Geomagnetic activity and polar surface air temperature variability

A Seppala, C. E. Randall, M. A. Clilverd, E Rozanov, C. J. Rodger

Research output

107 Citations (Scopus)

Abstract

Here we use the ERA-40 and ECMWF operational surface level air temperature data sets from 1957 to 2006 to examine polar temperature variations during years with different levels of geomagnetic activity, as defined by the A(p) index. Previous modeling work has suggested that NOx produced at high latitudes by energetic particle precipitation can eventually lead to detectable changes in surface air temperatures (SATs). We find that during winter months, polar SATs in years with high A(p) index are different than in years with low A(p) index; the differences are statistically significant at the 2-sigma level and range up to about +/- 4.5 K, depending on location. The temperature differences are larger when years with wintertime Sudden Stratospheric Warmings (SSWs) are excluded. We take into account solar irradiance variations, unlike previous analyses of geomagnetic effects in ERA-40 and operational data. Although we cannot conclusively show that the polar SAT patterns are physically linked by geomagnetic activit
Original languageUndefined
JournalJournal of Geophysical Research
Volume114
DOIs
Publication statusPublished - 2009
Externally publishedYes

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