Influence of the Solar Cycle on the North Atlantic Oscillation
Journal of Geophysical Research: Atmospheres American Geophysical Union (AGU) 127:1 (2022)
Similar patterns of tropical precipitation and circulation changes under solar and greenhouse gas forcing
Environmental Research Letters IOP Publishing 16:10 (2021) 104045
Regime Behavior in the Upper Stratosphere as a Precursor of Stratosphere-Troposphere Coupling in the Northern Winter
Journal of Climate American Meteorological Society (2021) 1-53
Teleconnections of the Quasi-Biennial Oscillation in a multi-model ensemble of QBO-resolving models
Quarterly Journal of the Royal Meteorological Society Wiley 148:744 (2021) 1568-1592
Abstract:
The quasi‐biennial oscillation (QBO) dominates the interannual variability of the tropical stratosphere and influences other regions of the atmosphere. The high predictability of the QBO implies that its teleconnections could lead to increased skill of seasonal and decadal forecasts provided the relevant mechanisms are accurately represented in models. Here modelling and sampling uncertainties of QBO teleconnections are examined using a multi‐model ensemble of QBO‐resolving atmospheric general circulation models that have carried out a set of coordinated experiments as part of the Stratosphere‐troposphere Processes And their Role in Climate (SPARC) QBO initiative (QBOi). During Northern Hemisphere winter the stratospheric polar vortex in most of these models strengthens when the QBO near 50 hPa is westerly and weakens when it is easterly, consistent with, but weaker than, the observed response. These weak responses are likely due to model errors, such as systematically weak QBO amplitudes near 50 hPa, affecting the teleconnection. The teleconnection to the North Atlantic Oscillation is less well captured overall, but of similar strength to the observed signal in the few models that do show it. The models do not show clear evidence of a QBO teleconnection to the Northern Hemisphere Pacific‐sector subtropical jet.A wavelet transform method to determine monsoon onset and retreat from precipitation time‐series
International Journal of Climatology Wiley 41:11 (2021) 5295-5317