These variations originate primarily from fluctuations in carbon uptake by land ecosystems
driven by the natural variability of the climate system, rather than by oceans or from changes in the levels of human - made carbon emissions.
On the other hand, some of the long - term change in the AMO could be
driven by natural variability, e.g. fluctuations in thermohaline flow.
Not exact matches
Some experiments were considered quirky
by 19th century standards, but the work provided data supporting Darwin's notions about trait
variability in a population and how
natural selection
drives changes in populations over time.
«Although this widening is considered a «
natural» mode of climate
variability, implying tropical widening is primarily
driven by internal dynamics of the climate system, we also show that anthropogenic pollutants have
driven trends in the PDO,» Allen said.
Results from climate models
driven by estimated radiative forcings for the 20th century (Chapter 9) suggest that there was little change prior to about 1915, and that a substantial fraction of the early 20th - century change was contributed
by naturally occurring influences including solar radiation changes, volcanism and
natural variability.
Ultimately, in forests not otherwise limited
by energy or nutrients
variability in moisture availability with
natural and climate oscillations may
drive establishment success between years (League and Veblen 2006), with indirect disturbance effects (e.g., fires, landslides, insect outbreaks, and pathogen attacks) greatly affecting long - term recruitment success (Clark et al. 2016).
Climate is
driven now
by components of
natural variability and human components added to the forcing of the climate.
Despite your insistence otherwise, you evince at best a shallow understanding of basic principles of climate science (hint: while radiative forcing is known to be at least partially controlled
by atmospheric CO2, no «
natural», i.e. internal source of
variability has been demonstrated that could
drive a global temperature trend for half a century), as well as an inability to recognize genuine expertise.
This viewpoint appears to have been
driven into the IPCC
by a strong desire for lower
natural variability from the climate modelling community and was largely done off the back of the seriously flawed MBH paper.
The last year or so,
driven by the unexplained hiatus in warming, we have seen substantially more attention being given to research on
natural climate
variability.
In my earlier posting, I tried to make the distinction that global climate change (all that is changing in the climate system) can be separated into: (1) the global warming component that is
driven primarily
by the increase in greenhouse gases, and (2) the
natural (externally unforced)
variability of the climate system consisting of temperature fluctuations about an equilibrium reference point, which therefore do not contribute to the long - term trend.
Much of what is of concern to the military is extreme weather events (e.g. Pakistan floods)
driven by natural climate
variability and random weather roulette (concerns about sea level rise and the opening of the Arctic Ocean are linked more closely to AGW)
Bob Tisdale, «And regardless of whether or not the AMO is
driven by THC / AMOC or
by ENSO, it's still a
natural form of
variability and it also contributes significatly to the overall rise in global temps from the trough in the early 1900s to present.»
These glaciers are being eaten away from underneath due to warm ocean waters that have been
driven toward the continent
by shifting wind patterns that have in turn been linked to manmade global warming, as well as
natural climate
variability.
Our results suggest that the decadal AO and multidecadal LFO
drive large amplitude
natural variability in the Arctic making detection of possible long - term trends induced
by greenhouse gas warming most difficult.
While there may indeed be additional energy in the system as a result of greenhouse gases — it is set against a background of large
natural variability driven by internal climate processes.
It is very unlikely that Northern Hemisphere temperature variations from 1400 to 1850 can be explained
by natural internal
variability alone; — something, such as changes in solar and / or volcanic activity, must have
driven the changes.
They then looked at whether these changes could be explained as
natural or as a consequence of human influence, and pinned a proportion of the blame on
natural variability − some of it
driven by long - term changes in the tropics.
Given that the high - latitude trends are closely associated with the two PSA modes, and that these modes have been linked with ENSO
variability (e.g. Mo 2000) and with tropical deep convection (Mo and Higgins 1998), it is
natural to hypothesize that the high - latitude trends may be
driven by changes in low - latitude SSTs.
We don't know whether or not
natural sinks have grown in recent decades... — McKinley et al., 2017 «The sum of the available evidence indicates that
variability in the ocean carbon sink is significant and is
driven primarily
by physical processes of upwelling, convection, and advection.
The big question now becomes how much is anthropogenic forcing affecting the
natural internal
variability that formerly (prior to the mid-20th century) was
driven by solar
variability and ocean cycles.
So really forced = external and unforced = internal both terms relative to a specific system, but either is «
natural variability» not
driven by human activity.
Natural climate
variability driven by the ocean appears to have held greenhouse warming at bay the past few years, but the warming, according to the forecast, should come roaring back before the end of the decade.
At very best, his jumbled paper indicates that a) warming Arctic loses ice mass and b) the rate fluctuates with
natural variability possibly
driven by various influences.