Seasonal ammonium benthic flux and photo-ammonification of dissolved organic nitrogen in Baffin Bay - Texas
Estuaries and coastal regions are hot spots of global primary production as they account for 30% of the net marine productivity, despite representing only 7% of the total marine surface area. Nutrient patchiness is the second most influential factor (after temperature) in site seasonal variability o...
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fttexasamucorpus:oai:tamucc-ir.tdl.org:1969.6/95070 2023-10-25T01:36:51+02:00 Seasonal ammonium benthic flux and photo-ammonification of dissolved organic nitrogen in Baffin Bay - Texas Ton, Quang Abdulla, Hussain Felix, Joseph Seemann, Frauke 2022-12 84 pages application/pdf application/vnd.openxmlformats-officedocument.wordprocessingml.document https://hdl.handle.net/1969.6/95070 en_US eng https://hdl.handle.net/1969.6/95070 This material is made available for use in research, teaching, and private study, pursuant to U.S. Copyright law. The user assumes full responsibility for any use of the materials, including but not limited to, infringement of copyright and publication rights of reproduced materials. Any materials used should be fully credited with its source. All rights are reserved and retained regardless of current or future development or laws that may apply to fair use standards. Permission for publication of this material, in part or in full, must be secured with the author and/or publisher. ammonium benthic flux Baffin Bay photo-ammonification Text Thesis 2022 fttexasamucorpus 2023-09-25T10:23:09Z Estuaries and coastal regions are hot spots of global primary production as they account for 30% of the net marine productivity, despite representing only 7% of the total marine surface area. Nutrient patchiness is the second most influential factor (after temperature) in site seasonal variability of net primary production. This guides a consensus that nitrogen (N) loading is a primary factor in eutrophication and hypoxia. Despite this recognized connection between excess N loading and ecosystem decline, the internal N cycling and transformations in coastal areas are still not well characterized. This study quantified the sediment porewater flux of ammonium (NH4 + ) and photo-ammonification from benthic dissolved organic nitrogen (DON) as well as investigated changes in porewater DOM chemical structures of Baffin Bay - Texas during different irradiation time periods using the state of art Orbitrap Fusion Tribrid Mass Spectrometer. Baffin Bay (BB) is a semi-arid inverse estuary ecosystem that has experienced prolonged and intense brown tide blooms (Aureoumbra lagunensis species) since the 1990s, and several occurrences of hypoxia conditions that caused seagrass die-off and several occasions of large fish kill over the past decades. Pore water samples were collected from six stations in the bay during six seasons (October 2020, February 2021, June 2021, October 2021, February 2022, and May 2022) for depth profile analysis. The bay showed a large spatial variability of NH4 + benthic flux, with BB1 having the lowest average NH4 + flux at 56 ± 27 µmol.m-2.day-1 and BB3 had the highest average flux at 347 ± 211 µmol.m-2.day-1. The seasonal NH4 + average benthic flux to the entire bay water column was 124 – 244 µmol.m-2.day-1 and served as a significant source of inorganic nutrients to support the primary production. In addition, the photo-ammonification rate of benthic DON (after it entered the water column) ranged from 0.038-0.361 µmol.L-1.hour-1 and served as an additional source of inorganic nutrients to primary ... Thesis Baffin Bay Texas A&M University - Corpus Christi: DSpace Repository Baffin Bay |
institution |
Open Polar |
collection |
Texas A&M University - Corpus Christi: DSpace Repository |
op_collection_id |
fttexasamucorpus |
language |
English |
topic |
ammonium benthic flux Baffin Bay photo-ammonification |
spellingShingle |
ammonium benthic flux Baffin Bay photo-ammonification Ton, Quang Seasonal ammonium benthic flux and photo-ammonification of dissolved organic nitrogen in Baffin Bay - Texas |
topic_facet |
ammonium benthic flux Baffin Bay photo-ammonification |
description |
Estuaries and coastal regions are hot spots of global primary production as they account for 30% of the net marine productivity, despite representing only 7% of the total marine surface area. Nutrient patchiness is the second most influential factor (after temperature) in site seasonal variability of net primary production. This guides a consensus that nitrogen (N) loading is a primary factor in eutrophication and hypoxia. Despite this recognized connection between excess N loading and ecosystem decline, the internal N cycling and transformations in coastal areas are still not well characterized. This study quantified the sediment porewater flux of ammonium (NH4 + ) and photo-ammonification from benthic dissolved organic nitrogen (DON) as well as investigated changes in porewater DOM chemical structures of Baffin Bay - Texas during different irradiation time periods using the state of art Orbitrap Fusion Tribrid Mass Spectrometer. Baffin Bay (BB) is a semi-arid inverse estuary ecosystem that has experienced prolonged and intense brown tide blooms (Aureoumbra lagunensis species) since the 1990s, and several occurrences of hypoxia conditions that caused seagrass die-off and several occasions of large fish kill over the past decades. Pore water samples were collected from six stations in the bay during six seasons (October 2020, February 2021, June 2021, October 2021, February 2022, and May 2022) for depth profile analysis. The bay showed a large spatial variability of NH4 + benthic flux, with BB1 having the lowest average NH4 + flux at 56 ± 27 µmol.m-2.day-1 and BB3 had the highest average flux at 347 ± 211 µmol.m-2.day-1. The seasonal NH4 + average benthic flux to the entire bay water column was 124 – 244 µmol.m-2.day-1 and served as a significant source of inorganic nutrients to support the primary production. In addition, the photo-ammonification rate of benthic DON (after it entered the water column) ranged from 0.038-0.361 µmol.L-1.hour-1 and served as an additional source of inorganic nutrients to primary ... |
author2 |
Abdulla, Hussain Felix, Joseph Seemann, Frauke |
format |
Thesis |
author |
Ton, Quang |
author_facet |
Ton, Quang |
author_sort |
Ton, Quang |
title |
Seasonal ammonium benthic flux and photo-ammonification of dissolved organic nitrogen in Baffin Bay - Texas |
title_short |
Seasonal ammonium benthic flux and photo-ammonification of dissolved organic nitrogen in Baffin Bay - Texas |
title_full |
Seasonal ammonium benthic flux and photo-ammonification of dissolved organic nitrogen in Baffin Bay - Texas |
title_fullStr |
Seasonal ammonium benthic flux and photo-ammonification of dissolved organic nitrogen in Baffin Bay - Texas |
title_full_unstemmed |
Seasonal ammonium benthic flux and photo-ammonification of dissolved organic nitrogen in Baffin Bay - Texas |
title_sort |
seasonal ammonium benthic flux and photo-ammonification of dissolved organic nitrogen in baffin bay - texas |
publishDate |
2022 |
url |
https://hdl.handle.net/1969.6/95070 |
geographic |
Baffin Bay |
geographic_facet |
Baffin Bay |
genre |
Baffin Bay |
genre_facet |
Baffin Bay |
op_relation |
https://hdl.handle.net/1969.6/95070 |
op_rights |
This material is made available for use in research, teaching, and private study, pursuant to U.S. Copyright law. The user assumes full responsibility for any use of the materials, including but not limited to, infringement of copyright and publication rights of reproduced materials. Any materials used should be fully credited with its source. All rights are reserved and retained regardless of current or future development or laws that may apply to fair use standards. Permission for publication of this material, in part or in full, must be secured with the author and/or publisher. |
_version_ |
1780731842307031040 |