The Grimsvotn volcano, Iceland’s most active, began erupting Saturday, sending large plumes of ash into the atmosphere and halting air traffic in the region. As of this morning, Iceland’s main airport in Reykjavik remained closed while airlines and airports across Europe brace for possible disruptions. This brings back unpleasant memories of last year’s volcanic eruption as Europe clings to hope that the effect will not be nearly as dreadful.

Officials appeared to be responding to the ash with a radically different approach than last year, when European aviation authorities were sharply criticized for closing large swathes of airspace in response to the April 2010 eruption of another Icelandic volcano. Many airlines said authorities overestimated the danger to planes from the abrasive ash, and overreacted by closing airspace for five days. Thousands of flights were grounded, airlines lost millions of dollars and millions of travelers were stranded, many sleeping on airport floors across northern Europe.

Though meteorological officials predicted the ash to miss the European mainland, recent news reports claim that the Civil Aviation Authority expects disruption to UK flights.

We here at the Monitor followed last year’s eruption of the Eyjafjallajökull volcano very closely, posting about it’s amazing power with pics and video, about airports closing and how it was one of the top 10 disasters of the past decade, according to Zurich.

Stay tuned as we continue to post about Grimsvotn’s most powerful eruption in 100 years and its effects on travel and business. And visit The Atlantic for some amazing images of the eruption.