Sökning: "numerisk vädermodell"

Hittade 2 uppsatser innehållade orden numerisk vädermodell.

1. 1. Improving Visibility Forecasts in Denmark Using Machine Learning Post-processing

   Master-uppsats, Uppsala universitet/Luft-, vatten- och landskapslära

   Författare :August Thomasson; [2023]
   Nyckelord :visibility forecast; fog; machine learning; numerical weather predicition; XGBoost; Random Forest; siktprognos; dimma; maskininlärning; numerisk vädermodell; XGBoost; Random Forest;

   Sammanfattning : Accurate fog prediction is an important task facing forecast centers since low visibility can affect anthropogenic systems, such as aviation. Therefore, this study investigates the use of Machine Learning classification algorithms for post-processing the output of the Danish Meteorological Institute’s operational Numerical Weather Prediction (NWP) model to improve visibility prediction. LÄS MER

3. 2. Snow or rain? - A matter of wet-bulb temperature

   Magister-uppsats, Uppsala universitet/Luft-, vatten- och landskapslära

   Författare :Arvid Olsen; [2003]
   Nyckelord :condensation scheme; HIRLAM; MESAN; rain formation; snow formation;

   Sammanfattning : Accurate precipitation-type forecasts are essential in many areas of our modern society andtherefore there is a need to develop proper working methods for this purpose. Focus of thiswork has been to study important physical processes decisive in deciding both the temperatureof the precipitation particles, hence affecting their phase, and the surrounding air. LÄS MER