Direct-sun column ozone from multifilter rotating shadowband radiometers compared with values retrieved from Brewer and Dobson spectrophotometers

Roger M. Tree; James R. Slusser

doi:10.1117/12.562500

14 October 2004 Comparison of column ozone retrievals obtained by UV multifilter rotating shadowband radiometer with those from Brewer and Dobson spectrophotometers

Roger M. Tree, James R. Slusser

Author Affiliations +

Proceedings Volume 5545, Ultraviolet Ground- and Space-based Measurements, Models, and Effects IV; (2004) https://doi.org/10.1117/12.562500
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

A limited evaluation of Ultraviolet Multifilter Rotating Shadowband Radiometer (UVMFRSR) based monitoring was conducted for instruments operated at the Mauna Loa Observatory, Hawaii 2/1/04 - 5/31/04. Two UV radiometers were installed, an UVMFRSR (shadowband) and a tracker mounted UVMFR (no shadowband). Measurements from the two UVMFR's, collocated Brewer and Dobson UV spectrophotometers, and the TOMS satellite, allowed a number of intercomparisons. The Langley-Forgan calibration technique proved more effective than lamp or Langley-SLR (simple linear regression) techniques when applied to an UVMFR that exhibited substantial change in response. Direct irradiance from an UVMFRSR compared very well with direct irradiance measured by a tracker mounted UVMFR for full-sun days (r²'s = 1). Mean ratios of the UV-MFRSR column ozone retrievals to the collocated Dobson and Brewer were 1.015 and 1.011 respectively. The mean ratio of UVMFRSR ozone to TOMS satellite ozone was 0.907. The UVMFRSR advantages of relatively low cost, unattended operation, automated calibration stability checks using Langley plots, and minimal maintenance make it a unique instrument for column ozone measurement.

Citation Download Citation

Roger M. Tree and James R. Slusser "Comparison of column ozone retrievals obtained by UV multifilter rotating shadowband radiometer with those from Brewer and Dobson spectrophotometers", Proc. SPIE 5545, Ultraviolet Ground- and Space-based Measurements, Models, and Effects IV, (14 October 2004); https://doi.org/10.1117/12.562500

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