TUHAT-artikkelit / Articles from TUHAT CRIS


Kokoelma sisältää TUHAT-tutkimustietojäjestelmän kautta tallennetut Open Access-artikkelit.

Helsingin yliopiston tutkijat voivat rinnakkaistallentaa tutkimusjulkaisujansa HELDAan liittämällä kokotekstin julkaisuun TUHAT-tutkimustietojärjestelmässä. (Toimintaohje tutkijalle)

This collection contains Open Access articles deposited from the University of Helsinki TUHAT CRIS

Uusimmat julkaisut

  • Alipour, Mohammad Jaber; Jalanka, Jonna; Pessa-Morikawa, Tiina; Kokkonen, Tuomo; Satokari, Reetta; Hynönen, Ulla; Iivanainen, Antti; Niku, Mikael (2018)
    Recent research suggests that the microbial colonization of the mammalian intestine may begin before birth, but the observations are controversial due to challenges in the reliable sampling and analysis of low-abundance microbiota. We studied the perinatal microbiota of calves by sampling them immediately at birth and during the first postnatal week. The large size of the bovine newborns allows sampling directly from rectum using contamination-shielded swabs. Our 16S rDNA data, purged of potential contaminant sequences shared with negative controls, indicates the existence of a diverse low-abundance microbiota in the newborn rectal meconium and mucosa. The newborn rectal microbiota was composed of Firmicutes, Proteobacteria, Actinobacteria and Bacteroidetes. The microbial profile resembled dam oral rather than fecal or vaginal vestibular microbiota, but included typical intestinal taxa. During the first postnatal day, the rectum was invaded by Escherichia/Shigella and Clostridia, and the diversity collapsed. By 7 days, diversity was again increasing. In terms of relative abundance, Proteobacteria were replaced by Firmicutes, Bacteroidetes and Actinobacteria, including Faecalibacterium, Bacteroides, Lactobacillus, Butyricicoccus and Bifidobacterium. Our observations suggest that mammals are seeded before birth with a diverse microbiota, but the microbiota changes rapidly in the early postnatal life.
  • Mäkitie, Antti A.; Keski-Säntti, Harri; Markkanen-Leppänen, Mari; Bäck, Leif; Koivunen, Petri; Ekberg, Tomas; Sandström, Karl; Laurell, Göran; von Beckerath, Mathias; Nilsson, Johan S.; Wahlberg, Peter; Greiff, Lennart; Spaak, Lena Norberg; Kjaergaard, Thomas; Godballe, Christian; Rikardsen, Oddveig; Channir, Hani Ibrahim; Rubek, Niclas; von Buchwald, Christian (2018)
    Background: The five Nordic countries with a population of 27 M people form a rather homogenous region in terms of health care. The management of head and neck cancer is centralized to the 21 university hospitals in these countries. Our aim was to gain an overview of the volume and role of transoral robotic surgery (TORS) and to evaluate the need to centralize it in this area as the field is rapidly developing. Materials and Methods: A structured questionnaire was sent to all 10 Departments of Otorhinolaryngology-Head and Neck Surgery in the Nordic countries having an active programme for TORS in December 2017. Results: The total cumulative number of performed robotic surgeries at these 10 Nordic centers was 528 and varied between 5 and 240 per center. The median annual number of robotic surgeries was 38 (range, 5-60). The observed number of annually operated cases remained fairly low ( Conclusions: The present results showing a limited volume of performed surgeries call for considerations to further centralize TORS in the Nordic countries.
