Flashcard library · Earth & Climate Science · PaperFren

North Atlantic SSTs lead UK summer droughts

A North Atlantic freshwater–SST pathway leads UK summer rainfall and streamflow droughts by about 1.5 years.

Keep what you just learned

Save these 11 cards to your NoteFren library. Your first review starts right away, and each card links back to the study it came from.

What lag links North Atlantic SST patterns to UK hydrology?

About 1.5 years from winter subpolar cold anomaly to the following summer.

Which SST indices did the authors build?

Winter SCA-JFM (subpolar cold anomaly) and summer NAC-JJA (northward NAC shift).

Where does streamflow not follow the SST indices?

Groundwater-driven catchments in the southeast UK.

Which four summers had the highest NAC-JJA values?

1976, 1995, 2018 and 2022.

What atmospheric shift accompanied those droughts?

A poleward-shifted North Atlantic jet stream and storm track.

What winter SST pattern precedes the drought summers?

A tripole: cold subpolar and tropical North Atlantic, warm mid-latitude band.

How does summer freshwater help create the winter SCA?

Freshening stratifies the surface so extra cooling is needed before water can sink, leaving cold SST anomalies.

Why is rainfall alone not enough to study water-resource drought?

Not all meteorological droughts propagate into hydrological droughts.

Over what period were Pearson correlations computed?

1950–2020.

How many catchments provided SSI?

864 UK catchments.

What correlation links winter SCA-JFM to next-year NAC-JJA?

0.45.