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Automated in situ instrumentation captured high-resolution surface water pCO₂, CH₄ and ²²²Rn data at the creek mouth, and ∼500 m upstream in a sub-tropical mangrove ecosystem (Southern Moreton Bay, Australia, S27.78°, E153.38°) over a spring-neap-spring tidal cycle (∼15 days) during November 2013. The partial pressure of CO₂ (pCO₂) ranged from 385 to 26,106 μatm, CH₄ from 1.8 to 889 nM, and ²²²Rn from 280 to 108,172 dpm m⁻³. Average surface water pCO₂, CH₄ and ²²²Rn were 4-fold higher at the upstream station. Surface water fluxes of CO₂ and CH₄ ranged from 9.4 to 629.2 mmol CO₂ m⁻² d⁻¹ and 13.1 to 632.9 μmol CH₄ m⁻² d⁻¹ depending upon the gas transfer model used and station location. Creek pCO₂, CH₄ and ²²²Rn displayed changes over both semi-diurnal and spring–neap–spring tidal scales. Semi-diurnally, all gases had a significant inverse relationship with water depth …