Generation, Transport, and Preservation of the Alkenone-Based strongUsub37/subsupK'/sup/strong Sea Surface Temperature Index in the Water Column and Sediments of the Cariaco Basin (Venezuela)

Miguel A. Goni; Mark P. Woodworth; Heather L. Aceves; Robert C. Thunell; Eric Tappa; David Black; Frank E. Muller-Karger; Yrene Astor; Ramon Varela

doi:10.1029/2003GB002132

Generation, Transport, and Preservation of the Alkenone-Based strongUsub37/subsupK'/sup/strong Sea Surface Temperature Index in the Water Column and Sediments of the Cariaco Basin (Venezuela)

Miguel A. Goni
, Mark P. Woodworth
, Heather L. Aceves
, Robert C. Thunell
, Eric Tappa
, David Black
, Frank E. Muller-Karger
, Yrene Astor
, Ramon Varela

University of South Florida

Research output: Contribution to journal › Article › peer-review

Abstract

Alkenone fluxes in the water column of the Cariaco Basin ranged from 12 to 20 μg m −2 d −1 and were inversely related to upwelling strength. The U 37 K′ ratios of sinking particles varied from 0.78 to 0.96 and exhibited seasonal changes that were coherent with a 7°C variation in sea surface temperature (SST). The correlation between SST and U 37 K′ ratios closely overlapped with the calibration of <a href="https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2003GB002132#gbc1043-bib-0047"> Prahl et al. [1988] </a> . Alkenone burial fluxes in Cariaco Basin sediments varied markedly over the past &sim;6000 years, ranging from 0.2 to 5 μg m −2 d −1 . The U 37 K′ ratios of surface sediments indicate SST was higher (26.3°C) during the last 50 years of deposition than in the previous 300 years (&sim;25°C), signaling an upwelling decrease in the latter part of the twentieth century. The lowest U 37 K′ &hyphen;derived temperatures (&sim;25°C) were measured in sediments deposited during the little ice age (LIA). These compositions, coupled with relatively low alkenone fluxes (≤2 μg m −2 d −1 ), are consistent with conditions of enhanced upwelling, decreased SST and reduced haptophyte production. The highest U 37 K′ &hyphen;derived SST estimates (over 26.5°C) were measured during the Medieval Warm Period (MWP) and suggest reduced upwelling at this time. Prior to the MWP, the alkenone record indicates temperatures of &sim;26°C and burial fluxes of &sim;2 μg m −2 d −1 . These compositions indicate stronger upwelling conditions during the Holocene relative to the last 50 years and the MWP but annual SSTs above those estimated for the LIA.

Original language	American English
Journal	Global Biogeochemical Cycles
Volume	18
DOIs	https://doi.org/10.1029/2003GB002132
State	Published - Jun 1 2004

Keywords

alkenones
U37K' Index
SST
sediment traps
marine Sediments
Cariaco Basin
(10 degrees 30 ' N
64 degrees 40 ' W)

Disciplines

Life Sciences
Marine Biology

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10.1029/2003GB002132License: CC BY

Generation Transport and Preservation of the Alkenone-Based stFinal published version, 863 KBLicense: CC BY

Cite this

Goni, M. A., Woodworth, M. P., Aceves, H. L., Thunell, R. C., Tappa, E., Black, D., Muller-Karger, F. E., Astor, Y., & Varela, R. (2004). Generation, Transport, and Preservation of the Alkenone-Based strongUsub37/subsupK'/sup/strong Sea Surface Temperature Index in the Water Column and Sediments of the Cariaco Basin (Venezuela). Global Biogeochemical Cycles, 18. https://doi.org/10.1029/2003GB002132

Generation, Transport, and Preservation of the Alkenone-Based strongUsub37/subsupK'/sup/strong Sea Surface Temperature Index in the Water Column and Sediments of the Cariaco Basin (Venezuela). / Goni, Miguel A.; Woodworth, Mark P.; Aceves, Heather L. et al.
In: Global Biogeochemical Cycles, Vol. 18, 01.06.2004.

Research output: Contribution to journal › Article › peer-review

Goni, MA, Woodworth, MP, Aceves, HL, Thunell, RC, Tappa, E, Black, D, Muller-Karger, FE, Astor, Y & Varela, R 2004, 'Generation, Transport, and Preservation of the Alkenone-Based strongUsub37/subsupK'/sup/strong Sea Surface Temperature Index in the Water Column and Sediments of the Cariaco Basin (Venezuela)', Global Biogeochemical Cycles, vol. 18. https://doi.org/10.1029/2003GB002132

@article{f35d8cea8752430bbd54b15816680bde,

title = "Generation, Transport, and Preservation of the Alkenone-Based strongUsub37/subsupK'/sup/strong Sea Surface Temperature Index in the Water Column and Sediments of the Cariaco Basin (Venezuela)",

abstract = " Alkenone fluxes in the water column of the Cariaco Basin ranged from 12 to 20 \μg m \−2 d \−1 and were inversely related to upwelling strength. The U 37 K\′ ratios of sinking particles varied from 0.78 to 0.96 and exhibited seasonal changes that were coherent with a 7\°C variation in sea surface temperature (SST). The correlation between SST and U 37 K\′ ratios closely overlapped with the calibration of Prahl et al. [1988] . Alkenone burial fluxes in Cariaco Basin sediments varied markedly over the past \&sim;6000 years, ranging from 0.2 to 5 \μg m \−2 d \−1 . The U 37 K\′ ratios of surface sediments indicate SST was higher (26.3\°C) during the last 50 years of deposition than in the previous 300 years (\&sim;25\°C), signaling an upwelling decrease in the latter part of the twentieth century. The lowest U 37 K\′ \&hyphen;derived temperatures (\&sim;25\°C) were measured in sediments deposited during the little ice age (LIA). These compositions, coupled with relatively low alkenone fluxes (\≤2 \μg m \−2 d \−1 ), are consistent with conditions of enhanced upwelling, decreased SST and reduced haptophyte production. The highest U 37 K\′ \&hyphen;derived SST estimates (over 26.5\°C) were measured during the Medieval Warm Period (MWP) and suggest reduced upwelling at this time. Prior to the MWP, the alkenone record indicates temperatures of \&sim;26\°C and burial fluxes of \&sim;2 \μg m \−2 d \−1 . These compositions indicate stronger upwelling conditions during the Holocene relative to the last 50 years and the MWP but annual SSTs above those estimated for the LIA.",

