Profiles

Fredrik Charpentier Ljungqvist

Fredrik Charpentier Ljungqvist

Forskare

Visa sidan på svenska
Works at Department of History
Telephone 08-16 35 11
Email fredrik.c.l@historia.su.se
Visiting address Universitetsvägen 10 D, plan 9
Room D 860
Postal address Historia 106 91 Stockholm

About me

Fredrik Charpentier Ljungqvist, Associate Professor, is an historian and palaeoclimatologist. Ljungqvist is author or co-author of more than 50 peer-reviewed articles in history and palaeoclimatology. He is author of two books about how climate changes have affected mankind throughout the course of history and of one book about the Late Iron Age and Medieval Scandinavia.

 

Affiliated researcher at the Bolin Centre for Climate Research, Stockholm University.

Scientific Steering Committee member of Integrated History and Future of People on Earth (IHOPE).

Editorial board member of the journal Historisk tidskrift.

Secretary for the Centre for Medieval Studies at Stockholm University June 2008–June 2018.

Awarded the Clio Prize 2016.

Visiting Researcher at the Department of Geography, University of Cambridge, United Kingdom, from October 2017–April 2018 and October 2018–April 2019.

Guest Professorship in Environmental Sciences at Lanzhou University, China, from 2017–2019.

Admitted in June 2018 as Pro Futura Scientia Fellow (with start July 1 2019) by the Swedish Collegium for Advanced Study.

Teaching

Fredrik Charpentier Ljungqvist has been teaching at the undergraduate and master programmes of the Department of History, Stockholm University, since 2007, and since 2010 at the history course for the Elementary School Teacher Education Programme, Stockholm University. Ljungqvist have been supervisor of more than 20 student writing bachelor thesis in history, and has been invited as a guest lecture, for courses on both advanced and doctoral level, both at other universities in Sweden and abroad in palaeoclimatology. He has also held numerous popular science lectures, in both history and palaeoclimatology, at museums, public libraries, local history societies and for non-profit associations.

Research

Bibliometric data

(5 APril, 2019, ISI Web of Knowledge [Google Scholar])

ISI Web of Knowledge [Google Scholar])

Publications: 49 [68]

Total citations: 1380 [2216]

Average citations: 28.16 [32.59]

H-index: 18 [20]

Highly Cited in Field (ISI): 5

Publications

A selection from Stockholm University publication database
  • 2018. Fredrik Charpentier Ljungqvist, Andrea Seim. Journal of Archaeological Science 21, 849-861

    The Late Viking Age Swedish runestones are commonly acknowledged as early Christian monuments. Using geostatistical techniques and descriptive statistics, we systematically investigate the regional-to-local spatiotemporal patterns of 1302 ornamentally dated Swedish runestones regarding the timing and speed of the Christianisation process. After quantitative geostatistical analyses of the age distribution patterns of Swedish runestones, we evaluate whether the observed patterns correspond to the pace and pattern of Christianisation, as represented by the presence of mission bishoprics, early church sites, late pagan grave sites and royal estates. We identify seven distinct age groups of runestones and statistically significant regional-to-local spatiotemporal differences in the age and age spread of runestones. The oldest runestones, with the smallest age spread, are found in south-western medieval Sweden, and the youngest, as well as the largest age spread, in the north-east, respectively. We find that runestones are significantly older close to early ecclesiastical sites, regardless of the analytical level, and significantly younger near to late pagan graves. The results obtained are inconclusive as to whether runestones are older near royal estates. Our results support that the spatiotemporal patterns of runestone sites mirror the timing of the Christianisation process and that geostatistical approaches to larger archaeological or historical data sets can add new dimensions to the understanding of the spatial dimensions of past societal changes.

  • 2017. Fredrik Charpentier Ljungqvist. Issues and Concepts in Historical Ecology, 41-83
  • 2017. Fredrik Charpentier Ljungqvist.

    I boken presenteras för första gången på svenska resultaten från den senaste klimathistoriska forskningen för en bred publik. I en välblandad mix av historia och klimatvetenskap får läsaren följa med på en medryckande resa genom världshistorien då kraftiga och plötsliga klimatförändringar emellanåt dramatiskt förändrat livsvillkoren för miljoner människor.

