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Assessment of Bsrn Radiation Records for the Computation of Monthly Means : Volume 3, Issue 5 (18/10/2010)

By Roesch, A.

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Book Id: WPLBN0003986181
Format Type: PDF Article :
File Size: Pages 35
Reproduction Date: 2015

Title: Assessment of Bsrn Radiation Records for the Computation of Monthly Means : Volume 3, Issue 5 (18/10/2010)  
Author: Roesch, A.
Volume: Vol. 3, Issue 5
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2010
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Ohmura, A., Zhang, T., Dutton, E. G., Wild, M., Long, C. N., & Roesch, A. (2010). Assessment of Bsrn Radiation Records for the Computation of Monthly Means : Volume 3, Issue 5 (18/10/2010). Retrieved from http://www.ebooklibrary.org/


Description
Description: Institute for Atmospheric and Climate Science, ETH Zurich, Universitaetsstrasse 16, 8092 Zurich, Switzerland. The integrity of the Baseline Surface Radiation Network (BSRN) radiation monthly averages are assessed by investigating the impact on monthly means due to the frequency of data gaps caused by missing or discarded high time resolution data. The monthly statistics, especially means, are considered to be important and useful values for climate research, model performance evaluations and for assessing the quality of satellite (time- and space-averaged) data products. The study investigates the spread in different algorithms that have been applied for the computation of monthly means from 1-min values.

The paper reveals that the computation of monthly means from 1-min observations distinctly depends on the method utilized to account for the missing data. The intra-method difference generally increases with an increasing fraction of missing data. We found that a substantial fraction of the radiation fluxes observed at BSRN sites is either missing or flagged as questionable. The percentage of missing data is 4.4%, 13.0%, and 6.5% for global radiation, direct shortwave radiation, and downwelling longwave radiation, respectively. Most flagged data in the shortwave are due to nighttime instrumental noise and can reasonably be set to zero after correcting for thermal offsets in the daytime data. The study demonstrates that the handling of flagged data clearly impacts on monthly mean estimates obtained with different methods. We showed that the spread of monthly shortwave fluxes is generally clearly higher than for downwelling longwave radiation.

Overall, BSRN observations provide sufficient accuracy and completeness for reliable estimates of monthly mean values. However, the value of future data could be further increased by reducing the frequency of data gaps and the number of outliers. It is shown that two independent methods for accounting for the diurnal and seasonal variations in the missing data permit consistent monthly means to within less than one Wm−2 in most cases. The authors suggest using a standardized method for the computation of monthly means which addresses diurnal variations in the missing data in order to avoid a mismatch of future published monthly mean radiation fluxes from BSRN.


Summary
Assessment of BSRN radiation records for the computation of monthly means

Excerpt
Dutton, E. G., Nelson, D. W., Stone, R. S., Longenecker, D., Carbaugh, G., Harris, J. M., and J. WendellDye, D.: Decadal variations in surface solar irradiance as observed in a globally remote network, J. Geophys. Res, 111, D19101, doi:10.1029/2005JD006901, 2006.; Gilgen, H., Wild, M., and Ohmura, A.: Global Energy Balance Archive (GEBA). Report 3: The GEBA Version 1995 Database, Z{ü}rcher Geographische Schriften No. 52, ETH Z{ü}rich, 1997.; Gilgen, H., Roesch, A., Wild, M., and Ohmura, A.: Decadal changes in shortwave irradiance at the surface in the period from 1960 to 2000 estimated from Global Energy Balance Archive Data, J. Geophys. Res., 14, D00D08, doi:10.1029/2008JD011383, 2009.; Haeffelin, M., Kato, S., Smith, A., Rutledge, K., Charlock, T., and Mahan, J.: Determination of the thermal offset of the Eppley Precision Spectral Pyranometer, Appl. Optics, 40, 472–484, 2001.; Liepert, B.: Observed reductions of surface solar radiation at sites in the United States and worldwide from 1961 to 1990, Geophy. Res. Lett., 29, doi:10.1029/2002GL014910, 2002.; Long, C. N. and Shi, Y.: The QCRad Value Added Product: Surface Radiation Measurement Quality Control Testing, Including Climatologically Configurable Limits, Tech. Rep. ARM TR-074, 2006.; Ohmura, A., Dutton, E., and Forgan, B.: Baseline Surface Radiation Network (BSRN/WRMC), a new precision radiometry for climate research, B. Am. Meteor. Soc., 29, 2115–2136, 1998.; Ramanathan, V., Crutzen, P., Kiehl, J., and Rosenfeld, D.: Aerosol, climate and the hydrological cycle, Science, 294, 2119–2124, 2001.; Stanhill, G. and Cohen, S.: Global dimming: a review of the evidence for a widespread and significant reduction in global radiation, Agr. Forest Meteorol., 107, 255–278, 2001.; Wild, M.: Shortwave and longwave surface radiation budgets in GCMs: a review based on the IPCC-AR4/CMIP3 models, Tellus, 60, 932–954, doi:10.1111/j.1600–0870.2008.00342.x, 2008.; Wild, M.: Global dimming and brightening: A review, J. Geophys. Res., 114, doi:10.1029/2008JD011470, 2009.; Wild, M., Ohmura, A., Gilgen, H., and Roeckner, E.: Validation of GCM simulated radiative fluxes using surface observations, J. Climate, 8, 1309–1324, 1995.; Wild, M., Gilgen, H., Roesch, A., Ohmura, A., Long, C., Dutton, E., Forgan, B., Kallis, A., Russak, V., and Tsvetkov, A.: From Dimming to Brightening: Decadal Changes in Solar Radiation at Earth's surface, Science, 308, doi:10.1126/science.1103215, 2005.

 

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