Professor GEORGE SWANN's Outputs (77)

Lessons from a high-CO2 world: an ocean view from  ∼ 3 million years ago (2020)
Journal Article
McClymont, E. L., Ford, H. L., Ho, S. L., Tindall, J. C., Haywood, A. M., Alonso-Garcia, M., Bailey, I., Berke, M. A., Littler, K., Patterson, M. O., Petrick, B., Peterse, F., Ravelo, A. C., Risebrobakken, B., De Schepper, S., Swann, G. E. A., Thirumalai, K., Tierney, J. E., van der Weijst, C., White, S., …Zhang, Z. (2020). Lessons from a high-CO2 world: an ocean view from  ∼ 3 million years ago. Climate of the Past, 16(4), 1599-1615. https://doi.org/10.5194/cp-16-1599-2020

A range of future climate scenarios are projected for high atmospheric CO2 concentrations, given uncertainties over future human actions as well as potential environmental and climatic feedbacks. The geological record offers an opportunity to underst... Read More about Lessons from a high-CO2 world: an ocean view from  ∼ 3 million years ago.

Reduced upwelling of nutrient and carbon-rich water in the subarctic Pacific during the Mid-Pleistocene Transition (2020)
Journal Article
Worne, S., Kender, S., Swann, G. E., Leng, M. J., & Ravelo, A. C. (2020). Reduced upwelling of nutrient and carbon-rich water in the subarctic Pacific during the Mid-Pleistocene Transition. Palaeogeography, Palaeoclimatology, Palaeoecology, 555, Article 109845. https://doi.org/10.1016/j.palaeo.2020.109845

© 2020 Reduction in atmospheric pCO2 has been hypothesised as a causal mechanism for the Mid-Pleistocene Transition (MPT), which saw global cooling and increased duration of glacials between 0.6 and 1.2 Ma. Sea ice-modulated high latitude upwelling a... Read More about Reduced upwelling of nutrient and carbon-rich water in the subarctic Pacific during the Mid-Pleistocene Transition.

The pH dependency of the boron isotopic composition of diatom opal (Thalassiosira weissflogii) (2020)
Journal Article
Donald, H. K., Foster, G. L., Fröhberg, N., Swann, G. E. A., Poulton, A. J., Moore, C. M., & Humphreys, M. P. (2020). The pH dependency of the boron isotopic composition of diatom opal (Thalassiosira weissflogii). Biogeosciences, 17(10), 2825-2837. https://doi.org/10.5194/bg-17-2825-2020

The high-latitude oceans are key areas of carbon and heat exchange between the atmosphere and the ocean. As such, they are a focus of both modern oceanographic and palaeoclimate research. However, most palaeoclimate proxies that could provide a long-... Read More about The pH dependency of the boron isotopic composition of diatom opal (Thalassiosira weissflogii).

Mercury loading within the Selenga River basin and Lake Baikal, Siberia (2019)
Journal Article
Roberts, S., Adams, J. K., Mackay, A. W., Swann, G. E. A., McGowan, S., Rose, N. L., Panizzo, V., Yang, H., Vologina, E., Sturm, M., & Shchetnikov, A. A. (2020). Mercury loading within the Selenga River basin and Lake Baikal, Siberia. Environmental Pollution, 259, Article 113814. https://doi.org/10.1016/j.envpol.2019.113814

Mercury (Hg) loading in Lake Baikal, a UNESCO world heritage site, is growing and poses a serious health concern to the lake’s ecosystem due to the ability of Hg to transform into a toxic form, known as methylmercury (MeHg). Monitoring of Hg into Lak... Read More about Mercury loading within the Selenga River basin and Lake Baikal, Siberia.

PaCTS 1.0: A Crowdsourced Reporting Standard for Paleoclimate Data (2019)
Journal Article
Khider, D., Emile-Geay, J., McKay, N. P., Gil, Y., Garijo, D., Ratnakar, V., Alonso-Garcia, M., Bertrand, S., Bothe, O., Brewer, P., Bunn, A., Chevalier, M., Comas-Bru, L., Csank, A., Dassié, E., DeLong, K., Felis, T., Francus, P., Frappier, A., Gray, W., …Zhou, Y. (2019). PaCTS 1.0: A Crowdsourced Reporting Standard for Paleoclimate Data. Paleoceanography and Paleoclimatology, 34(10), 1570-1596. https://doi.org/10.1029/2019PA003632

The progress of science is tied to the standardization of measurements, instruments, and data. This is especially true in the Big Data age, where analyzing large data volumes critically hinges on the data being standardized. Accordingly, the lack of... Read More about PaCTS 1.0: A Crowdsourced Reporting Standard for Paleoclimate Data.

Coupled climate and subarctic Pacific nutrient upwelling over the last 850,000 years (2019)
Journal Article
Worne, S., Kender, S., Swann, G. E., Leng, M. J., & Ravelo, A. C. (2019). Coupled climate and subarctic Pacific nutrient upwelling over the last 850,000 years. Earth and Planetary Science Letters, 522, 87-97. https://doi.org/10.1016/j.epsl.2019.06.028

High latitude deep water upwelling has the potential to control global climate over glacial timescales through the biological pump and ocean-atmosphere CO2 exchange. However, there is currently a lack of continuous long nutrient upwelling records wit... Read More about Coupled climate and subarctic Pacific nutrient upwelling over the last 850,000 years.

Diatom evidence of 20th century ecosystem change in Lake Baikal, Siberia (2018)
Journal Article
Roberts, S., Swann, G., McGowan, S., Panizzo, V., Vologina, E., Sturm, M., & Mackay, A. (2018). Diatom evidence of 20th century ecosystem change in Lake Baikal, Siberia. PLoS ONE, 13(12), Article e020876. https://doi.org/10.1371/journal.pone.0208765

Lake Baikal has been experiencing limnological changes from recent atmospheric warming since the 1950s, with rising lake water temperatures, reduced ice cover duration and reduced lake surface-water mixing due to stronger thermal stratification. This... Read More about Diatom evidence of 20th century ecosystem change in Lake Baikal, Siberia.

Closure of the Bering Strait caused Mid-Pleistocene Transition cooling (2018)
Journal Article
Kender, S., Ravelo, A. C., Worne, S., Swann, G. E. A., Leng, M. J., Asahi, H., Becker, J., Detlef, H., Aiello, I. W., Andreasen, D., & Hall, I. R. (2018). Closure of the Bering Strait caused Mid-Pleistocene Transition cooling. Nature Communications, 9(1), Article 5386. https://doi.org/10.1038/s41467-018-07828-0

The Mid-Pleistocene Transition (MPT) is characterised by cooling and lengthening glacial cycles from 600–1200 ka, thought to be driven by reductions in glacial CO2 in particular from ~900 ka onwards. Reduced high latitude upwelling, a process that re... Read More about Closure of the Bering Strait caused Mid-Pleistocene Transition cooling.

Recent ecological change in ancient lakes (2018)
Journal Article
Hampton, S. E., McGowan, S., Ozersky, T., Virdis, S. G. P., Vu, T. T., Spanbauer, T. L., Kraemer, B. M., Swann, G., Mackay, A. W., Powers, S. M., Meyer, M. F., Labou, S. G., O'Reilly, C. M., DiCarlo, M., Galloway, A. W. E., & Fritz, S. C. (2018). Recent ecological change in ancient lakes. Limnology and Oceanography, 63(5), 2277-2304. https://doi.org/10.1002/lno.10938

Ancient lakes are among the best archivists of past environmental change, having experienced more than one full glacial cycle, a wide range of climatic conditions, tectonic events, and long association with human settlements. These lakes not only rec... Read More about Recent ecological change in ancient lakes.

Modelling silicon supply during the Last Interglacial (MIS 5e) at Lake Baikal (2018)
Journal Article
Panizzo, V., Swann, G., Mackay, A., Pashley, V., & Horstwood, M. (2018). Modelling silicon supply during the Last Interglacial (MIS 5e) at Lake Baikal. Quaternary Science Reviews, 190, https://doi.org/10.1016/j.quascirev.2018.04.006

Limnological reconstructions of primary productivity have demonstrated its response over Quaternary timescales to drivers such as climate change, landscape evolution and lake ontogeny. In particular, sediments from Lake Baikal, Siberia, provide a val... Read More about Modelling silicon supply during the Last Interglacial (MIS 5e) at Lake Baikal.

Late Pliocene Marine pCO2 Reconstructions From the Subarctic Pacific Ocean (2018)
Journal Article
Swann, G. E., Kendrick, C. P., Dickson, A. J., & Worne, S. (2018). Late Pliocene Marine pCO2 Reconstructions From the Subarctic Pacific Ocean. Paleoceanography and Paleoclimatology, 33(5), 457-469. https://doi.org/10.1029/2017PA003296

The development of large ice-sheets across the Northern Hemisphere during the late Pliocene and the emergence of the glacial-interglacial cycles that punctuate the Quaternary mark a significant threshold in Earth's climate history. Although a number... Read More about Late Pliocene Marine pCO2 Reconstructions From the Subarctic Pacific Ocean.

Lake Baikal isotope records of Holocene Central Asian precipitation (2018)
Journal Article
Swann, G. E., Mackay, A. W., Vologina, E., Jones, M. D., Panizzo, V., Leng, M. J., Sloane, H. J., Snelling, A. M., & Sturm, M. (2018). Lake Baikal isotope records of Holocene Central Asian precipitation. Quaternary Science Reviews, 189, https://doi.org/10.1016/j.quascirev.2018.04.013

Climate models currently provide conflicting predictions of future climate change across Central Asia. With concern over the potential for a change in water availability to impact communities and ecosystems across the region, an understanding of hist... Read More about Lake Baikal isotope records of Holocene Central Asian precipitation.

Spatial differences in dissolved silicon utilisation in Lake Baikal, Siberia: examining the impact of high diatom biomass events and eutrophication (2018)
Journal Article
Panizzo, V., Roberts, S., Swann, G. E., McGowan, S., Mackay, A. W., Vologina, E., Pashley, V., & Horstwood, M. S. (2018). Spatial differences in dissolved silicon utilisation in Lake Baikal, Siberia: examining the impact of high diatom biomass events and eutrophication. Limnology and Oceanography, 63(4), 1562-1578. https://doi.org/10.1002/lno.10792

Recent research has highlighted how Lake Baikal, Siberia, has responded to the direct and indirect effects of climate change (e.g., ice-cover duration), nutrient loading, and pollution, manifesting as changes in phytoplankton/zooplankton populations,... Read More about Spatial differences in dissolved silicon utilisation in Lake Baikal, Siberia: examining the impact of high diatom biomass events and eutrophication.

A review of the stable isotope bio-geochemistry of the global silicon cycle and its associated trace elements (2018)
Journal Article
Sutton, J. N., André, L., Cardinal, D., Conley, D. J., de Souza, G. F., Dean, J. R., Dodd, J., Ehlert, C., Ellwood, M. J., Frings, P. J., Grasse, P., Hendry, K., Leng, M. J., Michalopoulos, P., Panizzo, V. N., & Swann, G. E. (2018). A review of the stable isotope bio-geochemistry of the global silicon cycle and its associated trace elements. Frontiers in Earth Science, 5, Article 112. https://doi.org/10.3389/feart.2017.00112

Silicon (Si) is the second most abundant element in the Earth’s crust and is an important nutrient in the ocean. The global Si cycle plays a critical role in regulating primary productivity and carbon cycling on the continents and in the oceans. Deve... Read More about A review of the stable isotope bio-geochemistry of the global silicon cycle and its associated trace elements.

"Live” (stained) benthic foraminiferal living depths, stable isotopes, and taxonomy offshore South Georgia, Southern Ocean: implications for calcification depths (2018)
Journal Article
Dejardin, R., Kender, S., Allen, C. S., Leng, M. J., Swann, G. E., & Peck, V. L. (2018). "Live” (stained) benthic foraminiferal living depths, stable isotopes, and taxonomy offshore South Georgia, Southern Ocean: implications for calcification depths. Journal of Micropalaeontology, 37(1), 25-71. https://doi.org/10.5194/jm-37-25-2018

It is widely held that benthic foraminifera exhibit species-specific calcification depth preferences, with their tests recording sediment pore water chemistry at that depth (i.e. stable isotope and trace metal compositions). This assumed depth habita... Read More about "Live” (stained) benthic foraminiferal living depths, stable isotopes, and taxonomy offshore South Georgia, Southern Ocean: implications for calcification depths.

Constraining modern day silicon cycling in Lake Baikal (2017)
Journal Article
Panizzo, V., Swann, G. E., Mackay, A. W., Vologina, E., Alleman, L., Andre, L., Pashley, V., & Horstwood, M. S. (in press). Constraining modern day silicon cycling in Lake Baikal. Global Biogeochemical Cycles, 31(3), https://doi.org/10.1002/2016GB005518

Constraining the continental silicon cycle is a key requirement in attempts to understand both nutrient fluxes to the ocean and linkages between silicon and carbon cycling over different timescales. Silicon isotope data of dissolved silica (δ30SiDSi)... Read More about Constraining modern day silicon cycling in Lake Baikal.

Temporal controls on silicic acid utilisation along the West Antarctic Peninsula (2017)
Journal Article
Swann, G. E., Pike, J., Leng, M. J., Sloane, H. J., & Snelling, A. M. (2017). Temporal controls on silicic acid utilisation along the West Antarctic Peninsula. Nature Communications, 14645, https://doi.org/10.1038/ncomms14645

The impact of climatic change along the Antarctica Peninsula has been widely debated in light of atmospheric/oceanic warming and increases in glacial melt over the past half century. Particular concern exists over the impact of these changes on marin... Read More about Temporal controls on silicic acid utilisation along the West Antarctic Peninsula.

Holocene carbon dynamics at the forest – steppe ecotone of southern Siberia (2016)
Journal Article
Mackay, A. W., Seddon, A., Leng, M. J., Heumann, G., Morley, D., Piotrowska, N., Rioual, P., & Swann, G. E. (2017). Holocene carbon dynamics at the forest – steppe ecotone of southern Siberia. Global Change Biology, 23(5), https://doi.org/10.1111/gcb.13583

The forest–steppe ecotone in southern Siberia is highly sensitive to climate change; global warming is expected to push the ecotone northwards, at the same time resulting in degradation of the underlying permafrost. To gain a deeper understanding of... Read More about Holocene carbon dynamics at the forest – steppe ecotone of southern Siberia.

Ecology under lake ice (2016)
Journal Article
Hampton, S. E., Galloway, A. W., Powers, S. M., Ozersky, T., Woo, K. H., Batt, R. D., Labou, S. G., O'Reilly, C. M., Sharma, S., Lottig, N. R., Stanley, E. H., North, R. L., Stockwell, J. D., Adrian, R., Weyhenmeyer, G. A., Roberts, S., & Swann, G. E. (2017). Ecology under lake ice. Ecology Letters, 20(1), 98-111. https://doi.org/10.1111/ele.12699

Winter conditions are rapidly changing in temperate ecosystems, particularly for those that experience periods of snow and ice cover. Relatively little is known of winter ecology in these systems, due to a historical research focus on summer "growing... Read More about Ecology under lake ice.

Biogeochemical cycling in the Bering Sea over the onset of major Northern Hemisphere glaciation (2016)
Journal Article
Swann, G. E., Snelling, A. M., & Pike, J. (in press). Biogeochemical cycling in the Bering Sea over the onset of major Northern Hemisphere glaciation. Paleoceanography, 31(9), https://doi.org/10.1002/2016PA002978

The Bering Sea is one of the most biologically productive regions in the marine system and plays a key role in regulating the flow of waters to the Arctic Ocean and into the subarctic North Pacific Ocean. Cores from IODP Expedition 323 to the Bering... Read More about Biogeochemical cycling in the Bering Sea over the onset of major Northern Hemisphere glaciation.