title: Atmospheric 14 C CO 2 variations in Japan during 1982--1999 based on 14 C measurements of rice grains.
abstract: (14)C in rice grains is a useful tracer of atmospheric (14)C(CO(2)). (14)C measurement in rice grains for 17 years during 1982--1999 reveals the following. There is negative correlation between Delta(14)C and the population densities of localities in Japan. Under-populated areas in the northern area of Japan and Okinawa remained clean in the 1990s. The (14)C(CO(2)) decline rates at those areas are near to that of Shauinsland. A latitudinal effect due to Chinese nuclear tests is observed in 1982. Small Seuss effects is observed at the middle latitudes in East Asia after 1995.
authors.affiliation: Research Center for Radiation and Radioisotopes, Osaka Prefecture University, 1-2 Gakuen-cho, Sakai, Osaka 5998570, Japan. sshibata60@yahoo.co.jp
authors.forename: Setsuko
authors.initials: S
authors.lastname: Shibata
authors.forename: Eiko
authors.initials: E
authors.lastname: Kawano
authors.forename: Takeshige
authors.initials: T
authors.lastname: Nakabayashi
mesh_terms: D000388:Air / Q000032:analysis*; D000396:Air Pollutants, Radioactive / Q000032:analysis*; D000465:Algorithms; D002245:Carbon Dioxide / Q000032:analysis*; D002250:Carbon Radioisotopes / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods; D007564:Japan; D012275:Oryza / Q000737:chemistry*; D011156:Population Density; D011829:Radiation Dosage; D011874:Radiometry / Q000379:methods; D012639:Seeds / Q000737:chemistry*; D013223:Statistics as Topic
chemical_list: D000396:Air Pollutants, Radioactive; D002250:Carbon Radioisotopes; D002245:Carbon Dioxide