Articles | Volume 18, issue 6
https://doi.org/10.5194/cp-18-1453-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-18-1453-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
27 Jun 2022
Research article |
| 27 Jun 2022
| 27 Jun 2022
A 334-year coral record of surface temperature and salinity variability in the greater Agulhas Current region
School of Geography, Geology and the Environment, University of Leicester, Leicester, LE1 7RH, United Kingdom
Molecular and Life Sciences, Curtin University, Perth, WA 6102, Australia
Australian Institute of Marine Science, Townsville, QLD 4810, Australia
School of Geography, Archaeology and Environmental Studies, University of Witwatersrand, Witwatersrand, South Africa
Takaaki K. Watanabe
Institute for Geosciences, University of Kiel, 24118 Kiel, Germany
KIKAI Institute for Coral Reef Sciences, Kikai Town, Kagoshima 891-6151, Japan
Siren Rühs
GEOMAR Helmholtz Centre for Ocean Research Kiel, 24105 Kiel, Germany
Miriam Pfeiffer
Institute for Geosciences, University of Kiel, 24118 Kiel, Germany
Stefan Grab
School of Geography, Archaeology and Environmental Studies, University of Witwatersrand, Witwatersrand, South Africa
Dieter Garbe-Schönberg
Institute for Geosciences, University of Kiel, 24118 Kiel, Germany
Department of Physics and Earth Sciences, Jacobs University Bremen, 28759 Bremen, Germany
Arne Biastoch
GEOMAR Helmholtz Centre for Ocean Research Kiel, 24105 Kiel, Germany
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Sarina Schmidt, Ed C. Hathorne, Joachim Schönfeld, and Dieter Garbe-Schönberg
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Ioana Ivanciu, Katja Matthes, Arne Biastoch, Sebastian Wahl, and Jan Harlaß
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Maike Leupold, Miriam Pfeiffer, Takaaki K. Watanabe, Lars Reuning, Dieter Garbe-Schönberg, Chuan-Chou Shen, and Geert-Jan A. Brummer
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Clim. Past, 16, 679–697, https://doi.org/10.5194/cp-16-679-2020, https://doi.org/10.5194/cp-16-679-2020, 2020
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Maxim V. Portnyagin, Vera V. Ponomareva, Egor A. Zelenin, Lilia I. Bazanova, Maria M. Pevzner, Anastasia A. Plechova, Aleksei N. Rogozin, and Dieter Garbe-Schönberg
Earth Syst. Sci. Data, 12, 469–486, https://doi.org/10.5194/essd-12-469-2020, https://doi.org/10.5194/essd-12-469-2020, 2020
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Nele Tim, Eduardo Zorita, Kay-Christian Emeis, Franziska U. Schwarzkopf, Arne Biastoch, and Birgit Hünicke
Earth Syst. Dynam., 10, 847–858, https://doi.org/10.5194/esd-10-847-2019, https://doi.org/10.5194/esd-10-847-2019, 2019
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Franziska U. Schwarzkopf, Arne Biastoch, Claus W. Böning, Jérôme Chanut, Jonathan V. Durgadoo, Klaus Getzlaff, Jan Harlaß, Jan K. Rieck, Christina Roth, Markus M. Scheinert, and René Schubert
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Josefine Maas, Susann Tegtmeier, Birgit Quack, Arne Biastoch, Jonathan V. Durgadoo, Siren Rühs, Stephan Gollasch, and Matej David
Ocean Sci., 15, 891–904, https://doi.org/10.5194/os-15-891-2019, https://doi.org/10.5194/os-15-891-2019, 2019
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Siren Rühs, Franziska U. Schwarzkopf, Sabrina Speich, and Arne Biastoch
Ocean Sci., 15, 489–512, https://doi.org/10.5194/os-15-489-2019, https://doi.org/10.5194/os-15-489-2019, 2019
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Here we report seasonally resolved sea surface temperature (SST) reconstructions for the southern Mozambique Channel in the SW Indian Ocean, a region located along the thermohaline ocean surface circulation route, based on multi-trace-element temperature proxy records preserved in two Porites sp. coral cores for the past 42 years. Particularly, we show the suitability of both separate and combined Sr / Ca and Li / Mg proxies for improved multielement SST reconstructions.
