Concentration and isotopic composition of atmospheric N2O over the last century

We have reconstructed the atmospheric N2O mole fraction and its isotopic composition by combining data from ice cores, firn air, and atmospheric samples. The mole fraction reconstruction extends back to 1000 CE using ice cores, firn air, and atmospheric sampling; and the isotopic reconstruction extends back to 1900 CE using only firn air data. We have incorporated both newly measured and previously published data. We present new data for the mole fraction, d15Nbulk, d18O, and d15NSP values from the Styx (East Antarctica) firn air, and mole fraction from the North Greenland Eemian Ice drilling Project (NEEM) firn air. We have used published records from the Styx and NEEM ice cores, direct atmospheric measurements from the NOAA global sampling network, and firn air data, giving a total of 11 sites for N2O mole fraction, 12 sites for d15Nbulk, 11 sites for d18O, and 8 sites for d15NSP values.

搜集汇总

背景与挑战

背景概述

该数据集重建了过去一个世纪大气中N2O的浓度和同位素组成，结合了冰芯、雪层空气和大气样本数据，其中摩尔分数重建可追溯到公元1000年，同位素组成重建可追溯到1900年。数据集包含新测量和已发表的数据，覆盖多个站点，涉及N2O摩尔分数、d15Nbulk、d18O和d15NSP等参数，为研究N2O的历史变化提供了综合数据支持。