Geochemical mapping of a blue carbon zone: Investigation of the influence of riverine input on tidal affected zones in Bull Island

Bull Island (BI) is a coastal sand spit that formed as an unintended consequence of the construction two walls, built over 200 years ago in Dublin Port, Ireland to alleviate silting shipping route. A large lagoon, on land side island was separated 1964 by causeway produce separate lagoons are now impacted different water sources. Here we investigate influence riverine inputs adjacent but unconnected tidal wetland lagoons. The South lagoon (SL) supplied passing through eutrophic R. Liffey and Tolka estuary zones, while North Lagoon (NL) seawater lesser degree, freshwater from plume. Within each these zones clear ecotone exists between mudflats (MF) vegetated saltmarshes (SM). We determined quantity distributions bulk geochemical characteristics across BI’s sediments, including total organic carbon (TOC), nitrogen (TN), metals, also, 16 individual polyromantic hydrocarbon’s (PAH’s) indication anthropogenic input. Primary focus placed studying blue sediments zones. Significant differences analytical results showed major influences exerted sediment geochemistry within lagoon. This study highlights ability functioning flourish sequester elevated levels carbon, metals pollutants under constraints increasing impact. As inadvertent result geo-engineering, BI its environs very important site potential artificially constructed wetlands act reservoirs.