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Use of rotating shadowband radiometers and microwave radiometers to obtain cloudproperties in arctic environments

机译：使用旋转阴影带辐射计和微波辐射计在北极环境中获得云性能

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The multi-filter rotating shadowband radiometer (MFRSR; Harrison et al., 1994)and the microwave radiometer (MWR; Liljegren, 1994) are mainstays in the Atmospheric Radiation Measurement (ARM) Program's suite of radiometric instrumentation. The MFRSR measures direct normal radiation, diffuse radiation, and total radiation at six distinct wavelengths (415 nm, 500 nm, 615 nm, 673 nm, 870nm, and 940 nm) with a passband of about 10 nm. Additionally, broadband shortwave radiation is measured using a silicon photodiode. From the MFRSR measurements one can derive a wealth of information regarding the optical state of the atmosphere including aerosol and cloud optical depths. From the MWR one can measure columnar water vapor and liquid water path (LWP). When the MFRSR measurements are combined with those from the MWR, it becomes possible to calculate the cloud droplet effective radius as well. The MWR and MFRSR were deployed at the SHEBA ice camp from October 1997 until October 1998. (SHEBA stands for Surface Heat Budget of the Arctic Ocean, see http://sheba.apLwahsington.edu) Since early 1998 an MWR and an MFRSR have also been 'deployed at the ARM Barrow site. The presence of these instruments in the Arctic presents a unique opportunity to investigate the spatial and temporal distribution of aerosol and cloud optical depth as well as evaluate the performance of these instruments in the inhospitable arctic environment. In this paper we discuss some of the issues associated with instrument deployment in the arctic environment as well as some preliminary results derived from measurements taken at the two sites.

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