Cloud Optical Depths and Liquid Water Paths at the NSA CART

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Cloud optical depths have been measured using multifilter rotating shadowband radiometers (MFRSRs) at Barrow and Atqasuk, and liquid water paths have been measured at Barrow using a microwave radiometer (MWR) during the warm season (June-September) in 1999. Comparisons have been made between these quantities and the corresponding ones determined from the ECMWF GCM. Hour-by-hour comparisons of cloud optical depths show considerable scatter. The scatter is reduced, but is still substantial, when the averaging period is increased to ''daily'' averages, i.e., the time period each day over which the MFRSR can make measurements. This period varied between 18 hours in June ... continued below

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Doran, J. C.; Barnard, James C.; Zhong, Shiyuan & Jakob, C J. March 14, 2000.

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Cloud optical depths have been measured using multifilter rotating shadowband radiometers (MFRSRs) at Barrow and Atqasuk, and liquid water paths have been measured at Barrow using a microwave radiometer (MWR) during the warm season (June-September) in 1999. Comparisons have been made between these quantities and the corresponding ones determined from the ECMWF GCM. Hour-by-hour comparisons of cloud optical depths show considerable scatter. The scatter is reduced, but is still substantial, when the averaging period is increased to ''daily'' averages, i.e., the time period each day over which the MFRSR can make measurements. This period varied between 18 hours in June and 6 hours in September. Preliminary results indicate that, for measured cloud optical depths less than approximately 25, the ECMWF has a low bias in its predictions, consistent with a low bias in predicted liquid water path. Based on a more limited set of data, the optical depths at Atqasuk were found to be generally lower than those at Barrow, a trend at least qualitatively captured by the ECMWF model. Analyses to identify the cause of the biases and the considerable scatter in the predictions are continuing.

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  • Proceedings of the Tenth Atmospheric Radiation Measurement (ARM) Science Team Meeting, March 13-17, 2000 San Antonio, Texas, 7 pages

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  • Report No.: PNNL-SA-32743
  • Grant Number: AC05-76RL01830
  • Office of Scientific & Technical Information Report Number: 887035
  • Archival Resource Key: ark:/67531/metadc885531

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  • March 14, 2000

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  • Sept. 21, 2016, 2:29 a.m.

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  • Oct. 26, 2016, 1:17 p.m.

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Doran, J. C.; Barnard, James C.; Zhong, Shiyuan & Jakob, C J. Cloud Optical Depths and Liquid Water Paths at the NSA CART, article, March 14, 2000; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc885531/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.