Janne Repschläger, Dieter Garbe-Schönberg, Mara Weinelt, and Ralph Schneider
Clim. Past, 13, 333–344, https://doi.org/10.5194/cp-13-333-2017, https://doi.org/10.5194/cp-13-333-2017, 2017
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We reconstruct changes in the warm water transport from the subtropical to the subpolar North Atlantic over the last 10 000 years. We use stable isotope and Mg / Ca ratios measured on surface and subsurface dwelling foraminifera. Results indicate an overall stable warm water transport at surface. The northward transport at subsurface evolves stepwise and stabilizes at 7 ka BP on the modern mode. These ocean transport changes seem to be controlled by the meltwater inflow into the North Atlantic.
Jens Zinke, Lars Reuning, Miriam Pfeiffer, Jasper A. Wassenburg, Emily Hardman, Reshad Jhangeer-Khan, Gareth R. Davies, Curtise K. C. Ng, and Dick Kroon
Biogeosciences, 13, 5827–5847, https://doi.org/10.5194/bg-13-5827-2016, https://doi.org/10.5194/bg-13-5827-2016, 2016
Short summary
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Our work provides a new coral proxy-based reconstruction of sea surface temperature (SST) from the coral reefs of Rodrigues Island, located in the poorly studied south-central Indian Ocean trade wind belt. This site is well located to study the SST history of the subtropical Indian Ocean and its teleconnections with the Pacific over long timescales. Our results provide insights into biases in coral Sr / Ca-based SST reconstructions and how to avoid them.
D. Le Bars, J. V. Durgadoo, H. A. Dijkstra, A. Biastoch, and W. P. M. De Ruijter
Ocean Sci., 10, 601–609, https://doi.org/10.5194/os-10-601-2014, https://doi.org/10.5194/os-10-601-2014, 2014
C. van den Bogaard, B. J. L. Jensen, N. J. G. Pearce, D. G. Froese, M. V. Portnyagin, V. V. Ponomareva, and V. Wennrich
Clim. Past, 10, 1041–1062, https://doi.org/10.5194/cp-10-1041-2014, https://doi.org/10.5194/cp-10-1041-2014, 2014
Cited articles
Abram, N. J., Wright, N. M., Ellis, B., Dixon, B. C., Wurtzel, J. B.,
England, M. H., Ummenhofer, C. C., Philibosian, B., Cahyarini, S. Y., Yu, T.
L., Shen, C. C., Cheng, H., Edwards, R. L., and Heslop, D.: Coupling of
Indo-Pacific climate variability over the last millennium, Nature, 579,
385–392, 2020.
Backeberg, B. C. and Reason, C. J. C.: A connection between the South
Equatorial Current north of Madagascar and Mozambique Channel eddies,
Geophys. Res. Lett., 37, L04604, https://doi.org/10.1029/2009GL041950, 2010.
Backeberg, B. C., Penven, P., and Rouault, M.: Impact of intensified Indian
Ocean winds on mesoscale variability in the Agulhas system, Nat. Clim.
Change, 2, 608–612, 2012.
Beal, L. M. and Elipot, S.: Broadening not strengthening of the Agulhas
Current since the early 1990s, Nature, 540, 570–573, 2016.
Beal, L. M., De Ruijter, W. P. M., Biastoch, A., Zahn, R., Cronin, M., Hermes, J., Lutjeharms, J., Quartly, G., Tozuka, T., Baker-Yeboah, S., Bornman, T., Cipollini, P., Dijkstra, H., Hall, I., Park, W., Peeters, F., Penven, P., Ridderinkhof, H., and Zinke, J.: On the role of the Agulhas system in ocean circulation and climate, Nature, 472, 429–436, 2011.
Bevington, P. R.: Data reduction and error analysis for the physical
sciences, chapter 4: Propagation of error, Mc Graw-Hill Book Co., New York,
San Francisco, St. Louis, Toronto, London, Sydney, 56–65, ISBN 0-07-247227-8, 2003.
Biastoch, A., Boening, C. W., Schwarzkopf, U., and Lutjeharms, J. R. E.:
Increase in Agulhas leakage due to poleward shift of the Southern Hemisphere westerlies, Nature, 462, 495–498, 2009.
