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| Author | Stukel, M.R.; Benitez-Nelson, C.R.; Decima, M.; Taylor, A.G.; Buchwald, C.; Landry, M.R. | ||||
| Title | The biological pump in the Costa Rica Dome: an open-ocean upwelling system with high new production and low export | Type | $loc['typeJournal Article'] | ||
| Year | 2016 | Publication | Journal of Plankton Research | Abbreviated Journal | J Plankton Res |
| Volume | 38 | Issue | 2 | Pages | 348-365 |
| Keywords | Eastern Tropical Pacific; biogeochemistry; carbon flux; nutrients; plankton | ||||
| Abstract | The Costa Rica Dome is a picophytoplankton-dominated, open-ocean upwelling system in the Eastern Tropical Pacific that overlies the ocean's largest oxygen minimum zone. To investigate the efficiency of the biological pump in this unique area, we used shallow (90-150 m) drifting sediment traps and 234Th:238U deficiency measurements to determine export fluxes of carbon, nitrogen and phosphorus in sinking particles. Simultaneous measurements of nitrate uptake and shallow water nitrification allowed us to assess the equilibrium balance of new and export production over a monthly timescale. While f-ratios (new:total production) were reasonably high (0.36 +/- 0.12, mean +/- standard deviation), export efficiencies were considerably lower. Sediment traps suggested e-ratios (export/14C-primary production) at 90-100 m ranging from 0.053 to 0.067. ThE-ratios (234Th disequilibrium-derived export) ranged from 0.038 to 0.088. C:N and N:P stoichiometries of sinking material were both greater than canonical (Redfield) ratios or measured C:N of suspended particulates, and they increased with depth, suggesting that both nitrogen and phosphorus were preferentially remineralized from sinking particles. Our results are consistent with an ecosystem in which mesozooplankton play a major role in energy transfer to higher trophic levels but are relatively inefficient in mediating vertical carbon flux to depth, leading to an imbalance between new production and sinking flux. | ||||
| Address | Scripps Institution of Oceanography , University of California at San Diego , La Jolla, CA 92037 , USA | ||||
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| Language | English | Summary Language | Original Title | ||
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| ISSN | 0142-7873 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Funding | PMID:27275035; PMCID:PMC4889986 | Approved | $loc['no'] | ||
| Call Number | COAPS @ mfield @ | Serial | 90 | ||
| Permanent link to this record | |||||
| Author | Zeng, H.; Chambers, J.Q.; Negron-Juarez, R.I.; Hurtt, G.C.; Baker, D.B.; Powell, M.D. | ||||
| Title | Impacts of tropical cyclones on U.S. forest tree mortality and carbon flux from 1851 to 2000 | Type | $loc['typeJournal Article'] | ||
| Year | 2009 | Publication | Proceedings of the National Academy of Sciences of the United States of America | Abbreviated Journal | Proc Natl Acad Sci U S A |
| Volume | 106 | Issue | 19 | Pages | 7888-7892 |
| Keywords | Biodiversity; Biomass; Carbon; *Cyclonic Storms; Ecosystem; Greenhouse Effect; Models, Statistical; Southeastern United States; *Trees; United States | ||||
| Abstract | Tropical cyclones cause extensive tree mortality and damage to forested ecosystems. A number of patterns in tropical cyclone frequency and intensity have been identified. There exist, however, few studies on the dynamic impacts of historical tropical cyclones at a continental scale. Here, we synthesized field measurements, satellite image analyses, and empirical models to evaluate forest and carbon cycle impacts for historical tropical cyclones from 1851 to 2000 over the continental U.S. Results demonstrated an average of 97 million trees affected each year over the entire United States, with a 53-Tg annual biomass loss, and an average carbon release of 25 Tg y(-1). Over the period 1980-1990, released CO(2) potentially offset the carbon sink in forest trees by 9-18% over the entire United States. U.S. forests also experienced twice the impact before 1900 than after 1900 because of more active tropical cyclones and a larger extent of forested areas. Forest impacts were primarily located in Gulf Coast areas, particularly southern Texas and Louisiana and south Florida, while significant impacts also occurred in eastern North Carolina. Results serve as an important baseline for evaluating how potential future changes in hurricane frequency and intensity will impact forest tree mortality and carbon balance. | ||||
| Address | Department of Ecology and Evolutionary Biology, Tulane University, 400 Boggs Center, New Orleans, LA 70118, USA. hzeng@tulane.edu | ||||
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| Language | English | Summary Language | Original Title | ||
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| ISSN | 0027-8424 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Funding | PMID:19416842; PMCID:PMC2683102 | Approved | $loc['no'] | ||
| Call Number | COAPS @ mfield @ | Serial | 658 | ||
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| Author | Stukel, M.R.; Kahru, M.; Benitez-Nelson, C.R.; Décima, M.; Goericke, R.; Landry, M.R.; Ohman, M.D. | ||||
| Title | Using Lagrangian-based process studies to test satellite algorithms of vertical carbon flux in the eastern North Pacific Ocean | Type | $loc['typeJournal Article'] | ||
| Year | 2015 | Publication | Journal of Geophysical Research: Oceans | Abbreviated Journal | J. Geophys. Res. Oceans |
| Volume | 120 | Issue | 11 | Pages | 7208-7222 |
| Keywords | satellite-derived export; carbon export; model algorithms; mesozooplankton grazing; sinking particles; gravitational flux | ||||
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| ISSN | 2169-9275 | ISBN | Medium | ||
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| Funding | Approved | $loc['no'] | |||
| Call Number | COAPS @ mfield @ | Serial | 113 | ||
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| Author | Brzezinski, M.A.; Krause, J.W.; Bundy, R.M.; Barbeau, K.A.; Franks, P.; Goericke, R.; Landry, M.R.; Stukel, M.R. | ||||
| Title | Enhanced silica ballasting from iron stress sustains carbon export in a frontal zone within the California Current | Type | $loc['typeJournal Article'] | ||
| Year | 2015 | Publication | Journal of Geophysical Research: Oceans | Abbreviated Journal | J. Geophys. Res. Oceans |
| Volume | 120 | Issue | 7 | Pages | 4654-4669 |
| Keywords | phytoplankton; diatoms; iron limitation; nutrient ratios; nutrient stoichiometry; carbon export | ||||
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| ISSN | 2169-9275 | ISBN | Medium | ||
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| Funding | Approved | $loc['no'] | |||
| Call Number | COAPS @ mfield @ | Serial | 97 | ||
| Permanent link to this record | |||||
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