Anne Hope Jahren er Wilson Professor på Senter for Jordens utvikling og dynamikk (CEED).
The Jahren Lab
The Jahren Laboratory - A Stable Isotope Biogeochemistry Laboratory ved CEED og Institutt for geofag, UiO.
Publikasjoner
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Wilkes, Elise B.; Sessions, Alex L.; Zeichner, Sarah S.; Dallas, Brooke; Schubert, Brian & Jahren, Anne Hope Florine
[Vis alle 7 forfattere av denne artikkelen]
(2022).
Position-specific carbon isotope analysis of serine by gas chromatography/Orbitrap mass spectrometry, and an application to plant metabolism.
Rapid Communications in Mass Spectrometry.
ISSN 0951-4198.
36(18).
doi:
10.1002/rcm.9347.
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Bajard, Manon Juliette Andree; Ballo, Eirik Gottschalk; Høeg, Helge Irgens; Bakke, Jostein; Støren, Eivind Wilhelm Nagel & Loftsgarden, Kjetil
[Vis alle 11 forfattere av denne artikkelen]
(2022).
Climate adaptation of pre-Viking societies.
Quaternary Science Reviews.
ISSN 0277-3791.
278.
doi:
10.1016/j.quascirev.2022.107374.
Fulltekst i vitenarkiv
Vis sammendrag
Understanding how the Viking societies were impacted by past climate variability and how they adapted to it has hardly been investigated. Here, we have carried out a new multi-proxy investigation of lake sediments, including geochemical and palynological analyses, to reconstruct past changes in temperature and agricultural practices of pre-Viking and Viking societies in Southeastern Norway during the period between 200 and 1300 CE. The periods 200–300 and 800–1300 CE were warmer than the 300–800 CE period, which is known as the “Dark Ages Cold Period”. This cold period was punctuated by century-scale more temperate intervals, which were dominated by the cultivation of cereals and hemp (before 280 CE, 420–480 CE, 580–700 CE, and after 800 CE). In between, cold intervals were dominated by livestock farming. Our results demonstrate that the pre-Viking societies changed their agricultural strategy in response to climate variability during the Late Antiquity.
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Tabor, Neil J.; Jahren, Anne Hope Florine; Wyman, Lani; Feseha, Mulugeta; Todd, Lawrence & Kappleman, John
(2021).
Stable isotope geochemistry of the modern shinfa river, northwestern ethiopian lowlands: A potential model for interpreting ancient environments of the middle stone age.
Geological Society Special Publication.
ISSN 0305-8719.
507,
s. 225–253.
doi:
10.1144/SP507-2020-219.
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Liu, Sarah; Moore, Lori B.; Halliday, Tanya M.; Jahren, Anne Hope; Savla, Jyoti & Hedrick, Valisa E.
[Vis alle 8 forfattere av denne artikkelen]
(2018).
Short-term changes in added sugar consumption by adolescents reflected in the carbon isotope ratio of fingerstick blood .
Nutrition and Health.
ISSN 0260-1060.
24(4),
s. 251–259.
doi:
10.1177/0260106018799522.
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Bostic, Joshua Neilson; Hagopian, William Martin & Jahren, Anne Hope
(2018).
Carbon and nitrogen stable isotopes in U.S. milk: Insight into production process.
Rapid Communications in Mass Spectrometry.
ISSN 0951-4198.
32(7),
s. 561–566.
doi:
10.1002/rcm.8069.
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Hagopian, William Martin; Schubert, Brian A; Graper, Robert A & Jahren, Anne Hope
(2018).
Plant growth chamber design for subambient pCO2 and δ13C C studies.
Rapid Communications in Mass Spectrometry.
ISSN 0951-4198.
32(15),
s. 1296–1302.
doi:
10.1002/rcm.8176.
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MacDougall, Carly R.; Hill, Catelyn E.; Jahren, Anne Hope; Salva, Jyoti; Riebl, Shaun K. & Hedrick, Valissa E.
[Vis alle 10 forfattere av denne artikkelen]
(2018).
The δ13C Value of Fingerstick Blood Is a Valid, Reliable, and Sensitive Biomarker of Sugar-Sweetened Beverage Intake in Children and Adolescents.
Journal of Nutrition.
ISSN 0022-3166.
148,
s. 147–152.
doi:
10.1093/jn/nxx017.
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Rabanus-Wallace, M. Timothy; Wooller, Matthew J.; Zazula, Grant D.; Shute, Elen; Jahren, Anne Hope & Kosintsev, Pavel
[Vis alle 10 forfattere av denne artikkelen]
(2017).
Megafaunal isotopes reveal role of increased moisture on rangeland during late Pleistocene extinctions.
Nature Ecology and Evolution.
ISSN 2397-334X.
1(5).
doi:
10.1038/s41559-017-0125.
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Schubert, Brian A; Jahren, Anne Hope; Davydov, Sergei P & Warny, Sophie
(2017).
The transitional climate of the late Miocene Arctic: Winterdominated precipitation with high seasonal variability.
Geology.
ISSN 0091-7613.
45(5),
s. 447–450.
doi:
10.1130/G38746.1.
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Jahren, Anne Hope Florine; Conrad, Clinton Phillips; Arens, Nan Crystal; Mora, German & Lithgow-Bertelloni, Carolina
(2005).
A plate tectonic mechanism for methane hydrate release along subduction zones.
Earth and Planetary Science Letters.
ISSN 0012-821X.
236,
s. 691–704.
doi:
10.1016/j.epsl.2005.06.009.
Se alle arbeider i Cristin
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Schubert, Brian A.; Cui, Ying & Jahren, Anne Hope Florine
(2021).
