Kieber David J.

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Kieber

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David J.

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Biological consumption of carbon monoxide in Delaware Bay, NW Atlantic and Beaufort Sea

(Inter-Research, 2005-04-13) Xie, Huixiang ; Zafiriou, Oliver C. ; Umile, Thomas P. ; Kieber, David J.

Microbial consumption is the dominant sink of oceanic carbon monoxide (CO), one of the major carbon-containing photoproducts of chromophoric dissolved organic matter in marine waters. This study presents first-order microbial CO consumption rate constants (kCO) determined using whole-water dark incubations in summer and fall in diverse marine ecosystems covering the Delaware Bay, NW Atlantic, and Beaufort Sea. The microbial CO consumption rate constant, kCO (mean ± SD) was 1.11 ± 0.76 h–1 in the Delaware Bay, 0.33 ± 0.26 h–1 in the coastal Atlantic, 0.099 ± 0.054 h–1 in the open Atlantic, 0.040 ± 0.012 h–1 in the coastal Beaufort Sea and 0.020 ± 0.0060 h–1 in the offshore Beaufort Sea. The kCO in the Delaware Bay covaried with chlorophyll a concentration ([chl a]), rising with increasing salinity in the range 0 to 19 and diminishing with further increasing salinity. The kCO in the Beaufort Sea is significantly positively correlated with [chl a]. Both the Atlantic and cross-system data sets showed significant positive correlations between kCO and the product of [chl a] and water temperature, suggesting that [chl a] can be used as an indicator of CO-consuming bacterial activity in the areas and seasons sampled in this study. Microbial CO consumption was shown to follow Wright-Hobbie kinetics, with variable but low half-saturation concentrations: ~1 nM in the Beaufort Sea and Gulf Stream and 2 to 18 nM in the coastal NW Atlantic. These low half-saturation concentrations suggest that microbial CO consumption in seawater is at times partly saturated, and that some previous microbial CO consumption rates determined with the commonly used 14CO method could be underestimates due to the addition of 14CO as a tracer substrate. The present study provides valuable data for coastal and Arctic waters whose kCO values are poorly or not constrained, including extensive data on the dependence of kCO on the concentration of CO.
Photochemical production rates of acrylate in seawater following exposure to sunlight from a variety of marine environments between 2011-2018.

(Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2022-04-13) Kieber, David J.

These data summarize the photochemical production rates of acrylate in 0.2 µm-filtered seawater following their exposure to sunlight at the Richard Gump Research Station. Samples were collected from various marine environments between 2011 and 2018, including shallow-water coral reefs and sites of Mo’orea, French Polynesia. These data are published in Xue and Kieber 2021. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/871691
Biological turnover of acrylate and dimethylsulphoniopropionate from coral reefs sampled in Moorea, French Polynesia in April 2018

(Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2022-09-02) Xue, Lei ; Kieber, David J.

Shallow-water coral reefs hold large quantities of acrylate and its precursor dimethylsulfoniopropionate (DMSP). The main sources of acrylate in coral reefs are from the coral algal symbionts in the family Symbiodiniaceae and from the photolysis of dissolved organic matter. Heterotrophic consumption is the main loss for these compounds, albeit these processes are poorly characterized. This dataset contains rate-constant data for the biological consumption of dissolved acrylate and DMSP in near-surface seawater collected from a Mo’orea coral reef, French Polynesia, and the offshore open Pacific Ocean. The coral reef and Pacific Ocean stations were located offshore from the UC Berkeley Gump Research Station. Samples were collected from April 6 to April 24, 2018. Details of the sampling and experimental procedures for this dataset are reported in Xue et al. (2022). For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/879158
Apparent Quantum Yields for the Photochemical Formation of Carbonyl Compounds in Seawater from the R/V Endeavor EN589 in the Northwest Atlantic Ocean from September to October 2016.

(Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2019-11-22) Kieber, David J.

