Porth Ymchwil

Professor Mattias Green

Professor in Physical Oceanography

Aelodaeth

ORCID: 0000-0001-5090-1040

Contact info

Room: 202 Craig Mair
Phone: 01248 382893
E-mail: m.green@bangor.ac.uk
Google Scholar
ResearchGate

I graduated in Physical Oceanography from Gothenburg University in 1999 and undertook my PhD in physical oceanography at the same university between 2008-2004. I stayed in Gothenburg as a research associate for a further year before moving to Bangor to start as a post-doctoral researcher on the structure of turbulence in shelf seas.  In 2008 I was awarded a NERC Advanced Fellowship investigating the effects of sea-level change on the dissipation of tidal energy in the past, present and future and how that may impact on climate. In 2013 Bangor offered me position as Senior Lecturer in Physical Oceanography, in 2016 I was promoted to Reader, and in 2019 I was awarded a Person Chair in physical oceanography.

I am a physical oceanographer using models and observations to explore how the tides interact with other components of the Earth system and how these interactions change over long timescales. I especially focus on how tidally driven mixing influence large-scale ocean circulation and climate; effects of sea-level change (on short time scales) and continental drift (on geological time scales) on the tides; ice-ocean-climate interactions and how melting ice-sheets will affect the earth system; the influence of the tides to allow the ocean to evolve and host life, including tidal dynamics during extinction events. 

 

 

1 - 50 o blith 94Maint y tudalen: 50
Trefnu yn ôl: Blwyddyn gyhoeddi
  1. 2023
  2. Cyhoeddwyd

    Late Pleistocene evolution of tides and tidal dissipation

    Wilmes, S-B., Pedersen, V. K., Schindelegger, M. & Green, M., 9 Tach 2023, Yn: Paleoceanography and Paleoclimatology. 38, 11, e2023PA004727.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  3. Cyhoeddwyd

    Local human impacts disrupt depth-dependent zonation of tropical reef fish communities

    Richardson, L., Heenan, A., Delargy, A., Neubauer, P., Lecky, J., Gove, J. M., Green, M., Kindinger, T., Ingeman, K. & Williams, G. J., Tach 2023, Yn: Nature Ecology and Evolution. 7, 11, t. 1844-1855 12 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  4. E-gyhoeddi cyn argraffu

    Testing geological proxies for deep-time tidal model simulations

    Guo, B., Fitzgerald, L., Hewitt, J., Pampaloni, O. & Green, M., 18 Hyd 2023, (E-gyhoeddi cyn argraffu) Yn: The Depositional Record.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  5. E-gyhoeddi cyn argraffu

    Near-island enhancement in mesopelagic micronekton communities off Hawaiʻi

    Drazen, J., Clark, B., Gove, J. M., Phipps, J., Copeland, A., Lecky, J., Green, M., Kobayashi, D., Turner, J., Whitney, J. & Williams, G. J., 10 Gorff 2023, (E-gyhoeddi cyn argraffu) Yn: Deep Sea Research Part I: Oceanographic Research Papers. 104107.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  6. Cyhoeddwyd

    Ocean currents magnify upwelling and deliver nutritional subsidies to reef-building corals during El Niño heatwaves

    Fox, M., Guillaume-Castel, R., Edwards, C., Glanz, J., Gove, J. M., Green, M., Juhlin, E., Smith, J. & Williams, G. J., 14 Meh 2023, Yn: Science Advances. 9, 24, eadd5032.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  7. Cyhoeddwyd

    Ice Shelf Basal Melt Sensitivity to Tide-Induced Mixing Based on the Theory of Subglacial Plumes

    Anselin, J., Reed, B., Jenkins, A. & Green, M., 30 Ebr 2023, Yn: Journal of Geophysical Research: Oceans. 128, 4, e2022JC019156.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  8. Cyhoeddwyd

    Applying landscape metrics to species distribution model predictions to characterize internal range structure and associated changes

