlebury, VT 05753, USA.
  • Grimes A; Department of Earth and Climate Sciences, Middlebury College, 276 Bicentennial Way, Middlebury, VT 05753, USA.
  • Silverman S; Department of Earth and Climate Sciences, Middlebury College, 276 Bicentennial Way, Middlebury, VT 05753, USA.
  • Soderstrom E; Department of Earth and Climate Sciences, Middlebury College, 276 Bicentennial Way, Middlebury, VT 05753, USA.
  • Stone C; Department of Earth and Climate Sciences, Middlebury College, 276 Bicentennial Way, Middlebury, VT 05753, USA.
  • Takoudes A; Department of Earth and Climate Sciences, Middlebury College, 276 Bicentennial Way, Middlebury, VT 05753, USA.
  • Tulay P; Department of Earth and Climate Sciences, Middlebury College, 276 Bicentennial Way, Middlebury, VT 05753, USA.
  • Wright S; Department of Earth and Climate Sciences, Middlebury College, 276 Bicentennial Way, Middlebury, VT 05753, USA.
Sci Total Environ ; 927: 172053, 2024 Jun 01.
Article em En | MEDLINE | ID: mdl-38556010
ABSTRACT
Tropical environments show great potential to sequester CO2 by enhanced rock weathering (ERW) of powdered mafic rocks applied to agricultural fields. This study seeks to assess carbon dioxide reduction (CDR) potential in the humid tropics (1) by experimental weathering of mafic rock powders in conditions simulating humid tropical soils, and (2) from weathering rates determined from a Holocene tropical soil chronosequence where parent material is andesitic sediments. Experimentally determined weathering rates by leaching of basaltic andesites from Costa Rica (Arenal and Barva) for 50 t ha-1 applications indicate potential sequestration of 2.4 to 4.5 t CO2 ha-1 yr-1, whereas the USGS basalt standard BHVO-1 yields a rate of 11.9 t ha-1 yr-1 (influenced by more mafic composition and finer particle size). The chronosequence indicates a rate of 1.7 t CO2 ha-1 yr-1. The weathering experiment consisted of 0.6 mm of powdered rock applied atop 12 mm of Ultisol at 35 °C. To simulate a tropical soil solution, 100-mL aliquots of a dilute solution of oxalic acid in carbonated DI water were rained onto soils over a 14-day period to simulate soil moisture in the humid tropics. Solutions were collected and analyzed by ICPMS for concentrations of leached cations. A potential ERW scenario for Costa Rica was assessed assuming that one-half of lowland agricultural kaolinitic soils (mainly Ultisols, common crop and pasture soils, excluding protected areas) were to receive 50 t ha-1 of annual or biennial applications of powdered mafic rock. With an experimentally determined humid tropical CDR rate for basaltic andesite (3.5 t ha-1 yr-1) and allowances for carbon costs (e.g. emissions from processing and delivery) that reduce CDR to a net 3.2 t ha-1 yr-1, potential annual CDR of this tropical nation is ∼2-4 million tons, amounting to ∼25-50 % of annual CO2 emissions (mainly from transportation in Costa Rica).
Palavras-chave
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE País/Região como assunto: America central / Costa rica Idioma: En Revista: Sci Total Environ Ano de publicação: 2024 Tipo de documento: Article País de publicação: Holanda
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE País/Região como assunto: America central / Costa rica Idioma: En Revista: Sci Total Environ Ano de publicação: 2024 Tipo de documento: Article País de publicação: Holanda