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.

我们针对格陵兰冰盖项目2（Greenland Ice Sheet Project 2）冰芯，在末次冰期-间冰期旋回（距今976至97681年，深度介于264~2735米之间）中，对15个离散样品（每个样品约含2千克冰）的硫酸盐氧同位素、硝酸盐氧同位素与氮同位素进行了测定。每个样品对应约50厘米的冰芯深度，代表2~200年的积雪沉积量。此外，针对两次丹斯果德-厄施格事件（Dansgaard-Oeschger event，DO-12与DO-13，距今42967至49002年）的112个样品，我们开展了硝酸盐氮同位素与氧同位素的连续测量。每个样品的长度为0.5~1.0米，对应约50年的积雪沉积量。