Analysis of radiosonde and ground-based remotely sensed PWV data from the 2004 North Slope of Alaska Arctic Winter Radiometric Experiment

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Mattioli, Vinia [1 ,2 ]
Westwater, E.R. [3 ]
Cimini, D. [3 ,4 ]
Liljegren, J.C. [5 ]
Lesht, B.M. [5 ]
Gutman, S.I. [6 ]
Schmidlin, F.J. [7 ]
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[1] Dipartimento di Ingegneria Elettronica e dell'Informazione, Università di Perugia, via G. Duranti 93, 06125 Perugia, Italy
[2] Science and Technology Corporation, Hampton, VA, United States
[3] Cooperative Institute for Research in Environmental Sciences, University of Colorado, NOAA/ESRL Physical Sciences Division, Boulder, CO, United States
[4] Institute of Methodologies for Environmental Analysis, National Research Council, Tito Scalo, Italy
[5] DOE, Argonne National Laboratory, Argonne, IL, United States
[6] NOAA, Forecast Systems Laboratory, Boulder, CO, United States
[7] NASA Goddard Space Flight Center, Wallops Flight Facility, Wallops Island, VA, United States
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During; 9; March-9; April; 2004; the North Slope of Alaska Arctic Winter Radiometric Experiment was conducted at the Atmospheric Radiation Measurement Program's (ARM) Great White field site near Barrow; Alaska. The major goals of the experiment were to compare microwave and millimeter wavelength radiometers and to develop forward models in radiative transfer; all with a focus on cold (temperature from 0° to -40°C) and dry [precipitable water vapor (PWV) < 0.5 cm] conditions. To supplement the remote sensors; several radiosonde packages were deployed: Vaisala RS90 launched at the ARM Duplex and at the Great White and Sippican VIZ-B2 operated by the NWS. In addition; eight dual-radiosonde launches were conducted at the Duplex with Vaisala RS90 and Sippican GPS Mark II; the latter one modified to include a chilled mirror humidity sensor. Temperature comparisons showed a nighttime bias between VIZ-B2 and RS90; which reached 3.5°C at 30 hPa. Relative humidity comparisons indicated better than 5% average agreement between the RS90 and the chilled mirror. A bias of about 20% for the upper troposphere was found in the VIZ-B2 and the Mark II measurements relative to both RS90 and the chilled mirror. Comparisons in PWV were made between a microwave radiometer; a microwave profiler; a global positioning system receiver; and the radiosonde types. An RMS agreement of 0.033 cm was found between the radiometer and the profiler and better than 0.058 cm between the radiometers and GPS. RS90 showed a daytime dry bias on PWV of about 0.02 cm. © 2007 American Meteorological Society;
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页码:415 / 431
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