Brahim, Y.A., Wassenburg, J.A.,
Cruz, F.W., Sifeddine, A.,
Scholz, D., Bouchaou, L.,
Dassié, E.P., Jochum, K.P.,
Edwards, R.L. and Cheng, H.
2018
Multi-decadal to centennial
hydro-climate variability
and linkage to solar forcing
in the Western Mediterranean
during the last 1000 years.
Scientific Reports 8: 17446,
DOI:10.1038/s41598-018-35498-x.
NOTE:
Brahim et al. (2018)
note that
"information on
climate variability
in the Western
Mediterranean
remains scarce
due to the lack of
long instrumental
datasets,"
adding that
"high-resolution
paleoclimate
reconstructions
in this region
are thus essential
to increase our
understanding of
hydro-climate
variability on
various timescales
and to discuss
potential forcing
mechanisms."
SUMMARY:
Brahim et al. conclude
their work provides
"new proxy evidence
for centennial-scale
solar forcing"
of the climate
( unlike most
climate alarmists
who claim almost all
climate change
is from rising levels
of man made CO2
in the atmosphere. )
Brahim et al. report
"comparison with solar
forcing reconstructions
shows a striking consistency,
... with a clear correlation ..."
The authors say that
"negative phases of the
North Atlantic Oscillation
that bring precipitation
towards the Western
Mediterranean,
are observed during
well-known solar
minima periods,"
DETAILS:
The ten researchers
created two new high
resolution δ18O records
from two stalagmites
in caves that were
only a few 100 m apart
in Morocco
( Chaara cave and
Grotte de Piste,
~33.96°N, 4.25°W ),
which, when combined,
provided a composite proxy
for effective rainfall variability
over the past millennium.
The chart below shows
a comparison of a solar
modulation reconstruction (a)
and a proxy of
total solar irradiance (TSI) (b)
with the Northern Morocco
composite precipitation
reconstruction (Cha2-GP5) (c)
Light blue shading
indicates periods
of low solar activity:
Oort minimum (1010-1090 AD),
Wolf minimum (1280-1350 AD),
Spörer minimum (1450-1550 AD),
Maunder minimum (1645-1715 AD).
Dalton minimum (1790-1820 AD).
Black arrows indicate
peaks of low solar activity
and their corresponding peaks
of wet conditions in Morocco:
