Sentences with phrase «volcanic gas may»
Study Suggests Component of Volcanic Gas May Have Played a Significant Role in the Origins of Life on Earth - Scientists are reporting a possible answer to a longstanding question — how did the first amino acids form the first peptides?
http://www.scripps.edu/ Not exact matches
Depending on the size and depth of an underwater eruption, gas and ash may never break the ocean surface, or the gas and ash could create a volcanic plume with the potential to interfere with air travel.
A similar fate may have befallen forests 252 million years ago, when massive bursts of volcanic gases likely weakened Earth's ozone shield.
So the report notes that the current «pause» in new global average temperature records since 1998 — a year that saw the second strongest El Nino on record and shattered warming records — does not reflect the long - term trend and may be explained by the oceans absorbing the majority of the extra heat trapped by greenhouse gases as well as the cooling contributions of volcanic eruptions.
I won't argue that our added gases may contribute to the warming to some very, very small degree, but keep in mind, the ash plume from a good volcanic eruption such as the last big Pinatubo eruption eclipses into insignificants the amount of pollutants added to the atmosphere by human activity.
In contrast, super-Earths with a similar concentration but larger absolute amount of radioactive heat sources (i.e., uranium and thorium) than Earth would produce more internal heat, more vigorous mantle convection, and faster plate tectonic action involving thinner plates, which may promote planetary habitability with lower mountain ranges but higher volcanic activity and an atmosphere with a greater relative composition of volcanic and lighter gases (Sasselov and Valencia, Scientific American, August 2010; Valencia and O'Connell, 2009; and Valencia et al, 2007).
I won't argue that our added gases may contribute to the warming to some very, very small degree, but keep in mind, the ash plume from a good volcanic eruption such as the last big Pinatubo eruption eclipses into insignificants the amount of pollutants added to the atmosphere by human activity.
Once it became apparent that the 1999 seismic swarm at 85E on the Gakkel Ridge was associated with large volcanic explosions, and that the jets of hot gas and molten lava may have reached upwards well into the overlying water column, I began to search for satellite imagery of the region to see if there was any direct evidence that the overlying ice had been affected.
«Since 1997, when Pinatubo's aerosol settled out, the stratosphere has been exceptionally clear... Half or more of the warming since 1995 may due to the lack of large volcanic eruptions... That's about 0.13 °C... The remaining climate change is presumably caused by other forces, such as solar variability, El Nino, Atlantic AMO warming in 1995, lower Albedo and maybe even a little greenhouse gas.»
Li et al., 2017 (DOI: 10.1016 / j.quascirev.2017.01.009): «Additionally, increased El Nino - Southern Oscillation (ENSO) strength (possibly El Ni ~ no - like phases) during drying periods, increased volcanic eruptions and the resulting aerosol load during cooling periods, as well as high volumes of greenhouse gases such as CO2 and CH4 during the recent warming periods, may also play a role in partly affecting the climatic variability in NC, superimposing on the overall solar dominated long - term control.»
If it is mainly greenhouse gases, the trend should go on to the positive side... Of course, a large volcanic eruption may — temporarely — change that all.
The models (and there are many) have numerous common behaviours — they all cool following a big volcanic eruption, like that at Mount Pinatubo in 1991; they all warm as levels of greenhouse gases are increased; they show the same relationships connecting water vapour and temperature that we see in observations; and they can quantify how the giant lakes left over from the Ice Age may have caused a rapid cooling across the North Atlantic as they drained and changed ocean circulation patterns.