Apparent Quantum Yields for the Photochemical Formation of Carbonyl Compounds in Seawater from the R/V Endeavor EN589 in the Northwest Atlantic Ocean from September to October 2016. For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/781633
Solar irradiance in Delaware Estuary from the R/V Hugh R. Sharp HRS111107DK, HRS120809DK, HRS121112DK, HRS1313, HRS1324 in 2011 - 2013 (PAPI: Photochemistry and Photoheterotroph Interactions project)

(Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-10-01) Kieber, David J. ; Kirchman, David L

This data set is a compilation of solar irradiance data that were collected during the PAPI cruises 1 through 6 in the Delaware Estuary from Aug. 2009 to Nov. 2013. Data were obtained to support photobiological and photochemical experiments. (PAPI: Photochemistry and Photoheterotroph Interactions project) For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/551609
US SOLAS Science Report

(Woods Hole Oceanographic Institution, 2021-12) Stanley, Rachel H. R. ; Bell, Tom G. ; Gao, Yuan ; Gaston, Cassandra J. ; Ho, David T. ; Kieber, David J. ; Mackey, Katherine R. M. ; Meskhidze, Nicholas ; Miller, William L. ; Potter, Henry ; Vlahos, Penny ; Yager, Patricia L. ; Alexander, Becky ; Beaupre, Steven R. ; Craig, Susanne E. ; Cutter, Gregory A. ; Emerson, Steven ; Frossard, Amanda A. ; Gasso, Santiago ; Haus, Brian K. ; Keene, William C. ; Landing, William M. ; Moore, Richard H. ; Ortiz-Suslow, David ; Palter, Jaime B. ; Paulot, Fabien ; Saltzman, Eric ; Thornton, Daniel ; Wozniak, Andrew S. ; Zamora, Lauren M. ; Benway, Heather M.

The Surface Ocean – Lower Atmosphere Study (SOLAS) (http://www.solas-int.org/) is an international research initiative focused on understanding the key biogeochemical-physical interactions and feedbacks between the ocean and atmosphere that are critical elements of climate and global biogeochemical cycles. Following the release of the SOLAS Decadal Science Plan (2015-2025) (Brévière et al., 2016), the Ocean-Atmosphere Interaction Committee (OAIC) was formed as a subcommittee of the Ocean Carbon and Biogeochemistry (OCB) Scientific Steering Committee to coordinate US SOLAS efforts and activities, facilitate interactions among atmospheric and ocean scientists, and strengthen US contributions to international SOLAS. In October 2019, with support from OCB, the OAIC convened an open community workshop, Ocean-Atmosphere Interactions: Scoping directions for new research with the goal of fostering new collaborations and identifying knowledge gaps and high-priority science questions to formulate a US SOLAS Science Plan. Based on presentations and discussions at the workshop, the OAIC and workshop participants have developed this US SOLAS Science Plan. The first part of the workshop and this Science Plan were purposefully designed around the five themes of the SOLAS Decadal Science Plan (2015-2025) (Brévière et al., 2016) to provide a common set of research priorities and ensure a more cohesive US contribution to international SOLAS.
High dimethylsulfide photolysis rates in nitrate-rich Antarctic waters

(American Geophysical Union, 2004-06-09) Toole, Dierdre A. ; Kieber, David J. ; Kiene, Ronald P. ; White, E. M. ; Bisgrove, J. ; del Valle, Daniela A. ; Slezak, D.

The photochemistry of dimethylsulfide (DMS) was examined in the Southern Ocean to assess its impact on the biogeochemical dynamics of DMS in Antarctic waters. Very high DMS photolysis rate constants (0.16–0.23 h−1) were observed in surface waters exposed to full sunlight. DMS photolysis rates increased linearly with added nitrate concentrations, and 35% of the DMS loss in unamended samples was attributed to the photochemistry of ambient nitrate (29 μM). Experiments with optical filters showed that the UV-A band of sunlight (320–400 nm) accounted for ~65% of DMS photolysis suggesting that dissolved organic matter was the main photosensitizer for DMS photolysis. During the austral spring, DMS photolysis was the dominant loss mechanism under non-bloom and non-ice cover conditions owing to the high doses and deep penetration of UV radiation in the water column, low observed microbial consumption rates, and high in situ nitrate concentrations.
Depth-resolved photochemical production of hydrogen peroxide in the global ocean using remotely sensed ocean color

(Frontiers Media, 2022-10-20) Zhu, Yuting ; Powers, Leanne C. ; Kieber, David J. ; Miller, William L.

