Thirty-two years of high precision data on the stable isotopes of carbon dioxide from a successful collaboration between NOAA and INSTAAR 

• DOI: 10.5194/egusphere-egu24-14041
• Publication Date: 2024-03-09T00:35:18Z
• Authors: Sylvia Englund Mi...; Pieter Tans; John Miller; John Ortega; Kerstin Braun; Taline Leon; Bruce Vaughn; Reid Clark; Jianghanyang Li; James White

Monitoring the long-term changes in stable carbon isotope ratio of dioxide (expressed as δ13C-CO2) is a useful tool to track fate atmospheric CO2 and variations global cycle. Due small but significant change mean δ13C-CO2 approximately -0.75‰ over last three decades, robust traceable method required δ13C-CO2 globally. The Stable Isotope Lab at INSTAAR University Colorado Boulder has been partnering with NOAA’s Global Laboratory since 1990 measure isotopes within Greenhouse Gas Reference Network. Here, we present our latest data product, globally distributed observations past 32 years. We have improved traceability by moving onto -in-air JRAS-06 isotopic scale (a representation V-PDB). also established quality management systems methods quantifying uncertainty.  Our demonstrate how interactions among atmosphere, biosphere anthropogenic activities had recorded from more than 70 sites worldwide. reveal distinct seasonal that latitude, highlighting spatial differences influence activities, net photosynthesis, ocean-atmosphere exchange. Long-term show spatiotemporal patterns vary interannually, which mainly related impact climate variability on terrestrial biosphere. are actively engaged using these complex modeling frameworks better understand inter-relationships between