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Assessing the Potential of Passive Microwave Radiometers for Continuous Temperature Profile Retrieval Using a Three Year Data Set from Payerne : Volume 4, Issue 6 (13/12/2011)

By Löhnert, U.

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Book Id: WPLBN0003975223
Format Type: PDF Article :
File Size: Pages 35
Reproduction Date: 2015

Title: Assessing the Potential of Passive Microwave Radiometers for Continuous Temperature Profile Retrieval Using a Three Year Data Set from Payerne : Volume 4, Issue 6 (13/12/2011)  
Author: Löhnert, U.
Volume: Vol. 4, Issue 6
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2011
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Maier, O., & Löhnert, U. (2011). Assessing the Potential of Passive Microwave Radiometers for Continuous Temperature Profile Retrieval Using a Three Year Data Set from Payerne : Volume 4, Issue 6 (13/12/2011). Retrieved from http://www.ebooklibrary.org/


Description
Description: Institute for Geophysics and Meteorology, University of Cologne, Zülpicher Straße 49a, 50674 Köln, Germany. The motivation of this study is to verify theoretical expectations placed on ground-based radiometer techniques and to confirm whether they are suitable for supporting key missions of national weather services, such as timely and accurate weather advisories and warnings. We evaluate reliability and accuracy of atmospheric temperature profiles retrieved continuously by a HATPRO (Humidity And Temperature PROfiler) system operated at the aerological station of Payerne (MeteoSwiss) in the time period August 2006–December 2009. Assessment is performed by comparing temperatures from the radiometer against temperature measurements from a radiosonde accounting for a total of 2088 quality-controlled all-season cases.

In the evaluated time period, HATPRO delivered reliable temperature profiles in 88% of all-weather conditions with a temporal resolution of 15 min. Random differences between HATPRO and radiosonde are down to 0.5 K in the lower boundary layer and rise up to 1.7 K at 4 km height. The differences observed between HATPRO and radiosonde in the lower boundary layer are similar to the differences observed between the radiosonde and another in-situ sensor located on a close-by 30 m tower. Temperature retrievals from above 4 km contain less than 5% of the total information content of the measurements, which makes clear that this technique is mainly suited for continuous observations in the boundary layer. Systematic temperature differences are also observed throughout the retrieved profile and can account for up to ±0.5 K. These errors are due to offsets in the measurements of the microwave radiances that have been corrected for in data post-processing and lead to nearly bias-free overall temperature retrievals. Different reasons for the radiance offsets are discussed, but cannot be unambiguously determined retrospectively. Monitoring and, if necessary, corrections for radiance offsets as well as a real-time rigorous automated data quality control are mandatory for microwave profiler systems that are designated for operational temperature profiling. In the analysis of day/night differences, it is shown that systematic differences between radiosonde and HATPRO decrease throughout the boundary layer if 2 m surface temperature measurements are included in the retrieval.


Summary
Assessing the potential of passive microwave radiometers for continuous temperature profile retrieval using a three year data set from Payerne

Excerpt
Cadeddu, M. P., Payne, V. H., Clough, S. A., Cady-Pereira, K., and Liljegren, J. C.: Effect of the Oxygen Line-Parameter Modeling on Temperature and Humidity Retrievals From Ground-Based Microwave Radiometers, IEEE T. Geosci. Remote, 45(7), 2216–2222, 2007.; Calpini, B., Ruffieux, D., Bettems, J.-M., Hug, C., Huguenin, P., Isaak, H.-P., Kaufmann, P., Maier, O., and Steiner, P.: Ground-based remote sensing profiling and numerical weather prediction model to manage nuclear power plants meteorological surveillance in Switzerland, Atmos. Meas. Tech., 4, 1617–1625, doi:10.5194/amt-4-1617-2011, 2011.; Cimini, D., Hewison, T. J., Martin, L., Güldner, J., Gaffard, C., and Marzano, F. S.: Temperature and humidity profile retrievals from groundbased microwave radiometers during TUC, Meteorol. Z., 15(5), 45–56, 2006.; Crewell, S. and Löhnert, U.: Accuracy of boundary layer temperature profiles retrieved with multi-frequency, multi-angle microwave radiometry, IEEE T. Geosci. Remote, 45(7), 2195–2201, doi:10.1109/TGRS.2006.888434, 2007.; Duerr, B. and Philipona, R.: Automatic cloud amount detection by surface longwave downward radiation measurements, J. Geophys. Res., 109, D05201, doi:10.1029/2003JD004182, 2004.; Güldner, J. and Spänkuch, D.: Remote sensing of the thermodynamic state of the atmospheric boundary layer by ground-based microwave radiometry, J. Atmos. Oceanic Technol., 18, 925–933, 2001.; Karstens, U., Simmer, C., and Ruprecht, E.: Remote sensing of cloud liquid water, Meteorol. Atmos. Phys., 54, 157–171, 1994.; Hewison, T. J., Cimini, D., Martin, L., Gaffard, C., and Nash, J.: Validating clear air absorption models using ground-based microwave radiometers and vice-versa, Meteorol. Z., 15(1), 27–36, 2011.; Liljegren, J. C., Boukabara, S. A., Cady-Pereira, K., and Clough, S. A.: The Effect of the half-width of the 22-GHz water vapor line on retrievals of temperature and water vapor profiles with a twelve-channel microwave radiometer, IEEE T. Geosci. Remote, 43, 1102–1108, 2005.; Löhnert, U. and Crewell, S.: Accuraccy of cloud liquid water path from ground-based microwave radiometry. Part I. Dependency on cloud model statistics, Radio Sci., 38(3), 8041, doi:10.1029/2002RS002654, 2003.; Löhnert, U., Turner, D., and Crewell, S.: Ground-based temperature and humidity profiling using spectral infrared and microwave observations: Part 1. Simulated retrieval performance in clear sky conditions, J. Appl. Meteorol., 48(5), 1017–1032, doi:10.1175/2008JAMC2060.1, 2009.; Nörenberg, D., Crewell, S., Löhnert, U., and Rose, T.: Development of Ground Equipment for Atmospheric Propagation Conditions Assessment from 10 up to 90 GHz Frequency Bands (ATPROP) – ESA CONTRACT 19839/06/NL/GLC, Final Report, available through Institute for Geophysics and Meteorology, University of Cologne, Germany, 2008.; Richner, H. and v. Hünerbein, S.: Grundlagen aerologischer Messungen speziell mittels der Schweizer Sonde SRS 400, Ver�ffentlichungen der SMA-MeteoSchweiz Nr. 61, ISSN 1422–1381, available through MeteoSwiss Headquarters, Switzerland, 1999.; Rodgers, C.&n

 

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