Preface to the special issue: Western Pacific biogeochemical cycles across the air-sea and sediment-water interfaces and their response to global changes

The Western Pacific is a unique region for studying cross-interface biogeochemical cycling, which is influenced by the boundary currents and their interactions with the East Asian marginal seas. This special issue expands our knowledge of the Western Pacific biogeochemical cycles across the air–sea and sediment–water interfaces, and their links with global climate change. It contains 27 research articles addressing 3 primary themes: (i) air–sea interface processes (e.g., biological pump, gas exchange, dust fluxes), (ii) sediment–water interface processes (e.g., organic matter diagenesis, hydrothermal flux, metal isotope geochemistry), and (iii) paleoceanographic records documenting past Western Pacific productivity, carbon cycle and water mass mixing. Together, these contributions advance our understanding of how the Western Pacific Ocean participates in global biogeochemical and climate systems, both in the present and geological past.