keywords = "alkenones, U37K' Index, SST, sediment traps, marine Sediments, Cariaco Basin, (10 degrees 30 ' N, 64 degrees 40 ' W)",

author = "Goni, \{Miguel A.\} and Woodworth, \{Mark P.\} and Aceves, \{Heather L.\} and Thunell, \{Robert C.\} and Eric Tappa and David Black and Muller-Karger, \{Frank E.\} and Yrene Astor and Ramon Varela",

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doi = "10.1029/2003GB002132",

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volume = "18",

journal = "Global Biogeochemical Cycles",

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TY - JOUR

T1 - Generation, Transport, and Preservation of the Alkenone-Based strongUsub37/subsupK'/sup/strong Sea Surface Temperature Index in the Water Column and Sediments of the Cariaco Basin (Venezuela)

AU - Goni, Miguel A.

AU - Woodworth, Mark P.

AU - Aceves, Heather L.

AU - Thunell, Robert C.

AU - Tappa, Eric

AU - Black, David

AU - Muller-Karger, Frank E.

AU - Astor, Yrene

AU - Varela, Ramon

PY - 2004/6/1

Y1 - 2004/6/1

N2 - Alkenone fluxes in the water column of the Cariaco Basin ranged from 12 to 20 μg m −2 d −1 and were inversely related to upwelling strength. The U 37 K′ ratios of sinking particles varied from 0.78 to 0.96 and exhibited seasonal changes that were coherent with a 7°C variation in sea surface temperature (SST). The correlation between SST and U 37 K′ ratios closely overlapped with the calibration of Prahl et al. [1988] . Alkenone burial fluxes in Cariaco Basin sediments varied markedly over the past &sim;6000 years, ranging from 0.2 to 5 μg m −2 d −1 . The U 37 K′ ratios of surface sediments indicate SST was higher (26.3°C) during the last 50 years of deposition than in the previous 300 years (&sim;25°C), signaling an upwelling decrease in the latter part of the twentieth century. The lowest U 37 K′ &hyphen;derived temperatures (&sim;25°C) were measured in sediments deposited during the little ice age (LIA). These compositions, coupled with relatively low alkenone fluxes (≤2 μg m −2 d −1 ), are consistent with conditions of enhanced upwelling, decreased SST and reduced haptophyte production. The highest U 37 K′ &hyphen;derived SST estimates (over 26.5°C) were measured during the Medieval Warm Period (MWP) and suggest reduced upwelling at this time. Prior to the MWP, the alkenone record indicates temperatures of &sim;26°C and burial fluxes of &sim;2 μg m −2 d −1 . These compositions indicate stronger upwelling conditions during the Holocene relative to the last 50 years and the MWP but annual SSTs above those estimated for the LIA.

AB - Alkenone fluxes in the water column of the Cariaco Basin ranged from 12 to 20 μg m −2 d −1 and were inversely related to upwelling strength. The U 37 K′ ratios of sinking particles varied from 0.78 to 0.96 and exhibited seasonal changes that were coherent with a 7°C variation in sea surface temperature (SST). The correlation between SST and U 37 K′ ratios closely overlapped with the calibration of Prahl et al. [1988] . Alkenone burial fluxes in Cariaco Basin sediments varied markedly over the past &sim;6000 years, ranging from 0.2 to 5 μg m −2 d −1 . The U 37 K′ ratios of surface sediments indicate SST was higher (26.3°C) during the last 50 years of deposition than in the previous 300 years (&sim;25°C), signaling an upwelling decrease in the latter part of the twentieth century. The lowest U 37 K′ &hyphen;derived temperatures (&sim;25°C) were measured in sediments deposited during the little ice age (LIA). These compositions, coupled with relatively low alkenone fluxes (≤2 μg m −2 d −1 ), are consistent with conditions of enhanced upwelling, decreased SST and reduced haptophyte production. The highest U 37 K′ &hyphen;derived SST estimates (over 26.5°C) were measured during the Medieval Warm Period (MWP) and suggest reduced upwelling at this time. Prior to the MWP, the alkenone record indicates temperatures of &sim;26°C and burial fluxes of &sim;2 μg m −2 d −1 . These compositions indicate stronger upwelling conditions during the Holocene relative to the last 50 years and the MWP but annual SSTs above those estimated for the LIA.

KW - alkenones

KW - U37K' Index

KW - SST

KW - sediment traps

KW - marine Sediments

KW - Cariaco Basin

KW - (10 degrees 30 ' N

KW - 64 degrees 40 ' W)

UR - https://digitalcommons.usf.edu/msc_facpub/59

U2 - 10.1029/2003GB002132

DO - 10.1029/2003GB002132

M3 - Article

VL - 18

JO - Global Biogeochemical Cycles

JF - Global Biogeochemical Cycles

ER -

Generation, Transport, and Preservation of the Alkenone-Based strongUsub37/subsupK'/sup/strong Sea Surface Temperature Index in the Water Column and Sediments of the Cariaco Basin (Venezuela)

Abstract

Keywords

Disciplines

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