  • Mottus, Matti; Hernandez-Clemente, Rocio; Perheentupa, Viljami; Markiet, Vincent; Aalto, Juho; Bäck, Jaana; Nichol, Caroline J. (2018)
    The photochemical reflectance index (PRI) is calculated from vegetation narrowband reflectance in two bands in the visible part of the spectrum. Variations in PRI are associated with changes in the xanthophyll cycle pigments which regulate the light use efficiency of vegetation. Correlations have been found between remotely-sensed PRI and various photosynthetic productivity parameters at the scales from leaves to landscapes. Environmental satellites can provide only an instantaneous value of this index at the time of overpass. The diurnal course of needle (leaf) PRI needs to be known in order to link the instantaneous values robustly with photosynthetic parameters at time scales exceeding one day. This information is not currently available in the scientific literature. Here we present the daily cycle of Scots pine needle and canopy PRI in a southern boreal forest zone in the presence of direct solar radiation during the peak growing season of two consecutive years. We found the PRI of the needles which are exposed to direct radiation to have a distinct diurnal cycle with constant or slightly increasing values before noon and a daily minimum in the afternoon. The cycle in needle PRI was not correlated with that in the incident photosynthetic photon flux density (PPFD). However, when PPFD was above 1000 mol m(-2) s(-1), approximately between 8 a.m. and 5 p.m., needle PRI was correlated with the light use efficiency (LUE), measured with shoot chambers. The timing of the minimum needle PRI coincided with the minimum canopy value, as measured by an independent sensor above the canopy, but the correlation between the two variables was not significant. Our field results corroborate the applicability of needle PRI in monitoring the daily variation in LUE. However, to apply this to remote sensing of seasonal photosynthetic productivity, the daily cycle of leaf PRI needs to be known for the specific vegetation type.
  • Solly, Emily F.; Brunner, Ivano; Helmisaari, Heljä-Sisko Marketta; Herzog, Claude; Leppälammi-Kujansuu, Jaana; Schöning, Ingo; Schrumpf, Marion; Schweingruber, Fritz H; Trumbore, Susan E.; Hagedorn, Frank (2018)
    Fine roots support the water and nutrient demands of plants and supply carbon to soils. Quantifying turnover times of fine roots is crucial for modeling soil organic matter dynamics and constraining carbon cycle–climate feedbacks. Here we challenge widely used isotopebased estimates suggesting the turnover of fine roots of trees to be as slow as a decade. By recording annual growth rings of roots from woody plant species, we show that mean chronological ages of fine roots vary from <1 to 12 years in temperate, boreal and sub-arctic forests. Radiocarbon dating reveals the same roots to be constructed from 10 ± 1 year (mean ± 1 SE) older carbon. This dramatic difference provides evidence for a time lag between plant carbon assimilation and production of fine roots, most likely due to internal carbon storage. The high root turnover documented here implies greater carbon inputs into soils than previously thought which has wide-ranging implications for quantifying ecosystem carbon allocation.
  • Johnson, Katherine; Bertoli, Marta; Phillips, Lauren; Topf, Ana; Van den Bergh, Peter; Vissing, John; Witting, Nanna; Nafissi, Shahriar; Jamal-Omidi, Shirin; Lusakowska, Anna; Kostera-Pruszczyk, Anna; Potulska-Chromik, Anna; Deconinck, Nicolas; Wallgren-Pettersson, Carina; Strang-Karlsson, Sonja; Colomer, Jaume; Claeys, Kristl G.; De Ridder, Willem; Baets, Jonathan; von der Hagen, Maja; Fernandez-Torron, Roberto; Zulaica Ijurco, Miren; Espinal Valencia, Juan Bautista; Hahn, Andreas; Durmus, Hacer; Willis, Tracey; Xu, Liwen; Valkanas, Elise; Mullen, Thomas E.; Lek, Monkol; MacArthur, Daniel G.; Straub, Volker (2018)