A 23 m.y. record of low atmospheric CO2.
Geology.
ISSN 0091-7613.
49(6).
doi:
10.1130/G49093Y.1.
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Holland, Petter; Hagopian, William Martin; Jahren, Anne Hope Florine & Rusten, Tor Erik
(2021).
Natural abundance isotope ratios to differentiate sources of carbon used during tumor growth in vivo.
BMC Biology.
ISSN 1741-7007.
19(1),
s. 1–10.
doi:
10.1186/s12915-021-01012-5.
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Bajard, Manon Julietto Andree; Ballo, Eirik Magnus Gottschalk; Høeg, Helge I.; Bakke, Jostein; Støren, Eivind N. & Loftsgarden, Kjetil
[Vis alle 11 forfattere av denne artikkelen]
(2021).
Instability or adaptation of the pre-Viking society to the climate variability of the Late Antiquity?
Vis sammendrag
Understanding how agricultural societies were impacted and adapted to past climate variations is critical to adapt to contemporary climate change and guaranty the food security. However, linking climate and change in the behaviour of a population are difficult to evidence. Here, we studied the climate variations of the period between 200 and 1300 CE and its impact on the pre-Viking and Viking societies in south Norway. We used a retrospective approach combining a multi-proxy analysis of lake sediments, including geochemical and palynological analyses, to reconstruct past changes in temperature and agricultural practices during the period 200-1300 CE. We associated variations in Ca/Ti ratio as a result of change in lake productivity with the temperature. The periods 200-300 and 800-1300 CE were warmer than the period between 300 and 800 CE, which is known as the “Dark Ages Cold Period” in the Northern Hemisphere. During this colder period, phases dominated by grazing activities (280-420 CE, 480-580 CE, 700-780 CE) alternated with phases dominated by the cultivation of cereals and hemp (before 280 CE, 420-480 CE, 580-700 CE, and after 800 CE). The alternation of these phases is synchronous of temperature changes. Cold periods are associated to livestock farming, and warmer periods to crop farming. This result suggests that when temperature no longer allowed crop farming, the food production specialized in animal breeding. The development of activities reached a maximum between 400 and 550 CE and a minimum between 680 and 800 CE, in agreement with archaeological findings. The Viking Age (800-1000 CE) started with an increase in temperature and corresponds to the warmest period between 200 and 1300 CE, allowing a larger development of the agriculture practices and society. Our results prove that the pre-Viking society adapted their agricultural practices to the climate variability of the Late Antiquity and that the Vikings expanded with climate warming.
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Bostic, Joshua Neilson; Hagopian, William Martin; Svensen, Henrik & Jahren, Anne Hope
(2019).
Predicting seasonal climate using intra-ring stable isotope analysis.
Vis sammendrag
By emitting stratospheric sulphur aerosol clouds that dim the light-energy received from the sun, large-scale volcanic eruptions may cause acute changes in global climate that impact both natural ecosystems and human societies. One example is the 536 Event, a prolonged period of darkness and cooling across the northern hemisphere caused by two separate volcanic eruptions in 536 and 540 CE. Recent mean annual temperature (MAT) and mean annual precipitation (MAP) reconstructions suggest that the decade following the 536 event was one of the coldest and wettest of the past two millennia. This cold period likely contributed to the cultural upheavals that occurred in Scandinavia during the 6th century by reducing the geographic range suitable for cereal grain production. However, while annually-resolved MAT and MAP reconstructions are useful for identifying climatic perturbations, they provide limited insight into the effects of such climate anomalies on regional agricultural productivity due to their limited ability to differentiate summer and winter climatic conditions. To accurately estimate the number of days suitable for growing crops, or Growing Degree Days (GDD), seasonal resolution must be achieved by determining the ratio of summer to winter temperature and precipitation.
To reconstruct growing season temperature and precipitation across southern Scandinavia in the decade following the 536 event (535-545 CE), we will combine prior reconstructions of annual mean data with novel analyses of summer/winter temperature and precipitation ratios derived from intra-ring carbon and oxygen stable isotope analysis of Picea abies collected from Raknehaugen, a burial mound in southern Norway constructed in 551 CE. These growing season temperature and precipitation estimates will be combined with other geo-climatic data (latitude, altitude etc.) for regional GDD reconstruction to ultimately determine changes in the geographic range suitable for crop production in Southern Norway following the 536/540 double event. Here, we 1.) Provide a conceptual outline of the project’s expected outcomes and 2.) Demonstrate the ability of intra-ring stable isotope analysis to detect short-term seasonal climatic perturbations in Scandinavia by reconstructing the European summer drought of 1959 from estimates of summer/winter temperature and precipitation ratios derived from stable isotope patterns in Picea abies samples from two locations in southern Norway.
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Kvaalen, Harald; Jahren, Anne Hope; Skrøppa, Tore; Yakovlev, Igor & Fossdal, Carl Gunnar
(2011).
Grana - ein klimaluring med godt epigenetisk minne.
I Woxholtt, Severin (Red.),
Norsk institutt for skog og landskap. Årsmelding 2010.
Norsk institutt for skog og landskap.
s. 16–17.
Vis sammendrag
Epigenetikk er eit ord på veg inn i daglegtalen. No definert som arvelege endringar i framtoninga fenotypen) av eit individ som ikkje skuldast endringar i sjølve sekvensen av arvematerialet (DNA.) Epigenetikk er no eit av dei mest omtala forskingsområda i biologien.
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Publisert
20. aug. 2016 11:09
- Sist endret
3. juli 2023 12:00