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  1. Specific activities of long-lived dissolved radium (Ra-226, Ra-228), collected from U.S. Geological Survey small boat operations in the West Florida Shelf from November 2022 to March 2024. Small boat samples include surface water, bottom water, and submarine groundwaters from three well transects along Nature Coast, Indian Rocks Beach, and Venice Headlands. This project investigates how boundary sources, including rivers and submarine groundwater discharge, deliver important nutrients and metals to the coastal ecosystems of the West Florida Shelf. Here, dissolved radium isotopes have been measured to trace boundary sources of nutrients and metals entering the West Florida Shelf. 
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  2. This dataset includes the specific activities of dissolved radon-222 collected from grab samples during STING I cruise AE2305 on R/V Atlantic Explorer (February to March 2023) and STING II cruise EN704 on R/V Endeavor in the Gulf of Mexico (June to July 2023). Additional data collected from underway samples during STING II are provided in the related dataset. This project investigates how boundary sources, including rivers and submarine groundwater discharge, deliver important nutrients and metals to the coastal ecosystems of the West Florida Shelf. Here, dissolved radon-222 has been measured to trace boundary sources of nutrients and metals entering the West Florida Shelf, including submarine groundwater discharge. 
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  3. Activities of dissolved radium (Ra-223, Ra-224, Ra-226, Ra-228), Th-228, and Ac-227, collected on two cruises in the Gulf of Mexico. STING I cruise AE2305 on R/V Atlantic Explorer was deployed from February to March 2023. STING II consisted of EN704 on R/V Endeavor and U.S. Geological Survey small boat surveys and took place from June to July 2023. This project investigates how boundary sources, including rivers and submarine groundwater discharge, deliver important nutrients and metals to the coastal ecosystems of the West Florida Shelf. Here, dissolved radium and parent isotopes have been measured to trace boundary sources of nutrients and metals entering the West Florida Shelf. 
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