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2017
Alpert, Alice E.; Cohen, Anne L.; Oppo, Delia W.; DeCarlo, Thomas M.; Gaetani, Glenn A.; Hernandez-Delgado, Edwin A.; Winter, Amos; Gonneea, Meagan E.
Twentieth century warming of the tropical Atlantic captured by Sr-U paleothermometry Journal Article
In: Paleoceanography and Paleoclimatology, vol. 32, iss. 2, pp. 146-160, 2017.
Abstract | Links | BibTeX | Tags: Atlantic and Pacific Corals, Climate Reconstruction, Coral Paleothermometry, Coral Reef Studies, Coral Skeletons, Mona Island, Multispecies Calibration, Multiyear Variability, Ocean Conditions Archive, Past Ocean Temperatures, Puerto Rico, Rayleigh Fractionation, Sr-U Thermometer, Sr/Ca Ratio, Twentieth Century Warming, U/Ca Ratio
@article{Alpert2017,
title = {Twentieth century warming of the tropical Atlantic captured by Sr-U paleothermometry},
author = {Alice E. Alpert and Anne L. Cohen and Delia W. Oppo and Thomas M. DeCarlo and Glenn A. Gaetani and Edwin A. Hernandez-Delgado and Amos Winter and Meagan E. Gonneea},
url = {https://sampr.org/alpert-et-al-2017-20th-century-warming-atlantic-sr-u-paleothermometry/
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2016pa002976
},
doi = {https://doi.org/10.1002/2016PA002976},
year = {2017},
date = {2017-01-26},
urldate = {2016-01-26},
journal = {Paleoceanography and Paleoclimatology},
volume = {32},
issue = {2},
pages = {146-160},
abstract = {Coral skeletons are valuable archives of past ocean conditions. However, interpretation of coral paleotemperature records is confounded by uncertainties associated with single-element ratio thermometers, including Sr/Ca. A new approach, Sr-U, uses U/Ca to constrain the influence of Rayleigh fractionation on Sr/Ca. Here we build on the initial Pacific Porites Sr-U calibration to include multiple Atlantic and Pacific coral genera from multiple coral reef locations spanning a temperature range of 23.15–30.12°C.
Accounting for the wintertime growth cessation of one Bermuda coral, we show that Sr-U is strongly correlated with the average water temperature at each location (r² = 0.91, P < 0.001, n = 19). We applied the multispecies spatial calibration between Sr-U and temperature to reconstruct a 96-year long temperature record at Mona Island, Puerto Rico, using a coral not included in the calibration. Average Sr-U derived temperature for the period 1900–1996 is within 0.12°C of the average instrumental temperature at this site and captures the twentieth-century warming trend of 0.06°C per decade. Sr-U also captures the timing of multiyear variability but with higher amplitude than implied by the instrumental data.
Mean Sr-U temperatures and patterns of multiyear variability were replicated in a second coral in the same grid box. Conversely, Sr/Ca records from the same two corals were inconsistent with each other and failed to capture absolute sea temperatures, timing of multiyear variability, or the twentieth-century warming trend. Our results suggest that coral Sr-U paleothermometry is a promising new tool for reconstruction of past ocean temperatures.},
keywords = {Atlantic and Pacific Corals, Climate Reconstruction, Coral Paleothermometry, Coral Reef Studies, Coral Skeletons, Mona Island, Multispecies Calibration, Multiyear Variability, Ocean Conditions Archive, Past Ocean Temperatures, Puerto Rico, Rayleigh Fractionation, Sr-U Thermometer, Sr/Ca Ratio, Twentieth Century Warming, U/Ca Ratio},
pubstate = {published},
tppubtype = {article}
}
Coral skeletons are valuable archives of past ocean conditions. However, interpretation of coral paleotemperature records is confounded by uncertainties associated with single-element ratio thermometers, including Sr/Ca. A new approach, Sr-U, uses U/Ca to constrain the influence of Rayleigh fractionation on Sr/Ca. Here we build on the initial Pacific Porites Sr-U calibration to include multiple Atlantic and Pacific coral genera from multiple coral reef locations spanning a temperature range of 23.15–30.12°C.
Accounting for the wintertime growth cessation of one Bermuda coral, we show that Sr-U is strongly correlated with the average water temperature at each location (r² = 0.91, P < 0.001, n = 19). We applied the multispecies spatial calibration between Sr-U and temperature to reconstruct a 96-year long temperature record at Mona Island, Puerto Rico, using a coral not included in the calibration. Average Sr-U derived temperature for the period 1900–1996 is within 0.12°C of the average instrumental temperature at this site and captures the twentieth-century warming trend of 0.06°C per decade. Sr-U also captures the timing of multiyear variability but with higher amplitude than implied by the instrumental data.
Mean Sr-U temperatures and patterns of multiyear variability were replicated in a second coral in the same grid box. Conversely, Sr/Ca records from the same two corals were inconsistent with each other and failed to capture absolute sea temperatures, timing of multiyear variability, or the twentieth-century warming trend. Our results suggest that coral Sr-U paleothermometry is a promising new tool for reconstruction of past ocean temperatures.
Accounting for the wintertime growth cessation of one Bermuda coral, we show that Sr-U is strongly correlated with the average water temperature at each location (r² = 0.91, P < 0.001, n = 19). We applied the multispecies spatial calibration between Sr-U and temperature to reconstruct a 96-year long temperature record at Mona Island, Puerto Rico, using a coral not included in the calibration. Average Sr-U derived temperature for the period 1900–1996 is within 0.12°C of the average instrumental temperature at this site and captures the twentieth-century warming trend of 0.06°C per decade. Sr-U also captures the timing of multiyear variability but with higher amplitude than implied by the instrumental data.
Mean Sr-U temperatures and patterns of multiyear variability were replicated in a second coral in the same grid box. Conversely, Sr/Ca records from the same two corals were inconsistent with each other and failed to capture absolute sea temperatures, timing of multiyear variability, or the twentieth-century warming trend. Our results suggest that coral Sr-U paleothermometry is a promising new tool for reconstruction of past ocean temperatures.