RADFLUXANAL

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radfluxanal: Radiative Flux Analysis

sgpradflux1longc1-c2_opplot1-20140509-0000001The Radiative Flux Analysis VAP estimates clear-sky shortwave (SW) and longwave (LW) surface fluxes. Clear-sky detection and fitting techniques (Long and Ackerman 2000; Long and Turner 2008) are used to identify clear sky periods from broadband radiometers and empirically fit functions.

The SW clear-sky detection technique uses hemispheric, broadband total- and diffuse-shortwave irradiance measurements to identify clear-sky periods using the known characteristics of typical clear-sky irradiance time series. An empirical fitting technique is used to estimate clear-sky shortwave fluxes (Long and Ackerman 2000). The LW clear sky flux estimation technique uses the SW identified daylight clear-sky data to refine the properties needed for 24-hour a day identification of LW clear-sky periods. Once these refined parameters and limits are determined, then additional clear-sky periods are identified and an empirical fitting technique is again used to continuously estimate clear-sky longwave fluxes.

The VAP also uses a technique (Long et al. 2006) to infer average fractional sky cover from SW measurements for solar elevation angles 10° or greater, with an accuracy of about 10% compared to a TSI. Fractional sky cover is also estimated from LW fluxes using a method similar to that described in Durr and Philipona (2004). Other retrieved parameters include cloud optical depth for overcast skies (Barnard et al., 2008), cloud transmissivity, and cloud radiating temperature.

Locations

  • Fixed
  • AMF1
  • AMF2
  • AMF3

Related Publications

2018

Zhang C, S Xie, S Klein, H Ma, S Tang, K Van Weverberg, C Morcrette, and J Petch. 2018. "CAUSES: Diagnosis of the Summertime Warm Bias in CMIP5 Climate Models at the ARM Southern Great Plains Site." Journal of Geophysical Research: Atmospheres, 123(6), doi:10.1002/2017JD027200.
Research Highlight

Van Weverberg K, C Morcrette, J Petch, S Klein, H Ma, C Zhang, S Xie, Q Tang, W Gustafson Jr, Y Qian, L Berg, Y Liu, M Huang, M Ahlgrimm, R Forbes, E Bazile, R Roehrig, J Cole, W Merryfield, W Lee, F Cheruy, L Mellul, Y Wang, K Johnson, and M Thieman. 2018. "CAUSES: Attribution of Surface Radiation Biases in NWP and Climate Models near the U.S. Southern Great Plains." Journal of Geophysical Research: Atmospheres, 123(7), 10.1002/2017JD027188.
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