New observations of clouds, atmosphere, and precipitation at Summit, Greenland

In spring 2010, the ongoing activities at Summit Station, Greenland were augmented with a new suite of cloud- and atmosphere-observing instruments. New observing capabilities include active sensors (radars and lidars), passive sensors (microwave radiometers and infrared spectrometers), and a twice-daily radiosonde program. Initial measurements at the site show cloud structures that are in many ways similar to those observed at other, lower-altitude Arctic locations, including the occurrence of stratiform mixed-phase clouds, low-level ice clouds, and periodic, deeper precipitating systems. However, the Greenland Ice Sheet is significantly different from most other Arctic locations due to its altitude, potential topographic influences, homogeneous ice/snow surface, and long distances from pollution and ocean influences. Many of the new observations from Summit Station will be highlighted, and the first year's cloud characteristics will be placed within the context of previous cloud observations at other Arctic observatories.