IMAGe Brown Bag - Detecting Teleconnection Patterns in Large-Scale Climate Data Using Spherical Harmonic Coefficients

08/15/2016 - 12:00pm to 1:00pm

Indranil Sahoo
North Carolina State University

Teleconnections refer to anomalies in climatic processes which are correlated over spatially separated regions. In this paper, we determine teleconnection patterns in large-scale climate data by detecting spatial anisotropy (changes in spatial pattern with direction) and connect them to global atmospheric phenomena. For this purpose we use the Spherical Harmonic Functions which are basis functions on the group of rotations in three dimensions and hence work well in explaining processes over a sphere. We use the fact that the spherical harmonic coefficients for an isotropic random field on a sphere are necessarily uncorrelated and look at regions where the observed random field deviates from the said characterization. We use data from the CMIP5 multi-model ensemble to illustrate our results. This is a joint work with Brian Reich and Joseph Guinness. Keywords: Teleconnection; Anisotropy; Spherical Harmonics

Monday, August 15, 2016
12:00-1:00 pm
Mesa Lab, Chapman Room
(Bring your lunch)