The Baseline Surface Radiation Network Pyrgeometer Round-Robin Calibration Experiment

Philipona, Rolf; Fröhlich, C.; Dehne, K.; Deluisi, John; Augustine, John; Dutton, Ellsworth G; Nelson, Don; Forgan, Bruce; Novotny, Peter; Hickey, J. R.; Love, Steven P.; Bender, Steven C.; McArthur, Bruce; Ohmura, Atsumu; Seymour, J; Foot, J. S.; Shiobara, Masataka; Valero, Francisco; Strawa, A. W.

doi:10.1175/1520-0426(1998)015<0687:tbsrnp>2.0.co;2

Cited by 43 publications

(32 citation statements)

References 11 publications

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“…Besides the Eppley company (Eplab), there are a number of other institutes that perform infrared calibration. Stimulated by the demand for more accurate measurements, several pyranometer inter-comparisions have been made in the last decade, e.g., Dehne et al (1993) and Philipona et al (1998). The latter authors report on a comparison experiment involving five PIR instruments and eleven laboratories.…”

Section: Discussionmentioning

confidence: 99%

The Energy Balance Experiment EBEX-2000. Part III: Behaviour and quality of the radiation measurements

Kohsiek

Liebethal

Foken

et al. 2006

Boundary-Layer Meteorol

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An important part of the Energy Balance Experiment (EBEX-2000) was the measurement of the net radiation and its components. Since the terrain, an irrigated cotton field, could not be considered homogeneous, radiation measurements were made at nine sites using a variety of radiation instruments, including pyranometers, pyrgeometers and net radiometers. At several of these sites multiple instruments were employed, which enabled us to compare instruments and assess accuracies. At all sites the outgoing longwave and shortwave radiation and the net radiation were measured, while the incoming radiation was supposed to be uniformly distributed over the field and was therefore measured at three sites only. Net radiation was calculated for all sites from the sum of its four components, and compared with the direct measurement of net radiometers. The main conclusions were: (a) the outgoing shortwave radiation showed differences of up to 30 W m −2 over the field; the differences were not clearly related to the irrigation events; (b) the outgoing longwave radiation showed differences of up to 50 W m −2 ; the differences increased during the periods of irrigation; (c) the net radiation showed differences of several tens of W m −2 across the field, rising to 50 W m −2 or more during the periods of irrigation; (d) the net radiation is preferably to be inferred from its four components, rather than measured directly, and (e) attention should be paid to the characteristics of pyranometers that measure the outgoing radiation, and thus are mounted upside down, while they are commonly calibrated in the upward position. The error in the net radiation at EBEX-2000 is estimated at max (25 W m −2 , 5%) per site during the day and 10 W m −2 at night.

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Section: Discussionmentioning

confidence: 99%

The Energy Balance Experiment EBEX-2000. Part III: Behaviour and quality of the radiation measurements

Kohsiek

Liebethal

Foken

et al. 2006

Boundary-Layer Meteorol

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“…[7] Under ideal conditions, the voltage V from a thermopile is linearly related to the net gain of radiant power, and the thermopile sensor surface absorbs and emits as a blackbody at measured temperature T s . An energy balance equation for this perfect thermopile can be written [Philipona et al, 1998]:…”

Section: Pyrgeometers and Their Calibrationmentioning

confidence: 99%

Global atmospheric downward longwave radiation at the surface from ground‐based observations, satellite retrievals, and reanalyses

Wang

Dickinson

2013

Reviews of Geophysics

157

141

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[1] Atmospheric downward longwave radiation at the surface (L d ) varies with increasing CO 2 and other greenhouse gases. This study quantifies the uncertainties of current estimates of global L d at monthly to decadal timescales and its global climatology and trends during the past decades by a synthesis of the existing observations, reanalyses, and satellite products. We find that current L d observations have a standard deviation error of~3.5 W m À2 on a monthly scale. Citation: Wang, K., and R. E. Dickinson (2013), Global atmospheric downward longwave radiation at the surface from ground-based observations, satellite retrievals, and reanalyses, Rev. Geophys., 51, 150-185,

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“…11. The current best estimate for the DLR measurement error is Ϯ10 W m Ϫ2 for the stations in GEBA based on the studies of DeLuisi et al (1992) and Philipona et al (1998), and references therein. The accuracy of DLR measurements according to BSRN standards is now about 2-3 W m Ϫ2 .…”

Section: ) Cloudy-sky and Aerosol Absorptionmentioning

confidence: 99%

Radiative Fluxes in the ECHAM5 General Circulation Model

Wild

Roeckner

2006

Journal of Climate

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Radiative fluxes in the ECHAM5 general circulation model (GCM) are evaluated using both surface and satellite-based observations. The fluxes at the top of the atmosphere (TOA) are generally in good agreement with the satellite data. Larger deviations in simulated cloud forcing are found especially at lower latitudes where the shortwave component within the intertropical convergence zone is overestimated during boreal summer and underestimated in the marine stratocumulus regimes, especially during boreal winter. At the surface the biases in the radiative fluxes are significantly smaller than in earlier versions of the same model and in other GCMs. The shortwave clear-sky fluxes are shown to be in good agreement with newly derived observational estimates. Compared to the preceding model version, ECHAM4, the spurious absorption of solar radiation in the cloudy atmosphere disappears due to the higher resolution in the nearinfrared bands of the shortwave radiation code. This reduces the biases with respect to collocated surface and TOA observations. It is illustrated that remaining biases in atmospheric absorption may be related to the crude aerosol climatology, which does not account for high loadings of absorbing aerosol such as from biomass burning, whereas the biases disappear in areas and seasons where aerosol effects are less important. In the longwave, the introduction of the Rapid Radiative Transfer Model (RRTM) radiation code leads to an increase in the longwave downward flux at the surface at high latitudes, thereby reducing biases typically found in GCMs. The considerable skill in the simulation of the fluxes at the earth's surface underlines the suitability of ECHAM5 as an atmospheric component of an integrated earth system model.

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The Baseline Surface Radiation Network Pyrgeometer Round-Robin Calibration Experiment

Cited by 43 publications

References 11 publications

The Energy Balance Experiment EBEX-2000. Part III: Behaviour and quality of the radiation measurements

The Energy Balance Experiment EBEX-2000. Part III: Behaviour and quality of the radiation measurements

Global atmospheric downward longwave radiation at the surface from ground‐based observations, satellite retrievals, and reanalyses

Radiative Fluxes in the ECHAM5 General Circulation Model

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