238U decay series nuclides in the northeastern Arabian Sea: Scavenging rates and cycling processes

Uranium in the Arabian Sea: role of denitrification in controlling its distribution

“…Regression analysis of data shows an overall increase in uranium concentration within the salinity range sampled (Fig. 2), consistent with that reported earlier for the Arabian Sea and other oceanic regions (Ku et al, 1977;Sarin et al, 1992Sarin et al, , 1994. The mean 234 U/ 238 U activity ratio of the samples is 1.14 ± 0.02 (n = 61) quite similar to those reported for other oceanic regions (op.…”

Uranium in the Arabian Sea: role of denitrification in controlling its distribution

“…Regression analysis of data shows an overall increase in uranium concentration within the salinity range sampled (Fig. 2), consistent with that reported earlier for the Arabian Sea and other oceanic regions (Ku et al, 1977;Sarin et al, 1992Sarin et al, , 1994. The mean 234 U/ 238 U activity ratio of the samples is 1.14 ± 0.02 (n = 61) quite similar to those reported for other oceanic regions (op.…”

210Po and 210Pb distribution, dissolved-particulate exchange rates, and particulate export along the North Atlantic US GEOTRACES GA03 section

“…In addition, the averaged large particle mass concentration over the deep water column indicates that it is the lowest at station USGT11-20 and the highest at station USGT10-01 (1.1 70.2 and 117 5 mg L À 1 , respectively, , supporting the fact that the concentration of large particulate matter (and thereby large particle flux) may in part be involved in the overall disequilibrium between 210 Po and 210 Pb in the deep water column. It is also worth noting that the 210 Po deficiency at depth is particularly evident at station USGT10-09, with high productivity at the surface and OMZ in the subsurface, similar to what was reported by Sarin et al (1994) and Thomson and Turekian (1976). Although we still cannot fully explain the deficit of 210 Po in deep water there is evidence that both local particle scavenging and high surface productivity related phenomenon are involved.…”

Comparative Geochemistry of 234Th, 210Pb, and 210Po: A Case Study in the Hung-Tsai Trough off Southwestern Taiwan

“…The POC/PPo ra tio is 100 ~ 300 mmol dpm -1 in the mixed layer, which is com pa ra ble with the ra tio in trap par ti cles col lected in the equa to rial Pa cific (Murray et al 2005). The av er age POC/PTh and POC/PPo of 6 and 150 mmol dpm (Sarin et al 1994). Murray et al (2005) found ex port based on 210 Po is higher than that based on 234 Th also by a fac tor of 2 in the equa to rial Pa cific.…”

Uranium in the Arabian Sea: role of denitrification in controlling its distribution

“…Regression analysis of data shows an overall increase in uranium concentration within the salinity range sampled (Fig. 2), consistent with that reported earlier for the Arabian Sea and other oceanic regions (Ku et al, 1977;Sarin et al, 1992Sarin et al, , 1994. The mean 234 U/ 238 U activity ratio of the samples is 1.14 ± 0.02 (n = 61) quite similar to those reported for other oceanic regions (op.…”

210Po and 210Pb distribution, dissolved-particulate exchange rates, and particulate export along the North Atlantic US GEOTRACES GA03 section

“…In addition, the averaged large particle mass concentration over the deep water column indicates that it is the lowest at station USGT11-20 and the highest at station USGT10-01 (1.1 70.2 and 117 5 mg L À 1 , respectively, , supporting the fact that the concentration of large particulate matter (and thereby large particle flux) may in part be involved in the overall disequilibrium between 210 Po and 210 Pb in the deep water column. It is also worth noting that the 210 Po deficiency at depth is particularly evident at station USGT10-09, with high productivity at the surface and OMZ in the subsurface, similar to what was reported by Sarin et al (1994) and Thomson and Turekian (1976). Although we still cannot fully explain the deficit of 210 Po in deep water there is evidence that both local particle scavenging and high surface productivity related phenomenon are involved.…”

Comparative Geochemistry of 234Th, 210Pb, and 210Po: A Case Study in the Hung-Tsai Trough off Southwestern Taiwan

“…The POC/PPo ra tio is 100 ~ 300 mmol dpm -1 in the mixed layer, which is com pa ra ble with the ra tio in trap par ti cles col lected in the equa to rial Pa cific (Murray et al 2005). The av er age POC/PTh and POC/PPo of 6 and 150 mmol dpm (Sarin et al 1994). Murray et al (2005) found ex port based on 210 Po is higher than that based on 234 Th also by a fac tor of 2 in the equa to rial Pa cific.…”

Uranium in the Arabian Sea: role of denitrification in controlling its distribution

“…Regression analysis of data shows an overall increase in uranium concentration within the salinity range sampled (Fig. 2), consistent with that reported earlier for the Arabian Sea and other oceanic regions (Ku et al, 1977;Sarin et al, 1992Sarin et al, , 1994. The mean 234 U/ 238 U activity ratio of the samples is 1.14 ± 0.02 (n = 61) quite similar to those reported for other oceanic regions (op.…”

210Po and 210Pb distribution, dissolved-particulate exchange rates, and particulate export along the North Atlantic US GEOTRACES GA03 section

“…In addition, the averaged large particle mass concentration over the deep water column indicates that it is the lowest at station USGT11-20 and the highest at station USGT10-01 (1.1 70.2 and 117 5 mg L À 1 , respectively, , supporting the fact that the concentration of large particulate matter (and thereby large particle flux) may in part be involved in the overall disequilibrium between 210 Po and 210 Pb in the deep water column. It is also worth noting that the 210 Po deficiency at depth is particularly evident at station USGT10-09, with high productivity at the surface and OMZ in the subsurface, similar to what was reported by Sarin et al (1994) and Thomson and Turekian (1976). Although we still cannot fully explain the deficit of 210 Po in deep water there is evidence that both local particle scavenging and high surface productivity related phenomenon are involved.…”

Comparative Geochemistry of 234Th, 210Pb, and 210Po: A Case Study in the Hung-Tsai Trough off Southwestern Taiwan

“…The POC/PPo ra tio is 100 ~ 300 mmol dpm -1 in the mixed layer, which is com pa ra ble with the ra tio in trap par ti cles col lected in the equa to rial Pa cific (Murray et al 2005). The av er age POC/PTh and POC/PPo of 6 and 150 mmol dpm (Sarin et al 1994). Murray et al (2005) found ex port based on 210 Po is higher than that based on 234 Th also by a fac tor of 2 in the equa to rial Pa cific.…”