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Radon profiles in the Indonesian archipelago
Berger, G.W.; Van Bennekom, A.J.; Kloosterhuis, H.J. (1988). Radon profiles in the Indonesian archipelago. Neth. J. Sea Res. 22(4): 395-402
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579; e-ISSN 1873-1406, meer
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| Auteurs | | Top |
- Berger, G.W.
- Van Bennekom, A.J., meer
- Kloosterhuis, H.J.
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| Abstract |
A series of near-bottom excess radon profiles was measured in the Indonesian archipelago during the Snellius-II Expedition. The results show considerable variations in structure, 222Rn concentrations and integrated excess 222Rn inventory in the water column. Near-bottom vertical eddy diffusion coefficients vary frorn 46.4 to 63.6 cm²·s-1 in the basins; they are in general much higher on slopes and sills. The standing crop (the integrated arnount of excess 222Rn) ranges from 0.9 to 49.6 dpm·cm-2. 226Radium supported 222Rn concentrations range from 9 to 3888·10-2 dpm·kg-1. Compared to mid-ocean basins the vertical mixing processes of near-bottom water masses in the Indonesian archipelago is fast, especially in the water layer from 50 to 200 m above the bottom, with diffusion coefficients in the order of 10 times higher than in the Pacific Ocean. With the exception of two stations standing crop values were comparable with those found in the Pacific Ocean but higher than those from the Atlantic Ocean. 210Pb analyses show high sedimentation rates, up to 75 cm·10-3·a -1. This does not agree with related standing crops. One explanation can be that erosion plays an important role on the sills and slopes. |
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