Joint Seminar: Regional teleconnection patterns: Australia, the West Siberian Plain, and the ENSO region

This talk combines two papers and some preliminary results on teleconnections. One teleconnection is forced by extratropical waves that can be deflected from the Northern Hemisphere polar regions and travel southeastward over central Asia toward the western Pacific warm pool during northern winter. The wave pattern resembles the east Atlantic–west Russia pattern and influences the El Niño–Southern Oscillation (ENSO) region. It can be used as a predictor for the strength of emerging El Niños with the positve phase (low pressure over West Siberia) leading to east Pacific El Niños and the negative phase leading to central Pacific El Niños. This pattern also modifies the subtropical bridge between tropical eastern Pacific and subtropical North Atlantic suggesting a circumglobal wave train.
Another teleconnection occurs between the Tasman Sea and the Southern Ocean. It is related to El Niño–Southern Oscillation (ENSO), the Indian Ocean dipole (IOD), and the southern annular mode (SAM). This teleconnection is significantly correlated with SAM during austral summer, fall, and winter, with IOD during spring, and with ENSO in summer. It can thus be described as a hybrid between these modes. Strong amplitudes in this pattern can be related to the initial phase of long term droughts over Australia.

Some preliminary results include the attribution of temperature and precipitation changes over North America to combinations of teleconnections such as Pacific–North American pattern (PNA) and Northern Hemisphere annular mode (NAM) in addition to influences from ENSO and Atlantic Multidecadal Oscillation (AMO).

Datum

20.12.2017

Uhrzeit

13:30 Uhr

Ort

Bundesstr. 53, room 022/023
Seminar Room 022/023, Ground Floor, Bundesstrasse 53, 20146 Hamburg, Hamburg

ReferentIn

Stefan Liess, University of Minnesota

Chair

Traute Crueger

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