- Dona Paula, Goa, India.
- +91-0832- 2450327
- iiosc2020[at]nio[dot]org
Abstract Submission No. | ABS-2022-10-0259 |
Title of Abstract | Variation in carbonate burial in the equatorial Indian Ocean during late Glacial-Holocene: Implication to the deglacial rise of atmospheric CO2 |
Authors | Ramanand Yadav*, Sushant S. Naik |
Organisation | CSIR-National Institute of Oceanography, Goa |
Address | Sr-9, CSIR-NIO, Residential Colony, Dona Paula North Goa, Goa, India Pincode: 403004 Mobile: 9044623077 E-mail: ramanbhu248@gmail.com |
Country | India |
Presentation | Oral |
Abstract | To understand the variations in the history of carbonate burial throughout the last 30 ka, we have utilized a core (ODP Site716-A, 04.56°N & 73.17 °E) retrieved from a water depth of 533 m from the Maldives (carbonate platform) Sea. We analyzed CaCO3 %, C-org %, and shell weights of selected planktic foraminifera species (Globigerinoides ruber, Pulleniatina obliquiloculata, and Neogloboquadrina dutertrei) to see the contrast in carbonate preservation during the late glacial-Holocene. Our data set reveals that carbonate dissolution occurred during the last glacial maximum and the Holocene epoch, which probably resulted from organic matter degradation (oxidation process) in sediments. However, the mass accumulation rates of CaCO3 and C-org suggest better carbonate burial during the last glacial maximum and significantly higher burial rates during the Holocene. This is a result of increased surface productivity as well as sedimentation rates. Further, better preservation of the CaCO3 % and increased carbonate ion concentration (increased shell weight of planktic foraminifera) at the surface and in the water column suggests that outgassing of CO2 from the ocean to the atmosphere was well coupled with the warming condition of the Sea during the last deglaciation. |