Progress report of FY 1998 activities: Continued development of an integrated sounding system in support of the DOE/ARM experimental program

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Both during September 15-30, 1996 and September 15-October 5, 1997, the Environmental Technology Laboratory (ETL) participated in an experiment at the Southern Great Plains (SGP) Cloud and Radiation Testbed (CART) site that was designed to study many of the ways that ARM is measuring water vapor. These experiments, called the Water Vapor Intensive Operating Periods (WVIOPs), produced some results of significant importance to ARM water vapor measurements. We have spent the major portion of this years activities in analyzing results of these experiments, and improving algorithms for improving the measurement of precipitable water vapor (PWV) from instruments available at ARM. ... continued below

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Westwater, Edgeworth R.; Han, Yong & Leuskiy, Vladimir September 6, 1998.

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Description

Both during September 15-30, 1996 and September 15-October 5, 1997, the Environmental Technology Laboratory (ETL) participated in an experiment at the Southern Great Plains (SGP) Cloud and Radiation Testbed (CART) site that was designed to study many of the ways that ARM is measuring water vapor. These experiments, called the Water Vapor Intensive Operating Periods (WVIOPs), produced some results of significant importance to ARM water vapor measurements. We have spent the major portion of this years activities in analyzing results of these experiments, and improving algorithms for improving the measurement of precipitable water vapor (PWV) from instruments available at ARM. The most important ARM instrument for this measurement continues to be the Microwave Radiometer (MWR). Measurements of water vapor at the North Slope of Alaska and Adjacent Arctic Ocean (NSA/AAO) CART site in Barrow, Alaska, area potential problem because of the difficulty of radiosondes to measure low amounts of vapor during cold and extremely dry conditions. The applicability of MWR scaling to radiosondes is questionable because of the low sensitivity of these instrument during dry conditions. It has been suggested by the ARM Instantaneous Radiative Flux Working Group and others that measurements of brightness temperature around 183 GHz could be used to scale during the coldest and driest periods. However, the millimeter wavelengths are vulnerable to cloud effects from both liquid and ice. We have participated in the planning and will participate in the Millimeter wave Arctic Experiment that will evaluate microwave and millimeter wave radiometers during extremely cold conditions. ETL has tested, both in an experiment at the Boulder Atmospheric Observatory and during the two Water Vapor Intensive Operating Periods in 1996 and 1997, a 5-mm scanning radiometer that measures low-altitude temperature profiles; both profiles of lapse rate and absolute temperature can be measured with the instrument. The technique and algorithms were developed for continental conditions and produced excellent agreement with in situ data. Due ETL recommendations, an instrument of this type was purchased and will be deployed in the NSA. During this year, we have developed algorithms for this instrument in the NSA and to blend the data with other sources of temperature information, such as Radio Acoustic Sounding Systems (RASS). In addition, we conducted an extensive analysis of the data from this instrument, and compared the data with a variety of in situ ground truth.

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Medium: P; Size: vp.

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OSTI as DE00762787

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  • Other Information: PBD: 6 Sep 1998

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  • Report No.: None
  • Grant Number: AI03-94ER61742
  • DOI: 10.2172/762787 | External Link
  • Office of Scientific & Technical Information Report Number: 762787
  • Archival Resource Key: ark:/67531/metadc720486

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • September 6, 1998

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

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  • March 23, 2016, 12:20 p.m.

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Westwater, Edgeworth R.; Han, Yong & Leuskiy, Vladimir. Progress report of FY 1998 activities: Continued development of an integrated sounding system in support of the DOE/ARM experimental program, report, September 6, 1998; United States. (digital.library.unt.edu/ark:/67531/metadc720486/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.