Tracking the Evolution of Water Column NO3-+NO2- δ15N & δ18O from the South Atlantic, Through the Gulf of Mexico, and to the North Atlantic
The Gulf of Mexico is known for the biogeochemical impacts of significant riverine nutrient inputs on the ecosystem. However, it is unclear whether nutrients delivered to the Gulf of Mexico are subsequently exported from the Gulf, further influencing the chemistry of the North Atlantic. The nitrogen...
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Format: | Bachelor Thesis |
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Online Access: | http://purl.flvc.org/fsu/fd/FSU_libsubv1_scholarship_submission_1544166511_4abc31f1 http://fsu.digital.flvc.org/islandora/object/fsu%3A621060/datastream/TN/view/Tracking%20the%20Evolution%20of%20Water%20Column%20NO3-%2BNO2-%20%CE%B415N%20%26%20%CE%B418O%20from%20the%20South%20Atlantic,%20Through%20the%20Gulf%20of%20Mexico,%20and%20to%20the%20North%20Atlantic.jpg |
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ftfloridastunidc:oai:fsu.digital.flvc.org:fsu_621060 2023-05-15T17:28:44+02:00 Tracking the Evolution of Water Column NO3-+NO2- δ15N & δ18O from the South Atlantic, Through the Gulf of Mexico, and to the North Atlantic Howe, Samantha Paige (authoraut) 1 online resource computer application/pdf http://purl.flvc.org/fsu/fd/FSU_libsubv1_scholarship_submission_1544166511_4abc31f1 http://fsu.digital.flvc.org/islandora/object/fsu%3A621060/datastream/TN/view/Tracking%20the%20Evolution%20of%20Water%20Column%20NO3-%2BNO2-%20%CE%B415N%20%26%20%CE%B418O%20from%20the%20South%20Atlantic,%20Through%20the%20Gulf%20of%20Mexico,%20and%20to%20the%20North%20Atlantic.jpg English eng eng Text bachelor thesis ftfloridastunidc 2020-08-10T18:35:08Z The Gulf of Mexico is known for the biogeochemical impacts of significant riverine nutrient inputs on the ecosystem. However, it is unclear whether nutrients delivered to the Gulf of Mexico are subsequently exported from the Gulf, further influencing the chemistry of the North Atlantic. The nitrogen and oxygen isotopic composition of nitrate (NO3-) have been increasingly used to track nitrogen fluxes to, from, and cycling within the ocean. Here, we report the first dual isotopic composition measurements of NO3- from the Gulf of Mexico and Florida Straits, and compare these with prior measurements from the South and North Atlantic, and identify potential processes consistent with the observed shifts. The nitrogen and oxygen isotopic composition of nitrate in the Gulf of Mexico and Florida Straits is very similar to that previously measured in the Sargasso Sea. There is little evidence for riverine or submarine groundwater NO3- directly influencing the isotopic composition of NO3- exported from the Gulf of Mexico. These results are consistent with recent modeling work suggesting that the majority of riverine nutrients delivered to the Gulf of Mexico are retained in the near-shore region. nitrate isotopes, Gulf of Mexico, nutrient cycling, nitrate concentration Bachelor Thesis North Atlantic Florida State University Digital Library (FSUDL) |
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Open Polar |
collection |
Florida State University Digital Library (FSUDL) |
op_collection_id |
ftfloridastunidc |
language |
English |
description |
The Gulf of Mexico is known for the biogeochemical impacts of significant riverine nutrient inputs on the ecosystem. However, it is unclear whether nutrients delivered to the Gulf of Mexico are subsequently exported from the Gulf, further influencing the chemistry of the North Atlantic. The nitrogen and oxygen isotopic composition of nitrate (NO3-) have been increasingly used to track nitrogen fluxes to, from, and cycling within the ocean. Here, we report the first dual isotopic composition measurements of NO3- from the Gulf of Mexico and Florida Straits, and compare these with prior measurements from the South and North Atlantic, and identify potential processes consistent with the observed shifts. The nitrogen and oxygen isotopic composition of nitrate in the Gulf of Mexico and Florida Straits is very similar to that previously measured in the Sargasso Sea. There is little evidence for riverine or submarine groundwater NO3- directly influencing the isotopic composition of NO3- exported from the Gulf of Mexico. These results are consistent with recent modeling work suggesting that the majority of riverine nutrients delivered to the Gulf of Mexico are retained in the near-shore region. nitrate isotopes, Gulf of Mexico, nutrient cycling, nitrate concentration |
author2 |
Howe, Samantha Paige (authoraut) |
format |
Bachelor Thesis |
title |
Tracking the Evolution of Water Column NO3-+NO2- δ15N & δ18O from the South Atlantic, Through the Gulf of Mexico, and to the North Atlantic |
spellingShingle |
Tracking the Evolution of Water Column NO3-+NO2- δ15N & δ18O from the South Atlantic, Through the Gulf of Mexico, and to the North Atlantic |
title_short |
Tracking the Evolution of Water Column NO3-+NO2- δ15N & δ18O from the South Atlantic, Through the Gulf of Mexico, and to the North Atlantic |
title_full |
Tracking the Evolution of Water Column NO3-+NO2- δ15N & δ18O from the South Atlantic, Through the Gulf of Mexico, and to the North Atlantic |
title_fullStr |
Tracking the Evolution of Water Column NO3-+NO2- δ15N & δ18O from the South Atlantic, Through the Gulf of Mexico, and to the North Atlantic |
title_full_unstemmed |
Tracking the Evolution of Water Column NO3-+NO2- δ15N & δ18O from the South Atlantic, Through the Gulf of Mexico, and to the North Atlantic |
title_sort |
tracking the evolution of water column no3-+no2- δ15n & δ18o from the south atlantic, through the gulf of mexico, and to the north atlantic |
url |
http://purl.flvc.org/fsu/fd/FSU_libsubv1_scholarship_submission_1544166511_4abc31f1 http://fsu.digital.flvc.org/islandora/object/fsu%3A621060/datastream/TN/view/Tracking%20the%20Evolution%20of%20Water%20Column%20NO3-%2BNO2-%20%CE%B415N%20%26%20%CE%B418O%20from%20the%20South%20Atlantic,%20Through%20the%20Gulf%20of%20Mexico,%20and%20to%20the%20North%20Atlantic.jpg |
genre |
North Atlantic |
genre_facet |
North Atlantic |
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1766121594656129024 |