Browsing Faculty of Mathematics and Natural Sciences by Title
Now showing items 6621-6640 of 9860
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p-Kernel Stein Variational Gradient Descent for Data Assimilation and History Matching
(Journal article; Peer reviewed, 2021)A Bayesian method of inference known as “Stein variational gradient descent” was recently implemented for data assimilation problems, under the heading of “mapping particle filter”. In this manuscript, the algorithm is ... -
P3 problem and Magnolia language: Specializing array computations for emerging architectures
(Journal article; Peer reviewed, 2022)The problem of producing portable high-performance computing (HPC) software that is cheap to develop and maintain is called the P3 (performance, portability, productivity) problem. Good solutions to the P3 problem have ... -
Pacific and Atlantic Lepeophtheirus salmonis (Krøyer, 1838) are allopatric subspecies: Lepeophtheirus salmonis salmonis and L. salmonis oncorhynchi subspecies novo
(Peer reviewed; Journal article, 2014-03-14)Background: The salmon louse Lepeophtheirus salmonis is a parasitic copepod that infects salmonids in the Pacific and Atlantic oceans. Although considered as a single species, morphological and biological differences have ... -
Pacific circulation response to eastern Arctic sea ice reduction in seasonal forecast simulations
(Journal article; Peer reviewed, 2021)Recent studies point to the sensitivity of mid-latitude winter climate to Arctic sea ice variability. However, there remain contradictory results in terms of character and timing of Northern Hemisphere large-scale circulation ... -
Pacific contribution to decadal surface temperature trends in the Arctic during the twentieth century
(Journal article; Peer reviewed, 2021)Instrumental records suggest multidecadal variability in Arctic surface temperature throughout the twentieth century. This variability is caused by a combination of external forcing and internal variability, but their ... -
Pacific contribution to the early twentieth-century warming in the Arctic
(Journal article; Peer reviewed, 2018)Arctic surface temperature warmed more than twice as fast as global temperature during the early twentieth century, similar to that during the recent global warming. This Arctic warming has been attributed to both external ... -
Pacific oceanic front amplifies the impact of Atlantic oceanic front on North Atlantic blocking
(Journal article; Peer reviewed, 2023)Atmospheric blocking is a crucial driver of extreme weather events, but its climatological frequency is largely underestimated in state-of-the-art climate models, especially around the North Atlantic. While air-sea interaction ... -
Packing arc-disjoint cycles in tournaments
(Journal article; Peer reviewed, 2019)A tournament is a directed graph in which there is a single arc between every pair of distinct vertices. Given a tournament T on n vertices, we explore the classical and parameterized complexity of the problems of determining ... -
Packing cycles faster than Erdos-Posa
(Journal article; Peer reviewed, 2019)The Cycle Packing problem asks whether a given undirected graph $G=(V,E)$ contains $k$ vertex-disjoint cycles. Since the publication of the classic Erdös--Pósa theorem in 1965, this problem received significant attention ... -
PaCTS 1.0: a crowdsourced reporting standard for paleoclimate data
(Journal article; Peer reviewed, 2019-09)The progress of science is tied to the standardization of measurements, instruments, and data. This is especially true in the Big Data age, where analyzing large data volumes critically hinges on the data being standardized. ... -
Pairwise local Fisher and naive Bayes: Improving two standard discriminants
(Journal article; Peer reviewed, 2020)The Fisher discriminant is probably the best known likelihood discriminant for continuous data. Another benchmark discriminant is the naive Bayes, which is based on marginals only. In this paper we extend both discriminants ... -
Palaeo-productivity record from Norwegian Sea enables North Atlantic Oscillation (NAO) reconstruction for the last 8000 years
(Journal article; Peer reviewed, 2020)The North Atlantic Oscillation is the dominant atmospheric driver of North Atlantic climate variability with phases corresponding to droughts and cold spells in Europe. Here, we exploit a suggested anti-correlation of North ... -
Palaeolimnological and sedimentary responses to Holocene forest retreat in the Scandes Mountains, west-central Sweden
(Peer reviewed; Journal article, 2004)A suite of analyses was performed on sediments accumulated during the last 10 700 years in Lake Spaime, a small, hydrologically open water body in the modem alpine tundra zone of the Scandes Mountains, west-central Sweden. ... -
Palaeolimnological responses of nine North African lakes in the CASSARINA Project to recent environmental changes and human impact detected by plant macrofossil, pollen, and faunal analyses
(Peer reviewed; Journal article, 2001)This paper presents multi-proxy palaeolimnological analyses from recent sediments in the nine CASSARINA lakes in northernmost Africa, three from each of Morocco, Tunisia, and Egypt. The lakes are diverse, ranging from ... -
Palaeovegetation and environment during Weichselian stadials and interstadials at Mamontovaya Kurja and Sokolova in the Pechora basin, northern Russia
(Master thesis, 2000)The vegetation and climate history of the Pechora area of northwestern Russia during the Early- and Mid Weichselian have been studied. Sediments from two sites have been analysed in this study; from Sokolova and Mamontovaya ... -
Paleoceanographic reconstructions across the Plio-Pleistocene from clumped isotope thermometry
(Doctoral thesis, 2023-12-06)Bruk av isotopklyngetermometri (Δ47) på foraminiferer er en relativt ny tilnærming for å estimere havtemperaturer tilbake i tid. I motsetning til mange andre paleotermometre gir denne metoden temperaturer som er upåvirket ... -
Paleoceanography and paleoclimate in the Nordic Seas and the northern North Atlantic during the last 22 000 years
(Doctoral thesis, 2006-09-01)The paleoceanography of the Nordic Seas and the northern North Atlantic during glacial and deglacial times was studied, using oxygen isotopes and Mg/Ca of foraminifera. The specific objectives are listed below: 1) Sea ... -
Paleoclimate changes inferred from stable isotopes and magnetic properties of organic-rich lake sediments in Arctic Norway
(Peer reviewed; Journal article, 2011-03-22)Stable isotope measures in organic matter are frequently used as indicators of past climate change. Although such analyses can provide valuable information, there is considerable uncertainty associated with studies of ... -
A paleoecological context to assess the development of oak forest in Colombia: A comment on Zorilla-Azcué, S., Gonzalez-Rodríguez, A., Oyama, K., González, M.A., & Rodríguez-Correa, H., The DNA history of a lonely oak: Quercus humboldtii phylogeography in the Colombian Andes. Ecology and Evolution 2021, doi: 10.100-2/ ece3.7529
(Journal article; Peer reviewed, 2022)The present “comment” on Zorilla-Azcué et al.’s paper “The DNA history of a lonely oak: Quercus humboldtii phylogeography in the Colombian Andes. Ecology and Evolution 2021, doi:10.100-2/ece3.7529” provides the paleoecological ... -
Paleoenvironmental and diagenetic evolution of the Aptian Pre-Salt succession in Namibe Basin (Onshore Angola)
(Journal article; Peer reviewed, 2023)The Aptian Pre-Salt sedimentary succession cropping out in Cangulo palaeovalley onshore Namibe Basin (Angola) was studied by a combination of field and analytical techniques to constrain the sedimentary and diagenetic ...