The detection capability to ice clouds for space-borne terahertz dual-frequency radar

Ju-Xiu WU; Lei YANG; Fang-Li DOU; Da-Wei AN

doi:10.11972/j.issn.1001-9014.2020.06.009

Journals >Journal of Infrared and Millimeter Waves >Volume 39 >Issue 6 >Page 718 > Article

Journal of Infrared and Millimeter Waves
Vol. 39, Issue 6, 718 (2020)

The detection capability to ice clouds for space-borne terahertz dual-frequency radar

Ju-Xiu WU¹, Lei YANG^2、*, Fang-Li DOU³, and Da-Wei AN³

Author Affiliations

¹Ensuring Center of Atmospheric Sounding Technology，Weather Bureau of Shandong Province， Jinan250031， China

²Qingdao Meteorological Bureau， Qingdao266003， China

³National Meteorological Satellite Center， Beijing100081， China

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DOI: 10.11972/j.issn.1001-9014.2020.06.009 Cite this Article

Ju-Xiu WU, Lei YANG, Fang-Li DOU, Da-Wei AN. The detection capability to ice clouds for space-borne terahertz dual-frequency radar[J]. Journal of Infrared and Millimeter Waves, 2020, 39(6): 718 Copy Citation Text

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Fig. 1. The backscattering（a, b） and attenuation cross sections（c, d） of non-spherical ice crystals to 340 GHz wave

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The change of the radar reflectivity factor （Ze） of ice-crystal clouds with the median dimension （Dm）（a1、a2、a3）and IWC（b1、b2、b3）

Fig. 2. The change of the radar reflectivity factor （Z_e） of ice-crystal clouds with the median dimension （D_m）（a₁、a₂、a₃）and IWC（b₁、b₂、b₃）

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Fig. 3. （a） The attenuation coefficient of ice-crystal cloudand, and （b） the ratio of attenuation coefficients of two frequency bands

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Fig. 4. The change of the equivalent radar reflectivity factor （Z_e） with the ice water content （IWC） and D_m

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Fig. 5. The changes of dual wavelength reflectivity ratio （DWR） with the D_mand IWC

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Fig. 6. The DWR based on the Baum volume scattering model

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Fig. 7. h=5∼7 km, （a）the vertical profiles of the water content, （b）the equivalent radar reflectivity factors and the radar reflectivity factor after attenuation from 340 cloud radar, and （c） the DWR

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形状	形状代码	最大尺度范围D_max/mm）	等效质量球半径r_e/mm）
长柱状L/d=4	0	0.121∼4.835	0.025∼1
短柱状L/d=2 厚柱状L/d=1	1 2	0.083∼3.304 0.066∼2.532	0.025∼1 0.025∼1
厚板状L/d=1/5	3	0.081∼3.246	0.025∼1
薄板状（L/d=1/20	4	0.127∼5.059	0.025∼1
瓣子弹花3	5	0.05∼10	0.019∼1.086
瓣子弹花4	6	0.05∼10	0.019∼0.984
瓣子弹花5	7	0.05∼10	0.021∼1.058
瓣子弹花6	8	0.05∼10	0.021∼1.123
星状雪花	9	0.05∼10	0.025∼0.672
树枝状雪花	10	0.075∼12.454	0.033∼0.838

Table 1. 冰晶粒子形状、形状代码、最大尺度范围及对应等效半径范围

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云厚/km	I WC/（g/m³）	可探测云厚（%、km）		DWR最大值/dB	可测IWC最大值/（g/m³）
2	0.000 1∼0.1	91%	1.82	17.5	0.1
2	0.000 1∼0.2	90%	1.8	23	0.2
2	0.001∼0.49	75%	1.5	35	0.49
2	0.001∼0.856	60%	1.2	45	0.856
2	0.001 7∼1.114	53%	1.06	48	1.023 3
5	0.000 1∼0.1	80%	4.0	23.4	0.1
5	0.000 1∼0.2	68%	3.4	35.6	0.2
5	0.001∼-0.49	50%	2.5	45	0.49
5	0.001∼-0.856	42%	2.1	43	0.6
5	0.0017∼1.114	40%	2	45	0.7
5	0.0015∼1	41%	2.05	46	0.69

Table 2. 可测云厚、DWR与IWC的关系

Ju-Xiu WU, Lei YANG, Fang-Li DOU, Da-Wei AN. The detection capability to ice clouds for space-borne terahertz dual-frequency radar[J]. Journal of Infrared and Millimeter Waves, 2020, 39(6): 718

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