K. Halimeda Kilbourne

University of Maryland Center for Environmental Science

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Terrence M. Quinn

The University of Texas at Austin

Nerilie J. Abram

Australian National University

Johan Schijf

University of Maryland Center for Environmental Science

T. P. Guilderson

University of California, Santa Cruz

Kristine L. DeLong

Louisiana State University

Amos Winter

Indiana State University

A. Khare

University of Maryland Center for Environmental Science

Jens Zinke

University of Leicester

Chuan‐Chou Shen

National Taiwan University

Johan Nyberg

Geological Survey of Sweden

Cooperative Institutions

University of Arizona

Columbia University

Centre National de la Recherche Scientifique

University of Minnesota

University of Maryland Center for Environmental Science

University of Bern

Lamont-Doherty Earth Observatory

National Taiwan University

Woods Hole Oceanographic Institution

National Oceanic and Atmospheric Administration

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Testing coral-based tropical cyclone reconstructions: An example from Puerto Rico

Palaeogeography Palaeoclimatology Palaeoecology (2011)

K. Halimeda Kilbourne Ryan P. Moyer Terrence M. Quinn Andréa G. Grottoli

Tropical cyclone scales

10.1016/j.palaeo.2011.04.027

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Apparently Seasonal Variations of the Seawater Sr/Ca Ratio Across the Florida Keys Reef Tract

Geochemistry Geophysics Geosystems (2023)

A. Khare Hunter Hughes Johan Schijf K. Halimeda Kilbourne

Abstract A 4‐year time‐series of surface seawater Sr/Ca ratios was assembled across a section of the Florida Keys Reef Tract, in order to uncover any variability that might explain previously reported anomalies in regional calibrations of the coral aragonite Sr/Ca paleotemperature proxy. Samples were collected semiannually on a grid of 54 sites, from September of 2016 until January of 2020. The 325‐km 2 grid extended from the ocean shore to the forereef wall and from the east end of Long Key to the west end of Marathon. A novel ICP‐AES method was used to measure the Sr/Ca ratio, with ratio calibration and normalization against an in‐house seawater reference, yielding a long‐term precision of better than 0.2%. Significant variations (2%–3%) of the seawater Sr/Ca ratio were found. While it was relatively constant offshore, near the coast the ratio alternated seasonally between higher and lower values, generally resulting in seaward Sr/Ca gradients that were markedly negative in summer but reversed in winter. Inshore seawater Sr/Ca ratios ranged from a summer high of 8.83 mmol/mol to a winter low of 8.54 mmol/mol, the difference corresponding to a potential bias of ∼5.5°C in terms of the coral Sr/Ca paleotemperature proxy. This seasonal variation should diminish the slope of empirical Sr/Ca–SST calibration lines, as has indeed been observed in prior studies with local coral species. Open ocean samples obtained from the Atlantic, Indian, and Pacific enlarge the published Sr/Ca data set for surface seawater and show a much smaller variability of 8.646 ± 0.018 mmol/mol (0.2%).

10.1029/2022gc010728

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Atlantic circulation change still uncertain

Nature Geoscience (2022)

K. Halimeda Kilbourne Alan D. Wanamaker Paola Moffa‐Sánchez David J. Reynolds Daniel E. Amrhein

Circulation (fluid dynamics)

10.1038/s41561-022-00896-4

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Citations (82)

Carbon stable isotope record in the coral species Siderastrea stellata: A link to the Suess Effect in the tropical South Atlantic Ocean

Palaeogeography Palaeoclimatology Palaeoecology (2018)

Natan Silva Pereira Alcídes N. Sial K. Halimeda Kilbourne S.-C. Liu Chuan‐Chou Shen

Atoll

10.1016/j.palaeo.2018.02.007

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Evaluation of Sr/Ca-based paleoclimate reconstructions in modern and Medieval Diploria strigosa corals in the northeastern Caribbean

AGU Fall Meeting Abstracts (2013)

Yingfeng Xu S. P. Pearson K. Halimeda Kilbourne

Paleoclimatology

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SPCZ- and ENSO-related Salinity Variations Recorded in the Skeletal Geochemistry of a Porites Coral from Espiritu Santo, Vanuatu

AGU Fall Meeting Abstracts (2003)

K. Halimeda Kilbourne Terrence M. Quinn F. W. Taylor Thierry Delcroix Yves Gouriou

Porites

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Counteractive effects of increased temperature and pCO2 on the thickness and chemistry of the carapace of juvenile blue crab, Callinectes sapidus, from the Patuxent River, Chesapeake Bay

Journal of Experimental Marine Biology and Ecology (2017)

Hillary L. Glandon K. Halimeda Kilbourne Johan Schijf Thomas J. Miller

Callinectes

pCO2

10.1016/j.jembe.2017.11.005

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Citations (28)

Decadal- to interannual-scale source water variations in the Caribbean Sea recorded by Puerto Rican coral radiocarbon

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2006)

K. Halimeda Kilbourne Terrence M. Quinn T. P. Guilderson R. S. Webb Frederick W. Taylor

Water that forms the Florida Current, and eventually the Gulf Stream, coalesces in the Caribbean from both subtropical and equatorial sources. The equatorial sources are made up of, in part, South Atlantic water moving northward and compensating for southward flow at depth related to meridional overturning circulation. Subtropical surface water contains relatively high amounts of radiocarbon ({sup 14}C), whereas equatorial waters are influenced by the upwelling of low {sup 14}C water and have relatively low concentrations of {sup 14}C. We use a 250-year record of {Delta}{sup 14}C in a coral from southwestern Puerto Rico along with previously published coral {Delta}{sup 14}C records as tracers of subtropical and equatorial water mixing in the northern Caribbean. Data generated in this study and from other studies indicate that the influence of either of the two water masses can change considerably on interannual to interdecadal time scales. Variability due to ocean dynamics in this region is large relative to variability caused by atmospheric {sup 14}C changes, thus masking the Suess effect at this site. A mixing model produced using coral {Delta}{sup 14}C illustrates the time varying proportion of equatorial versus subtropical waters in the northern Caribbean between 1963 and 1983. The results of the model are consistent with linkages between multidecadal thermal variability in the North Atlantic and meridional overturning circulation. Ekman transport changes related to tradewind variability are proposed as a possible mechanism to explain the observed switches between relatively low and relatively high {Delta}{sup 14}C values in the coral radiocarbon records.

Puerto rican

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Exploring two centuries of the science of water

Physics Today (2020)

K. Halimeda Kilbourne

10.1063/pt.3.4475

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The Thermohaline Circulation and Tropical Cyclones in Past, Present, and Future Climates

Bulletin of the American Meteorological Society (2009)

J. Done Aixue Hu E. Christa Farmer Jianjun Yin Susan E. Bates

National Center for Atmospheric Research, Boulder, ColoradoHofstra University, Hempstead, New YorkThe Florida State University, Tallahassee, FloridaUniversity of Washington, Seattle, WashingtonBoston College, Chestnut Hill, MassachusettsNASAJPL, California Institute of Technology, Pasadena, CaliforniaMcDaniel College, Westminster, MarylandThe Pennsylvania State University, University Park, PennsylvaniaMIT/WHOI Joint Program, Woods Hole, MassachusettsCORRESPONDING AUTHOR: James M. Done, National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000, E-mail: done@ucar@edu

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10.1175/2009bams2762.1

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Citations (11)