    Background: Dystroglycanopathies are a clinically and genetically heterogeneous group of disorders that are typically characterised by limb-girdle muscle weakness. Mutations in 18 different genes have been associated with dystroglycanopathies, the encoded proteins of which typically modulate the binding of alpha-dystroglycan to extracellular matrix ligands by altering its glycosylation. This results in a disruption of the structural integrity of the myocyte, ultimately leading to muscle degeneration. Methods: Deep phenotypic information was gathered using the PhenoTips online software for 1001 patients with unexplained limb-girdle muscle weakness from 43 different centres across 21 European and Middle Eastern countries. Whole-exome sequencing with at least 250 ng DNA was completed using an Illumina exome capture and a 38 Mb baited target. Genes known to be associated with dystroglycanopathies were analysed for disease-causing variants. Results: Suspected pathogenic variants were detected in DPM3, ISPD, POMT1 and FKTN in one patient each, in POMK in two patients, in GMPPB in three patients, in FKRP in eight patients and in POMT2 in ten patients. This indicated a frequency of 2.7% for the disease group within the cohort of 1001 patients with unexplained limb-girdle muscle weakness. The phenotypes of the 27 patients were highly variable, yet with a fundamental presentation of proximal muscle weakness and elevated serum creatine kinase. Conclusions: Overall, we have identified 27 patients with suspected pathogenic variants in dystroglycanopathy-associated genes. We present evidence for the genetic and phenotypic diversity of the dystroglycanopathies as a disease group, while also highlighting the advantage of incorporating next-generation sequencing into the diagnostic pathway of rare diseases.
  • Duplouy, Anne; Hornett, Emily A. (2018)
    The Lepidoptera is one of the most widespread and recognisable insect orders. Due to their remarkable diversity, economic and ecological importance, moths and butterflies have been studied extensively over the last 200 years. More recently, the relationship between Lepidoptera and their heritable microbial endosymbionts has received increasing attention. Heritable endosymbionts reside within the host’s body and are often, but not exclusively, inherited through the female line. Advancements in molecular genetics have revealed that host-associated microbes are both extremely prevalent among arthropods and highly diverse. Furthermore, heritable endosymbionts have been repeatedly demonstrated to play an integral role in many aspects of host biology, particularly host reproduction. Here, we review the major findings of research of heritable microbial endosymbionts of butterflies and moths. We promote the Lepidoptera as important models in the study of reproductive manipulations employed by heritable endosymbionts, with the mechanisms underlying male-killing and feminisation currently being elucidated in both moths and butterflies. We also reveal that the vast majority of research undertaken of Lepidopteran endosymbionts concerns Wolbachia. While this highly prevalent bacteria is undoubtedly important, studies should move towards investigating the presence of other, and interacting endosymbionts, and we discuss the merits of examining the microbiome of Lepidoptera to this end. We finally consider the importance of understanding the influence of endosymbionts under global environmental change and when planning conservation management of endangered Lepidoptera species.
