Reconstructing the Upper Water Column Thermal Structure in the Atlantic Ocean
The thermal structure of the upper ocean (0–1000 m) is set by surface heat fluxes, shallow wind-driven circulation, and the deeper thermohaline circulation. Its long-term variability can be reconstructed using deep-dwelling planktonic foraminifera that record subsurface conditions. Here we used six...
Main Authors: | , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
John Wiley and Sons, Inc
2014
|
Subjects: | |
Online Access: | https://doi.org/10.7916/D8668B5C |
id |
ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/D8668B5C |
---|---|
record_format |
openpolar |
spelling |
ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/D8668B5C 2023-05-15T18:00:59+02:00 Reconstructing the Upper Water Column Thermal Structure in the Atlantic Ocean Cléroux, Caroline deMenocal, Peter B. Arbuszewski, Jennifer Linsley, Braddock 2014 https://doi.org/10.7916/D8668B5C English eng John Wiley and Sons, Inc https://doi.org/10.7916/D8668B5C Paleoclimatology Marine ecology Chemical oceanography Articles 2014 ftcolumbiauniv https://doi.org/10.7916/D8668B5C 2019-04-04T08:10:30Z The thermal structure of the upper ocean (0–1000 m) is set by surface heat fluxes, shallow wind-driven circulation, and the deeper thermohaline circulation. Its long-term variability can be reconstructed using deep-dwelling planktonic foraminifera that record subsurface conditions. Here we used six species (Neogloboquadrina dutertrei, Globorotalia tumida, Globorotalia inflata, Globorotalia truncatulinoides, Globorotalia hirsuta, and Globorotalia crassaformis) from 66 core tops along a meridional transect spanning the mid-Atlantic (42°N to 25°S) to develop a method for reconstructing past thermocline conditions. We estimated the calcification depths from δ18O measurements and the Mg/Ca-temperature relationships for each species. This systematic strategy over this large latitudinal section reveals distinct populations with different Mg/Ca-temperature relationships for G. inflata, G. truncatulinoides, and G. hirsuta in different areas. The calcification depths do not differ among the different populations, except for G. hirsuta, where the northern population calcifies much shallower than the southern population. N. dutertrei and G. tumida show a remarkably constant calcification depth independent of oceanographic conditions. The deepest dweller, G. crassaformis, apparently calcifies in the oxygen-depleted zone, where it may find refuge from predators and abundant aggregated matter to feed on. We found a good match between its calcification depth and the 3.2 ml/l oxygen level. The results of this multispecies, multiproxy study can now be applied down-core to facilitate the reconstruction of open-ocean thermocline changes in the past. Article in Journal/Newspaper Planktonic foraminifera Columbia University: Academic Commons |
institution |
Open Polar |
collection |
Columbia University: Academic Commons |
op_collection_id |
ftcolumbiauniv |
language |
English |
topic |
Paleoclimatology Marine ecology Chemical oceanography |
spellingShingle |
Paleoclimatology Marine ecology Chemical oceanography Cléroux, Caroline deMenocal, Peter B. Arbuszewski, Jennifer Linsley, Braddock Reconstructing the Upper Water Column Thermal Structure in the Atlantic Ocean |
topic_facet |
Paleoclimatology Marine ecology Chemical oceanography |
description |
The thermal structure of the upper ocean (0–1000 m) is set by surface heat fluxes, shallow wind-driven circulation, and the deeper thermohaline circulation. Its long-term variability can be reconstructed using deep-dwelling planktonic foraminifera that record subsurface conditions. Here we used six species (Neogloboquadrina dutertrei, Globorotalia tumida, Globorotalia inflata, Globorotalia truncatulinoides, Globorotalia hirsuta, and Globorotalia crassaformis) from 66 core tops along a meridional transect spanning the mid-Atlantic (42°N to 25°S) to develop a method for reconstructing past thermocline conditions. We estimated the calcification depths from δ18O measurements and the Mg/Ca-temperature relationships for each species. This systematic strategy over this large latitudinal section reveals distinct populations with different Mg/Ca-temperature relationships for G. inflata, G. truncatulinoides, and G. hirsuta in different areas. The calcification depths do not differ among the different populations, except for G. hirsuta, where the northern population calcifies much shallower than the southern population. N. dutertrei and G. tumida show a remarkably constant calcification depth independent of oceanographic conditions. The deepest dweller, G. crassaformis, apparently calcifies in the oxygen-depleted zone, where it may find refuge from predators and abundant aggregated matter to feed on. We found a good match between its calcification depth and the 3.2 ml/l oxygen level. The results of this multispecies, multiproxy study can now be applied down-core to facilitate the reconstruction of open-ocean thermocline changes in the past. |
format |
Article in Journal/Newspaper |
author |
Cléroux, Caroline deMenocal, Peter B. Arbuszewski, Jennifer Linsley, Braddock |
author_facet |
Cléroux, Caroline deMenocal, Peter B. Arbuszewski, Jennifer Linsley, Braddock |
author_sort |
Cléroux, Caroline |
title |
Reconstructing the Upper Water Column Thermal Structure in the Atlantic Ocean |
title_short |
Reconstructing the Upper Water Column Thermal Structure in the Atlantic Ocean |
title_full |
Reconstructing the Upper Water Column Thermal Structure in the Atlantic Ocean |
title_fullStr |
Reconstructing the Upper Water Column Thermal Structure in the Atlantic Ocean |
title_full_unstemmed |
Reconstructing the Upper Water Column Thermal Structure in the Atlantic Ocean |
title_sort |
reconstructing the upper water column thermal structure in the atlantic ocean |
publisher |
John Wiley and Sons, Inc |
publishDate |
2014 |
url |
https://doi.org/10.7916/D8668B5C |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
https://doi.org/10.7916/D8668B5C |
op_doi |
https://doi.org/10.7916/D8668B5C |
_version_ |
1766170279470432256 |