Greenland Ice Sheet Project 2 sulfate and nitrate isotopes

We measured sulfate oxygen and nitrate oxygen and nitrogen isotopes from the Greenland Ice Sheet Project 2 ice core from Greenland in 15 discrete samples (~ 2 kg of ice each) over the last glacial-interglacial cycle (from 976 - 97,681 years before present, between 264 - 2735 meters depth). Each sample spans ~50 cm depth, representing 2-200 years of snow accumulation. We also performed continuous measurements of nitrate nitrogen and oxygen isotopes on 112 samples over two Dansgaard-Oeschger (D O) events (DO-12 and -13 from 42,967 - 49,002 years before present). The length of each sample is 0.5-1.0 meter, representing ~50 years of snow accumulation.

本研究针对格陵兰冰芯项目2（Greenland Ice Sheet Project 2, GISP2）的格陵兰冰芯，在末次冰期-间冰期旋回（距今976至97681年、深度区间264至2735米）内的15个离散样品（单样品冰重约2千克），开展了硫酸盐氧同位素、硝酸盐氧同位素与氮同位素测试。单个样品的深度跨度约50厘米，对应2至200年的积雪沉积记录。此外，本研究还针对两次丹斯果-奥什格尔（Dansgaard-Oeschger, D-O）事件（即DO-12与DO-13，对应距今42967至49002年）的112个样品，完成了硝酸盐氮与氧同位素的连续测试。单个样品的长度为0.5至1.0米，对应约50年的积雪沉积记录。