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Arctic Water Vapor IOP 2004 Preliminary Results

GSR Tb times series

Times series of GSR brightness temperatures, extending from 2004/03/09 to 2004/03/18 in Barrow, AK, during the WVIOP for the 50-60 GHz channels, the 89 GHz, the 183 GHz, the 340 GHz and the 380 GHz channels. For about the same time interval a composite figure with Cloud Radar, Micropulse Lidar, and MWR observations is shown.

50 GHz timeseries.
50 GHz timeseries.
89 GHz timeseries
89 GHz timeseries.
183 GHz timeseries
183 GHz timeseries.
340 GHz timeseries
340 GHz timeseries.
380 GHz timeseries
380 GHz timeseries.

Cloud Radar, Micropulse Lidar and MWR Composite

Cloud Radar, Micropulse Lidar and MWR Composite
Composite image of Cloud Radar, Micropulse Lidar and MWR observations for the first six days of the IOP. Clear sky, low cloud, mid-level clouds, mixed-phased clouds were observed.

GSR brightness temperatures
GSR brightness temperatures (Tbs) at 53.8 GHz, 54.9 GHz, 183.3±0.5 GHz, 183.3±3 GHz and 380.2 GHz compared with simulated Tbs from the National Weather Service sondes in Barrow (green dots), and Vaisala sondes launched at ARM Duplex (black dots) and at Great White (cyan dots).

Precipitable Water Vapor
Precipitable Water Vapor (PWV) retrieval in Barrow, AK, from the dual channel MWR with both ARM calibration (Liljegren 2000) and ETL calibration applied (Han and Westwater 2000), GPS and Radiosondes from the National Weather Service sondes in Barrow (pink dots), and Vaisala sondes launched at ARM Duplex (red dots) and at Great White (cyan dots).

Data from the Infrared Cloud Imager

infrared radiance spectrum of the sky
High quality images of the infrared radiance spectrum of the sky were obtained throughout the experiment by the ICI. Mixed cloud features with temperatures in the -20 °C range, with the much colder clear sky portions of -50 to -60 °C can be seen from the figure.