Transport of organic carbon from the tropical volcanic island of Dominica, Lesser Antilles

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Title: Transport of organic carbon from the tropical volcanic island of Dominica, Lesser Antilles
Creators: Mondro, Claire
Advisor: Carey, Anne
Issue Date: 2010-06
Abstract: Small rivers on high-standing islands (HSIs) around the world provide a substantial contribution to the total amount of carbon delivered to the global ocean. Dominica is a volcanic island, with little organic carbon found in the bedrock, making it a highly suitable natural laboratory to investigate the delivery of organic carbon solely from soils. A study comparing total carbon fluxes from 11 rivers on Dominica investigates the dissolved organic carbon (DOC) and particulate organic carbon (POC) yields from different regions of the island to determine a possible relation between carbon transport and geographic and environmental characteristics of the rivers. Results show DOC and POC yields that range from 0.2 to 3.67 t km-2 yr-1, ranking among the highest carbon yields to date worldwide. Phosphate concentrations are low (< 5 ppb) to non-detectable, suggesting a phosphate-limited nutrient system affected by chemical weathering. A strong correlation of DOC values with watershed area and silicate weathering yields indicates the importance of volcanic active margin terrains to the annual global carbon cycle.
Embargo: A one-year embargo was granted for this item.
Series/Report no.: The Ohio State University. School of Earth Sciences Honors Theses; 2010
Keywords: organic carbon
carbon cycle
high standing islands
Sponsors: Ohio State University School of Earth Sciences
Undergraduate Student Government
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