  • Drake, Thomas M.; Camilleri-Brennan, Julian; Tabiri, Stephen; Fergusson, Stuart J.; Spence, Richard; Fitzgerald, J. Edward F.; Bhangu, Aneel; Harrison, Ewen M.; Ademuyiwa, Adesoji O.; Fergusson, Stuart; Glasbey, James C.; Khatri, Chetan; Mohan, Midhun; Nepogodiev, Dmitri; Soreide, Kjetil; Gobin, Neel; Freitas, Ana Vega; Hall, Nigel; Kim, Sung-Hee; Negida, Ahmed; Jaffry, Zahra; Chapman, Stephen J.; Arnaud, Alexis P.; Recinos, Gustavo; Manipal, Cutting Edge; Amandito, Radhian; Shawki, Marwan; Hanrahan, Michael; Pata, Francesco; Zilinskas, Justas; Roslani, April Camilla; Goh, Cheng Chun; Irwin, Gareth; Shu, Sebastian; Luque, Laura; Shiwani, Hunain; Altamimi, Afnan; Alsaggaf, Mohammed Ubaid; Rayne, Sarah; Jeyakumar, Jenifa; Cengiz, Yucel; Raptis, Dmitri A.; Fermani, Claudio; Balmaceda, Ruben; Marta Modolo, Maria; Macdermid, Ewan; Chenn, Roxanne; Yong, Cheryl Ou; Mentula, Panu; Leppäniemi, Ari; Sallinen, Ville (2018)
    Background Appendicitis is the most common abdominal surgical emergency worldwide. Differences between high- and low-income settings in the availability of laparoscopic appendectomy, alternative management choices, and outcomes are poorly described. The aim was to identify variation in surgical management and outcomes of appendicitis within low-, middle-, and high-Human Development Index (HDI) countries worldwide. Methods This is a multicenter, international prospective cohort study. Consecutive sampling of patients undergoing emergency appendectomy over 6 months was conducted. Follow-up lasted 30 days. Results 4546 patients from 52 countries underwent appendectomy (2499 high-, 1540 middle-, and 507 low-HDI groups). Surgical site infection (SSI) rates were higher in low-HDI (OR 2.57, 95% CI 1.33-4.99, p = 0.005) but not middle-HDI countries (OR 1.38, 95% CI 0.76-2.52, p = 0.291), compared with high-HDI countries after adjustment. A laparoscopic approach was common in high-HDI countries (1693/2499, 67.7%), but infrequent in low-HDI (41/507, 8.1%) and middle-HDI (132/1540, 8.6%) groups. After accounting for case-mix, laparoscopy was still associated with fewer overall complications (OR 0.55, 95% CI 0.42-0.71, p <0.001) and SSIs (OR 0.22, 95% CI 0.14-0.33, p <0.001). In propensity-score matched groups within low-/middle-HDI countries, laparoscopy was still associated with fewer overall complications (OR 0.23 95% CI 0.11-0.44) and SSI (OR 0.21 95% CI 0.09-0.45). Conclusion A laparoscopic approach is associated with better outcomes and availability appears to differ by country HDI. Despite the profound clinical, operational, and financial barriers to its widespread introduction, laparoscopy could significantly improve outcomes for patients in low-resource environments. Trial registration: NCT02179112.
  • Colecchia, D; Stasi, M; Leonardi, M; Manganelli, F; Nolano, M; Veneziani, BM; Santoro, L; Eskelinen, Eeva-Liisa; Chiariello, M; Bucci, Cecilia (2018)
    Charcot-Marie-Tooth type 2B (CMT2B) disease is a dominant axonal peripheral neuropathy caused by 5 mutations in the RAB7A gene, a ubiquitously expressed GTPase controlling late endocytic trafficking. In neurons, RAB7A also controls neuronal-specific processes such as NTF (neurotrophin) trafficking and signaling, neurite outgrowth and neuronal migration. Given the involvement of macroautophagy/autophagy in several neurodegenerative diseases and considering that RAB7A is fundamental for autophagosome maturation, we investigated whether CMT2B-causing mutants affect the ability of this gene to regulate autophagy. In HeLa cells, we observed a reduced localization of all CMT2B-causing RAB7A mutants on autophagic compartments. Furthermore, compared to expression of RAB7AWT, expression of these mutants caused a reduced autophagic flux, similar to what happens in cells expressing the dominant negative RAB7AT22N mutant. Consistently, both basal and starvation-induced autophagy were strongly inhibited in skin fibroblasts from a CMT2B patient carrying the RAB7AV162M mutation, suggesting that alteration of the autophagic flux could be responsible for neurodegeneration.
