Atmospheric longwave irradiance uncertainty: Pyrgeometers compared to an absolute sky‐scanning radiometer, atmospheric emitted radiance interferometer, and radiative transfer model calculations

Philipona, Rolf; Dutton, Ellsworth G; Stoffel, T.; Michalsky, J.J.; Reda, Ibrahim; Stifter, A.; Wendung, Peter; Wood, Norman B.; Clough, S. A.; Mlawer, E. J.; Anderson, Gail P.; Revercomb, Henry E.; Shippert, Timothy

doi:10.1029/2000jd000196

Cited by 101 publications

(88 citation statements)

References 13 publications

(5 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Hatzianastassiou et al (2005), based on their global satellite-derived surface radiation product validated against GEBA data, provided additional evidence for a lower downward shortwave radiation than commonly assumed, in line with the findings of the GEBA-based global energy balance studies mentioned above. A detailed assessment of their radiation scheme compared to GEBA data over the Mediterranean area was performed by Papadimas et al (2012) and Pyrina et al (2015). Hatzianastassiou et al (2012) further noted that the trends in their surface shortwave radiation product are in reasonable agreement with the GEBA records.…”

Section: Validation Of Surface Energy Fluxes From Climate Models Reamentioning

confidence: 90%

“…Diffuse shortwave radiation measurements are obtained by shading the pyranometers from the direct solar beam, with an instantaneous accuracy of 2-4 W m −2 under ideal conditions (Michalsky et al, 2007). The instantaneous accuracy of downward longwave radiation measurements carried out with pyrgeometers is near 3-4 W m −2 under ideal conditions (Philipona et al, 2001;Marty et al, 2003;Wang and Dickinson, 2013b). No assessments of the accuracy of the nonradiative fluxes on monthly timescales as stored in GEBA are available.…”

Section: Content and Data Sources Of Gebamentioning

confidence: 99%

See 1 more Smart Citation

The Global Energy Balance Archive (GEBA) version 2017: a database for worldwide measured surface energy fluxes

Wild

Ohmura

Schär

et al. 2017

Earth Syst. Sci. Data

110

View full text Add to dashboard Cite

Abstract. The Global Energy Balance Archive (GEBA) is a database for the central storage of the worldwide measured energy fluxes at the Earth's surface, maintained at ETH Zurich (Switzerland). This paper documents the status of the GEBA version 2017 dataset, presents the new web interface and user access, and reviews the scientific impact that GEBA data had in various applications. GEBA has continuously been expanded and updated and contains in its 2017 version around 500 000 monthly mean entries of various surface energy balance components measured at 2500 locations. The database contains observations from 15 surface energy flux components, with the most widely measured quantity available in GEBA being the shortwave radiation incident at the Earth's surface (global radiation). Many of the historic records extend over several decades. GEBA contains monthly data from a variety of sources, namely from the World Radiation Data Centre (WRDC) in St. Petersburg, from national weather services, from different research networks (BSRN, ARM, SURFRAD), from peer-reviewed publications, project and data reports, and from personal communications. Quality checks are applied to test for gross errors in the dataset. GEBA has played a key role in various research applications, such as in the quantification of the global energy balance, in the discussion of the anomalous atmospheric shortwave absorption, and in the detection of multi-decadal variations in global radiation, known as "global dimming" and "brightening". GEBA is further extensively used for the evaluation of climate models and satellite-derived surface flux products. On a more applied level, GEBA provides the basis for engineering applications in the context of solar power generation, water management, agricultural production and tourism. GEBA is publicly accessible through the internet via http://www.geba.ethz.ch. Supplementary data are available at https://doi.org/10.1594/PANGAEA.873078.

show abstract

Section: Validation Of Surface Energy Fluxes From Climate Models Reamentioning

confidence: 90%

Section: Content and Data Sources Of Gebamentioning

confidence: 99%

The Global Energy Balance Archive (GEBA) version 2017: a database for worldwide measured surface energy fluxes

Wild

Ohmura

Schär

et al. 2017

Earth Syst. Sci. Data

110

View full text Add to dashboard Cite

show abstract

“…Therefore, the uncertainty of groundbased longwave radiation measurements will affect the T sfc and H estimates. The sensitivity of T sfc and H to measurement uncertainties is tested by artificially adding 1%, 2%, and 4% error to the longwave radiation during the daytime (0900-1800 local time), which corresponds to measurements with low, medium, and high uncertainty according Philipona et al (2001) and Kohsiek et al (2007). The monsoon period (1-30 September 2009) is taken as an example for the sensitivity test and the three error levels results in a T sfc uncertainty of 0.29, 0.59, and 1.18 K during the daytime, respectively.…”

Section: A Ground Surface Temperature Uncertainty and Its Impactmentioning

confidence: 99%

Assessment of Roughness Length Schemes Implemented within the Noah Land Surface Model for High-Altitude Regions

