, We identify three distinct hydrothermal outflow regimes: (1) HT (>~200°C) sites representing essentially unmixed, primary, hydrothermal fluids
, Cross-spectral analyses reveal that HT discharge is modulated by tidal pressure rather than current, while the low-temperature fluids are influenced by tidal currents instead. IT discharge is variably modulated by both pressure and current
, Episodic perturbations observed in HT and IT records are generated by shallow, highly localized processes at the measurement sites that affect the mixing proportions of the end-member fluids
, The average temperature of the HT records, which are believed to represent end-member fluids, vary (both positive and negative) over annual time-scales
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