    Curd, A., Chevalier, M., Vasquez, M., Boye, A., Firth, L. B., Marzloff, M. P., Bricheno, L. M., Burrows, M. T., Bush, L. E., Cordier, C., Davies, A. J., Green, M., Hawkins, S. J., Lima, F. P., Meneghesso, C., Mieszkowska, N., Seabra, R. & Dubois, S. F., 1 Chwef 2023, Yn: Global Change Biology. 29, 3, t. 631-647 17 t.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  9. 2022
  10. Cyhoeddwyd

    Interannual Changes in Tidal Conversion Modulate M2 Amplitudes in the Gulf of Maine

    Schindelegger, M., Kotzian, D. P., Ray, R., Green, M. & Stolzenberger, S., 28 Rhag 2022, Yn: Geophysical Research Letters. 49, 24, t. e2022GL101671

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  11. Cyhoeddwyd

    Why is there a tide?

    Ward, S., Bowers, D., Green, M. & Wilmes, S-B., 7 Hyd 2022, A Journey Through Tides. Green, M. & Duarte, J. (gol.). Elsevier, t. 81-113

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

  12. Cyhoeddwyd

    Chapter 6: Hadean and Archean (4600–2500 Ma)

    Davies, H., Duarte, J. & Green, M., 23 Medi 2022, A journey through tides. Green, M. & Duarte, J. (gol.). Elsevier, t. 133-141

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod

  13. Cyhoeddwyd

    Tidal dynamics in palaeo-seas in response to changes in physiography, tidal forcing and bed shear stress

    Zuchuat, V., Steele, E., Mulligan, R. P., Collins, D. S. & Green, M., 1 Meh 2022, Yn: Sedimentology. 69, 4, t. 1861-1890

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  14. 2021
  15. Cyhoeddwyd

    Long-term Earth-Moon evolution with high-level orbit and ocean tide models

    Daher, H., Arbic, B. K., Williams, J. G., Ansong, J. K., Boggs, D. H., Müller, M., Schindelegger, M., Adcroft, A. J., Austermann, J., Cornuelle, B. D., Crawford, E. B., Fringer, O. B., Lau, H., Lock, S. J., Maloof, A. C., Menemenlis, D., Mitrovica, J. X., Green, M. & Huber, M., Rhag 2021, Yn: Journal of Geophysical Research: Planets. 126, 12, e2021JE006875.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  16. Cyhoeddwyd

    Distribution of coastal high water level during extreme events around the UK and Irish coasts

    Rulent, J., Bricheno, L., Green, M., Haigh, I. D. & Lewis, H., 8 Tach 2021, Yn: Natural Hazards and Earth System Sciences. 21, 11, t. 3339–3351

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  17. Cyhoeddwyd

    Enhanced vertical mixing in the glacial ocean inferred from sedimentary carbon isotopes

    Wilmes, S-B., Green, M. & Schmittner, A., 18 Awst 2021, Yn: Communications Earth and Environment. 2, 166.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  18. Cyhoeddwyd

    Quantifying upwelling in tropical shallow waters: a novel method using a temperature stratification index

    Guillaume-Castel, R., Williams, G. J., Rogers, J. S., Gove, J. M. & Green, M., Awst 2021, Yn: Limnology and Oceanography: Methods. 19, 8, t. 566-577 10499.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  19. Cyhoeddwyd

    Shelf Seas Baroclinic Energy Loss: Pycnocline Mixing and Bottom Boundary Layer Dissipation

    Inall, M. E., Toberman, M., Polton, J., Palmer, M. R., Green, M. & Rippeth, T., Awst 2021, Yn: Journal of Geophysical Research: Oceans. 126, 8, e2020JC016528.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  20. Cyhoeddwyd

    The climates of Earth's next supercontinent: effects of tectonics, rotation rate, and insolation

    Way, M., Davies, H., Duarte, J. & Green, M., Awst 2021, Yn: Geochemistry, Geophysics, Geosystems. 22, 8, e2021GC009983.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  21. Cyhoeddwyd

