DECADAL CHANGES OF RADIOCARBON IN THE SURFACE BAY OF BENGAL: THREE DECADES AFTER GEOSECS AND ONE DECADE AFTER WOCE

作者：Dutta Koushik^*; Prasad G V Ravi; Ray Dinesh K; Raghav Sanjeev

来源：Radiocarbon, 2010, 52(3): 1191-1196.

DOI：10.1017/S0033822200046269

Radiocarbon was measured in the surface seawater dissolved inorganic carbon (DIC) of the Bay of Bengal during November 2006. A meridional transect of the Delta C-14 in DIC was obtained from measurements in closely spaced samples collected roughly along 88 E. The Delta C-14 of these samples ranged from 449 parts per thousand to 57.7 parts per thousand (mean 51.8 +/- 1.1 parts per thousand, n = 12), and 38 parts per thousand at one station in the northern Bay of Bengal. The overall pattern of C-14 distribution in DIC of surface Bay of Bengal during 2006 was roughly similar to that during the WOCE expedition of 1995. These results indicate a Delta C-14 decline rate of similar to 4 parts per thousand per decade since WOCE in the surface Bay of Bengal, which is much smaller compared to a decline rate of similar to 25 parts per thousand per decade observed in the 2 decades between the GEOSECS and WOCE expeditions, due to the smaller atmosphere-ocean Delta C-14 gradient.

• 出版日期2010