Radium_Summary

Dataset description

Radium isotope data summaries from AMLR and NBP cruises to the Antarctic in 2006

Cruises

Associated Publications

Brzezinski, M.A., Nelson, D.M., Franck, V.M. and Sigmon, D.E., 2001. "Silicon dynamics within an intense open-ocean diatom bloom in the pacific sector of the southern ocean." Deep-Sea Research Part II 48, pp. 3997–4018

Michiel Rutgers van der Loeff, Manmohan M. Sarin, Mark Baskaran, Claudia Benitez-Nelson, Ken O. Buesseler, Matt Charette, Minhan Dai, Örjan Gustafsson, Pere Masque, Paul J. Morris, Kent Orlandini, Alessia Rodriguez y Baena, Nicolas Savoye, Sabine Schmidt, Robert Turnewitsch, Ingrid Vöge, James T. Waples. "A review of present techniques and methodological advances in analyzing 234Th in aquatic systems" Marine Chemistry, Volume 100, Issues 3-4, 1 August 2006, Pages 190-212

Pike, S.M., K.O. Buesseler, J. Andrews and N. Savoye, 2005. "Quantification of 234Th recovery in small volume sea water samples by inductively coupled plasma mass spectrometry." (PDF) Journal of Radioanalytical and Nuclear Chemistry, 263(2): 355-360.

Willard S. Moore and Ralph Arnold (1996). "Measurement of 223Ra and 224Ra in coastal waters using a delayed coincidence counter." Journal of Geophysical Research, vol. 101, no. c1, pages 1321-1329, January 15, 1996.

Acquisition description

Sampling and Analytical Methodology

Surface water samples were collected from the ships clean water intake (AMLR and NBP), and measured for 223Ra and 224Ra activities following standard methods of extraction and delayed coincidence counting (Moore and Arnold, 1996). 300 liters was collected per sample on the AMLR cruise while 558 liters of water was collected during the winter NBP cruise. Ra isotopes were extracted at sea onto manganese oxide-impregnated acrylic fiber at flow rates less than 1 L per minute. Recovery rates have been shown to be greater than 95%. The Mn-fiber was rinsed with deionized water, partially dried, and analyzed for 223Ra and 224Ra using the RaDeCC delayed coincidence counter. Moore and Arnold, 1996 W.S. Moore and R. Arnold, Measurement of Ra-223 and Ra-224 in coastal waters using a delayed coincidence counter, Journal of Geophysical Research — Oceans 101 (C1) (1996), pp. 1321–1329. Full Text via CrossRef | View Record in Scopus | Cited By in Scopus (89) Long-lived isotopes (226Ra, 228Ra) were subsequently determined through measurement on a Canaberra gamma detector. This was conducted on the same fibers after they were ashed in a muffle furnace. The detector was calibrated using Mn-fiber standards prepared in the same geometry as the samples .

Processing description

Data Processing

Modifications to original data made to conform to BCO-DMO database convention

Cruise_ID added
+/- columns eliminated and error served as separate column for each data type
empty cells filled with "nd" (no data)
Latitude/Longitude headers converted to lat/lon
date reformatted to YYYYMMDD
time reformatted to HHMM
decimal data values padded to consistent decimal places

1. CTD profiler:

   Shipboard CTD

2. Pump -underway ship intake:

   Ship's clean water intake

3. Large Volume Pumping System -WTS-LV:

   McLane WTS-LV Large Volume, High Accuracy, Oceanographic Sampling Pump

This document is created from the content of the BCO-DMO metadata database.    2010-09-02  21:32:08