Estimation of liquid water path below the melting layer in stratiform precipitation systems using radar measurements during MC3E
AffiliationUniv Arizona, Dept Hydrol & Atmospher Sci
MetadataShow full item record
PublisherCOPERNICUS GESELLSCHAFT MBH
CitationTian, J., Dong, X., Xi, B., Williams, C. R., & Wu, P. (2019). Estimation of liquid water path below the melting layer in stratiform precipitation systems using radar measurements during MC3E. Atmospheric Measurement Techniques, 12(7), 3743-3759.
Rights© Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License.
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AbstractIn this study, the liquid water path (LWP) below the melting layer in stratiform precipitation systems is retrieved, which is a combination of rain liquid water path (RLWP) and cloud liquid water path (CLWP). The retrieval algorithm uses measurements from the vertically pointing radars (VPRs) at 35 and 3 GHz operated by the US Department of Energy Atmospheric Radiation Measurement (ARM) and National Oceanic and Atmospheric Administration (NOAA) during the field campaign Midlatitude Continental Convective Clouds Experiment (MC3E). The measured radar reflectivity and mean Doppler velocity from both VPRs and spectrum width from the 35 GHz radar are utilized. With the aid of the cloud base detected by a ceilometer, the LWP in the liquid layer is retrieved under two different situations: (I) no cloud exists below the melting base, and (II) cloud exists below the melting base. In (I), LWP is primarily contributed from raindrops only, i.e., RLWP, which is estimated by analyzing the Doppler velocity differences between two VPRs. In (II), cloud particles and raindrops coexist below the melting base. The CLWP is estimated using a modified attenuation-based algorithm. Two stratiform precipitation cases (20 and 11 May 2011) during MC3E are illustrated for two situations, respectively. With a total of 13 h of samples during MC3E, statistical results show that the occurrence of cloud particles below the melting base is low (9 %); however, the mean CLWP value can be up to 0.56 kgm(2), which is much larger than the RLWP (0.10 kgm(2)). When only raindrops exist below the melting base, the average RLWP value is larger (0.32 kgm(2)) than the with-cloud situation. The overall mean LWP below the melting base is 0.34 kgm(2) for stratiform systems during MC3E.
NoteOpen access journal
VersionFinal published version
SponsorsDOE CMDV project [DE-SC0017015]; NASA CERES project [NNX17AC52G]; DOE ASR project [DE-SC0014294]
Except where otherwise noted, this item's license is described as © Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License.