  • Pascall, JC; Webb, LMC; Eskelinen, Eeva-Liisa; Innocentin, S; Attaf-Bouabdallah, N; Butcher, GW (2018)
  • Savola, Paula; Lundgren, Sofie; Keränen, Mikko A. I.; Almusa, Henrikki; Ellonen, Pekka; Leirisalo-Repo, Marjatta; Kelkka, Tiina; Mustjoki, Satu (2018)
  • Hlushchenko, Iryna; Khanal, Pushpa; Abouelezz, Amr; Paavilainen, Ville O.; Hotulainen, Pirta (2018)
    Many actin cytoskeleton-regulating proteins control dendritic spine morphology and density, which are cellular features often altered in autism spectrum disorder (ASD). Recent studies using animal models show that autism-related behavior can be rescued by either manipulating actin regulators or by reversing dendritic spine density or morphology. Based on these studies, the actin cytoskeleton is a potential target pathway for developing new ASD treatments. Thus, it is important to understand how different ASD-associated actin regulators contribute to the regulation of dendritic spines and how ASD-associated mutations modulate this regulation. For this study, we selected five genes encoding different actin-regulating proteins and induced ASD-associated de novo missense mutations in these proteins. We assessed the functionality of the wild-type and mutated proteins by analyzing their subcellular localization, and by analyzing the dendritic spine phenotypes induced by the expression of these proteins. As the imbalance between excitation and inhibition has been suggested to have a central role in ASD, we additionally evaluated the density, size and subcellular localization of inhibitory synapses. Common for all the proteins studied was the enrichment in dendritic spines. ASD-associated mutations induced changes in the localization of alpha-actinin-4, which localized less to dendritic spines, and for SWAP-70 and SrGAP3, which localized more to dendritic spines. Among the wild-type proteins studied, only alpha-actinin-4 expression caused a significant change in dendritic spine morphology by increasing the mushroom spine density and decreasing thin spine density. We hypothesized that mutations associated with ASD shift dendritic spine morphology from mushroom to thin spines. An M554V mutation in alpha-actinin-4 (ACTN4) resulted in the expected shift in dendritic spine morphology by increasing the density of thin spines. In addition, we observed a trend toward higher thin spine density withmutations inmyosin IXb and SWAP-70. Myosin IIb and myosin IXb expression increased the proportion of inhibitory synapses in spines. The expression of mutated myosin IIb (Y265C), SrGAP3 (E469K), and SWAP-70 (L544F) induced variable changes in inhibitory synapses.
  • Väyrynen, Sai; Hietanen, Lenita (2018)
    While several studies focus on university students’ participation in their educational paths, fewer studies deal with students’ participation in the processes of curriculum design and implementation. This qualitative case study explores how more equal practices can be implemented at universities, using the Framework for Participation (Black-Hawkins, 2010) and the case of music studies in primary teacher education. Inclusion, participation and culturally relevant curricula are keys to promote sustainable social development. This is particularly important in the sparsely populated northern areas, and we need develop ways in which we can engage our student teachers in this exploration. The first part of the data was collected and analysed in the spring semester 2013 focusing on the ways in which the students were involved in the different phases of the curriculum: enacted and experienced curriculum. Based on the findings of the first part, during the curriculum renewal period, and after participating in developing a music course curriculum, the second data were collected in the autumn semester 2017. Our findings indicate that students’ experiences of participation vary, for example, according to their opportunities to use, challenge and develop their musical skills in action.
  • Mozumder, Mohammad Mojibul Hoque; Shamsuzzaman, Md Mostafa; Rashed-Un-Nabi, Md.; Karim, Ehsanul (2018)
    The Sundarban Mangrove Forest (SMF) is an intricate ecosystem containing the most varied and profuse natural resources of Bangladesh. This study presents empirical research, based on primary and secondary data, regarding the social-ecological system (SES), social-ecological dynamics, different stakeholders and relevant management policies of small-scale or artisanal fisheries such as the SMF; showing how, despite extensive diversification, the livelihood activities of the artisanal fishers in the SMF all depend on the forest itself. Regardless of this critical importance of mangroves, however, deforestation continues due to immature death of mangroves, illegal logging, increased salinity, natural disasters and significant household consumption of mangrove wood by local people. As the mangroves are destroyed fish stocks, and other fishery resources are reduced, leading to moves of desperation among those whose livelihood has traditionally been fishing. The present study also considers several risks and shock factors in the fishers' livelihood: attacks by wild animals (especially tigers) and local bandits, illness, natural disasters, river bank erosion, and the cost of paying off corrupt officials. The artisanal fishers of the SMF have adopted different strategies for coping with these problems: developing partnerships, violating the fisheries management laws and regulations, migrating, placing greater responsibility on women, and bartering fishing knowledge and information. This study shows how the social component (human), the ecological component (mangrove resources) and the inter-phase aspects (local ecological knowledge, stakeholder's interest, and money lenders or middle man roles) of the SMF as an SES are linked in mutual interaction. It furthermore considers how the social-ecological dynamics of the SMF have negative impacts on artisanal fishermen's livelihoods. Hence there is an urgency to update existing policies and management issues for the sustainable utilization of the SMF resources, eventually contributing to theimprovement of the artisanal fishers' livelihoods.
