
TY  - JOUR
A1  - Towler, Philip H. 
A1  - Smith, J. David 
T1  - Distribution of <emph type="7">226</emph>Ra and <emph type="7">210</emph>Pb in the mixed layer of the western equatorial Pacific Ocean
JF  - Marine and Freshwater Research
JO  - Mar. Freshwater Res.
Y1  - 1997
VL  - 48
IS  - 5
SP  - 371
EP  - 375
KW  - 
UR  - https://doi.org/10.1071/MF96095 
N2  - The residence time of particulate and dissolved 210Pb in the upper layer of the western equatorial Pacific Ocean is examined. Activities of dissolved 226Ra, dissolved and particulate 210Pb, and particulate 210Po were determined to a depth of 300 m in a series of depth profiles collected along a transect across the equator at 155&#x02DA;E in November 1993. Total 210Pb in the surface water decreased from 2&#183;7 Bq m-3 at 10&#x02DA;N to 1&#183;8 Bq m-3 at 10&#x02DA;S. Dissolved 210Pb generally decreased with depth but showed subsurface (100&#8211;150 m) maxima at 10&#x02DA;N and 5&#x02DA;N. The nutrient concentrations at 300 m were highest at these stations, suggesting some degree of upwelling. Calculations indicate that the residence times of dissolved (&#60;0&#183;45 &#181;m) and particulate (&#62;0&#183;45 &#181;m) 210Pb in the top 300 m were 4&#183;6&#8211;9&#183;6 years and 0&#183;15&#8211;0&#183;29 year respectively. 
ER  -

