Two decades of flask observations of atmospheric δ (O 2 ∕N 2 ), CO 2 , and APO at stations Lutjewad (the Netherlands) and Mace Head (Ireland), and 3 years from Halley station (Antarctica)

• Published in: Earth System Science Data
• Main Authors: L. N. T. Nguyen, H. A. J. Meijer, C. van Leeuwen, B. A. M. Kers, H. A. Scheeren, A. E. Jones, N. Brough, T. Barningham, P. A. Pickers, A. C. Manning, I. T. Luijkx
• Format: Article in Journal/Newspaper
• Language: English
• Published: Copernicus Publications 2022
• Subjects: Environmental sciences; GE1-350; Geology; QE1-996.5; Scripps; Mace; Halley Station; Antarc*; Antarctica
• Online Access: https://doi.org/10.5194/essd-14-991-2022; https://doaj.org/article/4d1181b2548e43dbabf2684748b27d64

We present 20-year flask sample records of atmospheric CO 2 , δ ( <math xmlns="http://www.w3.org/1998/Math/MathML" id="M9" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msub><mi mathvariant="normal">O</mi><mn mathvariant="normal">2</mn></msub><mo>/</mo><msub><mi mathvariant="normal">N</mi><mn mathvariant="normal">2</mn></msub></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="34pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="35807b8797f1e0b891dc79aac47c042b"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="essd-14-991-2022-ie00004.svg" width="34pt" height="14pt" src="essd-14-991-2022-ie00004.png"/></svg:svg> ), and atmospheric potential oxygen (APO) from the stations Lutjewad (the Netherlands) and Mace Head (Ireland), and a 3-year record from Halley station (Antarctica). We include details of our calibration procedures and the stability of our calibration scale over time, which we estimate to be 3 per meg over the 11 years of calibration, and our compatibility with the international Scripps O 2 scale. The measurement records from Lutjewad and Mace Head show similar long-term trends during the period 2002–2018 of 2.31 ± 0.07 ppm yr −1 for CO 2 and − 21.2 ± 0.8 per meg yr −1 for δ ( <math xmlns="http://www.w3.org/1998/Math/MathML" id="M18" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msub><mi mathvariant="normal">O</mi><mn mathvariant="normal">2</mn></msub><mo>/</mo><msub><mi mathvariant="normal">N</mi><mn mathvariant="normal">2</mn></msub></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="34pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="948b40d0edc5fb0e058d74cca032b019"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" ...