We present 2500 years of reconstructed bottom water temperatures (BWT) using
a fjord sediment archive from the north-east Atlantic region. The BWT
represent winter conditions due to the fjord hydrography and the associated
timing and frequency of bottom water renewals. The study is based on a ca.
8 m long sediment core from Gullmar Fjord (Sweden), which was dated by
210Pb and AMS 14C and analysed for stable oxygen isotopes
(δ18O) measured on shallow infaunal benthic foraminiferal species
Cassidulina laevigata d'Orbigny 1826. The BWT, calculated using the
palaeotemperature equation from McCorkle et al. (1997), range between 2.7 and
7.8 °C and are within the annual temperature variability that has
been instrumentally recorded in the deep fjord basin since the 1890s. The
record demonstrates a warming during the Roman Warm Period ( ∼ 350 BCE–450 CE), variable BWT during the Dark Ages ( ∼ 450–850 CE),
positive BWT anomalies during the Viking Age/Medieval Climate Anomaly ( ∼ 850–1350 CE) and a long-term cooling with distinct multidecadal
variability during the Little Ice Age ( ∼ 1350–1850 CE). The fjord BWT
record also picks up the contemporary warming of the 20th century (presented
here until 1996), which does not stand out in the 2500-year perspective and
is of the same magnitude as the Roman Warm Period and the Medieval Climate
Anomaly.</p