Hydrogen peroxide (H2O2) is an important reactive oxygen species (ROS) in natural waters, affecting water quality via participation in metal redox reactions and causing oxidative stress for marine ecosystems. While attempts have been made to better understand H2O2 dynamics in the global ocean, the relative importance of various H2O2 sources and losses remains uncertain. Our model improves previous estimates of photochemical H2O2 production rates by using remotely sensed ocean color to characterize the ultraviolet (UV) radiation field in surface water along with quantitative chemical data for the photochemical efficiency of H2O2 formation. Wavelength- and temperature-dependent efficiency (i.e., apparent quantum yield, AQY) spectra previously reported for a variety of seawater sources, including coastal and oligotrophic stations in Antarctica, the Pacific Ocean at Station ALOHA, the Gulf of Mexico, and several sites along the eastern coast of the United States were compiled to obtain a “marine-average” AQY spectrum. To evaluate our predictions of H2O2 photoproduction in surface waters using this single AQY spectrum, we compared modeled rates to new measured rates from Gulf Stream, coastal, and nearshore river-outflow stations in the South Atlantic Bight, GA, United States; obtaining comparative differences of 33% or less. In our global model, the “marine-average” AQY spectrum was used with modeled solar irradiance, together with satellite-derived surface seawater temperature and UV optical properties, including diffuse attenuation coefficients and dissolved organic matter absorption coefficients estimated with remote sensing-based algorithms. The final product of the model, a monthly climatology of depth-resolved H2O2 photoproduction rates in the surface mixed layer, is reported for the first time and provides an integrated global estimate of ∼21.1 Tmol yr−1 for hotochemical H2O2 production. This work has important implications for photo-redox reactions in seawater and improves our understanding of the role of solar irradiation on ROS cycling and the overall oxidation state in the oceans.
Nutrients, chlorophyll-a, and light attenuation in the Delaware estuary from the R/V Hugh R. Sharp HRS110805DK, HRS111107DK, HRS120809DK, HRS121112DK, HRS1313, HRS1324 in 2011 - 2013 (PAPI: Photochemistry and Photoheterotroph Interactions project)

(Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2020-10-01) Kieber, David J. ; Kirchman, David L

Nutrients, chlorophyll-a, and light attenuation in the Delaware estuary from the R/V Hugh R. Sharp HRS110805DK, HRS111107DK, HRS120809DK, HRS121112DK, HRS1313, HRS1324 in 2011 - 2013 (PAPI: Photochemistry and Photoheterotroph Interactions project) For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/551239
Concentrations of acrylate and dimethylsulphoniopropionate from the surface of coral reefs sampled in Moorea, French Polynesia in April 2018

(Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2022-09-01) Xue, Lei ; Kieber, David J.

Shallow-water coral reefs hold large quantities of acrylate and its precursor dimethylsulfoniopropionate (DMSP). The main sources of acrylate in coral reefs are from the coral algal symbionts in the family Symbiodiniaceae and from the photolysis of dissolved organic matter. Heterotrophic consumption is the main loss for these compounds, albeit these processes are poorly characterized. This dataset contains acrylate, DMSP, and dimethylsulfoxide (DMSO) concentrations in dissolved and unfiltered seawater samples that were collected from near-surface seawater in a Mo’orea coral reef, French Polynesia, and the offshore open Pacific Ocean. The coral reef and Pacific Ocean stations were located offshore from the UC Berkeley Gump Research Station. Samples were collected from April 6 to April 24, 2018. Details of the sampling and experimental procedures for this dataset are reported in Xue et al. (2022). For a complete list of measurements, refer to the full dataset description in the supplemental file 'Dataset_description.pdf'. The most current version of this dataset is available at: https://www.bco-dmo.org/dataset/879142

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