Biastoch, A., Durgadoo, J. V., Morrison, A. K., van Sebille, E., Weijer, W.,
and Griffies, S. M.: Atlantic multi-decadal oscillation covaries with Agulhas
leakage, Nat. Commun., 6, 10082, https://doi.org/10.1038/ncomms10082, 2015.
Biastoch, A., Schwarzkopf, F. U., Getzlaff, K., Rühs, S., Martin, T., Scheinert, M., Schulzki, T., Handmann, P., Hummels, R., and Böning, C. W.: Regional imprints of changes in the Atlantic Meridional Overturning Circulation in the eddy-rich ocean model VIKING20X, Ocean Sci., 17, 1177–1211, https://doi.org/10.5194/os-17-1177-2021, 2021.
Bruggemann, H., Rodier, M., Guillaume, M. M., Andréfouët, S., Arfi,
R., Cinner, J., Pichon, M., Ramahatratra, F., Rasoamanendrika, F., Zinke,
J., and McClanahan, T.: Social-ecological problems forcing unprecedented change on the latitudinal margins of coral reefs: the case of southwest Madagascar, Ecol. Soc., 17, 47, https://doi.org/10.5751/ES-05300-170447, 2012.
Boutin, J., Reul, N., Koehler, J., Martin, A., Catany, R., Guimbard, S., Rouffi, F., Vergely, J. L., Arias, M., Chakroun, M., Corato, G., Estella-Perez, V., Hasson, A., Josey, S., Khvorostyanov, D., Kolodziejczyk, N., Mignot, J., Olivier, L., Reverdin, G., Stammer, D., Supply, A., Thouvenin-Masson, C., Turiel, A., Vialard, J., Cipollini, P., Donlon, C., Sabia, R., and Mecklenburg, S..: Satellite-based sea surface salinity designed for ocean and climate studies, J. Geophys. Res.-Oceans, 126, e2021JC017676, https://doi.org/10.1029/2021JC017676, 2021.
Cahyarini, S. Y., Pfeiffer, M., Timm, O., Dullo, W.-C., and Schönberg,
D. G.: Reconstructing seawater δ18O from paired coral δ18O and
Cobb, K. M., Westphal, N., Sayani, H. R., Watson, J. T., Di Lorenzo, E.,
Cheng, H., and Charles, C. D.: Highly variable El Niño–Southern
Oscillation throughout the Holocene, Science, 339, 67–70, 2013.
Corrège, T.: Sea surface temperature and salinity reconstruction from
coral geochemical tracers, Palaeogeogr. Palaeocl. Palaeoecol., 232, 408–428, 2006.
Crueger, T., Zinke, J., and Pfeiffer, M.: Patterns of Pacific decadal variability recorded by Indian Ocean corals, Int. J. Earth Sci., 98, 41–52,
2009.
Damassa, T. D., Cole, J. E., Barnett, H. R., Ault, T. R., and McClanahan, T. R.: Enhanced multidecadal climate variability in the seventeenth century from
coral isotope records in the western Indian Ocean, Paleoceanography, 21,
PA2016, https://doi.org/10.1029/2005PA001217, 2006.
de Ruijter, W. P. M., Ridderinkhof, H., and Schouten, M. W.: Variability of
the southwest Indian Ocean. Philos. T. Roy. Soc. A, 363, 63–76, 2005.
de Villiers, S., Greaves, M., and Elderfield, H.: An intensity ratio calibration method for the accurate determination of
Elipot, S. and Beal, L. M.: Observed Agulhas Current Sensitivity to Interannual and Long-Term Trend Atmospheric Forcings, J. Climate, 31, 3077–3098, 2018.
Emile-Geay, J., Cobb, K. M., Mann, M. E., Wittenberg, A. T. Estimating
tropical Pacific SST variability over the past millennium. Part 2:
Reconstructions and uncertainties, J. Climate, 26, 2329–2352, 2013.
Feng, M. and Meyers, G.: Interannual variability in the tropical Indian
Ocean: A two-year time-scale of Indian Ocean dipole, Deep-Sea Res. Pt. II, 50, 2263–2284, 2003.
