Katja Bohm

Size-resolved mineralogy and grain size-shape analysis of airborne and deposited mineral dust in northern China

Katja Bohm, Hui Tang, Bin Wang, Sergio Andò et autres

The chemical and physical properties of atmospheric mineral dust play a key role in determining its climatic and environmental effects. These properties also vary globally, highlighting the importance of observational studies and regional investigations in enhancing global models. One of the major …

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Spatial Source Contribution and Interannual Variation in Deposition of Dust Aerosols Over the Chinese Loess Plateau

Ove W. Haugvaldstad, Hui Tang, Anu Kaakinen, Katja Bohm et autres

Abstract The Chinese Loess Plateau (CLP) in northern China is home to one of the most prominent loess records in the world, reflecting past eolian dust activity in East Asia. However, their interpretation is hampered by ambiguity in the origin of loess‐forming …

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Modern‐Type Eolian Regime and Global Cooling‐Modulated Dust Provenance in the Late Paleogene of Central‐East Asia

Katja Bohm, Joonas Wasiljeff, Thomas C. Stevens, Johanna Salminen et autres

Abstract Atmospheric mineral dust is a poorly constrained yet extremely important component of the climate system. Provenance studies from geologic dust archives are crucial to understand the drivers of the dust cycle over long time scales. Our multi‐technique provenance analysis of a …

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Spatial source contribution and interannual variation in deposition of dust aerosols over the Chinese Loess Plateau

Ove W. Haugvaldstad, Hui Tang, Anu Kaakinen, Christine Groot Zwaaftink et autres

The Chinese Loess Plateau (CLP) in northern China serves one of the most prominent loess records in the world. The CLP is an extensive record of changes in past aeolian dust activity in East Asia; however, the interpretation of the loess records …

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Paleogene to Neogene aeolian dust provenance in the Chinese Loess Plateau region

Katja Bohm, Anu Kaakinen, Thomas C. Stevens, Yann Lahaye et autres

Understanding atmospheric circulation in the geologic past under warm climates is crucial for projection of future climate scenarios. One of the few ways to unravel past atmospheric circulation is to study aeolian mineral dust deposits that link the geosphere to the atmosphere. …

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Neogene global climate change and East Asian dust sources: Combined rutile geochemistry and zircon U-Pb analysis from the northern Chinese Loess Plateau

Katja Bohm, Anu Kaakinen, Thomas C. Stevens, Yann Lahaye et autres

During the late Neogene, global climate underwent a long-term transition to cooler climates that culminated in the Quaternary icehouse conditions. In the East Asian terrestrial realm, atmospheric dustiness increased, and the volume of aeolian dust deposits expanded significantly. The Neogene Red Clay …

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Age, geochemistry, and origin of the mid-Proterozoic Hame mafic dyke swarm, southern Finland

Arto V. Luttinen, Elina Lehtonen, Katja Bohm, Tanja Lindholm et autres

We have reappraised the age and composition of the mid-Proterozoic Häme dyke swarm in southern Finland. The dominant trend of the dykes of this swarm is NW to WNW. Petrographic observations and geochemical data indicate uniform, tholeiitic low- Mg parental magmas for …

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The provenance of late Cenozoic East Asian Red Clay: Tectonic-metamorphic history of potential source regions and a novel combined zircon-rutile approach

Katja Bohm, Thomas C. Stevens, Anu Kaakinen, Yann Lahaye et autres

Constraining the provenance of aeolian mineral dust is critical in understanding past climate changes, atmospheric dust activity, circulation, and sediment generation. On the Chinese Loess Plateau (CLP), use of detrital zircon U-Pb age data as source tracers for the dust has seen …

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Provenance of the late Neogene aeolian Baode Red Clay in northern Chinese Loess Plateau by combined rutile geochemical and zircon U-Pb analysis

Katja Bohm, Anu Kaakinen, Thomas C. Stevens, Yann Lahaye et autres

Understanding the provenance of aeolian dust deposits is essential for identifying past atmospheric circulation patterns and sediment generation. Knowledge of dust provenance not only reveals variations in the dust transportation paths and dust availability, but also increases our understanding of the climatic …

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Geochemical and paleomagnetic constraints on mid-Proterozoic mafic dyke emplacement events in southern Finland

Katja Bohm

Keskiproterotsooiset mafiset juoniparvet eteläisessä Suomessa liittyvät rapakivimagmatismiin. Näitä juoniparvia kutsutaan ”subjotunisiksi” (1,64–1,54 Ga), koska ne edeltävät jotunisia hiekkakiviä. Tässä työssä tutkittiin mafisia juonia viidestä eri juoniparvesta, jotka sijaitsevat Ahvenanmaalla, Satakunnassa, Hämeessä, Suomenniemellä ja Sipoossa. Yhteensä 110 kivinäytteelle, jotka oli aiemmin kerätty 101 …