The concentrations of bioactive trace metals (Fe, Cu, Mn, Zn, Co, Ni, Cd, and Pb), Fe-and Cu-binding organic ligands, and electroactive Fe-binding humic substances were measured in surface waters across the West Florida Shelf in the eastern Gulf of Mexico in June 2015 and in February-March 2018. Seasonal differences in dust deposition were associated with increased concentrations of Fe, Mn and Pb in offshore surface waters in June 2015 compared to Feb-Mar 2018. Total concentrations of Fe-binding ligands offshore were similar between seasons, and this ambient ligand pool acted to stabilize a portion of Fe delivered via dust deposition within the dissolved fraction. Apparent photoreduction of Cu-binding organic ligands in offshore summer surface waters led to bioavailable Cu²⁺ concentrations that could potentially inhibit the growth of some cyanobacteria species. The concentrations of Fe-binding humic-like ligands were better correlated with Cu-binding ligands than Fe-binding ligands, suggesting that terrestrially derived photoactive ligands may have a significant influence on the cycling of Cu-binding ligands across the West Florida Shelf. Intrusion of the Loop Current into the study region was observed in June 2015 and appeared to entrain bands of low salinity water from the northern Gulf of Mexico. This process brought elevated trace metals and Fe-binding humic-like ligands to the outer West Florida Shelf, which may then be delivered to the North Atlantic via the Loop Current-Florida Current-Gulf Stream system.

在整个西佛罗里达州的地表水中测量了生物活性痕量金属（Fe，Cu，Mn，Zn，Co，Ni，Cd和Pb），Fe和Cu结合的有机配体以及电活性Fe结合的腐殖质的浓度。 2015年6月和2018年2月至2018年3月在墨西哥湾东部的架子上。与2018年2月至3月相比，2015年6月离岸地表水中铁，锰和铅的浓度增加与粉尘沉积的季节性差异有关。在季节之间，海上的铁结合配体相似，并且该环境配体池起到稳定通过溶解级分中的粉尘沉积输送的一部分铁的作用。夏季近海地表水中铜结合有机配体的明显光还原导致可生物利用的铜²⁺浓度可能会抑制某些蓝细菌物种的生长。与Fe结合的配体相比，与Fe结合的腐殖质样配体的浓度与Cu结合的配体的相关性更好，这表明陆地衍生的光敏配体可能会对整个西佛罗里达州的Cu结合的配体的循环产生重大影响。2015年6月观察到环流侵入研究区域，并似乎夹带了来自墨西哥湾北部的低盐度水带。该过程将升高的痕量金属和结合铁的腐殖质样配体带到了西佛罗里达州的外层架，然后可以通过Loop Current-Florida Current-Gulf Stream系统将其运送到北大西洋。