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    <dct:description>The Climate Data Records (CDR) for Channel 9 contains Radio Occulation (RO) calibrated brightness temperatures from AMSU-A channel 9 measurements at 57.3 GHz from 2001 through present on a 2.5 degree grid. Data are partitioned into yearly files with monthly variables, where each file contains RO-calibrated channel 9 brightness temperatures from AMSU-A measurements from NOAA-15, 16, 17, 18, 19, NASA AQUA and Metop-A. the NOAA archive of the Level 1b AMSU dataset, and the NASA DAAC archive of the Aqua Level 1B dataset.
The RO satellites measure the bending angle of GPS signals as they pass through the atmosphere. Temperature profiles are derived from these GPS bending angles from the COSMIC and CHAMP data from 2001 through present. Calibration coefficients are calculated from coincident measurements of AMSU channel 9 brightness temperatures and corresponding values derived from an AMSU forward model applied to temperature profile measurements from RO temperature profiles.  The calibrated AMSU measurements are then combined into gridded monthly values. From these the climatology is calculated using 12 years of data. Anomaly values are then obtained by subtracting this climatology from the monthly values.</dct:description>
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        <dcat:keyword>metop-a</dcat:keyword>
        <dcat:keyword>cosmic data analysis and archive center</dcat:keyword>
        <dcat:keyword>constellation observing system for meteorology</dcat:keyword>
        <dcat:keyword>ionosphere and climate</dcat:keyword>
        <dcat:keyword>university corporation for atmospheric research</dcat:keyword>
        <dcat:keyword>brightness temperature</dcat:keyword>
        <dcat:keyword>infrared wavelengths</dcat:keyword>
        <dcat:keyword>national climatic data center</dcat:keyword>
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        <dcat:keyword>national oceanic &amp; atmospheric administration-15</dcat:keyword>
        <dcat:keyword>national oceanic &amp; atmospheric administration-17</dcat:keyword>
        <dcat:keyword>national oceanic &amp; atmospheric administration-16</dcat:keyword>
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        <dcat:keyword>ucar/cosmic/cdaac</dcat:keyword>
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               <dct:title>Calibration of Temperature in the Lower Stratosphere from Microwave Measurements Using COSMIC Radio Occultation Data: Preliminary Results</dct:title>
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            <rdf:value>["Use Constraints: NCDC cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NCDC makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty. NCDC can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCDC archives.", "Users must cite this dataset as: Ho, S.-P., M. Goldberg, Y.-H. Kuo, C.-Z Zou, W. Schreiner, and the NOAA CDR Program (2013): NOAA Climate Data Record (CDR) of GPS Radio Occulation (RO) Calibrated Advanced Microwave Sounding Unit A (AMSU-A) Channel 9 Monthly Brightness Temperature Anomalies, Version 1.1. [Indicate subset used]. NOAA National Climatic Data Center. [access date].", "Publications using this dataset should also reference the following journal article: Ho, S.-P., M. Goldberg, Y.-H. Kuo, C.-Z Zou, W. Schreiner, Calibration of Temperature in the Lower Stratosphere from Microwave Measurements using COSMIC Radio Occultation Data: Preliminary Results, Terr. Atmos. Oceanic Sci., Vol. 20, doi: 10.3319/TAO.2007.12.06.01(F3C), 2009."]</rdf:value>
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