ARM Value-Added Product (VAP) Monthly Status Report (March 2007)

Comstock, J ; Flynn, C ; Jensen, M ; Long, C ; Turner, D ; Xie, S

Pacific Northwest National Laboratory

关键词: ABSORPTION;    AEROSOLS;    ALBEDO;    ASYMMETRY;    CLOUDS;    OPTICAL PROPERTIES;    RADIATIONS;    RADIOMETERS;    RESOLUTION;    SAMPLING;    SCATTERING;    SIGNAL-TO-NOISE RATIO;    SPECTROSCOPY;    TARGETS;   

DOI  :  10.2172/1021007
RP-ID  :  DOE/SC-ARM/P-07-005.1
PID  :  OSTI ID: 1021007
Others  :  Other: PNNL-17087
Others  :  TRN: US201120%%406

学科分类：环境科学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

The original temporal resolution of the Atmospheric Radiation Measurement (ARM) AERI instruments was 8 minutes, where each cycle consisted of a 3-minute sky-view period and 2-minute views at each of the two blackbody targets. This sampling strategy was chosen to achieve the desired signal-to-noise ratio for clear-sky spectroscopy and profiling studies. To make the AERI observations more useful for cloud research, the temporal resolution has been decreased by an order of magnitude; however, this greatly increases the random error in these observations. This VAP uses a principle component analysis noise filter to significantly reduce the amount of uncorrelated random error in the AERI observations. The noise-filtered 'rapid-sample' AERI observations have approximately the same amount of random error as the original AERI radiance data. The AEROSOL BE VAP provides temporally and spatially continuous vertical profiles of ambient aerosol optical properties including scattering, absorption, and extinction coefficients, single scattering albedo and asymmetry parameter. It uses a combination of passive radiometers, in-situ surface measurements, empirical relationships, climatologies, and model input. It is a direct input to the BBHRP VAP, an ACRF programmatic metric.