    För 6 000 år sedan var till exempel Sahara en frodig savann i stället för världens största öken, samtidigt som klimatet var varmt nog i Sverige för sköldpaddor och vilda vindruvor.  Senare under historien har stora variationer i monsunregnen i Asien gett upphov till antingen välstånd eller hungersnöd för miljontals människor.

    För tusen år sedan kollapsade indianska civilisationer av torka, samtidigt som ett varmare klimat tillät nordbor att kolonisera södra Grönland. Den så kallade lilla istiden, som kulminerade på 1600-talet, orsakade försörjningskriser i Europa och Kina och på många andra håll i världen.

    Författaren ger oss åtskilliga spännande och lärorika exempel på hur klimatförändringar under historien påverkat utvecklingen i olika delar av världen och hur människor hanterat eller inte hanterat konsekvenserna av klimatförändringar. Det är insikter som är mycket relevanta i vår tid.

  • 2017. Bo Christiansen, Fredrik Charpentier Ljungqvist. Reviews of geophysics 55 (1), 40-96

    Knowledge of the temperature variability during the last one to two millennia is important for providing a perspective to present-day climate excursions, for assessing the sensitivity of the climate to different forcings, and for providing a test bed for climate models. Since systematic instrumental temperature records only extend back to the nineteenth century, such knowledge mainly relies on climate-sensitive proxy data. Here we critically assess some of the many challenges related to large-scale multiproxy temperature reconstructions. We begin with a review of available large-scale temperature reconstructions, focusing on the differences in low-frequency variability and the response to natural forcings such as major volcanic eruptions and changes in total solar irradiance. Then, we discuss different proxy selection strategies, review previously used reconstruction methods, and discuss their ability to reconstruct the amplitude of the low-frequency variability. To shed additional light on the challenges of large-scale reconstructions, we investigate the spatial and temporal correlation structures in the observed temperature field and discuss the implications of these correlation structures regarding the required number and positions of proxies. We demonstrate how the unavoidable uncertainty related to noisy proxies will show up as bias and variance in the reconstruction and that the partition between these forms of errors depends on the reconstruction method. Pseudo-proxy experiments are conducted to further discuss the influence of noise and the requirements regarding the geographical location and number of proxies necessary for reliably reconstructing the low-frequency variability. We conclude with recommendations for future large-scale temperature reconstructions.

  • 2016. Fredrik Charpentier Ljungqvist.

    Denna bok behandlar lagregleringen av den expanderande kungamakten i det högmedeltida Danmark, Norge och Sverige ur ett komparativt perspektiv. Utifrån bevarat lagmaterial undersöks utvecklingen av kungamaktens rättsliga och militära befogenheter och funktioner i relation till tingsmenigheternas och kyrkans förändrade maktställning. Dessa statsrättsliga frågeställningar, som ägnats förhållandevis lite intresse under senare år, blir belysta utifrån den numera omfattande internationella forskningen om den medeltida statsbildningsprocessen i Europa.

    Såväl danskt, norskt som svenskt lagmaterial ger uttryck för en påtaglig ökning av samhälleliga funktioner underställda en allt starkare kungamakt. Likväl framträder samtidigt betydande internordiska skillnader avseende såväl omfattningen av, som formerna för, den kungliga maktutövningen. Den lagreglerade kungamakten var, i de flesta avseenden, starkast och tidigast utvecklad i Norge och svagast och senast utvecklad i Sverige.

    Studien visar att den allt mer centraliserade och institutionaliserade kungliga maktutövningen, som präglades av en ökad ensamrätt till bruket av legitimt våld, kan betraktas som uttryck för en pågående statsbildningsprocess. Lagregleringen av rättslig makt framstår som avsevärt viktigare för denna utveckling än regleringen av militär eller fiskal makt. Ett annat viktigt resultat är att kunglig exekutiv makt först uppträdde efter etableringen av dömande, och i många avseenden även lagstiftande, kunglig makt.

