Sentences with phrase «combination of volcanic activity»

Despite some controversial evidence that an asteroid or comet caused the worst mass extinction in history, most researchers now believe a combination of volcanic activity and a warming climate was the cause.

It is formed by a natural combination of volcanic activity and geothermal changes.

Not exact matches

(The five previous extinction events all came before the evolution of Homo sapiens, apparently triggered by a cataclysmic event or combination of events, such as a fall in sea level, an asteroid impact, volcanic activity.)

The team thinks a combination of fluid and solid tidal heating effects may best explain all the volcanic activity observed on Io.

As discussed elsewhere on this site, modeling studies indicate that the modest cooling of hemispheric or global mean temperatures during the 15th - 19th centuries (relative to the warmer temperatures of the 11th - 14th centuries) appears to have been associated with a combination of lowered solar irradiance and a particularly intense period of explosive volcanic activity.

Also contributing to the diversity are the geologic forces that forged a unique landscape through a combination of tectonic uplift, volcanic activity and coralline formation.

The warming period from about 1920 — 1950 has been attributed to a combination of greenhouse gases (which were increasing through the period to some extent), solar changes, and unusually low volcanic activity.

I belive it is quite possible that a combination of low solar activity and high volcanic activity could push the world over the edge.

It's a combination of factors - the Earth's orbital cycles, land cover changes, and solar and volcanic activity changes.

Stott analyzed the response of HadCM3 with different combinations of forcings, varying greenhouse gases, sulfate and ozone components, and volcanic activity, and with three solar models, HS, LBB, and an update to LBB designated as Lean et al. (1995a).

The methods of Black Box Model Identification applied to an energy balance model provide directly the so called «equilibrium sensitivities» with respect to three inputs: CO2; solar and volcanic activities; this is shown by Prof. de Larminat in his book «Climate Change: Identifications and projections «[77] where Identification techniques well known in industrial processes, are applied to 16 combinations of historical reconstructions of temperatures (Moberg, Loehle, Ljungqvist, Jones & Mann) and of solar activity proxies (Usoskin - Lean, Usoskin - timv, Be10 - Lean, Be10 - timv) for the last millennium, with some series going back to year 843.

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.

Definitely yes, at some point in the future (billions of years), something not experienced on Earth will be affecting the climate, but over the relatively shorter - term, the same physical mechanisms control the climate, just playing on variations on the combinations, timing, and intensity of those mechanisms: namely: Milankovitch cycles, GHG concentrations, ocean cycles, hydrological cycle, volcanic activity, solar cycles, biosphere interactions, location of continents, etc..

All the yearly and decadal wiggles in the GMST curves are due to a combination of SOI (i.e. ENSO) and volcanic activities (with a slight contribution from TSI).

Over the next decade, changes in climate are expected to be due to a combination of anthropogenic changes in atmospheric greenhouse - gas and aerosol concentrations; natural variations in volcanic and solar activity, and natural, unforced internal variability.

You aren't thinking about the warming period early last century, because we know it was a relatively brief period, and so lacked huge significance, and was caused by a combination of CO2 emissions, high solar activity and low volcanic activity and the later two factors haven't been apparent since the 1970's modern warming period.

The substantial warming during the period 1910 - 1940 has been attributed by nearly all the modeling groups to some combination of increasing solar irradiance and a lack of major volcanic activity.