Sentences with phrase «estimate volcanic cooling»

Hence, high latitude trees may in fact over estimate volcanic cooling.

Not exact matches

See e.g. this review paper (Schmidt et al, 2004), where the response of a climate model to estimated past changes in natural forcing due to solar irradiance variations and explosive volcanic eruptions, is shown to match the spatial pattern of reconstructed temperature changes during the «Little Ice Age» (which includes enhanced cooling in certain regions such as Europe).

It turns out that for the signal - to - noise ratios estimated for the individual tree - ring records, one would be hard pressed to cleanly isolate the volcanic cooling signal in individual records or even regional composites.

This reveals an ignorance of the literature, otherwise you'd know that the extent of aerosol cooling is estimated from the measured aerosol optical depth due to volcanic eruptions and their consequent impact on global temperature, and estimates of aerosol emissions during the 20th century.

Best estimate of natural external forcings in the past 50 years: Cooling, due to solar and volcanic measurements.

This means that volcanic aerosols have minimal long - term cooling effects and therefore, the warming effect of CO2 has to be much lower than assumed in Hansen's climate models and thus climate sensitivity estimates must be lowered even further.