Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016JD025672 |
Examining impacts of mass-diameter (m-D) and area-diameter (A-D) relationships of ice particles on retrievals of effective radius and ice water content from radar and lidar measurements | |
Ham, Seung-Hee1; Kato, Seiji2; Rose, Fred G.1 | |
2017-03-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2017 |
卷号 | 122期号:6 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Mass-diameter (m-D) and projected area-diameter (A-D) relations are often used to describe the shape of nonspherical ice particles. This study analytically investigates how retrieved effective radius (r(eff)) and ice water content (IWC) from radar and lidar measurements depend on the assumption of m-D [m(D)=a D-b] and A-D [A(D)= D] relationships. We assume that unattenuated reflectivity factor (Z) and visible extinction coefficient (k(ext)) by cloud particles are available from the radar and lidar measurements, respectively. A sensitivity test shows that r(eff) increases with increasing a, decreasing b, decreasing , and increasing . It also shows that a 10% variation of a, b, , and induces more than a 100% change of r(eff). In addition, we consider both gamma and lognormal particle size distributions (PSDs) and examine the sensitivity of r(eff) to the assumption of PSD. It is shown that r(eff) increases by up to 10% with increasing dispersion () of the gamma PSD by 2, when large ice particles are predominant. Moreover, r(eff) decreases by up to 20% with increasing the width parameter () of the lognormal PSD by 0.1. We also derive an analytic conversion equation between two effective radii when different particle shapes and PSD assumptions are used. When applying the conversion equation to nine types of m-D and A-D relationships, r(eff) easily changes up to 30%. The proposed r(eff) conversion method can be used to eliminate the inconsistency of assumptions that made in a cloud retrieval algorithm and a forward radiative transfer model. |
英文关键词 | ice particle shape mass-diameter (m-D) area-diameter (A-D) effective radius radar lidar |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000399655200014 |
WOS关键词 | BULK SCATTERING PROPERTIES ; IN-SITU OBSERVATIONS ; CLOUD RADAR ; RADIATIVE PROPERTIES ; TERMINAL VELOCITIES ; SIZE DISTRIBUTIONS ; OPTICAL-PROPERTIES ; CIRRUS CLOUDS ; RAMAN LIDAR ; PART I |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/32190 |
专题 | 气候变化 |
作者单位 | 1.Sci Syst & Applicat Inc, Hampton, VA 23666 USA; 2.NASA, Langley Res Ctr, Hampton, VA 23665 USA |
推荐引用方式 GB/T 7714 | Ham, Seung-Hee,Kato, Seiji,Rose, Fred G.. Examining impacts of mass-diameter (m-D) and area-diameter (A-D) relationships of ice particles on retrievals of effective radius and ice water content from radar and lidar measurements[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2017,122(6). |
APA | Ham, Seung-Hee,Kato, Seiji,&Rose, Fred G..(2017).Examining impacts of mass-diameter (m-D) and area-diameter (A-D) relationships of ice particles on retrievals of effective radius and ice water content from radar and lidar measurements.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,122(6). |
MLA | Ham, Seung-Hee,et al."Examining impacts of mass-diameter (m-D) and area-diameter (A-D) relationships of ice particles on retrievals of effective radius and ice water content from radar and lidar measurements".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 122.6(2017). |
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