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Understanding and Forecasting Polar Stratospheric Variability with Statistical Models : Volume 12, Issue 2 (22/02/2012)

By Blume, C.

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Book Id: WPLBN0003976120
Format Type: PDF Article :
File Size: Pages 20
Reproduction Date: 2015

Title: Understanding and Forecasting Polar Stratospheric Variability with Statistical Models : Volume 12, Issue 2 (22/02/2012)  
Author: Blume, C.
Volume: Vol. 12, Issue 2
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Blume, C., & Matthes, K. (2012). Understanding and Forecasting Polar Stratospheric Variability with Statistical Models : Volume 12, Issue 2 (22/02/2012). Retrieved from http://community.ebooklibrary.org/


Description
Description: Helmholtz Centre Potsdam, German Research Centre for Geosciences (GFZ), Potsdam, Germany. The variability of the north-polar stratospheric vortex is a prominent aspect of the middle atmosphere. This work investigates a wide class of statistical models with respect to their ability to model geopotential and temperature anomalies, representing variability in the polar stratosphere. Four partly nonstationary, nonlinear models are assessed: linear discriminant analysis (LDA); a cluster method based on finite elements (FEM-VARX); a neural network, namely a multi-layer perceptron (MLP); and support vector regression (SVR). These methods model time series by incorporating all significant external factors simultaneously, including ENSO, QBO, the solar cycle, volcanoes, etc., to then quantify their statistical importance. We show that variability in reanalysis data from 1980 to 2005 is successfully modeled. FEM-VARX and MLP even satisfactorily forecast the period from 2005 to 2011. However, internal variability remains that cannot be statistically forecasted, such as the unexpected major warming in January 2009. Finally, the statistical model with the best generalization performance is used to predict a vortex breakdown in late January, early February 2012.

Summary
Understanding and forecasting polar stratospheric variability with statistical models

Excerpt
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