Comparison of surface radiative flux parameterizations - Part II: Longwave Radiation Export

@article{citeulike:820074, abstract = {This paper presents a comparison of several longwave (LW) downwelling radiative flux parameterizations with hourly averaged pointwise surface-radiation observations made at Sodankyla, Finland, in 1997 and 1999. Both clear and cloudy nighttime conditions are considered. The comparisons covered a 2-m temperature range from +11oC all the way to -49oC.The clear-sky comparisons included eight simple LW parameterizations, which mainly use screen-level input data, and four radiation schemes from numerical weather prediction (NWP) models: the former European Centre for Medium-Range Weather Forecast (ECMWF) scheme, the Deutscher Wetterdienst (DWD) scheme, the High Resolution Limited Area Model (HIRLAM) scheme, and the new ECMWF LW scheme (Rapid Radiative Transfer Model, RRTM). Atmospheric-sounding profiles were used as input for the NWP schemes. For the cases with clouds, three simple cloud-correction methods were tested.Almost all LW schemes usually underestimated the downwelling clear-sky flux, particularly, in cold (surface inversion) conditions. Overall, the RRTM scheme performed best. The simple cloud-correction methods turned out to be useful in the LW region. Finally, some new simple parameterization formulas were developed using the present data.}, author = {Niemela, S. and Raisanen, P. and Savijarvi, H.}, citeulike-article-id = {820074}, citeulike-linkout-0 = {http://www.ingentaconnect.com/content/els/01698095/2001/00000058/00000001/art00084}, journal = {Atmospheric Research}, keywords = {radiation, shortwave}, month = {June}, number = {2001}, pages = {1--18}, posted-at = {2006-08-28 18:54:12}, priority = {2}, title = {Comparison of surface radiative flux parameterizations - Part II: Longwave Radiation}, url = {http://www.ingentaconnect.com/content/els/01698095/2001/00000058/00000001/art00084}, volume = {58} }

TY - JOUR ID - citeulike:820074 L3 - citeulike-article-id:820074 N2 - This paper presents a comparison of several longwave (LW) downwelling radiative flux parameterizations with hourly averaged pointwise surface-radiation observations made at Sodankyla, Finland, in 1997 and 1999. Both clear and cloudy nighttime conditions are considered. The comparisons covered a 2-m temperature range from +11oC all the way to -49oC.The clear-sky comparisons included eight simple LW parameterizations, which mainly use screen-level input data, and four radiation schemes from numerical weather prediction (NWP) models: the former European Centre for Medium-Range Weather Forecast (ECMWF) scheme, the Deutscher Wetterdienst (DWD) scheme, the High Resolution Limited Area Model (HIRLAM) scheme, and the new ECMWF LW scheme (Rapid Radiative Transfer Model, RRTM). Atmospheric-sounding profiles were used as input for the NWP schemes. For the cases with clouds, three simple cloud-correction methods were tested.Almost all LW schemes usually underestimated the downwelling clear-sky flux, particularly, in cold (surface inversion) conditions. Overall, the RRTM scheme performed best. The simple cloud-correction methods turned out to be useful in the LW region. Finally, some new simple parameterization formulas were developed using the present data. IS - 2001 JF - Atmospheric Research EP - 18 TI - Comparison of surface radiative flux parameterizations - Part II: Longwave Radiation VL - 58 SP - 1 KW - radiation KW - shortwave AU - Niemela, S AU - Raisanen, P AU - Savijarvi, H UR - http://www.ingentaconnect.com/content/els/01698095/2001/00000058/00000001/art00084 ER -