Retrieval of cloud microphysics parameters from spaceborne 94/220GHz dual-frequency cloud radar based on non-spherical ice particles

Qiong WU; Mei-Lin YANG; Hong-Gang YIN; Jian SHANG

doi:10.11972/j.issn.1001-9014.2021.05.006

Journals >Journal of Infrared and Millimeter Waves >Volume 40 >Issue 5 >Page 605 > Article

Journal of Infrared and Millimeter Waves
Vol. 40, Issue 5, 605 (2021)

Retrieval of cloud microphysics parameters from spaceborne 94/220GHz dual-frequency cloud radar based on non-spherical ice particles

Qiong WU¹, Mei-Lin YANG², Hong-Gang YIN¹, and Jian SHANG^1、*

Author Affiliations

¹National Satellite Meteorological Center，Beijing 100081，China

²Institute of Urban Meteorology，China Meteorological Administration，Beijing 100089，China

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DOI: 10.11972/j.issn.1001-9014.2021.05.006 Cite this Article

Qiong WU, Mei-Lin YANG, Hong-Gang YIN, Jian SHANG. Retrieval of cloud microphysics parameters from spaceborne 94/220GHz dual-frequency cloud radar based on non-spherical ice particles[J]. Journal of Infrared and Millimeter Waves, 2021, 40(5): 605 Copy Citation Text

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DFR and D0curves of six non spherical particles

Fig. 1.

D F R

and

D_{0}

curves of six non spherical particles

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Fig. 2. Radar Reflectivity factor profiles of sstr（a）and hexs（b）for 94 and 220GHz

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Fig. 3. Flowchart of retrieval algorithm

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Fig. 4. Comparison between parameters of the model and those retrieved from iteration method

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Fig. 5. Retrieval error for ice water content（a）and distribution of SNR（b）

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Fig. 6. The profile of radar reflectivity factor with noise of 0.5 dB（a）and profile of retrieval error for ice water content（b）

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Fig. 7. The variation of retrieval error of sstr with ice water content under 0.5 dB system noise

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频率（GHz）	13.4，35.6，85.5，94，118，150，166，183，220，340
温度（⁰C）	0，-10，-20，-30，-40
形状	编号	英文全称	英文简称
长柱	0	hexagonal long column	hexl
短柱	1	hexagonal short column	hexs
厚柱	2	hexagonal block column	hexb
厚板	3	hexagonal thickplate	hexf
薄板	4	hexagonal thin plate	hexp
三瓣子弹花	5	3-bullet rosette	ros3
四瓣子弹花	6	4-bullet rosette	ros4
五瓣子弹花	7	5-bullet rosette	ros5
六瓣子弹花	8	6-bullet rosette	ros6
星状雪花	9	sector snowflake	sstr
树枝状雪花	10	dendrite snowflake	sden

Table 1. Characteristics of ice particles in Liu’s database

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Type	D₀	Log（N₀）	IWC	r_e
Sstr	1.9828e-04	7.5420e-05	1.9007e-04	1.9421e-04
Hexs	0.007 5	0.002 7	0.004 4	0.007 5
Ros3	9.2164e-04	4.0649e-04	0.0014	9.1078e-04

Table 2. Retrieval error of cloud microphysical parameters（%）

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Type	+0.5	+1.0	+1.5	-0.5	-1.0	-1.5
Sstr	15.834 3	35.144 4	59.130 8	13.177 6	24.275 0	33.712 7
hexs	40.109 0	119.231 6	326.661 5	20.687 9	35.422 9	46.935 7
Ros3	19.994 1	46.940 0	86.285 4	15.532 0	27.953 8	38.094 1

Table 3. Comparison between retrieval errors of increasing noise（+）or decreasing noise（-）

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	D0=0.03	D0=0.04	D0=0.05	D0=0.06
N0=1 $\times$ 10⁵	12.353 4	12.725 0	13.380 8	14.270 7
N0=3 $\times$ 10⁵	12.658 9	13.794 3	15.834 3	18.616 1
N0=5 $\times$ 10⁵	12.967 4	14.895 0	18.423 1	23.206 6
N0=8 $\times$ 10⁵	13.436 2	16.611 0	22.578 7	30.419 0
N0=1 $\times$ 10⁶	13.752 8	17.800 8	25.550 8	35.337 2

Table 4. Retrieval error of ice water content with different particle size parameters

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