Marine boundary layer drizzle properties and their impact on cloud property retrieval

P. Wu, X. Dong, B. Xi

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

In this study, we retrieve and document drizzle properties, and investigate the impact of drizzle on cloud property retrieval in Dong et al. (2014a) from ground-based measurements at the ARM Azores facility from June 2009 to December 2010. For the selected cloud and drizzle samples, the drizzle occurrence is 42.6 %, with a maximum of 55.8 % in winter and a minimum of 35.6 % in summer. The annual means of drizzle liquid water path LWPd, effective radius rd, and number concentration Nd for the rain (virga) samples are 4.73 (1.25) g m-2, 61.5 (36.4) μm, and 0.38 (0.79) cm-3. The seasonal mean LWPd values are less than 3 % of the LWP values retrieved by the microwave radiometer (MWR). The annual mean differences in cloud-droplet effective radius with and without drizzle are 0.75 and 2.35 %, respectively, for the virga and rain samples. Therefore, we conclude that the impact of drizzle below the cloud base on cloud property retrieval is insignificant for a solar-transmission-based method, but significant for any retrievals using radar reflectivity.

Original languageEnglish (US)
Pages (from-to)3555-3562
Number of pages8
JournalAtmospheric Measurement Techniques
Volume8
Issue number9
DOIs
StatePublished - Sep 3 2015

ASJC Scopus subject areas

  • Atmospheric Science

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