Figure 2.30

Figure caption

Figure 2.30 | Changes in the amplitude of the seasonal cycle of CO₂. (a) Observed peak-to-trough seasonal amplitude given by the day of year of downward zero crossing, of CO₂ concentration at Barrow (71°N, blue) and Mauna Loa (20°N, black). Seasonal CO₂ cycles observed at (b) Barrow and (c) Mauna Loa for the 1961–1963 or 1958–1963 and 2017–2019 time periods. The first six months of the year are repeated. Reprinted with permission from AAAS. Further details on data sources and processing are available in the chapter data table (Table 2.SM.1).