1 In some months, the Ides is on the 15th, and in others, it is the 13th. 2  It's supposed to be on the day of the full moon. [See Roman Calendar.]. 3  March's Ides marked the beginning of the consular year: The two annually-elected Roman consuls took office on the Ides from c. 220 B.C. to 153.
In the case of Mount Pinatubo, the result was a measurable cooling of the Earthâs surface for a period of almost two years. Because they scatter and absorb incoming sunlight, aerosol particles exert a cooling effect on the Earthâs surface.The Pinatubo eruption increased aerosol optical depth in the stratosphere by a factor of 10 to 100 times normal levels measured prior to the eruption.ecause they scatter and absorb incoming sunlight, aerosol particles exert a cooling effect on the Earthâs surface. The Pinatubo eruption increased aerosol optical depth in the stratosphere by a factor of 10 to 100 times normal levels measured prior to the eruption.
The effects of the eruption were not limited to the area around Pinatubo. The eruption of Mt. Pinatubo affected weather around the globe. Huge quantities of particles from Pinatubo's tall ash cloud injected into the global wind system in the stratosphere.These particles affected the weather in two ways.Tiny aerosol droplets reflected sunlight away from Earth causing cooling at the surface. Scientists observed a maximum global cooling of about 1.5Â°C.uge quantities of particles from Pinatubo's tall ash cloud injected into the global wind system in the stratosphere. These particles affected the weather in two ways. Tiny aerosol droplets reflected sunlight away from Earth causing cooling at the surface. Scientists observed a maximum global cooling of about 1.5Â°C.