Collection, Analysis, and Age-Dating of Sediment Cores from Salt Marshes, Rhode Island, 2016

The accretion history of fringing salt marshes in Narragansett Bay, Rhode Island, was reconstructed from sediment cores. Age models, based on excess lead-210 and cesium-137 radionuclide analysis, were constructed to evaluate how vertical accretion and carbon burial rates have changed during the past century. The Constant Rate of Supply (CRS) age model was used to date six cores collected from three salt marshes. Both vertical accretion rates and carbon burial increased from 1900 to 2016, the year the data were collected. Cores were up to 90 cm in length with dry bulk density ranging from 0.07 to 3.08 grams per cubic centimeter and carbon content 0.71 percent to 33.58 percent.

美国罗德岛州纳拉甘西特湾边缘盐沼的加积历史，通过沉积物岩芯得以重建。本数据集基于过剩铅210（excess lead-210）与铯137（cesium-137）放射性核素分析构建年代模型，以评估过去一个世纪内垂向加积速率与碳埋藏速率的变化规律。研究采用恒定补给速率（Constant Rate of Supply, CRS）年龄模型，对采自3处盐沼的6根沉积物岩芯进行定年。结果显示，1900年至数据采集年份2016年期间，垂向加积速率与碳埋藏速率均呈上升趋势。本次研究所涉岩芯最大长度可达90厘米，其干容重范围为0.07~3.08克每立方厘米，碳含量范围为0.71%~33.58%。