There are climate
affecting cycles
completely unrelated
to atmospheric
CO2 levels:
Probable
climate related
oscillations:
The Madden–Julian oscillation (MJO)
-- Eastward moving pattern of
increased rainfall over the
tropics with a period of
30 to 60 days.
The Quasi-biennial oscillation
-- Oscillation in wind patterns
in the stratosphere around
the equator. The dominant
wind direction changes
from easterly to westerly
and back over a period
of 28 months.
The El Niño Southern Oscillation
-- Warmer (el Nino)
and colder (la Nina)
sea surface temperature trends
in the tropical Pacific Ocean
sufficient to affect the global
average temperature
-- a 2 to 8 year cycle
tending to sum to zero
temperature change
over several decades.
The Pacific Decadal Oscillation
-- Sea surface variability in the
North Pacific.
The Inter-decadal
Pacific Oscillation
-- A basin wide variability
in the Pacific Ocean
with a period between
20 and 30 years.
Atlantic Multidecadal Oscillation
-- Variability in the North Atlantic
of about 55 to 70 years,
with effects on rainfall,
droughts and hurricane
frequency and intensity.
The Pacific Centennial Oscillation
60-year climate cycle recorded
in many ancient calendars.
North African climate cycles
Tens of thousands of years
Milankovitch planetary
geometry cycles of 23,000,
41,000 and 100,000 years
The glacial periods
of the current ice age
of about 100 000 years,
( including a 10,000 year
warm interglacial and
90,000 cold years ).
Some natural solar cycles,
whose effects on climate
have not yet been discovered,
assuming any effects exist:
The Schwabe Cycle
or sunspot cycle
– about 11 years
The Hale Cycle
or double sunspot cycle
– about 22 years
The Gleissberg Cycle
– about 88 years
The Suess Cycle
or De Vries Cycle
– about 200 years
The Hallstadtzeit /
Hallstatt Cycle
– about 2,200 to 2,400 years