Liu
Zhanfei
Liu
Zhanfei
No Thumbnail Available
Search Results
Now showing
1 - 4 of 4
-
ArticleAnalytical and computational advances, opportunities, and challenges in marine organic biogeochemistry in an era of "Omics"(Frontiers Media, 2020-09-02) Steen, Andrew D. ; Kusch, Stephanie ; Abdulla, Hussain A. ; Cakić, Nevenka ; Coffinet, Sarah ; Dittmar, Thorsten ; Fulton, James M. ; Galy, Valier ; Hinrichs, Kai-Uwe ; Ingalls, Anitra ; Koch, Boris P. ; Kujawinski, Elizabeth B. ; Liu, Zhanfei ; Osterholz, Helena ; Rush, Darci ; Seidel, Michael ; Sepulveda, Julio ; Wakeham, Stuart G.Advances in sampling tools, analytical methods, and data handling capabilities have been fundamental to the growth of marine organic biogeochemistry over the past four decades. There has always been a strong feedback between analytical advances and scientific advances. However, whereas advances in analytical technology were often the driving force that made possible progress in elucidating the sources and fate of organic matter in the ocean in the first decades of marine organic biogeochemistry, today process-based scientific questions should drive analytical developments. Several paradigm shifts and challenges for the future are related to the intersection between analytical progress and scientific evolution. Untargeted “molecular headhunting” for its own sake is now being subsumed into process-driven targeted investigations that ask new questions and thus require new analytical capabilities. However, there are still major gaps in characterizing the chemical composition and biochemical behavior of macromolecules, as well as in generating reference standards for relevant types of organic matter. Field-based measurements are now routinely complemented by controlled laboratory experiments and in situ rate measurements of key biogeochemical processes. And finally, the multidisciplinary investigations that are becoming more common generate large and diverse datasets, requiring innovative computational tools to integrate often disparate data sets, including better global coverage and mapping. Here, we compile examples of developments in analytical methods that have enabled transformative scientific advances since 2004, and we project some challenges and opportunities in the near future. We believe that addressing these challenges and capitalizing on these opportunities will ensure continued progress in understanding the cycling of organic carbon in the ocean.
-
DatasetHurricane Harvey impacts on biogeochemistry of sediments assessed using samples collected in Mission-Aransas Estuary in south Texas from June 2017 to March 2019(Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2021-03-05) Liu, Zhanfei ; Hardison, Amber ; Xue, JianhongThe impact of Hurricane Harvey on sediment biogeochemistry was assessed using sediment samples collected from June 2017 to March 2019 in Mission-Aransas Estuary in south Texas. Sediment core samples were sectioned and analyzed for mineral grain size, organic carbon and nitrogen, stable isotopic composition, pigments, plus sediment alkane and polycyclic aromatic hydrocarbons. 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/839436
-
DatasetHurricane Harvey impacts on biogeochemistry of water assessed using samples collected in Mission-Aransas Estuary in south Texas from June 2017 to March 2019(Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: bco-dmo-data@whoi.edu, 2021-03-05) Liu, Zhanfei ; Hardison, Amber ; Xue, JianhongThe impact of Hurricane Harvey on the chemical composition of water was assessed using samples collected from June 2017 to March 2019 at Mission-Aransas Estuary in south Texas. Hydrographic measurements including temperature, salinity, dissolved oxygen, and pH were collected on site using a YSI sonde. Water samples were obtained from both surface and bottom depths at 19 sites, and later analyzed for dissolved nutrients, organic carbon and nitrogen, and pigments. 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/839385
-
ArticleLaboratory-simulated photoirradiation reveals strong resistance of primary macroplastics to weathering(American Chemical Society, 2024-08-06) Jiang, Xiangtao ; Gallager, Scott ; Pedrosa-Pamies, Rut ; Ruff, S. Emil ; Liu, ZhanfeiThe photodegradation of macroplastics in the marine environment remains poorly understood. Here, we investigated the weathering of commercially available plastics (tabs 1.3 × 4.4 × 0.16 cm), including high-density polyethylene, low-density polyethylene, polypropylene, polystyrene, and polycarbonate, in seawater under laboratory-simulated ultraviolet A radiation for 3–9 months, equivalent to 25–75 years of natural sunlight exposure without considering other confounding factors. After the exposure, the physical integrity and thermal stability of the tabs remained relatively intact, suggesting that the bulk polymer chains were not severely altered despite strong irradiation, likely due to their low specific surface area. In contrast, the surface layer (∼1 μm) of the tabs was highly oxidized and eroded after 9 months of accelerated weathering. Several antioxidant additives were identified in the plastics through low temperature pyrolysis coupled with gas chromatography/mass spectrometry (Pyr-GC/MS) analysis. The Pyr-GC/MS results also revealed many new oxygen-containing compounds formed during photodegradation, and these compounds indicated the dominance of chain scission reactions during weathering. These findings highlight the strong resistance of industrial macroplastics to weathering, emphasizing the need for a broader range of plastics with varying properties and sizes to accurately estimate plastic degradation in the marine environment.