Freeman, E., Woodruff, S. D., Worley, S. J., Lubker, S. J., Kent, E. C.,
Angel, W. E., Berry, D. I., Brohan, P., Eastman, R., Gates, L., Gloeden, W.,
Ji, Z., Lawrimore, J., Rayner, N. A., Rosenhagen, G., and Smith, S. R.: ICOADS Release 3.0: A major update to the historical marine climate record, Int. J. Climatol., 37, 2211–2237, 2017.
Giese, B. S. and Ray S.: El Niño variability in simple ocean data
assimilation (SODA), 1871–2008, J. Geophys. Res., 116, C02024,
https://doi.org/10.1029/2010JC006695, 2011.
Giese, B. S., Seidel, H. F., Compo, G. P., and Sardeshmukh, P. D.: An ensemble of ocean reanalyses for 1815–2013 with sparse observational input, J. Geophys. Res.-Oceans, 121, 6891–6910, 2016.
Good, S. A., Martin, M. J., and Rayner, N. A.: EN4: Quality controlled ocean
temperature and salinity profiles and monthly objective analyses with
uncertainty estimates, J. Geophys. Res.-Oceans, 118, 6704–6716, 2013.
Grove, C. A., Zinke, J., Scheufen, T., Maina, J., Epping, E., Boer, W., Randriamanantsoa, B., and Brummer, G.-J. A.: Spatial linkages between coral proxies of terrestrial runoff across a large embayment in Madagascar, Biogeosciences, 9, 3063–3081, https://doi.org/10.5194/bg-9-3063-2012, 2012.
Grove, C. A., Zinke, J., Peeters, F., Park, W., Scheufen, T., Kasper, S., Randriamanantsoa, B., McCulloch, M. T., and Brummer, G.-J. A.: Madagascar corals reveal a multidecadal signature of rainfall and river runoff since 1708, Clim. Past, 9, 641–656, https://doi.org/10.5194/cp-9-641-2013, 2013.
Grunseich, G., Subrahmanyam, B., Murty, V. S. N., and Giese, B. S.: Sea surface salinity variability during the Indian Ocean Dipole and ENSO events in the tropical Indian Ocean, J. Geophys. Res., 116, C11013, https://doi.org/10.1029/2011JC007456, 2011.
Harris, A., Manahira, G., Sheppard, A., Gouch, C., and Sheppard, C.: Demise of Madagascar's once great barrier reef: changes in coral reef conditions over 40 years, Atoll Research Bulletin, 574, 16, https://doi.org/10.5479/si.00775630.574.16, 2010.
Hegerl, G. C., Black, E., Allan, R. P., Ingram, W. J., Polson, D., Trenberth, K. E., Chadwick, R. S., Arkin, P. A., Sarojini, B. B., Becker, A., Dai, A., Durack, P. J., Easterling, D., Fowler, H. J., Kendon, E. J., Huffman, G. J., Liu, C., Marsh, R., New, M., Osborn, T. J., Skliris, N., Stott, P. A., Vidale, P., Wijffels, S. E., Wilcox, L. J., Willett, K. M., and Zhang, X.: Challenges in quantifying changes in the global water cycle, B. Am. Meteorol. Soc., 96, 1097–1115, 2015.
Hu, S. and Fedorov, A. A.: Indian Ocean warmng can strengthen the Atlantic
meridional overturning circulation, Nat. Clim. Change, 9, 747–751, 2019.
Huang, B., Thorne, P. W., Banzon, V. F., Boyer, T., Cherupin, G., Lawrimore,
J. H., Menne, M. J., Smith, T. M., Vose, R. S., and Zhang, H. M.: Extended
Reconstructed Sea Surface Temperature, Version 5 (ERSSTv5): Upgrades,
Validations, and Intercomparisons, J. Climate, 30, 8179–8205, 2017.
Large, W. G. and Yeager, S.: The global climatology of an interannually
varying air-sea flux data set, Clim. Dynam., 33, 341–364, 2009.
LeGrande, A. N. and Schmidt, G. A.: Global gridded data set of the oxygen
isotopic composition in seawater, Geophys. Res. Lett., 33, L12604,
https://doi.org/10.1029/2006GL026011, 2006.
