Search results for "EarthArXiv|Physical Sciences and Mathematics|Earth Sciences"
showing 10 items of 2291 documents
Climate and extreme rainfall events in the Mono river basin (West Africa): investigating future changes with Regional Climate Models.
2020
This study characterizes the future changes in extreme rainfall and air temperature in the Mono river basin where the main economic activity is weather dependent and local populations are highly vulnerable to natural hazards, including flood inundations. Daily precipitation and temperature from observational datasets and Regional Climate Models (RCMs) output from REMO, RegCM, HadRM3, and RCA were used to analyze climatic variations in space and time, and fit a GEV model to investigate the extreme rainfalls and their return periods. The results indicate that the realism of the simulated climate in this domain is mainly controlled by the choice of the RCMs. These RCMs projected a 1 to 1.5 °
Bacterial and phytoplankton responses to nutrient amendments in a boreal lake differ according to season and to taxonomic resolution
2011
Nutrient limitation and resource competition in bacterial and phytoplankton communities may appear different when considering different levels of taxonomic resolution. Nutrient amendment experiments conducted in a boreal lake on three occasions during one open water season revealed complex responses in overall bacterioplankton and phytoplankton abundance and biovolume. In general, bacteria were dominant in spring, while phytoplankton was clearly the predominant group in autumn. Seasonal differences in the community composition of bacteria and phytoplankton were mainly related to changes in observed taxa, while the differences across nutrient treatments within an experiment were due to chang…
Impact of the terrestrial reference frame on the determination of the celestial reference frame.
2022
Currently three up-to-date Terrestrial Reference Frames (TRF) are available, the ITRF2014 from IGN, the DTRF2014 from DGFI-TUM, and JTRF2014 from JPL. All use the identical input data of space-geodetic station positions and Earth orientation parameters, but the concept of combining these data is fundamentally different. The IGN approach is based on the combination of technique solutions, while the DGFI is combining the normal equation systems. Both yield in reference epoch coordinates and velocities for a global set of stations. JPL uses a Kalman filter approach, realizing a TRF through weekly time series of geocentric coordinates. As the determination of the CRF is not independent of the T…
Ice jams in Daugava (17.04.1904.)
1904
Foto 1: Eisberg am Südende der Insel Dahlenholm aus Dünaufer vom linken Dünaufer ausgesehen. Aisbergs Doles salas dienvidgalā, skatot no Daugavas kreisā krasta. Foto 2: Eiswahl am südufer der Insel Dahlen mit emporgehobene Kiesschutt. Blick stromaufwarts von halben Hohe des Uferhanges. Ledus siena Dahlenas salas dienvidu krastā ar paceltām grants atlūzām. Skats augšpus no krasta nogāzes pusaugstuma. (LU Muzeja Botānikas un mikoloģijas kolekcija M1613/288.)
Ice jams in Daugava
1904
K. R. Kupfera 1904. gada 17. aprīlī fotografētie ledus sastrēgumi Daugavā pie Salaspils un Doles salas ar autora aprakstu. K. R. Kupfer's photographed ice jams in Daugava near Salaspils and Dole Island on 17 April 1904, with a autor's description. K. R. Kupfer fotografierte am 17. April 1904 Eisstauungen in der Daugava bei Salaspils und Dole Island mit einer Beschreibung vom Autor. (LU Muzeja Botānikas un mikoloģijas kolekcija M1613/288)
Ledus Daugavā 1904. un 1905. gada aprīlī
2020
Aprīļa mēneša laikapstākļi Latvijā mēdz būt ļoti atšķirīgi, bet nereti šajā laikā uz upēm veidojas ledus sastrēgumi. Latvijas Universitātes Muzeja Botānikas un mikoloģijas kolekcijās glabājas dabaspētnieka Karla Reinholda Kupfera (Karl Reinhold Kupffer, 1872–1935) fotoliecības par ledus sastrēgumiem uz Daugavas 1904. un 1905. gados.
Carbon Budget and Molecular Structure of Natural Organic Matter in Bank Infiltrated Groundwater
2021
Groundwater : : journal of the Association of Ground-Water Scientists and Engineers, a division of the National Ground Water Association (2021). doi:10.1111/gwat.13087
Évolution des précipitations extrêmes dans le bassin versant du Mono (Bénin-Togo) en contexte de variabilité / changement climatique.
2014
International audience; Dans le golfe de Guinée et dans le bassin du Mono, au Bénin-Togo, en particulier, la population est de plus enplus exposée aux événements de précipitations extrêmes ou à l’intensité de ces événements causant des inondations de plusen plus récurrentes dans un environnement où on assiste à une croissance démographique galopante. L’objectif de cetteétude est : 1) d’analyser l’évolution des précipitations extrêmes dans le bassin au cours de la période 1988-2010 à partir dedonnées pluviométriques krigées ; 2) d’effectuer une comparaison avec les simulations régionales à 50 km de résolutionproduites par les modèles MPI, ICT, SMH et METO dans le cadre du projet Européen ENS…
STOP 12: Late-glacial and Holocene development of Lake Rāzna as recorded by biostratigraphy
2014
Synsedimentary collapse on a carbonate platform margin (lower Barremian, southern Vercors, SE France)
2004
International audience; A large area of synsedimentary collapse covering about 25 km2 has been identified within Lower Barremian carbonate platform strata of the Southern Vercors (Vocontian Basin, SE France). New observations of the prograding/aggrading strata of the Cirque d'Archiane and the Glandasse Plateau reveal the presence of a disturbed zone, showing tilted and imbricated blocks as well as slump features. Measurements and analysis on these synsedimentary distorted strata suggest that they compose a slide which slipped on the Barremian slope. The occurence of two coarse bioclastic grainstone beds on the eastern side of the Archiane Valley, in a distal hemipelagic context, suggests th…