TY - JOUR
T1 - The distribution of radiocesium in the Indian ocean and its relation to the exit passage of the Indonesian Throughflow
AU - Alkatiri, Ali
AU - Suseno, Heny
AU - Hudiyono, Sumi
AU - Moersidik, Setyo Sarwanto
N1 - Funding Information:
The research is supported by joint research between the Marine Research Institute of Marine Fisheries, the Ministry of Marine Affairs and Fisheries and BPPT, the Republic of Indonesia. The authors would like to express their gratitude to Mr. Yahya for his assistance during the laboratory sample analyses. We also thank the captain, officers, and crew members of the R/V Baruna Jaya IV for their collaboration in the sampling during the expedition in September to October 2015. We would like to extend special appreciation to the Indonesia Ministry of Research, Technology and Higher Education especially Saintek Scholarship program to support this research. The research is supported by joint research between Ministry of Maritime and Fisheries Affairs, Ministry of Research, Technology and Higher Education and Technology Center for Marine Survey, Agency for Assessment and Application of Technology.
Funding Information:
The research is supported by joint research between the Marine Research Institute of Marine Fisheries , the Ministry of Marine Affairs and Fisheries and BPPT , the Republic of Indonesia. The authors would like to express their gratitude to Mr. Yahya for his assistance during the laboratory sample analyses. We also thank the captain, officers, and crew members of the R/V Baruna Jaya IV for their collaboration in the sampling during the expedition in September to October 2015. We would like to extend special appreciation to the Indonesia Ministry of Research, Technology and Higher Education especially Saintek Scholarship program to support this research. The research is supported by joint research between Ministry of Maritime and Fisheries Affairs, Ministry of Research, Technology and Higher Education and Technology Center for Marine Survey, Agency for Assessment and Application of Technology .
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/1
Y1 - 2019/1
N2 - The objective of this study was to determine the presence of radiocesium (134Cs and 137Cs) at the monitoring sites and to link its presence to the characteristics and mass water dynamics at the exit of the Indonesian Throughflow (ITF). The main sources of radiocesium are from human activities in the North Pacific Sea, such as from global fallout and release from the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) reactor, and are potentially brought to Indonesian waters through the Indonesian Throughflow mechanism. Sea water samples were collected from the surface, thermocline, and deep layers during the expedition. The concentration of 137Cs on the surface was between 0.042–1.003 Bq m−3, the concentration range in the thermocline layer was 0.008–0.795 Bq m−3, and the concentration in the deep layer was 0.046–0.680 Bq m−3. The 134Cs concentration was below the detection limit, which indicates that the 137Cs comes from global fallout. In this research, the measurement of oceanographic parameters was also conducted, and the results showed that temperatures were in the range of 4.982–27.45 °C, salinity was in the range of 34.232–34.979 PSU, and the density was between 22.0979–27.4028 kg m−3. The salinity profile indicates that the eastern part had a lower salinity level than the western part. The Pacific Equatorial Water Mass was found to be the most dominant in the ITF. Furthermore, these oceanographic data were combined with 137Cs data to determine the distribution pattern of 137Cs both horizontally and vertically in the exit passage of the ITF.
AB - The objective of this study was to determine the presence of radiocesium (134Cs and 137Cs) at the monitoring sites and to link its presence to the characteristics and mass water dynamics at the exit of the Indonesian Throughflow (ITF). The main sources of radiocesium are from human activities in the North Pacific Sea, such as from global fallout and release from the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) reactor, and are potentially brought to Indonesian waters through the Indonesian Throughflow mechanism. Sea water samples were collected from the surface, thermocline, and deep layers during the expedition. The concentration of 137Cs on the surface was between 0.042–1.003 Bq m−3, the concentration range in the thermocline layer was 0.008–0.795 Bq m−3, and the concentration in the deep layer was 0.046–0.680 Bq m−3. The 134Cs concentration was below the detection limit, which indicates that the 137Cs comes from global fallout. In this research, the measurement of oceanographic parameters was also conducted, and the results showed that temperatures were in the range of 4.982–27.45 °C, salinity was in the range of 34.232–34.979 PSU, and the density was between 22.0979–27.4028 kg m−3. The salinity profile indicates that the eastern part had a lower salinity level than the western part. The Pacific Equatorial Water Mass was found to be the most dominant in the ITF. Furthermore, these oceanographic data were combined with 137Cs data to determine the distribution pattern of 137Cs both horizontally and vertically in the exit passage of the ITF.
KW - Fukushima
KW - Indonesian Throughflow
KW - Radiocesium
UR - http://www.scopus.com/inward/record.url?scp=85059658936&partnerID=8YFLogxK
U2 - 10.1016/j.rsma.2018.100496
DO - 10.1016/j.rsma.2018.100496
M3 - Article
AN - SCOPUS:85059658936
VL - 25
JO - Regional Studies in Marine Science
JF - Regional Studies in Marine Science
SN - 2352-4855
M1 - 100496
ER -