LeGrande, A. N. and Schmidt, G. A.: Water isotopologues as a quantitative
paleosalinity proxy, Paleoceanography, 26, PA3225, https://doi.org/10.1029/2010PA002043, 2011.
Leupold, M., Pfeiffer, M., Watanabe, T. K., Reuning, L., Garbe-Schönberg, D., Shen, C.-C., and Brummer, G.-J. A.: El Niño–Southern Oscillation and internal sea surface temperature variability in the tropical Indian Ocean since 1675, Clim. Past, 17, 151–170, https://doi.org/10.5194/cp-17-151-2021, 2021.
Lough, J. M.: A strategy to improve the contribution of coral data to
high-resolution paleoclimatology, Palaeogeogr. Palaeoclimatol. Palaeoecol.,
204, 115–143, 2004.
Loveday, B. R., Durgadoo, J. V., Reason, C. J. C., Biastoch, A., and Penven,
P.: Decoupling of the Agulhas Current from the Agulhas Leakage, J. Phys.
Oceanogr., 44, 1776–1797, 2014.
McClanahan, T. R., Ateweberhan, M., Omukoto, J., and Pearson, L.: Recent
seawater temperature histories, status, and predictions for Madagascar's
coral reefs, Mar. Ecol. Prog. Ser., 380, 117–128, 2008.
McClanahan, T. R., Ateweberhan, M., Omukoto, J., and Pearson, L.: Recent seawater temperature histories, status, and predictions for Madagascar’s coral reefs, Mar. Ecol. Prog. Ser., 380, 117–128, 2009.
NOAA NCEI (National Centers for Environmental Information): Paleo Data, NOAA NCEI [data set], https://www.ncei.noaa.gov/products/paleoclimatology, last access: 7 June 2022.
Palastanga, V., van Leeuwen, P. J., and de Ruijter, W. P. M.: A link between
low-frequency mesoscale eddy variability around Madagascar and the
large-scale Indian Ocean variability, J. Geophys. Res., 111, C09029,
https://doi.org/10.1029/2005JC003081, 2006.
Paris, M. L. and Subrahmanyam, B.: Role of El Niño Southern Oscillation
(ENSO) Events on Temperature and Salinity Variability in the Agulhas Leakage
Region, Remote Sens., 10, 127, https://doi.org/10.3390/rs10010127, 2018.
Peeters, F. J. C., Acheson, R., Brummer, G.-J. A., de Ruijter, W. P. M., Schneider, R. R., Ganssen, G. M., Ufkes, E., and Kroon, D.: Vigorous exchange between the Indian and Atlantic oceans at the end of the past five glacial periods, Nature, 430, 661–665, 2004.
Pfeiffer, M., Timm, O., and Dullo, W.-C.: Oceanic forcing of interannual and
multidecadal climate variability in the southwestern Indian Ocean: evidence
from a 160 year coral isotopic record (La Reunion, 50∘ E, 21∘ S), Paleoceanography, 19, PA4006, https://doi.org/10.1029/2003PA000964, 2004.
Pfeiffer, M., Reuning, L., Zinke, J., Garbe-Schönberg, D., Leupold, M., and Dullo, W.-C.: 20th Century δ18O Seawater and Salinity Variations Reconstructed From Paired δ18O and
Potemra, J. T.: Contribution of equatorial Pacific winds to southern
tropical Indian Ocean Rossby waves, J. Geophys. Res., 106, 2407–2422, 2001.
Putrasahan, D., Kirtman, B. P., and Beal, L. M.: Modulation of SST
interannual variability in the Agulhas leakage region associated with ENSO,
J. Climate, 29, 7089–7102, 2016.
Rahmstorf, S., Box, J. E., Feulner, G., Mann, M. E., Robinson, A.,
Rutherford, S., and Schaffernicht, E. J.: Exceptional twentieth-century slowdown in Atlantic Ocean overturning circulation, Nat. Clim. Change, 5, 475–480, 2015.
Randriamahefasoa, T. S. M. and Reason, C. J. C.: Interannual variability of rainfall characteristics over southwestern Madagascar, Theor. Appl. Climatol., 128, 421–437, 2017.
Rayner, N. A., Parker, D. E., Horton, E. B., Folland, C. K., Alexander, L.