    Preface to the Copernicus Special Issue on Developments in the Science and History of Tides

    Woodworth, P. L., Green, M., Ray, R. D. & Huthnance, J., 18 Meh 2021, Yn: Ocean Science. 17, 3, t. 809-818

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  22. Cyhoeddwyd

    Specific niche requirements underpin multidecadal range edge stability, but may introduce barriers for climate change adaptation

    Firth, L. B., Harris, D., Blaze, J. A., Marzloff, M. P., Boye, A., Miller, P. I., Curd, A., Nunn, J. D., O'Connor, N. E., Power, A. M., Mieszkowska, N., O'Riordan, R. M., Burrows, M. T., Bricheno, L. M., Knights, A. M., Nunes, F. L. D., Bordeyne, F., Bush, L., Byers, J. E., David, C., Davies, A., Dubois, S. F., Edwards, H., Foggo, A., Grant, L., Green, M., Gribben, P., Lima, F. P., McGrath, D., Noel, L. M. L. J., Seabra, R., Simkanin, C., Vasquez, M. & Hawkins, S. J., Ebr 2021, Yn: Diversity and Distributions. 27, 4, t. 668-683

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  23. Cyhoeddwyd

    30-Second Oceans

    Lenn, Y-D. (gol.) & Green, M. (gol.), 21 Maw 2021, The Ivy Press. 160 t. (30-Second....)

    Allbwn ymchwil: Llyfr/Adroddiad › Llyfr

  24. 2020
  25. Cyhoeddwyd

    Weak tides during Cryogenian glaciations

    Green, M., Davies, H., Duarte, J., Creveling, J. & Scotese, C., 4 Rhag 2020, Yn: Nature Communications. 11, 1, 6227.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  26. Cyhoeddwyd

    Tides, the Moon and the Kaleidoscope of Ocean Mixing

    Rippeth, T. & Green, M., 16 Tach 2020, Oceanography and Marine Biology: An Annual Review. Hawkins, S. J., Allcock, A. L., Bates, A. E., Evans, A. J., Firth, L. B., McQuaid, C. D., Russell, B. D., Smith, I. P., Swearer, S. E. & Todd, P. A. (gol.). Taylor & Francis, Cyfrol 58. t. 319-350

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Pennod › adolygiad gan gymheiriaid

  27. Cyhoeddwyd

    Bardsey – an island in a strong tidal stream: Underestimating coastal tides due to unresolved topography

    Green, M. & Pugh, D., 9 Tach 2020, Yn: Ocean Science. 16, 6, t. 1337–1345

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  28. Cyhoeddwyd

    Multi-century impacts of ice sheet retreat on sea level and ocean tides in Hudson Bay

    Hayden, A-M., Gomez, N., Wilmes, S-B. & Green, M., Tach 2020, Yn: Journal of Geophysical Research: Oceans. 125, 11

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  29. Cyhoeddwyd

    Comparing Water Level Estimation in Coastal and Shelf Seas From Satellite Altimetry and Numerical Models

    Rulent, J., Calafat, F., Banks, C., Bricheno, L., Gommenginger, C., Green, M., Haigh, I. D., Lewis, H. & Martin, A. C. H., 29 Hyd 2020, Yn: Frontiers in Marine Science. 7, 549467.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  30. Cyhoeddwyd

    Tides: A key environmental driver of osteichthyan evolution and the fish-tetrapod transition?

