TY - JOUR
T1 - Linear relation between convective cloud base height and updrafts and application to satellite retrievals
AU - Zheng, Youtong
AU - Rosenfeld, Daniel
N1 - Publisher Copyright:
©2015. American Geophysical Union. All Rights Reserved.
PY - 2015/8/16
Y1 - 2015/8/16
N2 - Measurements done by the Department of Energy/Atmospheric Radiation Measurement program, at the Southern Great Plains, the central Amazon, and on board an oceangoing ship between Honolulu and Los Angeles, show that updraft speeds measured by Doppler lidar and 95 GHz cloud radar are tightly linearly correlated with cloud base height (Hb). Based on these relationships, a method of satellite retrieval of maximum (Wmax) and cloud base (Wb) updraft speeds in cloud topped planetary boundary layer is proposed. Hb, as an input for updraft estimation, is obtained from satellite-retrieved cloud base temperature in combination with 2 m air temperature derived from European Centre for Medium-Range Weather Forecasts reanalysis. Validation by the lidar and radar measurements shows good agreements for the satellite retrieval of Wmax with RMSE (root-mean-square error) = 0.38 m/s and MAPE (mean absolute percentage error) = 19% and Wb with RMSE = 0.34 m/s and MAPE = 21%.
AB - Measurements done by the Department of Energy/Atmospheric Radiation Measurement program, at the Southern Great Plains, the central Amazon, and on board an oceangoing ship between Honolulu and Los Angeles, show that updraft speeds measured by Doppler lidar and 95 GHz cloud radar are tightly linearly correlated with cloud base height (Hb). Based on these relationships, a method of satellite retrieval of maximum (Wmax) and cloud base (Wb) updraft speeds in cloud topped planetary boundary layer is proposed. Hb, as an input for updraft estimation, is obtained from satellite-retrieved cloud base temperature in combination with 2 m air temperature derived from European Centre for Medium-Range Weather Forecasts reanalysis. Validation by the lidar and radar measurements shows good agreements for the satellite retrieval of Wmax with RMSE (root-mean-square error) = 0.38 m/s and MAPE (mean absolute percentage error) = 19% and Wb with RMSE = 0.34 m/s and MAPE = 21%.
KW - cloud base updrafts
KW - satellite retrieval
UR - http://www.scopus.com/inward/record.url?scp=84940447702&partnerID=8YFLogxK
U2 - 10.1002/2015GL064809
DO - 10.1002/2015GL064809
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AN - SCOPUS:84940447702
SN - 0094-8276
VL - 42
SP - 6485
EP - 6491
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 15
ER -