V., Rowell, D. P., Kent, E. C., and Kaplan, A.: Global analyses of sea surface temperature, sea ice, and night marine air temperature since the late
nineteenth century, J. Geophys. Res., 108, 4407, https://doi.org/10.1029/2002JD002670, 2003.
Reason, C. J. C.: Subtropical Indian Ocean SST dipole events and southern
African rainfall, Geophys. Res. Lett., 28, 2225–2227, 2001.
Reason, C. J. C. and Rouault, M.: ENSO-like decadal variability and South
African rainfall, Geophys. Res. Lett., 29, 16-1–16-4, https://doi.org/10.1029/2002GL014663, 2002.
Rouault, M., Penven, P., and Pohl, B.: Warming in the Agulhas system since
the 1980's, Geophys. Res. Lett., 36, L12602, https://doi.org/10.1029/2009GL037987, 2009.
Schmidt, C., Schwarzkopf, F. U., Rühs, S., and Biastoch, A.: Characteristics and robustness of Agulhas leakage estimates: an inter-comparison study of Lagrangian methods, Ocean Sci., 17, 1067–1080, https://doi.org/10.5194/os-17-1067-2021, 2021.
Schott, F. A., Xie, S. P., and McCreary Jr, J. P.: Indian Ocean Circulation and Climate Variability, Rev. Geophys., 47, 1–46, 2009.
Schouten, M. W., de Ruijter, W. P. M., van Leeuwen, P. J., and Dijkstra, H. A.: An oceanic teleconnection between the equatorial and southern Indian Ocean, Geophys. Res. Lett., 29, 591–594, 2002.
Schwarzkopf, F. U., Biastoch, A., Böning, C. W., Chanut, J., Durgadoo, J. V., Getzlaff, K., Harlaß, J., Rieck, J. K., Roth, C., Scheinert, M. M., and Schubert, R.: The INALT family – a set of high-resolution nests for the Agulhas Current system within global NEMO ocean/sea-ice configurations, Geosci. Model Dev., 12, 3329–3355, https://doi.org/10.5194/gmd-12-3329-2019, 2019.
Schrag, D. P.: Rapid analyses of high-precision
Simon, M. H., Arthur, K. L., Hall, I. R., Peeters, F. J. C., Loveday, B. R.,
Barker, S., Ziegler, M., and Zahn, R.: Millennial-scale Agulhas Current
variability and its implications for salt-leakage through the Indian–Atlantic Ocean Gateway, Earth Planet. Sc. Lett., 383, 101–112,
2013.
Skliris, N., Marsh, R., Josey, S. A., Good, S. A., Liu, C., and Allan, R. P.:
Salinity changes in the World Ocean since 1950 in relation to changing
surface freshwater fluxes, Clim. Dynam., 43, 709–736,
https://doi.org/10.1007/s00382-014-2131-7, 2014.
Smerdon, J. E., Luterbacker, J., and Phipps, S. J.: Hydro2k: Integrating proxy data and models for insights into past and future hydroclimate, Past Global Changes Magazine 24, 45, https://doi.org/10.22498/pages.24.1.45, 2016.
Steiger, N. J., Smerdon, J. E., Cook, E. R., and Cook, B. I.: Data
Descriptor: A reconstruction of global hydroclimate and dynamical variables
over the Common Era. Sci. Data, 5, 180086, https://doi.org/10.1038/sdata.2018.86, 2018.
Thompson, D. M., Ault, T. R., Evans, M. N., Cole, J. E., and Emile-Geay, J.:
Comparison of observed and simulated tropical climate trends using a forward
model of coral δ18O, Geophys. Res. Lett., 38, L14706,
https://doi.org/10.01029/2011GL048224, 2011.
Torrence, C. and Compo, G. P.: A practical guide to wavelet analysis, B.
Am. Meteorol. Soc., 79, 61–78, 1998.
Trott, C. B., Subrahmanyam, B., and Washburn, C. E.: Investigating the response of temperature and salinity in the Agulhas Current region to ENSO events, Remote Sens., 13, 1829, https://doi.org/10.3390/rs13091829, 2021.
Trouet, V. and Van Oldenborgh, G. J.: KNMI Climate Explorer: A Web-Based
Research Tool for High-Resolution Paleoclimatology, Tree-Ring Res., 69,
3–13, 2013.
