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In order to meet the urgent requirement for accurate retrieval of liquid cloud microphysical properties, integrating the detecting advantages of active and passive sensors and combining radar reflectivity and optical depth information from CloudSat and Aqua, a new retrieval algorithm of liquid cloud microphysical parameters is proposed according to the optimal estimation theory. By assuming the lognormal size distribution of cloud droplets and establishing functional relationships between measurement and retrieval variables based on forward physical model, with the prior information about spectral distribution parameters, the optimal solutions of spectral parameters are obtained after iteratively calculating, then the microphysical parameters of liquid cloud could be retrieved based on forward physical model, and the uncertainty can be calculated according to error propagation theory. By designing retrieval scheme and using measured case data, the retrieval results are compared with the data published by CloudSat official institutions and those retrieved using empirical algorithms, showing that retrievals of liqiud cloud microphysical parameters based on optimal estimation theory by using combined active and passive sensor data are well consistent with official released data, which makes up for the disadvantages of empirical algorithms that have large error and poor expansibility and gives some important references for retrieval research of liquid cloud microphysical parameters based on domestic spaceborne and airborne W-band millimeter-wave radar data.
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Keywords:
- CloudSat /
- Aqua /
- liquid cloud /
- optimal estimation theory
[1] Cui X P, Li X F 2011 Chin. Phys. B 20 109201
[2] Stephen G L 2005 J. Climate 18 237
[3] Cheng T H, Gu X F, Chen L F, Yu T, Tian G L 2008 Acta Phys. Sin. 57 5323 (in Chinese) [程天海, 顾行发, 陈良富, 余涛, 田国良 2008 57 5323]
[4] Xie X N, Liu X D 2010 Chin. Phys. B 19 109201
[5] Wang K, Feng G L, Sun S P, Zheng Z H 2012 Acta Phys. Sin. 61 109201 (in Chinese) [王阔, 封国林, 孙树鹏, 郑志海 2012 61 109201]
[6] Atlas D 1954 J. Meteor. 11 309
[7] Sauvageot H, Omar J 1987 J. Atmos. Oceanic Technol. 4 264
[8] Sassen K, Liao L 1996 J. Appl. Meteor. 35 932
[9] Fox N I, Illingworth A J 1997 J. Appl. Meteor. 36 485
[10] Baedi R J P, de Wit J J M, Russchenberg H W J, Erkelens J S, Poiares Baptista J P V 2000 Phys. Chem. Earth B 25 1057
[11] Krasnov O A, Russchenberg H W J 2002 Proceedings of the 11th Conference on Cloud Physics Ogden, USA, June 2-7, 2002 p218
[12] Shupe M D, Uttal T, Matrosov S Y 2005 J. Appl. Meteor. 44 1544
[13] Rodgers C D 2000 Inverse Methods for Atmospheric Sounding: Theory and Practice (River Edge: World Scientific Publishing Co., Inc.) pp81-99
[14] Hansen J E 1971 J. Atmos. Sci. 28 1400
[15] Nakajima T, King M D 1990 J. Atmos. Sci. 47 1878
[16] Miles N L, Verlinde J, Clothiaux E E 2000 J. Atmos. Sci. 57 295
[17] Austin R T, Stephens G L 2001 J. Geophys. Res. 106 28233
[18] van de Hulst H C 1957 Light Scattering by Small Particles (New York: John Wiley & Sons, Inc.) pp63-81
[19] Marks C J, Rodgers C D 1993 J. Geophys. Res. 98 14939
[20] Rodgers C D 1990 J. Geophys. Res. 95 5587
[21] Krasnov O A, Russchenberg H W J 2005 Proceedings of the 32nd Conference on Radar Meteorology Albuquerque, USA, October 22-29, 2005 p117
[22] Yan W, Ren J Q, Lu W, Wu X 2011 J. Infrared Millim. Waves 30 158 (in Chinese) [严卫, 任建奇, 陆文, 吴限 2011 红外与毫米波学报 30 158]
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[1] Cui X P, Li X F 2011 Chin. Phys. B 20 109201
[2] Stephen G L 2005 J. Climate 18 237
[3] Cheng T H, Gu X F, Chen L F, Yu T, Tian G L 2008 Acta Phys. Sin. 57 5323 (in Chinese) [程天海, 顾行发, 陈良富, 余涛, 田国良 2008 57 5323]
[4] Xie X N, Liu X D 2010 Chin. Phys. B 19 109201
[5] Wang K, Feng G L, Sun S P, Zheng Z H 2012 Acta Phys. Sin. 61 109201 (in Chinese) [王阔, 封国林, 孙树鹏, 郑志海 2012 61 109201]
[6] Atlas D 1954 J. Meteor. 11 309
[7] Sauvageot H, Omar J 1987 J. Atmos. Oceanic Technol. 4 264
[8] Sassen K, Liao L 1996 J. Appl. Meteor. 35 932
[9] Fox N I, Illingworth A J 1997 J. Appl. Meteor. 36 485
[10] Baedi R J P, de Wit J J M, Russchenberg H W J, Erkelens J S, Poiares Baptista J P V 2000 Phys. Chem. Earth B 25 1057
[11] Krasnov O A, Russchenberg H W J 2002 Proceedings of the 11th Conference on Cloud Physics Ogden, USA, June 2-7, 2002 p218
[12] Shupe M D, Uttal T, Matrosov S Y 2005 J. Appl. Meteor. 44 1544
[13] Rodgers C D 2000 Inverse Methods for Atmospheric Sounding: Theory and Practice (River Edge: World Scientific Publishing Co., Inc.) pp81-99
[14] Hansen J E 1971 J. Atmos. Sci. 28 1400
[15] Nakajima T, King M D 1990 J. Atmos. Sci. 47 1878
[16] Miles N L, Verlinde J, Clothiaux E E 2000 J. Atmos. Sci. 57 295
[17] Austin R T, Stephens G L 2001 J. Geophys. Res. 106 28233
[18] van de Hulst H C 1957 Light Scattering by Small Particles (New York: John Wiley & Sons, Inc.) pp63-81
[19] Marks C J, Rodgers C D 1993 J. Geophys. Res. 98 14939
[20] Rodgers C D 1990 J. Geophys. Res. 95 5587
[21] Krasnov O A, Russchenberg H W J 2005 Proceedings of the 32nd Conference on Radar Meteorology Albuquerque, USA, October 22-29, 2005 p117
[22] Yan W, Ren J Q, Lu W, Wu X 2011 J. Infrared Millim. Waves 30 158 (in Chinese) [严卫, 任建奇, 陆文, 吴限 2011 红外与毫米波学报 30 158]
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