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  Linear relationship between effective radius and precipitation water content near the top of convective clouds: measurement results from ACRIDICON–CHUVA campaign

Braga, R. C., Rosenfeld, D., Krüger, O. O., Ervens, B., Holanda, B. A., Wendisch, M., et al. (2021). Linear relationship between effective radius and precipitation water content near the top of convective clouds: measurement results from ACRIDICON–CHUVA campaign. Atmospheric Chemistry and Physics, 21(18), 14079 -14088. doi:10.5194/acp-21-14079-2021.

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 Creators:
Braga, Ramon Campos1, Author           
Rosenfeld, Daniel, Author
Krüger, Ovid O.1, Author           
Ervens, Barbara, Author
Holanda, Bruna A.1, Author           
Wendisch, Manfred, Author
Krisna, Trismono, Author
Pöschl, Ulrich1, Author           
Andreae, Meinrat O.1, Author           
Voigt, Christiane, Author
Pöhlker, Mira L.1, Author           
Affiliations:
1Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              

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 Abstract: Quantifying the precipitation within clouds is a crucial challenge to improve our current understanding of the Earth's hydrological cycle. We have investigated the relationship between the effective radius of droplets and ice particles (re) and precipitation water content (PWC) measured by cloud probes near the top of growing convective cumuli. The data for this study were collected during the ACRIDICON–CHUVA campaign on the HALO research aircraft in clean and polluted conditions over the Amazon Basin and over the western tropical Atlantic in September 2014. Our results indicate a threshold of re∼13 µm for warm rain initiation in convective clouds, which is in agreement with previous studies. In clouds over the Atlantic Ocean, warm rain starts at smaller re, likely linked to the enhancement of coalescence of drops formed on giant cloud condensation nuclei. In cloud passes where precipitation starts as ice hydrometeors, the threshold of re is also shifted to values smaller than 13 µm when coalescence processes are suppressed and precipitating particles are formed by accretion. We found a statistically significant linear relationship between PWC and re for measurements at cloud tops, with a correlation coefficient of ∼0.94. The tight relationship between re and PWC was established only when particles with sizes large enough to precipitate (drizzle and raindrops) are included in calculating re. Our results emphasize for the first time that re is a key parameter to determine both initiation and amount of precipitation at the top of convective clouds.

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Language(s): eng - English
 Dates: 2021-09-22
 Publication Status: Published online
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 Identifiers: DOI: 10.5194/acp-21-14079-2021
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Title: Atmospheric Chemistry and Physics
  Abbreviation : ACP
Source Genre: Journal
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Pages: - Volume / Issue: 21 (18) Sequence Number: - Start / End Page: 14079 - 14088 Identifier: ISSN: 1680-7316
CoNE: https://pure.mpg.de/cone/journals/resource/111030403014016