Tropical Central African bomb radiocarbon reveals antiphase air-mass atmospheric fluxes and vegetation-growth relationships

To achieve more accurate Earth system model projections of diverse climate scenarios, researchers need observation-based data on the movement of carbon between reservoirs, and especially across tropical regions. The Tropical Low-Pressure Belt (TLPB) is a key driver of atmospheric circulation across lower latitudes. While the TLPB shifts across the east–west extent of northern Africa, the extent to which 14C concentrations apply to Afrotropical forests remains untested, restricting our understanding about other carbon feedbacks. Here, we present a high-precision atmospheric 14C record (1940–2012) from a lowland tropical tree species (Entandrophragma utile) in Cameroon. We included 107 measurements from whole rings and 15 intra-annual slices. The intra-annual 14C data from 1962, 1963, and 1964 confirm a 7-month long growing season (April–November) with a photosynthetic profile typical of Northern Hemisphere (NH) sites, and showing no nonstructural-carbohydrate interference...., , # Data from: Tropical Central African bomb radiocarbon reveals antiphase air-mass atmospheric fluxes and vegetation-growth relationships

## Data S1 and S2

S1. Cameroon_14C_record_weighted mean
S2. Cameroon_14C_dataset_complete

## Brief description of dataset contents

**Data file S1** (Cameroon_14C_record_weighted mean) contains the annual data (Weighed mean ± larger of error of the mean or standard error of replicated data, when applicable) of the 73 *E. utile* tree rings from Cameroon, Africa (1°S, 53°W; 1940–2012). Variables (columns from left to right) listed are described as follows:

1. “#” = The sample number.
2. “Calendar year AD” = Dendrochronological calendar dates were adjusted to the calendar’s sub-annual level of 0.541 yrs (midpoint of the growing season) based on intra-annual Delta14C values of 1962, 1963 and 1964 rings. See Santos et al. 2025 doi: 10.1016/j.scitotenv.2025.179850 for details on intra-annual calendar year assessment.
3. “IRMS-d13C (‰)” = Values of IRMS d...,