Stable isotope paleoenvironmental record of a coral from Cabo Pulmo, entrance to the Gulf of california, mexico
A 17-year-long record of δ18O and δ13C from a Cabo Pulmo coral (Pavona gigantea) was analyzed. Although the coral δ18O signal is mainly temperature controlled (~70%), the seasonal arrival of surface water masses to the Gulf of California produces an isotopic effect in the opposite direction to that...
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Iniversidad Autónoma de Baja California
2001
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oai:cienciasmarinas.com.mx:article-4692019-05-08T19:58:52Z Stable isotope paleoenvironmental record of a coral from Cabo Pulmo, entrance to the Gulf of california, mexico El registro isotópico paleoambiental de un coral de Cabo Pulmo, Boca del Golfo de California, México Bernal, GR Carriquiry, JD Gulf of California stable isotopes corals Golfo de California isótopos estables corales A 17-year-long record of δ18O and δ13C from a Cabo Pulmo coral (Pavona gigantea) was analyzed. Although the coral δ18O signal is mainly temperature controlled (~70%), the seasonal arrival of surface water masses to the Gulf of California produces an isotopic effect in the opposite direction to that produced by temperature. During summer and fall, the arrival of Equatorial water effectively reduces the annual range in the δ18O of the coral skeletons by increasing the δ18O value of water, even though this occurs during the rainy season. The incursion of Equatorial water masses to the entrance of the Gulf of California during El Niño years is so strong that even during the strongest ENSO years there is no important isotopic shift in the skeleton, even though temperature records show significant positive temperature anomaly in the region. The same effect occurs for La Niña years, but in the opposite direction. By deconvoluting the temperature signal from the isotopic record, the seasonal interplay of the water masses from the California Current and the Costa Rica Coastal Current can be effectively deduced. Changes in the coral δ13C seem to coincide with periods of upwelling events in the gulf, with the highest value coinciding with the annual maximum in pigment concentration for the region. Se analizó la señal de δ18O y δ13C en un coral (Pavona gigantea) del arrecife de Cabo Pulmo que contenía un registro esqueletal de 17 años. Aunque la señal isotópica en el esqueleto coralino está principalmente controlada por la temperatura (~70%), la llegada estacional de masas de agua al Golfo de California produce un efecto isotópico sobre el coral en dirección opuesta a la térmica. Durante el verano y otoño, la llegada de agua ecuatorial reduce el intervalo anual del δ18O del esqueleto coralino, ya que imprime una señal positiva, aun cuando se trata de la estación lluviosa en la zona. La incursión de aguas ecuatoriales durante años El Niño es tan fuerte que los años ENOA (El Niño y la Oscilación Austral) más intensos no imprimieron cambios isotópicos importantes en el esqueleto, a pesar de que los registros de temperatura muestran anomalías positivas significativas en la región. El efecto inverso ocurre para los años de La Niña. A partir de las señales térmica e isotópica fue posible deducir el intercambio de masas de agua de la Corriente de California y de la Corriente Costera de Costa Rica. Los cambios en la señal de δ13C parecen coincidir con periodos de surgencia en el golfo, siendo su valor más grande coincidente con el periodo anual de máxima concentración de pigmentos en la columna de agua. Iniversidad Autónoma de Baja California 2001-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/469 10.7773/cm.v27i2.469 Ciencias Marinas; Vol. 27 No. 2 (2001); 155-174 Ciencias Marinas; Vol. 27 Núm. 2 (2001); 155-174 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/469/407 |
| institution |
Ciencias Marinas |
| collection |
OJS |
| language |
eng |
| format |
Online |
| author |
Bernal, GR Carriquiry, JD |
| spellingShingle |
Bernal, GR Carriquiry, JD Stable isotope paleoenvironmental record of a coral from Cabo Pulmo, entrance to the Gulf of california, mexico |
| author_facet |
Bernal, GR Carriquiry, JD |
| author_sort |
Bernal, GR |
| title |
Stable isotope paleoenvironmental record of a coral from Cabo Pulmo, entrance to the Gulf of california, mexico |
| title_short |
Stable isotope paleoenvironmental record of a coral from Cabo Pulmo, entrance to the Gulf of california, mexico |
| title_full |
Stable isotope paleoenvironmental record of a coral from Cabo Pulmo, entrance to the Gulf of california, mexico |
| title_fullStr |
Stable isotope paleoenvironmental record of a coral from Cabo Pulmo, entrance to the Gulf of california, mexico |
| title_full_unstemmed |
Stable isotope paleoenvironmental record of a coral from Cabo Pulmo, entrance to the Gulf of california, mexico |
| title_sort |
stable isotope paleoenvironmental record of a coral from cabo pulmo, entrance to the gulf of california, mexico |
| description |
A 17-year-long record of δ18O and δ13C from a Cabo Pulmo coral (Pavona gigantea) was analyzed. Although the coral δ18O signal is mainly temperature controlled (~70%), the seasonal arrival of surface water masses to the Gulf of California produces an isotopic effect in the opposite direction to that produced by temperature. During summer and fall, the arrival of Equatorial water effectively reduces the annual range in the δ18O of the coral skeletons by increasing the δ18O value of water, even though this occurs during the rainy season. The incursion of Equatorial water masses to the entrance of the Gulf of California during El Niño years is so strong that even during the strongest ENSO years there is no important isotopic shift in the skeleton, even though temperature records show significant positive temperature anomaly in the region. The same effect occurs for La Niña years, but in the opposite direction. By deconvoluting the temperature signal from the isotopic record, the seasonal interplay of the water masses from the California Current and the Costa Rica Coastal Current can be effectively deduced. Changes in the coral δ13C seem to coincide with periods of upwelling events in the gulf, with the highest value coinciding with the annual maximum in pigment concentration for the region. |
| publisher |
Iniversidad Autónoma de Baja California |
| publishDate |
2001 |
| url |
https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/469 |
| _version_ |
1715723972136402944 |
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