Sentences with phrase «volcanic influence on»

The Hansen paper is an extreme case, combining a strong volcanic forcing with a model with high sensitivity, and so probably provides an upper bound for the volcanic influence on temperature.

Bertrand was investigating the effect of solar and volcanic influence on climate and concluded «these are clearly not sufficient to explain the observed 20th century warming and more specifically the warming trend which started at the beginning of the 1970s».

Not exact matches

We already know that climate change has a hold on Earth's surface processes, such as erosion and fluctuations in sea levels... but do surface processes in turn have an influence on volcanic activity?

These results, which you can read all about in the journal Nature Geoscience, reveal the influence of surface processes — largely controlled by climate — on volcanic activity.

In years influenced by volcanic eruptions, Nile flooding was generally diminished, leading to social stress that could trigger unrest and have other political and economic consequences,» says Joseph Manning, lead author on the paper and the William K. & Marilyn Milton Simpson Professor of History and Classics at Yale.

Molten rock (or magma) has a strong influence on our planet and its inhabitants, causing destructive volcanic eruptions and generating some of the giant mineral deposits.

One just included the effective influence on temperatures from manmade forces (including greenhouse gases and aerosols, which tend to have a cooling effect), while the second included both manmade and natural ones (including volcanic activity and solar radiation).

For volcanic, there may be some overestimating of historical influences, as the influence of temperature and reduced solar input (less insolation) on tree rings is hardly to separate.

Additional eruptions added from tree ring data reported in Table 2 of Briffa, KR, PD Jones, FH Schweingruber & TJ Osborn, 1998, Influence of volcanic eruptions on Northern hemisphere summer temperature over the past 600 years: Nature 393, 450 - 455.

The uncertainty in the overall amplitude of the reconstruction of volcanic forcing is also important for quantifying the influence of volcanism on temperature reconstructions over longer periods, but is difficult to quantify and may be a substantial fraction of the best estimate (e.g., Hegerl et al., 2006a).

Additional eruptions added from tree ring data reported in Table 2 of Briffa, KR, PD Jones, FH Schweingruber & TJ Osborn, 1998, Influence of volcanic eruptions on Northern hemisphere summer temperature over the past 600 years: Nature 393, 450 - 455.

Any change in the strength of natural (volcanic, solar) influences based on historical variations will have an opposite effect on the influence of greenhouse gases, and thus on man - made emissions.

For volcanic, there may be some overestimating of historical influences, as the influence of temperature and reduced solar input (less insolation) on tree rings is hardly to separate.

Re # 92:... reconstructions based only on tree rings may overestimate the influence of volcanic eruptions, as not only the temperature is reduced, but there is also a change in direct and diffuse incoming sunlight...

If one takes the MBH98 / 99 reconstruction as base, the variation in the pre-industrial period was ~ 0.2 K, of which less than 0.1 K (in average) from volcanic eruptions, the rest mostly from solar (I doubt that land use changes had much influence on global temperatures).

IIRC, long - term volcanic forcing is negligible, and solar influence is not a major factor (15 % on decadal time scales according to Trenberth).

A true «prediction» can't be made because the result will depend on the future volcanic eruptions and other influences on albedo, but you can run the model for each of a couple dozen stochastic processes for the future volcanic activity.

We instead conclude that solar forcing probably had a minor effect on Northern Hemisphere climate over the past 1,000 years, while, volcanic eruptions and changes in greenhouse gas concentrations seem to be the most important influence over this period.

Vernier, J. - P., L.W. Thomason, et al. 2011: Major influence of tropical volcanic eruptions on the stratospheric aerosol layer during the last decade.

In the text: «These simulations suggest that solar and volcanic forcing (Fan et al., 2009; Liu et al., 2009a; Man et al., 2012) may exert only weak regional influences on monsoon systems.»

Bradley, R.S. and England, J., 1978: Influence of volcanic dust on glacier mass balance at high latitudes.

The origin of the 1400 - period begins with the 1998 paper in Nature «Influence of volcanic eruptions on northern hemisphere summer temperature over the past 600 years» As the title suggests, the paper is primarily about identifying eruptions with spikes in the record.

Their workings discount natural influences; solar radiation, clouds, volcanic eruptions, ocean currents PDO / AMO as having any real effect on the climate.

There is also another paper in discussion on the pitfalls of assuming you can remove solar / volcanic / ENSO influences with any confidence.

Scientists have already speculated that volcanic cycles on land emitting large amounts of carbon dioxide might influence climate; but up to now there was no evidence from submarine volcanoes.

The influence of volcanic activity on the climate is indubitable.

Alex's simple model is worthy of further refinement to accommodate the influence of solar fluctuations, volcanic activity, changes in GHG and the influence of clouds, My hunch is that while these factors on their own would have a relatively minor effect on climate trends, they may impact much more when their incidence is synchronised.

http://www.agci.org/docs/lean.pdf «Global (and regional) surface temperature fluctuations in the past 120 years reflect, as in the space era, a combination of solar, volcanic, ENSO, and anthropogenic influences, with relative contributions shown in Figure 6.22 The adopted solar brightness changes in this scenario are based on a solar surface flux transport model; although long - term changes are «50 % larger than the 11 - year irradiance cycle, they are significantly smaller than the original estimates based on variations in Sun - like stars and geomagnetic activity.

«Because the effects of volcanic eruptions and of ENSO are very short - term and that of solar variability very small, none of these factors can be expected to exert a significant influence on the continuation of global warming over the coming decades.

The largest natural influences on the global temperature are the 11 - year solar cycle, volcanic activity, and the El Nino Southern Oscillation (ENSO).

Major volcanic eruptions have a short - term cooling influence on climate due to the particulate haze they cause.

Forster et al. (2007) described four mechanisms by which volcanic forcing influences climate: RF due to aerosol — radiation interaction; differential (vertical or horizontal) heating, producing gradients and changes in circulation; interactions with other modes of circulation, such as El Niño - Southern Oscillation (ENSO); and ozone depletion with its effects on stratospheric heating, which depends on anthropogenic chlorine (stratospheric ozone would increase with a volcanic eruption under low - chlorine conditions).

From solar min to solar max the influence on temp has been estimated at around 0.1 deg C (some scientists came to 0.2), and the LIA was at least partly influenced by a sustained period of low solar activity, combined with high volcanic activity (see eg the wikipedia link I provided in the blog post).