Radon profiles in the Indonesian archipelago |
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| Institution: | 1. Servicio de Oftalmología, Hospital Clínico San Carlos, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IdISSC), Madrid, España;2. Servicio de Oftalmología, Hospital Clínico San Carlos, Instituto de Investigaciones Oftalmológicas Ramón Castroviejo, Departamento de Inmunología, Oftalmología y ORL, Facultad de Medicina, Universidad Complutense de Madrid, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IdISSC), Madrid, España;1. Graduate School of Science and Engineering, Doshisha University, Japan;2. Department of Environmental Systems Sciences, Doshisha University, Japan;3. Research Center for Geotechnology, Indonesian Institute of Sciences (LIPI), Indonesia;1. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518055, China;2. LAY-OUT Planning Consultants Co., Ltd., TAGEN Knowledge & Innovation Center, Shenzhen 518034, China;1. College of Earth Science, Northeast Petroleum University, Daqing 163318, China;2. Ministry of Education Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Northeast Petroleum University, Daqing 163318, China;3. Exploration and Development Research Institute, Daqing Oilfield Company Ltd., Daqing 163712, China;4. Heilongjiang Institute of Technology, Ha''erbin 150050, China;1. Gaziantep Islam Science and Technology University, Faculty of Health Sciences, Gaziantep, Turkey;2. Gaziantep University, Faculty of Health Sciences, Gaziantep, Turkey |
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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 from 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 amount 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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