226Ra and Ba in northeast Atlantic deep water

Monika Rhein, Liu Heung Chan, Wolfgang Roether, Peter Schlosser

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

226Ra and Ba data are presented for the northeast Atlantic below 2000 m depth from a section of stations 8°S to 46°N obtained by F.S. Meteor in 1981. The precision of the 226Ra data (±1%) allows a resolution of structures in the 226Ra distribution that is comparable to the resolution for Ba and nutrients. Linear property-property correlations in the upper parts of the depth range appear to be uniform within the observational error along the section for 226Ra, Ba [Ba(nmol kg-1) = 3.88 Ra (dpm 100 kg-1) + 12.3], and alkalinity, whereas the slopes of these properties versus Si increase northwards from about 10 to 25 × 10-4 dpm Ra μmol Si-1. From this observation, and from studying the property distributions across the Romanche Fracture Zone, it is concluded that CaCO3 dissolution must be an important process of 226Ra and barium regeneration, while opal dissolution appears to be of minor importance. The water overflowing eastward over the sill of the Romanche Fracture Zone has 17.2 ± 0.3 dpm 100 kg-1 226Ra, 79.5 ± 1.5·nmol kg-1 Ba and 2338 ± 4 μeq kg-1 alkalinity. Within 800-1400 m above the sea floor, excess 226Ra relative to the linear correlation with Ba further up in the water column is generally present, but there is also a reflection of 226Ra decay at intermediate depths at the northern stations of the section. The latter effect appears to amount to only 3 ± 1.5%, but this magnitude is consistent with the 14C distribution reported previously (Schlitzer et al., Journal of Geophysical Research, 90, 6945-6952, 1985). From the excess 226Ra in the lowest 800-1400 m of the water column, the 226Ra flux from the sediments is estimated to be 7.7 ± 4 × 10-21 mol Ra (m2s)-1, a value in accordance with results by Cochran (Earth and Planetary Science Letters, 49, 381-392, 1980).

Original languageEnglish (US)
Pages (from-to)1541-1564
Number of pages24
JournalDeep Sea Research Part A, Oceanographic Research Papers
Volume34
Issue number9
DOIs
StatePublished - Jan 1 1987
Externally publishedYes

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deep water
fracture zone
alkalinity
water column
dissolution
opal
meteor
barium
sill
seafloor
regeneration
nutrient
sediment
distribution
water
station
effect
science

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

226Ra and Ba in northeast Atlantic deep water. / Rhein, Monika; Chan, Liu Heung; Roether, Wolfgang; Schlosser, Peter.

In: Deep Sea Research Part A, Oceanographic Research Papers, Vol. 34, No. 9, 01.01.1987, p. 1541-1564.

Research output: Contribution to journalArticle

Rhein, Monika ; Chan, Liu Heung ; Roether, Wolfgang ; Schlosser, Peter. / 226Ra and Ba in northeast Atlantic deep water. In: Deep Sea Research Part A, Oceanographic Research Papers. 1987 ; Vol. 34, No. 9. pp. 1541-1564.
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N2 - 226Ra and Ba data are presented for the northeast Atlantic below 2000 m depth from a section of stations 8°S to 46°N obtained by F.S. Meteor in 1981. The precision of the 226Ra data (±1%) allows a resolution of structures in the 226Ra distribution that is comparable to the resolution for Ba and nutrients. Linear property-property correlations in the upper parts of the depth range appear to be uniform within the observational error along the section for 226Ra, Ba [Ba(nmol kg-1) = 3.88 Ra (dpm 100 kg-1) + 12.3], and alkalinity, whereas the slopes of these properties versus Si increase northwards from about 10 to 25 × 10-4 dpm Ra μmol Si-1. From this observation, and from studying the property distributions across the Romanche Fracture Zone, it is concluded that CaCO3 dissolution must be an important process of 226Ra and barium regeneration, while opal dissolution appears to be of minor importance. The water overflowing eastward over the sill of the Romanche Fracture Zone has 17.2 ± 0.3 dpm 100 kg-1 226Ra, 79.5 ± 1.5·nmol kg-1 Ba and 2338 ± 4 μeq kg-1 alkalinity. Within 800-1400 m above the sea floor, excess 226Ra relative to the linear correlation with Ba further up in the water column is generally present, but there is also a reflection of 226Ra decay at intermediate depths at the northern stations of the section. The latter effect appears to amount to only 3 ± 1.5%, but this magnitude is consistent with the 14C distribution reported previously (Schlitzer et al., Journal of Geophysical Research, 90, 6945-6952, 1985). From the excess 226Ra in the lowest 800-1400 m of the water column, the 226Ra flux from the sediments is estimated to be 7.7 ± 4 × 10-21 mol Ra (m2s)-1, a value in accordance with results by Cochran (Earth and Planetary Science Letters, 49, 381-392, 1980).

AB - 226Ra and Ba data are presented for the northeast Atlantic below 2000 m depth from a section of stations 8°S to 46°N obtained by F.S. Meteor in 1981. The precision of the 226Ra data (±1%) allows a resolution of structures in the 226Ra distribution that is comparable to the resolution for Ba and nutrients. Linear property-property correlations in the upper parts of the depth range appear to be uniform within the observational error along the section for 226Ra, Ba [Ba(nmol kg-1) = 3.88 Ra (dpm 100 kg-1) + 12.3], and alkalinity, whereas the slopes of these properties versus Si increase northwards from about 10 to 25 × 10-4 dpm Ra μmol Si-1. From this observation, and from studying the property distributions across the Romanche Fracture Zone, it is concluded that CaCO3 dissolution must be an important process of 226Ra and barium regeneration, while opal dissolution appears to be of minor importance. The water overflowing eastward over the sill of the Romanche Fracture Zone has 17.2 ± 0.3 dpm 100 kg-1 226Ra, 79.5 ± 1.5·nmol kg-1 Ba and 2338 ± 4 μeq kg-1 alkalinity. Within 800-1400 m above the sea floor, excess 226Ra relative to the linear correlation with Ba further up in the water column is generally present, but there is also a reflection of 226Ra decay at intermediate depths at the northern stations of the section. The latter effect appears to amount to only 3 ± 1.5%, but this magnitude is consistent with the 14C distribution reported previously (Schlitzer et al., Journal of Geophysical Research, 90, 6945-6952, 1985). From the excess 226Ra in the lowest 800-1400 m of the water column, the 226Ra flux from the sediments is estimated to be 7.7 ± 4 × 10-21 mol Ra (m2s)-1, a value in accordance with results by Cochran (Earth and Planetary Science Letters, 49, 381-392, 1980).

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