Sökning: "real-time assimilation"

Hittade 5 avhandlingar innehållade orden real-time assimilation.

  1. 1. Space-Time Prediction of Ocean Winds

    Författare :Anders Malmberg; Matematisk statistik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Statistics; operations research; image warping; thin-plate splines.; near-surface ocean winds; variogram parameters; Space-time Kalman filtering; real-time assimilation; residual wind speed; actuarial mathematics; programming; Statistik; operationsanalys; programmering; aktuariematematik;

    Sammanfattning : The topic of this thesis is inspired by an experiment in which a vessel, laying a submarine cable, was provided with forecasts overlaid with satellite observations of significant wave height. During the operation, the vessel was close to an adverse weather area and the personnel on board could confirm that the forecast was not as close to the "ground truth" as the satellite observation was. LÄS MER

  3. 2. A Variational data assimilation scheme and its use of meteorological observations

    Författare :Erik Andersson; Lennart Bengtsson; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; meteorologi; Meteorology;

    Sammanfattning : Meteorological data assimilation is the process by which a model simulation of the atmosphere is corrected by observations. In operational weather forecasting, this is done in near real-time, to provide accurate initial conditions for numerical forecasts. The accuracy of the forecasts depends crucially on the accuracy of the data assimilation. LÄS MER

  4. 3. Measuring Water Droplets to Detect Atmospheric Icing

    Författare :Staffan Rydblom; Benny Thörnberg; Mattias O'Nils; Anssi Mäkynen; Mittuniversitetet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : This thesis describes the exploration of a method to measurethe droplet size and the concentration of atmospheric liquid water. The purpose is to find a cost effective technique to detect the conditions for icing on structures. LÄS MER

  5. 4. Monitoring the cellular phosphate status in bloom-forming cyanobacteria of the Baltic Sea

    Författare :Sara Jonasson; Erik Söderbäck; Hans C. P. Matthjis; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cyanobacteria; Baltic Sea; phosphorus; cyanotoxin; nodularin; Plant physiology; Växtfysiologi;

    Sammanfattning : In the Baltic Sea dense cyanobacterial blooms occur regularly during late summer. Since the dominant bloom-forming cyanobacteria, Nodularia spp. and Apanizomenon spp. are capable of fixing atmospheric dinitrogen, the macronutrient predominantly limiting their growth is phosphorus. LÄS MER

  7. 5. Development and Test of an Imaging Instrument for Measurement of Water Droplets in Icing Conditions

    Författare :Stefani Alita Leona Rydblom; Benny Thörnberg; Aimé Lay-Ekuakille; Mittuniversitetet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Icing measurements; field study; shadowgraph imaging; edge detection; LWC; MVD.;

    Sammanfattning : Structural icing is a persistent challenge for the production of renewable energy from wind. It is mainly caused by supercooled atmospheric droplets of water, which are very common in cold climates. In the most exposed wind parks in Sweden, more than 10 per cent of annual energy production can be lost. LÄS MER