Impact of Changing Winds on the Mauna Loa CO₂ Seasonal Cycle in Relation to the Pacific Decadal Oscillation.

ABSTRACT: Long-term measurements at the Mauna Loa Observatory (MLO) show that the CO₂ seasonal cycle amplitude (SCA) increased from 1959 to 2019 at an overall rate of 0.22  ±  0.034 ppm decade^-1 while also varying on interannual to decadal time scales. These SCA changes are a signature of changes in land ecological CO₂ fluxes as well as shifting winds. Simulations with the TM3 tracer transport model and CO₂ fluxes from the Jena CarboScope CO₂ Inversion suggest that shifting winds alone have contributed to a decrease in SCA of -0.10  ±  0.022 ppm decade^-1 from 1959 to 2019, partly offsetting the observed long-term SCA increase associated with enhanced ecosystem net primary production. According to these simulations and MIROC-ACTM

SUBMITTER: Jin Y 

PROVIDER: S-EPMC9285976 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature