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Professor GEORGE SWANN's Outputs (77)

The Branched GDGT Isomer Ratio Refines Lacustrine Paleotemperature Estimates (2025)
Journal Article
Novak, J. B., Russell, J. M., Lindemuth, E. R., Prokopenko, A. A., Pérez‐Angel, L., Zhao, B., Swann, G. E. A., & Polissar, P. J. (2025). The Branched GDGT Isomer Ratio Refines Lacustrine Paleotemperature Estimates. Geochemistry, Geophysics, Geosystems, 26(3), Article e2024GC012069. https://doi.org/10.1029/2024gc012069

Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are membrane-spanning lipids synthesized by bacteria in numerous substrates. The degree of methylation of the five methyl brGDGTs in both soils and lake sediments, described by the MBT′5Me inde... Read More about The Branched GDGT Isomer Ratio Refines Lacustrine Paleotemperature Estimates.

Enhanced phosphorus weathering contributed to Late Miocene cooling (2025)
Journal Article
Zhong, Y., Li, Z., Shi, X., Isson, T., Yu, J., Kender, S., Liang, Z., Swann, G. E., Pullen, A., Weber, M. E., Du, J., Larrasoaña, J. C., Zhang, J., Song, Y., González, F. J., Kaboth-Bahr, S., Li, H., Zhang, Q., Zhao, D., Cao, W., …Liu, Q. (2025). Enhanced phosphorus weathering contributed to Late Miocene cooling. Nature Communications, 16(1), Article 1124. https://doi.org/10.1038/s41467-025-56477-7

Late Miocene climate evolution provides an opportunity to assess Earth’s climate sensitivity to carbon cycle perturbation under warmer-than-modern conditions. Despite its relevance for understanding the climate system, the driving mechanisms underlyi... Read More about Enhanced phosphorus weathering contributed to Late Miocene cooling.

Carbon Cycle and Circulation Change in the North Pacific Ocean at the Initiation of Northern Hemisphere Glaciation Constrained by Boron-Based Proxies in Diatoms (2024)
Journal Article
Donald, H. K., Swann, G. E., Rae, J. W., & Foster, G. L. (2024). Carbon Cycle and Circulation Change in the North Pacific Ocean at the Initiation of Northern Hemisphere Glaciation Constrained by Boron-Based Proxies in Diatoms. Paleoceanography and Paleoclimatology, 39(11), Article e2024PA004968. https://doi.org/10.1029/2024pa004968

The intensification of Northern Hemisphere glaciation (iNHG) at 2.73Ma is associated with a reorganization of the subarctic Pacific Ocean and abrupt drop in opal mass accumulation rates. Uncertainty, however, remains around the extent to which these... Read More about Carbon Cycle and Circulation Change in the North Pacific Ocean at the Initiation of Northern Hemisphere Glaciation Constrained by Boron-Based Proxies in Diatoms.

Dual impacts of hydrology and damming on eutrophication: Comparison of two Ramsar wetlands in the middle Yangtze floodplain (2024)
Journal Article
Zeng, L., Engels, S., Swann, G. E., Chen, X., Huang, X., Cao, Y., & McGowan, S. (2024). Dual impacts of hydrology and damming on eutrophication: Comparison of two Ramsar wetlands in the middle Yangtze floodplain. Journal of Hydrology, 641, Article 131839. https://doi.org/10.1016/j.jhydrol.2024.131839

Dam construction for social-economic benefits has raised substantial biological and ecological concerns. However, contrasting findings have been reported regarding the role of hydrological modification in floodplain lake ecosystems. Here, we evaluate... Read More about Dual impacts of hydrology and damming on eutrophication: Comparison of two Ramsar wetlands in the middle Yangtze floodplain.

South Georgia marine productivity over the past 15 ka and implications for glacial evolution (2024)
Journal Article
Wilkin, J. T., Kender, S., Dejardin, R., Allen, C. S., Peck, V. L., Swann, G. E., McClymont, E. L., Scourse, J. D., Littler, K., & Leng, M. J. (2024). South Georgia marine productivity over the past 15 ka and implications for glacial evolution. Journal of Micropalaeontology, 43(1), 165-186. https://doi.org/10.5194/jm-43-165-2024

The subantarctic islands of South Georgia are located in the Southern Ocean, and they may be sensitive to future climate warming. However, due to a lack of well-dated subantarctic palaeoclimate archives, there is still uncertainty about South Georgia... Read More about South Georgia marine productivity over the past 15 ka and implications for glacial evolution.

A global compilation of diatom silica oxygen isotope records from lake sediment – trends and implications for climate reconstruction (2024)
Journal Article
Meister, P., Alexandre, A., Bailey, H., Barker, P., Biskaborn, B. K., Broadman, E., Cartier, R., Chapligin, B., Couapel, M., Dean, J. R., Diekmann, B., Harding, P., Henderson, A. C., Hernandez, A., Herzschuh, U., Kostrova, S. S., Lacey, J., Leng, M. J., Lücke, A., MacKay, A. W., …Meyer, H. (2024). A global compilation of diatom silica oxygen isotope records from lake sediment – trends and implications for climate reconstruction. Climate of the Past, 20(2), 363-392. https://doi.org/10.5194/cp-20-363-2024

Oxygen isotopes in biogenic silica (δ18OBSi) from lake sediments allow for quantitative reconstruction of past hydroclimate and proxy-model comparison in terrestrial environments. The signals of individual records have been attributed to different fa... Read More about A global compilation of diatom silica oxygen isotope records from lake sediment – trends and implications for climate reconstruction.

Sea level controls on the provenance of fine-grained sediments in the Xisha Trough, northwestern South China Sea over the last ~30 ka (2023)
Journal Article
Zhang, Q., Swann, G. E., Liu, J., Gao, W., Cui, Z., Li, G., Zhao, X., & Li, W. (2023). Sea level controls on the provenance of fine-grained sediments in the Xisha Trough, northwestern South China Sea over the last ~30 ka. Marine Geology, 466, Article 107184. https://doi.org/10.1016/j.margeo.2023.107184

The Xisha Trough situated in the northwestern South China Sea (SCS), plays a pivotal role in transporting sediments from the Red River into the deep-sea basin of the SCS, and thus is a critical place to examine variations in source-to-sink process of... Read More about Sea level controls on the provenance of fine-grained sediments in the Xisha Trough, northwestern South China Sea over the last ~30 ka.

Climate Evolution Through the Onset and Intensification of Northern Hemisphere Glaciation (2023)
Journal Article
McClymont, E. L., Ho, S. L., Ford, H. L., Bailey, I., Berke, M. A., Bolton, C. T., De Schepper, S., Grant, G. R., Groeneveld, J., Inglis, G. N., Karas, C., Patterson, M. O., Swann, G. E., Thirumalai, K., White, S. M., Alonso-Garcia, M., Anand, P., Hoogakker, B. A., Littler, K., Petrick, B. F., …Tangunan, D. (2023). Climate Evolution Through the Onset and Intensification of Northern Hemisphere Glaciation. Reviews of Geophysics, 61(3), Article e2022RG000793. https://doi.org/10.1029/2022rg000793

The Pliocene Epoch (∼5.3–2.6 million years ago, Ma) was characterized by a warmer than present climate with smaller Northern Hemisphere ice sheets, and offers an example of a climate system in long-term equilibrium with current or predicted near-futu... Read More about Climate Evolution Through the Onset and Intensification of Northern Hemisphere Glaciation.

An effective method to extract and purify radiolaria from tropical marine sediments (2023)
Journal Article
Zhang, Q., & Swann, G. E. (2023). An effective method to extract and purify radiolaria from tropical marine sediments. Frontiers in Marine Science, 10, Article 1150518. https://doi.org/10.3389/fmars.2023.1150518

Radiolaria are the primary contributors to biogenic opal in the tropical ocean, and their isotope compositions are potentially useful tool for reconstructing the silicon cycle in mid-depth waters. To date little attention has been paid to their isoto... Read More about An effective method to extract and purify radiolaria from tropical marine sediments.

Isotope sample preparation of diatoms for paleoenvironmental research (2023)
Journal Article
Swann, G. E., & Snelling, A. (2023). Isotope sample preparation of diatoms for paleoenvironmental research. PLoS ONE, 18(2), Article e0281511. https://doi.org/10.1371/journal.pone.0281511

Isotopes in diatoms are increasingly used in palaeoenvironmental studies in both lacustrine and marine settings, enabling the reconstruction of a range of variables including temperature, precipitation, salinity, glacial discharge, carbon dynamics an... Read More about Isotope sample preparation of diatoms for paleoenvironmental research.

Ecosystem deterioration in the middle Yangtze floodplain lakes over the last two centuries: Evidence from sedimentary pigments (2023)
Journal Article
Zeng, L., Swann, G. E., Leng, M. J., Chen, X., Ji, J., Huang, X., & McGowan, S. (2023). Ecosystem deterioration in the middle Yangtze floodplain lakes over the last two centuries: Evidence from sedimentary pigments. Quaternary Science Reviews, 302, Article 107954. https://doi.org/10.1016/j.quascirev.2023.107954

Water quality of floodplain lakes in the Yangtze region which supports ca. 450 million people is being severely compromised by nutrient pollution, climate change and dam installation resulting from intensive socio-economic development. However, due t... Read More about Ecosystem deterioration in the middle Yangtze floodplain lakes over the last two centuries: Evidence from sedimentary pigments.

Eutrophication has a greater influence on floodplain lake carbon cycling than dam installation across the middle Yangtze region (2022)
Journal Article
Zeng, L., McGowan, S., Swann, G. E., Leng, M. J., & Chen, X. (2022). Eutrophication has a greater influence on floodplain lake carbon cycling than dam installation across the middle Yangtze region. Journal of Hydrology, 614, Article 128510. https://doi.org/10.1016/j.jhydrol.2022.128510

Carbon cycling in shallow floodplain lakes is complex due to variability in delivery of flood-derived allochthonous organic matter (OM). Human activities have potential to significantly modify the carbon balance of lakes by damming which restricts ex... Read More about Eutrophication has a greater influence on floodplain lake carbon cycling than dam installation across the middle Yangtze region.

Nutrient availability in the North Pacific region not primarily driven by climate through the Quaternary (2022)
Journal Article
Snelling, A. M., Swann, G. E., Pashley, V., Lacey, J. H., Horstwood, M. S., & Leng, M. J. (2022). Nutrient availability in the North Pacific region not primarily driven by climate through the Quaternary. Palaeogeography, Palaeoclimatology, Palaeoecology, 601, Article 111109. https://doi.org/10.1016/j.palaeo.2022.111109

The subarctic North Pacific Ocean is a relatively understudied region in terms of palaeoclimate, limiting our understanding of how the region has both driven and responded to palaeoenvironmental events. Today, the subarctic North Pacific Ocean is mar... Read More about Nutrient availability in the North Pacific region not primarily driven by climate through the Quaternary.

Long-term trends in diatom diversity and palaeoproductivity: a 16000-year multidecadal record from Lake Baikal, southern Siberia (2022)
Journal Article
Mackay, A. W., Felde, V. A., Morley, D. W., Piotrowska, N., Rioual, P., Seddon, A. W., & Swann, G. E. (2022). Long-term trends in diatom diversity and palaeoproductivity: a 16000-year multidecadal record from Lake Baikal, southern Siberia. Climate of the Past, 18(2), 363-380. https://doi.org/10.5194/cp-18-363-2022

Biological diversity is inextricably linked to community stability and ecosystem functioning, but our understanding of these relationships in freshwater ecosystems is largely based on short-term observational, experimental, and modelling approaches.... Read More about Long-term trends in diatom diversity and palaeoproductivity: a 16000-year multidecadal record from Lake Baikal, southern Siberia.