Zheng

Velde

et al. 2014

Journal of Hydrometeorology

View full text Add to dashboard Cite

Current land surface models still have difficulties with producing reliable surface heat fluxes and skin temperature (T sfc ) estimates for high-altitude regions, which may be addressed via adequate parameterization of the roughness lengths for momentum (z 0m ) and heat (z 0h ) transfer. In this study, the performance of various z 0h and z 0m schemes developed for the Noah land surface model is assessed for a high-altitude site (3430 m) on the northeastern part of the Tibetan Plateau. Based on the in situ surface heat fluxes and profile measurements of wind and temperature, monthly variations of z 0m and diurnal variations of z 0h are derived through application of the Monin-Obukhov similarity theory. These derived values together with the measured heat fluxes are utilized to assess the performance of those z 0m and z 0h schemes for different seasons. The analyses show that the z 0m dynamics are related to vegetation dynamics and soil water freeze-thaw state, which are reproduced satisfactorily with current z 0m schemes. Further, it is demonstrated that the heat flux simulations are very sensitive to the diurnal variations of z 0h . The newly developed z 0h schemes all capture, at least over the sparse vegetated surfaces during the winter season, the observed diurnal variability much better than the original one. It should, however, be noted that for the dense vegetated surfaces during the spring and monsoon seasons, not all newly developed schemes perform consistently better than the original one. With the most promising schemes, the Noah simulated sensible heat flux, latent heat flux, T sfc , and soil temperature improved for the monsoon season by about 29%, 79%, 75%, and 81%, respectively. In addition, the impact of T sfc calculation and energy balance closure associated with measurement uncertainties on the above findings are discussed, and the selection of the appropriate z 0h scheme for applications is addressed.

show abstract

“…The pyrgeometer performance is quantified by the absolute calibration accuracy, measurement stability, angular response, dome spectral transmissivity, direct solar heating and dome temperature effects (e.g., Philipona et al, 1995Philipona et al, , 2001Wendisch and Brenguier, 2013;Gröbner et al, 2014). For a modified Eppley Precision Infrared Radiometer (PIR), Philipona et al (2001) quantified daytime and nighttime precision with 0.4 % (±1 W m −2 ) at night and 1 % (±2 W m −2 ) at day.…”

Section: Introductionmentioning

confidence: 99%

Reconstruction of high-resolution time series from slow-response broadband terrestrial irradiance measurements by deconvolution

Ehrlich

Wendisch

2015

Atmos. Meas. Tech.

View full text Add to dashboard Cite

Abstract. Broadband solar and terrestrial irradiance measurements of high temporal resolution are needed to study inhomogeneous clouds or surfaces and to derive vertical profiles of heating/cooling rates at cloud top. An efficient method to enhance the temporal resolution of slow-response measurements of broadband terrestrial irradiance using pyrgeometer is introduced. It is based on the deconvolution theorem of Fourier transform to restore amplitude and phase shift of high frequent fluctuations. It is shown that the quality of reconstruction depends on the instrument noise, the pyrgeometer response time and the frequency of the oscillations.The method is tested in laboratory measurements for synthetic time series including a boxcar function and periodic oscillations using a CGR-4 pyrgeometer with response time of 3 s. The originally slow-response pyrgeometer data were reconstructed to higher resolution and compared to the predefined synthetic time series. The reconstruction of the time series worked up to oscillations of 0.5 Hz frequency and 2 W m −2 amplitude if the sampling frequency of the data acquisition is 16 kHz or higher. For oscillations faster than 2 Hz, the instrument noise exceeded the reduced amplitude of the oscillations in the measurements and the reconstruction failed.The method was applied to airborne measurements of upward terrestrial irradiance from the VERDI (Vertical Distribution of Ice in Arctic Clouds) field campaign. Pyrgeometer data above open leads in sea ice and a broken cloud field were reconstructed and compared to KT19 infrared thermometer data. The reconstruction of amplitude and phase shift of the deconvoluted data improved the agreement with the KT19 data. Cloud top temperatures were improved by up to 1 K above broken clouds of 80-800 m size (1-10 s flight time) while an underestimation of 2.5 W m −2 was found for the upward irradiance over small leads of about 600 m diameter (10 s flight time) when using the slow-response data. The limitations of the method with respect to instrument noise and digitalization of measurements by the data acquisition are discussed.

show abstract

Atmospheric longwave irradiance uncertainty: Pyrgeometers compared to an absolute sky‐scanning radiometer, atmospheric emitted radiance interferometer, and radiative transfer model calculations

Cited by 101 publications

References 13 publications

The Global Energy Balance Archive (GEBA) version 2017: a database for worldwide measured surface energy fluxes

The Global Energy Balance Archive (GEBA) version 2017: a database for worldwide measured surface energy fluxes

Assessment of Roughness Length Schemes Implemented within the Noah Land Surface Model for High-Altitude Regions

Reconstruction of high-resolution time series from slow-response broadband terrestrial irradiance measurements by deconvolution

Contact Info

Product

Resources

About