A5052559528- Geology and Paleoclimatology Research
- Tree-ring climate responses
- Climate variability and models
- Archaeology and ancient environmental studies
- Geological Studies and Exploration
- Scientific Research and Discoveries
- Methane Hydrates and Related Phenomena
- Geological and Geochemical Analysis
- Cryospheric studies and observations
- Pleistocene-Era Hominins and Archaeology
- Marine and environmental studies
University of Oslo
2021-2024
Oeschger Centre for Climate Change Research
2023-2024
University of Bern
2023-2024
Abstract Understanding climate variability across interannual to centennial timescales is critical, as it encompasses the natural range of fluctuations that early human agricultural societies had adapt to. Deviations from long-term mean are often associated with both societal collapse and periods prosperity expansion. Here, we show contrary what global paleoproxy reconstructions suggest, mid late-Holocene was not a period stability. We use mid- Earth System Model simulations, forced by...
Abstract. The climate of the Northern Hemisphere (NH) in mid-6th century was one coldest during last 2 millennia based on multiple paleo-proxies. While onset this cold period can be clearly connected to volcanic eruptions 536 and 540 Common Era (CE), duration, extent, magnitude are uncertain. Proxy data sparse for first millennium, which compounds uncertainties reconstructions. To better understand mechanisms prolonged cooling, we analyze new transient simulations over enhance representation...
Abstract. In the Northern Hemisphere, mid-6th century was one of coldest periods last 2000 years, which initiated by volcanic eruptions in 536 and 540 CE. Here, we study effect this double event on climate society Scandinavia with a special focus southern Norway. Using an ensemble Max Planck Institute Earth system model transient simulations for 521–680 CE, temperature, precipitation, atmospheric circulation patterns are analyzed. The simulated cooling magnitude is used as input growing...
Abstract. The climate in the Northern Hemisphere (NH) of mid-6th century was one coldest during last two millennia. onset this cold period is attributed to volcanic double eruption event 536 and 540 Common Era (CE) based on multiple paleo-proxies. Recently, there has been a debate about how long lasting induced actually was. To better understand this, we analyze new transient simulations over enhance representation mid 6th 7th by additional ensemble covering 520–680 CE. We use Max Planck...
Abstract. In the Northern Hemisphere, mid-6th century was one of coldest periods last 2000 years, as indicated by both proxy records and Earth System Model (ESM) simulations. This cold period initiated volcanic eruptions in 536 CE 540 CE. Evidence from historical sources, archaeological findings, suggests that extent severity this induced cooling spatially heterogeneous effect on society resulted adaptation resilience at some locations, whereas social crisis has been others. Here, we study...
Large volcanic eruptions are key time markers in paleoclimatology because they inject large quantities of fallout (such as sulfuric acids and tephra) into the atmosphere which is then widely distributed deposited environmental archives such ice cores, lakes peat bogs. They also produce strong climate effects, imprinted tree-rings. The caldera-forming eruption Mount Mazama (Crater Lake, Oregon, USA) some 7700 years ago ranks among largest Holocene but little known about its exact timing...
Abstract. The decadal to centennial scale climate variability of the past 4000 years consists colder and warmer periods, potentially initiated by fast varying external forcing, or lack thereof. These alternating cold warm periods are most clearly visualized waxing waning glaciers in Northern Hemisphere. However, these neither spatially nor temporally consistent, using defined interpret local variations society could prove difficult. Here, we use two global earth system models, as well...
<p>The mid-6<sup>th</sup> century is an outstanding period in climate history featuring one of the coldest decades past 2000 years. It was triggered by 536/540 CE volcanic double event, creating strongest decadal forcing last two millennia. <span>T</span>h<span>e centuries the</span> first millennium <span>are</span> characterized great societal...
<p>The mid of the 6<sup>th</sup> century is an outstanding period and started with unusual cold that lasted several years to decades, due 536/540 CE double eruption event, strongest decadal volcanic forcing in last 2000 years. Evidence from multiple tree ring records Alps Altai Mountains Russia identified a centennial cooling lasting 536 up 660 CE. A previous Earth System Model (ESM) study reconstructed covering 535-550 like conditions already found...
<p>Large volcanic eruptions that reach the stratosphere cool surface climate and impact atmospheric circulation, feeding back on local climate. The mid-6<sup>th</sup> century is an outstanding period in history featured extreme cold period, including one of coldest decades past 2000 years. It was triggered by 536/540 CE double event, creating strongest decadal forcing last two millennia. During this societal changes are recorded around world, like...