Calibration of Sr/Ca and Mg/Ca paleothermometers in coral Porites sp. from San Benedicto Island, Revillagigedo Archipelago, Mexico

Calibration of Sr/Ca and Mg/Ca paleothermometers in coral Porites sp. from San Benedicto Island, Revillagigedo Archipelago, Mexico

A better understanding of the global climate system depends on our ability to expand the limited instrumental records of sea surface temperature (SST) of tropical regions. The Sr/Ca and Mg/Ca ratios contained in the growth bands of corals have proved to be an accurate tool to reconstruct SST variabi...

Mô tả đầy đủ

Đã lưu trong:
Chi tiết về thư mục
Những tác giả chính: Villaescusa, JA, Carriquiry, JD
Định dạng: Online
Ngôn ngữ:eng
Được phát hành: Iniversidad Autónoma de Baja California 2004
Truy cập trực tuyến:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/339
Các nhãn: Thêm thẻ
Không có thẻ, Là người đầu tiên thẻ bản ghi này!
id oai:cienciasmarinas.com.mx:article-339
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Villaescusa, JA
Carriquiry, JD
spellingShingle Villaescusa, JA
Carriquiry, JD
Calibration of Sr/Ca and Mg/Ca paleothermometers in coral Porites sp. from San Benedicto Island, Revillagigedo Archipelago, Mexico
author_facet Villaescusa, JA
Carriquiry, JD
author_sort Villaescusa, JA
title Calibration of Sr/Ca and Mg/Ca paleothermometers in coral Porites sp. from San Benedicto Island, Revillagigedo Archipelago, Mexico
title_short Calibration of Sr/Ca and Mg/Ca paleothermometers in coral Porites sp. from San Benedicto Island, Revillagigedo Archipelago, Mexico
title_full Calibration of Sr/Ca and Mg/Ca paleothermometers in coral Porites sp. from San Benedicto Island, Revillagigedo Archipelago, Mexico
title_fullStr Calibration of Sr/Ca and Mg/Ca paleothermometers in coral Porites sp. from San Benedicto Island, Revillagigedo Archipelago, Mexico
title_full_unstemmed Calibration of Sr/Ca and Mg/Ca paleothermometers in coral Porites sp. from San Benedicto Island, Revillagigedo Archipelago, Mexico
title_sort calibration of sr/ca and mg/ca paleothermometers in coral porites sp. from san benedicto island, revillagigedo archipelago, mexico
description A better understanding of the global climate system depends on our ability to expand the limited instrumental records of sea surface temperature (SST) of tropical regions. The Sr/Ca and Mg/Ca ratios contained in the growth bands of corals have proved to be an accurate tool to reconstruct SST variability. In this study we show the calibration obtained from the seasonal geochemical measurement of the Sr/Ca and Mg/Ca molar ratios in the skeleton of coral of the genus Porites from San Benedicto Island, in the Revillagigedo Archipelago, and SST. The geochemical ratios measured (precision ±0.2%, 2σ) showed a high seasonal covariation closely related to the region's SST. The calibration equation calculated for the Sr/Ca–SST relation (n = 52) was Sr/Ca (mmol mol–1) = 10.467 (±0.067) – 0.0524 (±0.003) × SST (r2 = 0.894), and for the Mg/Ca?SST relation it was Mg/Ca (mmol mol–1) = 1.550 (±0.095) + 0.0956 (±0.0043) × STT (r2 = 0.906). When comparing the SST time series reconstructed from the Sr/Ca and Mg/Ca ratios with the mean SST of a spatial grid of 2º × 2º (longitude × latitude) that comprises San Benedicto Island, we found a high concordance between both temperatures, showing the robustness of the procedure. A drawback of this method is that no unique calibration exists for the Sr/Ca–SST and Mg/Ca–SST relations, and the different calibrations published generate discrepancies of up to 8ºC in the calculated temperature, regardless of whether the thermal sensitivity (i.e., the slope of the paleotemperature equation) of corals is similar. We therefore concluded that the Sr/Ca and Mg/Ca paleothermometers are highly reliable in this region of the Pacific Ocean, provided that a specific equation exists for the area under study.
publisher Iniversidad Autónoma de Baja California
publishDate 2004
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/339
_version_ 1715723956950925312
