Examining the utility of coral Ba/Ca as a proxy for river discharge and hydroclimate variability at Coiba Island, Gulf of Chirquí, Panamá.
Mar Pollut Bull
; 118(1-2): 48-56, 2017 May 15.
Article
em En
| MEDLINE
| ID: mdl-28215613
Panamá's extreme hydroclimate seasonality is driven by Intertropical Convergence Zone rainfall and resulting runoff. River discharge (Q) carries terrestrially-derived barium to coastal waters that can be recorded in coral. We present a Ba/Ca record (1996-1917) generated from a Porites coral colony in the Gulf of Chiriquí near Coiba Island (Panamá) to understand regional hydroclimate. Here coral Ba/Ca is correlated to instrumental Q (R=0.67, p<0.001), producing a seasonally-resolved Reduced Major Axis regression of Ba/Ca (µmol/mol)=Q (m3/s)×0.006±0.001 (µmol/mol)(m3/s)-1+4.579±0.151. Our results support work in the neighboring Gulf of Panamá that determined seawater Ba/Ca, controlled by Q, is correlated to coral Ba/Ca (LaVigne et al., 2016). Additionally, the Coiba coral Ba/Ca records at least 5 El Niño events and identified 22 of the 37 wet seasons with below average precipitation. These data corroborate the Q proxy and provide insight into the use of coral Ba/Ca as an El Niño and drought indicator.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Bário
/
Monitoramento Ambiental
/
Cálcio
/
Antozoários
Tipo de estudo:
Prognostic_studies
Limite:
Animals
País/Região como assunto:
America central
/
Panama
Idioma:
En
Revista:
Mar Pollut Bull
Ano de publicação:
2017
Tipo de documento:
Article
País de publicação:
Reino Unido