Silicic Acid Cycling in the Bering Sea During the Mid-Pleistocene Transition (2022)
Journal Article
Worne, S., Swann, G. E., Kender, S., Lacey, J. H., & Leng, M. J. (2022). Silicic Acid Cycling in the Bering Sea During the Mid-Pleistocene Transition. Paleoceanography and Paleoclimatology, 37(2), Article e2021PA004284. https://doi.org/10.1029/2021PA004284

The rate of deep-ocean carbon burial is considered important for modulating glacial-interglacial atmospheric CO2 concentrations and global climate during the Quaternary. It has been suggested that glacial iron fertilization and increased efficiency o... Read More about Silicic Acid Cycling in the Bering Sea During the Mid-Pleistocene Transition.

Anthropocene climate warming enhances autochthonous carbon cycling in an upland Arctic lake, Disko Island, West Greenland (2021)
Journal Article
Stevenson, M. A., Mcgowan, S., Pearson, E. J., Swann, G. E., Leng, M. J., Jones, V. J., Bailey, J. J., Huang, X., & Whiteford, E. (2021). Anthropocene climate warming enhances autochthonous carbon cycling in an upland Arctic lake, Disko Island, West Greenland. Biogeosciences, 18(8), 2465-2485. https://doi.org/10.5194/bg-18-2465-2021

The Arctic is rapidly changing, disrupting biogeochemical cycles and the processing, delivery and sedimentation of carbon (C), in linked terrestrial-aquatic systems. In this investigation, we coupled a hydrogeomorphic assessment of catchment soils, s... Read More about Anthropocene climate warming enhances autochthonous carbon cycling in an upland Arctic lake, Disko Island, West Greenland.

Sea-ice response to climate change in the Bering Sea during the Mid-Pleistocene Transition (2021)
Journal Article
Worne, S., Stroynowski, Z., Kender, S., & Swann, G. (2021). Sea-ice response to climate change in the Bering Sea during the Mid-Pleistocene Transition. Quaternary Science Reviews, 259, Article 106918. https://doi.org/10.1016/j.quascirev.2021.106918

Sea-ice is believed to be an important control on climatic changes through the Mid-Pleistocene Transition (MPT; 0.6-1.2 Ma). However, the low resolution/short timescale of existing reconstructions prevents a full evaluation of these dynamics. Here, d... Read More about Sea-ice response to climate change in the Bering Sea during the Mid-Pleistocene Transition.

Changing nutrient cycling in Lake Baikal, the world’s oldest lake (2020)
Journal Article
Swann, G. E. A., Panizzo, V. N., Piccolroaz, S., Pashley, V., Horstwood, M., Roberts, S., Vologina, E., Piotrowska, N., Sturm, M., Zhdanov, A., Granin, N., Norman, C., McGowan, S., & Mackay, A. W. (2020). Changing nutrient cycling in Lake Baikal, the world’s oldest lake. Proceedings of the National Academy of Sciences, 117(44), 27211-27217. https://doi.org/10.1073/pnas.2013181117

Copyright © 2020 the Author(s). Published by PNAS. Lake Baikal, lying in a rift zone in southeastern Siberia, is the world's oldest, deepest, and most voluminous lake that began to form over 30 million years ago. Cited as the "most outstanding exampl... Read More about Changing nutrient cycling in Lake Baikal, the world’s oldest lake.

Glacial discharge into the subarctic Northeast Pacific Ocean during the last glacial (2020)
Journal Article
Swann, G. (2020). Glacial discharge into the subarctic Northeast Pacific Ocean during the last glacial. Global and Planetary Change, 194, Article 103301. https://doi.org/10.1016/j.gloplacha.2020.103301

Understanding the response of the climate to abrupt changes in the Earth system represents a key objective in paleoclimatology. Heinrich events in the last glacial, during which significant amounts of glacial discharge entered the North Atlantic Ocea... Read More about Glacial discharge into the subarctic Northeast Pacific Ocean during the last glacial.