    Byrne, H. M., Green, J. A. M., Balbus, S. A. & Ahlberg, P. E., 28 Hyd 2020, Yn: Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences. 476, 2242, 1 t., 20200355.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  31. Cyhoeddwyd

    Internal tide driven tracer transport across the continental slope

    Spingys, C., Williams, R., Hopkins, J., Hall, R., Green, M. & Sharples, J., 17 Medi 2020, Yn: Journal of Geophysical Research: Oceans. 125, 9, e2019JC015530.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  32. Cyhoeddwyd

    On the interplay between horizontal resolution and wave drag and their effect on tidal baroclinic mode waves in realistic global ocean simulations

    Buijsman, M. C., Stephenson, G. R., Ansong, J. K., Arbic, B. K., Green, M., Richman, J. G., Shriver, J. F., Vic, C., Wallcraft, A. & Zhao, Z., Awst 2020, Yn: Ocean Modelling. 152, 101656.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  33. Cyhoeddwyd

    Tides on Other Earths: Implications for Exoplanet and Palaeo-Tidal Simulations

    Blackledge, B., Green, M., Barnes, R. & Way, M., 28 Meh 2020, Yn: Geophysical Research Letters. 47, 12, e2019GL085746.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  34. Cyhoeddwyd

    Stripping back the modern to reveal the Cenomanian-Turonian climate and temperature gradient underneath

    Laugie, M., Donnadieu, Y., Ladant, J-B., Green, M., Bopp, L. & Raisson, F., 5 Meh 2020, Yn: Climate of the Past. 16, 3, t. 953–971

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  35. Cyhoeddwyd

    Back to the future II: Four views of future tides

    Davies, H., Green, M. & Duarte, J., 20 Maw 2020, Yn: Earth system dynamics. 11, 1

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  36. Cyhoeddwyd

    The Tides They Are A-Changin': A Comprehensive Review of Past and Future Nonastronomical Changes in Tides, Their Driving Mechanisms, and Future Implications: A comprehensive review of past and future non‐astronomical changes in tides, their driving mechanisms and future implications

    Haigh, I. D., Pickering, M. D., Green, J. A. M., Arbic, B. K., Arns, A., Dangendorf, S., Hill, D. F., Horsburgh, K., Howard, T., Idier, D., Jay, D. A., Jaenicke, L., Lee, S. B., Mueller, M., Schindelegger, M., Talke, S. A., Wilmes, S-B. & Woodworth, P. L., Maw 2020, Yn: Reviews of Geophysics. 58, 1, e2018RG000636.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl adolygu › adolygiad gan gymheiriaid

  37. 2019
  38. Cyhoeddwyd

    The impacts of tidal energy development and sea-level rise in the Gulf of Maine

    Kresning, B., Hashemi, M. R., Neill, S. P., Green, M. & Xue, H., 15 Tach 2019, Yn: Energy. 187, 115942.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  39. Cyhoeddwyd

    The Increasing Prevalence of High Frequency Internal Waves in an Arctic Ocean With Declining Sea Ice Cover

    Rippeth, T., Vlasenko, V., Stashchuk, N., Koslov, I., Scannell, B., Green, M., Lincoln, B. & Lenn, Y-D., 11 Tach 2019, ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, OMAE2019-96621

    Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion Cynhadledd › Cyfraniad i Gynhadledd › adolygiad gan gymheiriaid

  40. Cyhoeddwyd

    Glacial ice sheet extent effects on modeled tidal mixing and the global overturning circulation

    Wilmes, S-B., Schmittner, A. & Green, M., Awst 2019, Yn: Paleoceanography. 34, 8, t. 1437-1454

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  41. Cyhoeddwyd

    Internal tides drive nutrient fluxes into the deep chlorophyll maximum over mid-ocean ridges

    Tuerena, R., Williams, R., Mahaffey, C., Green, M., Vic, C., Naveira-Garabato, A., Forryan, A. & Sharples, J., Awst 2019, Yn: Global Biogeochemical Cycles. 33, 8, t. 995-1009

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  42. Cyhoeddwyd

    Consequences of Tidal Dissipation in a Putative Venusian Ocean

    Green, J. A. M., Way, M. J. & Barnes, R., 10 Mai 2019, Yn: The Astrophysical Journal Letters. 876, 2, L22.

