Surface Radiation, Cloud Effects, and Cloud Properties: Flux Analysis from TWP-ICE
| Long, Chuck | Pacific Northwest National Laboratory |
| Tapper, Nigel | Monash University |
| Atkinson, Brad | Bureau of Meteorology |
| Beringer, Jason | Monash University |
| Mather, James | Pacific Northwest National Laboratory |
Category: Radiation
Surface data collected during TWP-ICE includes radiation/met measurements at six remote sites, as well as those at the ARM Darwin central Facility. Five of these remote sites include not only unshaded broadband hemispheric shortwave (SW) and longwave (LW) instruments, but also a multi-detector SW radiometer designed to simultaneously measure both the downwelling diffuse and total SW components. Having the SW component measurements, as well as the corresponding meteorological variables, allows the Flux Analysis methodology (Long and Ackerman, 2000; Long and Gaustad, 2004; Long, 2004; Long et al., 2005; Long 2005) to be applied at these sites. In the Flux Analysis methodology, continuous estimations of the clear (i.e. cloudless) sky surface SW and LW lead to retrievals of such parameters as downwelling and upwelling cloud effects and net surface cloud forcing, cloud field effective transmissivity and visible optical depth, cloud field effective radiating temperature, and SW and LW (effective) fractional sky cover. We will present preliminary results for TWP-ICE, including climatologies and comparisons on varying time scales, and corresponding studies on spatial and temporal variability of the retrieved parameters.
References:
Long, C. N. and T. P. Ackerman, (2000): Identification of Clear Skies from Broadband Pyranometer Measurements and Calculation of Downwelling Shortwave Cloud Effects, JGR, 105, No. D12, 15609-15626.
Long, C. N. and K. L. Gaustad, (2001, Rev. 2004): The Shortwave (SW) Clear-Sky Detection and Fitting Algorithm: Algorithm Operational Details and Explanations, Atmospheric Radiation Measurement Program Technical Report, ARM TR-004, Available via http://www.arm.gov/publications/techreports.stm.
Long, C. N., (2004): The Next Generation Flux Analysis: Adding Clear-sky LW and LW Cloud Effects, Cloud Optical Depths, and Improved Sky Cover Estimates, 14th ARM Science Team Meeting Proceedings, Albuquerque, New Mexico, March 22-26, 2004.
Long, C. N., J. C. Barnard, J. Calbo, and T. P. Ackerman, (2005): Using Integrated Surface Radiation Measurements to Infer Cloud Properties, AMS Ninth Symposium on Integrated Observing and Assimilation Systems for Atmosphere, Oceans, and Land Surface (IOAS-AOLS), 9–13 January 2005, San Diego, California.
Long, C. N., (2005): On the Estimation of Clear-Sky Upwelling SW and LW, 15th ARM Science Team Meeting Proceedings, Daytona Beach, Florida, March 14-18, 2005.
This poster will be displayed at the ARM Science Team Meeting.
