Effects of intensification of the Indian Summer Monsoon on northern Andaman Sea sediments during the past 700 years

摘要: Recent studies have revealed an intensification of the Indian Summer Monsoon (ISM) over past 700 years, but its influence on sediments in northern Andaman Sea is unclear. To examine this influence, we used radiocarbon-dated sediment core StMY6, acquired 100 km offshore from Ayeyarwady River mouth, and obtained a 700-year-long record grain-size distribution geochemistry sedimentary sequence. The ISM influences precipitation surrounding River, thus river water discharges to near mouth weathering intensity catchment. Based system, propose that higher sedimentation rates larger modal grain size (the most abundant sediments) lower carbonate concentrations after about AD 1600 can be attributed intensity. Profiles total organic carbon (TOC) content carbon/nitrogen (C/N) ratios, however, did not show any trends 1600, which suggests has had little these proxies at site.