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  43. Cyhoeddwyd

    Deep-ocean mixing driven by small-scale internal tides

    Vic, C., Naveira-Garabato, A. C., Green, J. A. M., Waterhouse, A. F., Zhao, Z., Melet, A., de Lavergne, C., Buijsman, M. C. & Stephenson, G. R., 8 Mai 2019, Yn: Nature Communications. 10, 1, t. 2099 2099 (2019) .

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  44. Cyhoeddwyd

    Scale-dependent spatial patterns in benthic communities around a tropical island seascape

    Aston, E. A., Williams, G. J., Green, J. A. M., Davies, A. J., Wedding, L. M., Gove, J. M., Jouffray, J-B., Jones, T. T. & Clark, J., Maw 2019, Yn: Ecography. 42, 3, t. 578-590

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  45. Cyhoeddwyd

    The impact of sea-level rise on tidal characteristics around Australia

    Harker, A., Green, M., Schindelegger, M. & Wilmes, S-B., 19 Chwef 2019, Yn: Ocean Science. 15, 1, t. 147-159

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  46. 2018
  47. Cyhoeddwyd

    Back to the Future: Testing different scenarios for the next Supercontinent gathering

    Davies, H., Green, M. & Duarte, J., Hyd 2018, Yn: Global and Planetary Change. 169, t. 133-144

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  48. Cyhoeddwyd

    Can we model the effect of observed sea level rise on tides?

    Schindelegger, M., Green, M., Wilmes, S. B. & Haigh, I. D., 5 Gorff 2018, Yn: Journal of Geophysical Research: Oceans. 123, 7, t. 4593-4609

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  49. Cyhoeddwyd

    Is there a tectonically driven super-tidal cycle?

    Green, M., Molloy, J., Davies, H. & Duarte, J., 11 Ebr 2018, Yn: Geophysical Research Letters. 45, 8, t. 3568-3576

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  50. Cyhoeddwyd

    The Lifecycle of Semidiurnal Internal Tides over the Northern Mid-Atlantic Ridge

    Vic, C., Naveira-Garabato, A., Green, M., Spingys, C., Forryan, A., Zhao, Z. & Sharples, J., Ion 2018, Yn: Journal of Physical Oceanography. 48, 1, t. 61-80

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  51. 2017
  52. Cyhoeddwyd

    Tidal conversion and mixing poleward of the critical latitude (an Arctic case study)

    Rippeth, T., Vlasenko, V., Stashchuk, N., Scannell, B., Green, M., Lincoln, B. & Bacon, S., 28 Rhag 2017, Yn: Geophysical Research Letters. 44, 24, t. 12349-12357

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  53. Cyhoeddwyd

    Global tidal impacts of large-scale ice-sheet collapses

    Wilmes, S-B., Green, M., Gomez, M., Lau, H. & Rippeth, T., Tach 2017, Yn: Journal of Geophysical Research-Oceans. 122, 11, t. 8354-8370

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  54. Cyhoeddwyd

    Tuning, Interference and False Shallow Gas Signatures in Geohazard Interpretations: Beyond the 'λ/4' Rule

    Barret, B., Huws, D., Booth, A., Wergeland, O. & Green, M., Awst 2017, Yn: Near-surface Geophysics . 15, 4, t. 359-366

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  55. Cyhoeddwyd

    The double high tide at Port Ellen: Doodson's criterion revisited

    Byrne, H., Green, M. & Bowers, D., 20 Gorff 2017, Yn: Ocean Science. 13, t. 599-607

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  56. Cyhoeddwyd

    Explicitly modelled deep-time tidal dissipation and its implication for Lunar history

    Green, M., Huber, M., Waltham, D., Buzan, J. & Wells, M., 1 Maw 2017, Yn: Earth and Planetary Science Letters. 461, t. 46–53

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

  57. 2016
  58. Cyhoeddwyd

    Effects of future sea-level rise on tidal processes on the Patagonian Shelf

    Carless, S., Green, M., Pelling, H. & Wilmes, S-B., Tach 2016, Yn: Journal of Marine Systems. 163, November 2016, t. 113-124

    Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid

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