spelling oai:cienciasmarinas.com.mx:article-3392019-04-09T23:14:39Z Calibration of Sr/Ca and Mg/Ca paleothermometers in coral Porites sp. from San Benedicto Island, Revillagigedo Archipelago, Mexico Calibración de los paleotermómetros de Sr/Ca y Mg/Ca en el coral Porites sp. de Isla San Benedicto, Archipiélago Revillagigedo, México Villaescusa, JA Carriquiry, JD Sr/Ca Mg/Ca coral skeletons Porites sea surface temperature Sr/Ca Mg/Ca esqueletos de coral Porites temperatura superficial del mar A better understanding of the global climate system depends on our ability to expand the limited instrumental records of sea surface temperature (SST) of tropical regions. The Sr/Ca and Mg/Ca ratios contained in the growth bands of corals have proved to be an accurate tool to reconstruct SST variability. In this study we show the calibration obtained from the seasonal geochemical measurement of the Sr/Ca and Mg/Ca molar ratios in the skeleton of coral of the genus Porites from San Benedicto Island, in the Revillagigedo Archipelago, and SST. The geochemical ratios measured (precision ±0.2%, 2σ) showed a high seasonal covariation closely related to the region's SST. The calibration equation calculated for the Sr/Ca–SST relation (n = 52) was Sr/Ca (mmol mol–1) = 10.467 (±0.067) – 0.0524 (±0.003) × SST (r2 = 0.894), and for the Mg/Ca?SST relation it was Mg/Ca (mmol mol–1) = 1.550 (±0.095) + 0.0956 (±0.0043) × STT (r2 = 0.906). When comparing the SST time series reconstructed from the Sr/Ca and Mg/Ca ratios with the mean SST of a spatial grid of 2º × 2º (longitude × latitude) that comprises San Benedicto Island, we found a high concordance between both temperatures, showing the robustness of the procedure. A drawback of this method is that no unique calibration exists for the Sr/Ca–SST and Mg/Ca–SST relations, and the different calibrations published generate discrepancies of up to 8ºC in the calculated temperature, regardless of whether the thermal sensitivity (i.e., the slope of the paleotemperature equation) of corals is similar. We therefore concluded that the Sr/Ca and Mg/Ca paleothermometers are highly reliable in this region of the Pacific Ocean, provided that a specific equation exists for the area under study. Comprender mejor el sistema climático global depende de nuestra capacidad de extender los limitados registros instrumentales de la temperatura oceánica superficial (TOS) de regiones tropicales. Las razones elementales Sr/Ca y Mg/Ca contenidas en las bandas de crecimiento del coral han demostrado ser una herramienta muy precisa para reconstruir la variabilidad de la TOS. En este estudio presentamos la calibración obtenida a partir de la medición geoquímica estacional entre las razones molares Sr/Ca y Mg/Ca en el esqueleto de coral del género Porites de Isla San Benedicto, Archipiélago Revillagigedo, y la TOS. Las razones geoquímicas medidas (precisión ±0.2%, 2σ) mostraron una alta covariación estacional estrechamente relacionada con la TOS de la región. La ecuación de calibración calculada para la relación Sr/Ca-TOS (n = 52) fue Sr/Ca (mmol mol–1) = 10.467 (±0.067) – 0.0524 (±0.003) × TOS (r2 = 0.894) y para la relación Mg/Ca-TOS fue Mg/Ca (mmol mol–1) = 1.550 (±0.095) + 0.0956 (±0.0043) × TOS (r2 = 0.906). Comparando las series de tiempo de la TOS reconstruida a partir de las razones Sr/Ca y Mg/Ca con la TOS media de una malla espacial de 2º × 2º (longitud × latitud) que incluye Isla San Benedicto, encontramos una alta concordancia entre ambas, lo que demuestra la robustez del procedimiento. Un inconveniente del método es que no existe una calibración única para las relaciones Sr/Ca-TOS y Mg/Ca-TOS y las diferentes calibraciones publicadas generan una discrepancia hasta de 8ºC en la temperatura calculada, independientemente de que la sensitividad térmica (i.e. pendiente de la ecuación de paleotemperatura) de los corales sea muy similar. Por lo tanto, concluimos que los paleotermómetros de Sr/Ca y Mg/Ca son altamente confiables en esta región del Pacífico, siempre y cuando exista una ecuación específica para la zona de estudio en cuestión. Iniversidad Autónoma de Baja California 2004-03-06 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/339 10.7773/cm.v30i4.339 Ciencias Marinas; Vol. 30 No. 4 (2004); 603-618 Ciencias Marinas; Vol. 30 Núm. 4 (2004); 603-618 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/339/289

Những quyển sách tương tự