  • Mozumder, Mohammad Mojibul Hoque; Shamsuzzaman, Md. Mostafa; Rashed-Un-Nabi, Md.; Harun-Al-Rashid, Ahmed (2018)
    The Sundarbans Mangrove Forest (SMF) is a complex ecosystem containing the most diverse and abundant natural resources of Bangladesh. The research was designed to investigate the socio-economic characteristics and fishing operation activities of the artisanal fishers in the SMF through case studies. Despite the great importance of mangroves in the livelihood of the artisanal fishermen in the SMF, deforestation is perceived to continue due to illegal logging and deterioration of mangroves for climate change, increased salinity, natural disasters, shrimp farming and household consumption. The consequences are depleted fish and fishery resources, changes in fisher's primary occupation and livelihood status. The present study also elicited several risks and shocks of the fishermen livelihood like the attack by dacoits, hostage, ransom, and attack by tigers, natural disasters, river bank erosion. However, the artisanal fishermen adopted different strategies to cope with the changing conditions by forming associations, violating the fisheries laws and regulations, migrating, sharing responsibilities with the household members, and transmitting local ecological knowledge. This study concludes that there is an urgency to update the existing policies and management issues for the sustainable extraction of the SMF resources for the improvement of the artisanal fishermen livelihood.
  • Laine, Anu; Ahtee, Maija; Näveri, Liisa; Pehkonen, Erkki; Hannula, Markku S. (2018)
    The aim of this study is to find out whether there is a connection between teacher’s request and guidance for written explanation and third-graders’ achievements in solving a non-standard problem. Pupils’ task was to solve a simplified arithmagon and to explain their solution. The lessons of seven teachers were recorded and their actions were examined and categorized during a problem-solving lesson. Also pupils’ solutions were checked and classified. The teacher’s behavior seems to have a crucial role in the quality of pupils’ written explanations. The third-graders had difficulties in writing their reasoning for solving the problem.
  • Kajamaa, Anu; Schulz, Klaus-Peter (2018)
    Background: The implementation of innovations in practice is a critical factor for change and development processes in health and home care. We therefore analyze how an innovative tool - a mobility agreement to maintain physical mobility of home care clients - was implemented in Finnish home care. Methods: Our study involves ethnographic research of 13 home care visits, two years after the mobility agreement was implemented. We analyze the emergence of contradictions, the motives of the actors and the use of artifacts supporting or inhibiting the implementation. Two in-depth cases illustrate the implementation of the mobility agreement in home care visits. Findings: Our findings show that, first, to achieve practice change and development, the innovation implementation requires the overcoming of contradictions in the implementation process. Second, it calls for the emergence of a shared motive between the actors to transform the abstract concept of an innovation into a concrete practice. Third, artifacts, customary to the clients are important in supporting the implementation process. Fourth, the implementation brings about a modification of the innovation and the adopting social system. Conclusions: Innovation implementation should be seen as a transformation process of an abstract concept into a concrete practice, enabled by the actors involved. Concept design and implementation should be closely linked. In health/home care innovation management, the implementation of innovations needs to be understood as a complex collective learning process. Results can be far reaching - in our case leading to change of home care workers' professional understanding and elderly clients' mobility habits.