Tsujino, H., Urakawa, S., Nakano, H., Small, R. J., Kim, W. M., Yeager, S. G., Danabasoglu, G., Suzuki, T., Bamber, J. L., Bentsen, M., Böning, C. W., Bozec, A., Chassignet, E. P., Curchitser, E., Boeira Dias, F., Durack, P. J. Griffies, S. M., Harada, Y., Ilicak, M., Josey, S., A., Kobayashi, C., Kobayashi, S., Komuro, Y., Large, W. G., Le Sommer, J., Marsland, S. J., Masina, S., Scheinert, M., Tomita, H., Valdivieso, M., and Yamazaki, D.: JRA-55 based surface dataset for driving ocean–sea-ice models (JRA55-do), Ocean Model., 130, 79–139, 2018.
Watanabe, T. K. and Pfeiffer, M.: A simple Monte Carlo approach to
estimate the uncertainties of SST and δ18Osw inferred from coral proxies, Geochem. Geophy. Geosy., 23, e2021GC009813, https://doi.org/10.1029/2021GC009813, 2022
Wijffels, S. and Meyers, G.: An intersection of oceanic waveguides: Variability in the Indonesian Throughflow region, J. Phys. Oceanogr., 34,
1232–1253, 2004.
Wolter, K. and Timlin, M. S.: Measuring the strength of ENSO events – how
does 1997/98 rank?, Weather, 53, 315–324, 1998.
Wolter, K. and Timlin, M. S.: El Niño/Southern Oscillation behaviour
since 1871 as diagnosed in an extended multivariate ENSO index (MEI.ext), Int. J. Climatol., 31, 1074–1087, 2011.
Woodruff, S. D., Worley, S. J., Lubker, S. J., Ji, Z., Freeman, J. E., Berry,
D. I., Brohan, P., Kent, E. C., Reynolds, R. W., Smith, S. R., and Wilkinson,
C.: ICOADS Release 2.5: Extensions and enhancements to the surface marine
meteorological archive, Int. J. Climatol., 31, 951–967, 2011.
Zinke, J., Dullo, W.-C., Heiss, G. A., and Eisenhauer, A.: ENSO and Indian
Ocean subtropical dipole variability is recorded in a coral record off southwest Madagascar for the period 1659–1995, Earth Planet. Sc. Lett., 228,
177–194, 2004.
Zinke, J., Timm, O., Pfeiffer, M., Dullo, W.-Ch., Kroon, D., and Thomassin,
B. A.: Mayotte coral reveales hydrological changes in the western Indian
between 1865 to 1994, Geophys. Res. Lett., 35, L23707, https://doi.org/10.1029/2008GL035634, 2008.
Zinke, J., Pfeiffer, M., Timm, O., Dullo, W.-Ch., and Brummer, G. J. A.:
Western Indian Ocean marine and terrestrial records of climate variability:
a review and new concepts on land-ocean interaction since A.D. 1660,
Int. J. Earth Sci., 98, 115–133, 2009.
Zinke, J., Loveday, B., Reason, C., Dullo, W.-C., and Kroon, D.: Madagascar
corals track sea surface temperature variability in the Agulhas Current core
region over the past 334 years, Scientific Reports 4, 4393, https://doi.org/10.1038/srep04393, 2014.
Zinke, J., Reuning, L., Pfeiffer, M., Wassenburg, J. A., Hardman, E., Jhangeer-Khan, R., Davies, G. R., Ng, C. K. C., and Kroon, D.: A sea surface temperature reconstruction for the southern Indian Ocean trade wind belt from corals in Rodrigues Island (19∘ S, 63∘ E), Biogeosciences, 13, 5827–5847, https://doi.org/10.5194/bg-13-5827-2016, 2016.
Short summary
Salinity is an important and integrative measure of changes to the water cycle steered by changes to the balance between rainfall and evaporation and by vertical and horizontal movements of water parcels by ocean currents. However, salinity measurements in our oceans are extremely sparse. To fill this gap, we have developed a 334-year coral record of seawater oxygen isotopes that reflects salinity changes in the globally important Agulhas Current system and reveals its main oceanic drivers.
Salinity is an important and integrative measure of changes to the water cycle steered by...
