Chemistry & Climate Processes: Products

SSWC: Sudden Stratospheric Warming Compendium data set

Table of major mid-winter SSWs in reanalyses products

The date of the major warming is calculated for each reanalysis product using daily-mean zonal winds at 60N and 10 hPa, where the winds must return to westerly for 20 consecutive days between events, and for at least 10 days prior to April 30, following Charlton and Polvani (2007).

The El Niño-Southern Oscillation (ENSO) phase (E = El Niño, L = La Niña, N = Neutral) is defined following the convention of the NOAA/NCEP Climate Prediction Center, which is based on the Oceanic Niño Index (ONI) using ERSSTv4 data.

The Quasi-Biennial Oscillation (QBO) phase (E = easterly, W = westerly) is defined using the DJF-mean equatorial QBO time series at 50 hPa from the Freie Universität Berlin.

Event NameNCEP-NCARERA40ERA-InterimJRA-55MERRA2ENSOQBO 50mb
JAN 195830-Jan-5831-Jan-5830-Jan-58EW
NOV 195830-Nov-58********EE
JAN 196016-Jan-6017-Jan-6017-Jan-60NW
JAN 1963****28-Jan-6330-Jan-63NE
MAR 196523-Mar-65********LW
DEC 19658-Dec-6516-Dec-6518-Dec-65EE
FEB 196624-Feb-6623-Feb-6623-Feb-66EE
JAN 1968****7-Jan-687-Jan-68LW
NOV 196827-Nov-6828-Nov-6829-Nov-68EE
MAR 196913-Mar-6913-Mar-69****EE
JAN 19702-Jan-702-Jan-702-Jan-70EW
JAN 197117-Jan-7118-Jan-7118-Jan-71LE
MAR 197120-Mar-7120-Mar-7120-Mar-71LE
JAN 19732-Feb-7331-Jan-7331-Jan-73EE
JAN 1977****9-Jan-779-Jan-77EE
FEB 197922-Feb-7922-Feb-7922-Feb-7922-Feb-79NW
FEB 198029-Feb-8029-Feb-8029-Feb-8029-Feb-8029-Feb-80EE
FEB 1981************6-Feb-81****NW
MAR 1981****4-Mar-814-Mar-814-Mar-81****NW
DEC 19814-Dec-814-Dec-814-Dec-814-Dec-814-Dec-81NE
FEB 198424-Feb-8424-Feb-8424-Feb-8424-Feb-8424-Feb-84NW
JAN 19852-Jan-851-Jan-851-Jan-851-Jan-851-Jan-85LE
JAN 198723-Jan-8723-Jan-8723-Jan-8723-Jan-8723-Jan-87EW
DEC 19878-Dec-878-Dec-878-Dec-878-Dec-878-Dec-87EW
MAR 198814-Mar-8814-Mar-8814-Mar-8814-Mar-8814-Mar-88EW
FEB 198922-Feb-8921-Feb-8921-Feb-8921-Feb-8921-Feb-89LW
DEC 199815-Dec-9815-Dec-9815-Dec-9815-Dec-9815-Dec-98LE
FEB 199925-Feb-9926-Feb-9926-Feb-9926-Feb-9926-Feb-99LE
MAR 200020-Mar-0020-Mar-0020-Mar-0020-Mar-0020-Mar-00LW
FEB 200111-Feb-0111-Feb-0111-Feb-0111-Feb-0111-Feb-01LW
DEC 20012-Jan-0231-Dec-0130-Dec-0131-Dec-0130-Dec-01NE
FEB 2002****18-Feb-02********17-Feb-02NE
JAN 200318-Jan-0318-Jan-0318-Jan-0318-Jan-03EW
JAN 20047-Jan-045-Jan-045-Jan-045-Jan-04NE
JAN 200621-Jan-0621-Jan-0621-Jan-0621-Jan-06NE
FEB 200724-Feb-0724-Feb-0724-Feb-0724-Feb-07EW
FEB 200822-Feb-0822-Feb-0822-Feb-0822-Feb-08LE
JAN 200924-Jan-0924-Jan-0924-Jan-0924-Jan-09NW
FEB 20109-Feb-109-Feb-109-Feb-109-Feb-10EW
MAR 201024-Mar-1024-Mar-1024-Mar-1024-Mar-10EW
JAN 20137-Jan-136-Jan-137-Jan-136-Jan-13NE
Total Events3629243723
Frequency: Events/Decade6.26.46.56.46.4

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Table prepared by Dr. A.H. Butler for the SSWC.