對(duì)非球形冰晶94 GHz云雷達(dá)后向散射和衰減的研究

doi:10.3969/2015jms.0002

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對(duì)非球形冰晶94 GHz云雷達(dá)后向散射和衰減的研究
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                        10.3969/2015jms.0002
                    
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基金項(xiàng)目:公益性行業(yè)(氣象)科研專項(xiàng)(GYHY201206038,GYHY201306040,GYHY201406033);江蘇省高校自然科學(xué)重大基礎(chǔ)研究項(xiàng)目(10KJA170030);災(zāi)害天氣國(guó)家重點(diǎn)實(shí)驗(yàn)室開(kāi)放課題(2010LASW-A01);江蘇省自然科學(xué)研究基金資助項(xiàng)目(BK2012466);北極閣基金(BJG201208,BJG201102);山東省氣象局面上課題(2015sdqxm13);國(guó)家自然科學(xué)基金資助項(xiàng)目(41305031);江蘇高校優(yōu)勢(shì)學(xué)科建設(shè)工程資助項(xiàng)目(PAPD)

Back scattering and attenuation of non-spherical ice crystals with 94 GHz millimeter-wavelength

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摘要:

針對(duì)94 GHz毫米波云雷達(dá)的數(shù)據(jù)處理,基于離散偶極子近似法(DDA)計(jì)算了幾種非球形冰晶的后向散射及衰減效率,探討了不同冰云模型下冰云的雷達(dá)反射率因子(Z_e)和衰減系數(shù)(k)及冰水含量(IWC,記作W)的關(guān)系。結(jié)果表明:(1)形狀對(duì)冰晶的散射及衰減效率與粒子大小有關(guān)。(2)在實(shí)際的冰云中,將六角形冰晶和橢圓冰晶看做同體積的球形粒子將低估其衰減和后向散射。將聚合物冰晶看做等體積球形,將高估其后向散射及衰減,子彈花冰晶的后向散射與同體積的球形相比有減小也有增大,但是衰減比同體積球形的小。(3)冰云模型對(duì)Z_e-k、Z_e-W關(guān)系具有較大影響,假設(shè)滴譜相同的條件下,得到了具體冰云模型下對(duì)應(yīng)Z_e-k、Z_e-W關(guān)系的系數(shù)。這些探討為我國(guó)W波段云雷達(dá)的數(shù)據(jù)處理提供了參考。

Abstract:

Aiming at 94 GHz millimeter-wavelength cloud radar, the back scattering and attenuation of non-spherical ice crystals with a variety of shapes are analyzed by DDA algorithm, moreover, the relationship between radar reflectivity factor(Z_e), attenuation coefficient(k) and Ice Water Content(W) is revealed. Results show that:(1) the effects of ice particles types on back scattering and attenuation of ice particles depend on their sizes.(2) In the actual ice clouds, treating the hexagonal or ellipsoidal ice crystals as the same volume spherical particles would underestimate its attenuation and back scattering, however, treating aggregations as the same spherical volume would overestimate the scattering and attenuation. The back scattering of bullet flower crystals, compared with the spherical volume, may decrease or increase, but the attenuation is certain to be smaller than the spherical particles.(3) Ice models have great effects on Z_e-k, Z_e-W relations. The relationships between attenuation coefficient and radar reflectivity factor are derived based on refined models for the ice hydrometeors in the case of same particle size distributions. The results help process Chinese W band cloud radars data.

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吳舉秀,魏鳴,黃磊,涂愛(ài)琴,劉彬.對(duì)非球形冰晶94 GHz云雷達(dá)后向散射和衰減的研究.氣象科學(xué),2016,36(1):63-70 WU Juxiu, WEI Ming, HUANG Lei, TU Aiqin, LIU Bin. Back scattering and attenuation of non-spherical ice crystals with 94 GHz millimeter-wavelength. Journal of the Meteorological Sciences,2016,36(1):63-70

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收稿日期:2014-09-17
最后修改日期:2014-12-31
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在線發(fā)布日期: 2016-04-11
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