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Title: Two-channel microwave radiometer for observations of total column precipitable water vapor and cloud liquid water path

Abstract

The Atmospheric Radiation Measurement (ARM) Program is focused on improving the treatment of radiation transfer in models of the atmospheric general circulation, as well as on improving parameterizations of cloud properties and formation processes in these models (USDOE, 1990). To help achieve these objectives, ARM is deploying several two-channel, microwave radiometers at the Cloud and Radiation Testbed (CART) site in Oklahoma for the purpose of obtaining long time series observations of total precipitable water vapor (PWV) and cloud liquid water path (LWP). The performance of the WVR-1100 microwave radiometer deployed by ARM at the Oklahoma CART site central facility to provide time series measurements precipitable water vapor (PWV) and liquid water path (LWP) has been presented. The instrument has proven to be durable and reliable in continuous field operation since June, 1992. The accuracy of the PWV has been demonstrated to achieve the limiting accuracy of the statistical retrieval under clear sky conditions, degrading with increasing LWP. Improvements are planned to address moisture accumulation on the Teflon window, as well as to identity the presence of clouds with LWP at or below the retrieval uncertainty.

Authors:
Publication Date:
Research Org.:
Pacific Northwest Lab., Richland, WA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10128996
Report Number(s):
PNL-SA-22773; CONF-940131-4
ON: DE94007480
DOE Contract Number:  
AC06-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: 5. annual symposium on global change studies,Nashville, TN (United States),24-28 Jan 1994; Other Information: PBD: Jan 1994
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 47 OTHER INSTRUMENTATION; CLOUDS; RADIANT HEAT TRANSFER; REMOTE SENSING; RADIOMETERS; PERFORMANCE; ATMOSPHERIC PRECIPITATIONS; CONDENSATION NUCLEI; OPTICAL PROPERTIES; MOISTURE; GENERAL CIRCULATION MODELS; MICROWAVE EQUIPMENT; ATMOSPHERIC CIRCULATION; 540110; 440800; BASIC STUDIES; MISCELLANEOUS INSTRUMENTATION

Citation Formats

Liljegren, J C. Two-channel microwave radiometer for observations of total column precipitable water vapor and cloud liquid water path. United States: N. p., 1994. Web.
Liljegren, J C. Two-channel microwave radiometer for observations of total column precipitable water vapor and cloud liquid water path. United States.
Liljegren, J C. 1994. "Two-channel microwave radiometer for observations of total column precipitable water vapor and cloud liquid water path". United States. https://www.osti.gov/servlets/purl/10128996.
@article{osti_10128996,
title = {Two-channel microwave radiometer for observations of total column precipitable water vapor and cloud liquid water path},
author = {Liljegren, J C},
abstractNote = {The Atmospheric Radiation Measurement (ARM) Program is focused on improving the treatment of radiation transfer in models of the atmospheric general circulation, as well as on improving parameterizations of cloud properties and formation processes in these models (USDOE, 1990). To help achieve these objectives, ARM is deploying several two-channel, microwave radiometers at the Cloud and Radiation Testbed (CART) site in Oklahoma for the purpose of obtaining long time series observations of total precipitable water vapor (PWV) and cloud liquid water path (LWP). The performance of the WVR-1100 microwave radiometer deployed by ARM at the Oklahoma CART site central facility to provide time series measurements precipitable water vapor (PWV) and liquid water path (LWP) has been presented. The instrument has proven to be durable and reliable in continuous field operation since June, 1992. The accuracy of the PWV has been demonstrated to achieve the limiting accuracy of the statistical retrieval under clear sky conditions, degrading with increasing LWP. Improvements are planned to address moisture accumulation on the Teflon window, as well as to identity the presence of clouds with LWP at or below the retrieval uncertainty.},
doi = {},
url = {https://www.osti.gov/biblio/10128996}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {1}
}

Conference:
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