Understanding carbon flux dynamics in tropical ecosystems is crucial for evaluating their role in global climate regulation. This study investigates the temporal variability of the net ecosystem exchange (<em>NEE</em>) of CO<sub>2</sub> and its interactions with key meteorological variables in a tropical forest ecosystem of the Pantanal, Brazil. Using high-resolution hourly data from a flux tower, we apply Detrended Fluctuation Analysis (DFA) and Detrended Cross-Correlation Analysis (DCCA) to analyze diurnal to seasonal cycles of <em>NEE</em>, latent heat (<em>LE</em>), sensible heat (<em>H</em>), global radiation (<em>Rg</em>), air and soil temperature (<em>T</em><sub>air</sub> and <em>T</em><sub>soil</sub>), relative humidity (<em>rH</em>), and vapor pressure deficit (<em>VPD</em>). The results reveal a strong diurnal coupling between solar radiation, temperature, and carbon fluxes, with peak CO<sub>2</sub> uptake occurring at midday. A key novel finding is a marked shift to strong anti-persistence in <em>NEE </em>at the weekly scale during the dry season, a pattern supported by concurrent reductions in <em>LE</em> and <em>rH</em> and increases in <em>H</em> and <em>VPD</em>. This highlights that water limitation is a critical driver of carbon release and reveals a previously unidentified regulatory mechanism in the ecosystem's carbon cycle. These findings underscore the sensitivity of carbon dynamics to hydrometeorological conditions and underline the necessity of multi-scale analysis. Uncertainties remain regarding the role of extreme droughts and floods, as well as land-use dynamics, which merit further investigation.