Dynamic morphology of gas hydrate on a methane bubble in water: Observations and new insights for hydrate film models
| Autor: | Jonathan S. Levine, Brian J. Anderson, Ronald J. Lynn, Frank Shaffer, Robert P. Warzinski, Igor Haljasmaa, Ira Leifer |
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| Rok vydání: | 2014 |
| Předmět: |
geography
geography.geographical_feature_category Bubble Clathrate hydrate Methane Physics::Geophysics Physics::Fluid Dynamics chemistry.chemical_compound Geophysics Oceanography Water column chemistry Sea ice General Earth and Planetary Sciences Seawater Physics::Chemical Physics Hydrate Petrology Dissolution Physics::Atmospheric and Oceanic Physics Geology |
| Zdroj: | Geophysical Research Letters. 41:6841-6847 |
| ISSN: | 0094-8276 |
| DOI: | 10.1002/2014gl061665 |
| Popis: | Predicting the fate of subsea hydrocarbon gases escaping into seawater is complicated by potential formation of hydrate on rising bubbles that can enhance their survival in the water column, allowing gas to reach shallower depths and the atmosphere. The precise nature and influence of hydrate coatings on bubble hydrodynamics and dissolution is largely unknown. Here we present high-definition, experimental observations of complex surficial mechanisms governing methane bubble hydrate formation and dissociation during transit of a simulated oceanic water column that reveal a temporal progression of deep-sea controlling mechanisms. Synergistic feedbacks between bubble hydrodynamics, hydrate morphology, and coverage characteristics were discovered. Morphological changes on the bubble surface appear analogous to macroscale, sea ice processes, presenting new mechanistic insights. An inverse linear relationship between hydrate coverage and bubble dissolution rate is indicated. Understanding and incorporating these phenomena into bubble and bubble plume models will be necessary to accurately predict global greenhouse gas budgets for warming ocean scenarios and hydrocarbon transport from anthropogenic or natural deep-sea eruptions. |
| Databáze: | OpenAIRE |
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