  • 2016. Fredrik Charpentier Ljungqvist (et al.). Nature 532 (7597), 94-98

    Accurate modelling and prediction of the local to continental-scale hydroclimate response to global warming is essential given the strong impact of hydroclimate on ecosystem functioning, crop yields, water resources, and economic security. However, uncertainty in hydroclimate projections remains large, in part due to the short length of instrumental measurements available with which to assess climate models. Here we present a spatial reconstruction of hydroclimate variability over the past twelve centuries across the Northern Hemisphere derived from a network of 196 at least millennium-long proxy records. We use this reconstruction to place recent hydrological changes and future precipitation scenarios in a long-term context of spatially resolved and temporally persistent hydroclimate patterns. We find a larger percentage of land area with relatively wetter conditions in the ninth to eleventh and the twentieth centuries, whereas drier conditions are more widespread between the twelfth and nineteenth centuries. Our reconstruction reveals that prominent seesaw patterns of alternating moisture regimes observed in instrumental data across the Mediterranean, western USA, and China have operated consistently over the past twelve centuries. Using an updated compilation of 128 temperature proxy records, we assess the relationship between the reconstructed centennial-scale Northern Hemisphere hydroclimate and temperature variability. Even though dry and wet conditions occurred over extensive areas under both warm and cold climate regimes, a statistically significant co-variability of hydroclimate and temperature is evident for particular regions. We compare the reconstructed hydroclimate anomalies with coupled atmosphere-ocean general circulation model simulations and find reasonable agreement during pre-industrial times. However, the intensification of the twentieth-century-mean hydroclimate anomalies in the simulations, as compared to previous centuries, is not supported by our new multi-proxy reconstruction. This finding suggests that much work remains before we can model hydroclimate variability accurately, and highlights the importance of using palaeoclimate data to place recent and predicted hydroclimate changes in a millennium-long context.

  • 2016. Ulf Büntgen (et al.). Nature Geoscience 9 (3), 231-236

    Climatic changes during the first half of the Common Era have been suggested to play a role in societal reorganizations in Europe and Asia. In particular, the sixth century coincides with rising and falling civilizations, pandemics, human migration and political turmoil. Our understanding of the magnitude and spatial extent as well as the possible causes and concurrences of climate change during this period is, however, still limited. Here we use tree-ring chronologies from the Russian Altai and European Alps to reconstruct summer temperatures over the past two millennia. We find an unprecedented, long-lasting and spatially synchronized cooling following a cluster of large volcanic eruptions in 536, 540 and 547 AD, which was probably sustained by ocean and sea-ice feedbacks, as well as a solar minimum. We thus identify the interval from 536 to about 660 AD as the Late Antique Little Ice Age. Spanning most of the Northern Hemisphere, we suggest that this cold phase be considered as an additional environmental factor contributing to the establishment of the Justinian plague, transformation of the eastern Roman Empire and collapse of the Sasanian Empire, movements out of the Asian steppe and Arabian Peninsula, spread of Slavic-speaking peoples and political upheavals in China.

  • 2015. Fredrik Charpentier Ljungqvist.

    Medeltidshistorikern Fredrik Charpentier Ljungqvist bjuder på en lättläst exposé över den politiska, ekonomiska, sociala och kulturella utvecklingen i Norden under tusen år med utgångspunkt i de senaste rönen från arkeologisk och historisk forskning. Den långa medeltiden är en introduktion till Nordens historia från folkvandringstiden på 500-talet fram till reformationen på 1500-talet. Till skillnad från tidigare översiktsverk behandlas här hela Norden, och inte bara ett enskilt nordiskt land, och den traditionella uppdelningen mellan medeltid och forntid överges.

    Ett av kapitlen skildrar den politiska utvecklingen, men i övrigt står de sociala förhållandena i centrum i denna översikt. Hur bodde man och vad åt man? Vilka möjligheter fanns det att resa och hur utvecklades skeppsbyggnadskonsten? När skedde klimatförändringar och hur påverkade de människor? Vilka redskap användes i jordbruket, för hantverk och för att bygga hus och skepp? I vilken grad levde människor av självförsörjning och hur utvecklad var handeln? Hur såg lag och rätt ut?

    I boken behandlas allt från framväxten av nordiska kungariken och städer till jordbrukets och konsthantverkets utveckling och människors hälsa under forna tider. Vi får bekanta oss med livet för såväl kungar som trälar och följa med genom sociala omvälvningar som kristnandet, digerdöden och ståndssamhällets framväxt. Geografiskt rör vi oss från den karga nordnorska kusten i norr till den bördiga danska myllan i söder, med avstickare till Island och Grönland och med vikingafärder i öster- och västerled.

Show all publications by Fredrik Charpentier Ljungqvist at Stockholm University

Last updated: April 5, 2019

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