Narrow Field of View Zenith Radiometer (NFOV) Handbook

Chiu, C ; Marshak, A ; Hodges, G ; Barnard, JC ; Schmelzer, J

Pacific Northwest National Laboratory

关键词: CLIMATES;    CLOUDS;    MANUALS;    OPTICAL PROPERTIES;    RADIOMETERS;    SAMPLING;    TIME RESOLUTION;    WAVELENGTHS;   

DOI  :  10.2172/1020260
RP-ID  :  DOE/SC-ARM/TR-060
PID  :  OSTI ID: 1020260
Others  :  TRN: US201120%%366

学科分类：环境科学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

The two-channel narrow field-of-view radiometer (NFOV2) is a ground-based radiometer that looks straight up and measures radiance directly above the instrument at wavelengths of 673 and 870 nm. The field-of-view of the instrument is 1.2 degrees, and the sampling time resolution is one second. Measurements of the NFOV2 have been used to retrieve optical properties for overhead clouds that range from patchy to overcast. With a one-second sampling rate of the NFOV2, faster than almost any other ARM Climate Research Facility (ACRF) instrument, we are able, for the first time, to capture changes in cloud optical properties at the natural time scale of cloud evolution.