  • Sepp, Anu; Hietanen, Lenita; Enbuska, Jukka; Tuisku, Vesa; Ruokonen, Inkeri; Ruismäki, Heikki (2018)
    In Finland, music subject is part of National Core Curriculum and in the primary school stage (grades 1-6) usually taught by primary school teachers. To assure instruction of music education on a highly professional level, pre-service teachers are taught piano course as part of music didactics. This article reports findings of the pilot study carried out as part of ArcTop research project between University of Lapland and University of Helsinki to develop and improve primary school teacher education in both institutions. Students' expectations and reflections are examined through the lens of self-efficacy theory by Bandura (1977, 1986, 1997). The data were collected using an open-ended questionnaire to find out students experiences in piano playing and music reading as well as their self-reflections about the learning process. The answers (n = 97) were processed statistically and analysed using qualitative content analysis. The results revealed that most of the participants (n = 64) were inexperienced in piano playing. At the same time they were highly motivated and eager to learn and practice. The students also mentioned the lack of elementary music literacy knowledge and the insufficient number of contact lessons which give grounds for making further arrangements in the curriculum.
  • Laine, Heidi; Nykyri, Susanna Kirsi (2018)
    Opetus- ja kulttuuriministeriön Avoin tiede ja tutkimus (ATT) -hanke tilasi keväällä 2017 Data-asiain kansalliskomitealta selvityksen tutkimusdataan viittaamisesta. Selvityksen tuloksena julkaistiin huhtikuussa 2018 dataviittaustiekartta suomalaiselle tiedeyhteisölle. Tiekartan tavoitteena on yhdenmukaistaa tutkimusdataan viittaamisen käytäntöjä, parantaa tutkimusdatan viittattavuutta sekä lisätä viittausmääriä. Tampereen teknillisen yliopiston kirjasto, Data-asiain kansalliskomitea ja Suomen yliopistojen rehtorineuvosto UNIFI ry järjestivät 18.5. Tampereella seminaarin Tutkimusdataan viittaaminen: tiekartasta käytäntöön -keskustelutilaisuuden dataviittaustiekartan toimeenpanosta. Tässä kirjoituksessa käymme läpi tutkimusdataan viittaamisen periaatteita ja käytäntöjä tiekartan ja keskustelutilaisuuden pohjalta. Tavoitteenamme on tehdä aihepiiriä tutuksi ja ymmärrettäväksi erityisesti tutkijoille.
  • Salonen, J. Sakari; Helmens, Karin F.; Brendryen, Jo; Kuosmanen, Niina; Väliranta, Minna; Goring, Simon; Korpela, Mikko; Kylander, Malin; Philip, Annemarie; Plikk, Anna; Renssen, Hans; Luoto, Miska (2018)
    The Eemian (the Last Interglacial; ca. 129-116 thousand years ago) presents a testbed for assessing environmental responses and climate feedbacks under warmer-than-present boundary conditions. However, climate syntheses for the Eemian remain hampered by lack of data from the high-latitude land areas, masking the climate response and feedbacks in the Arctic. Here we present a high-resolution (sub-centennial) record of Eemian palaeoclimate from northern Finland, with multi-model reconstructions for July and January air temperature. In contrast with the mid-latitudes of Europe, our data show decoupled seasonal trends with falling July and rising January temperatures over the Eemian, due to orbital and oceanic forcings. This leads to an oceanic Late-Eemian climate, consistent with an earlier hypothesis of glacial inception in Europe. The interglacial is further intersected by two strong cooling and drying events. These abrupt events parallel shifts in marine proxy data, linked to disturbances in the North Atlantic oceanic circulation regime.
  • Carragher, Neil; Piccinini, Filippo; Tesei, Anna; Trask, O. Joseph; Bickle, Marc; Horvath, Peter (2018)

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