High ice water content at low radar reflectivity near deep convection &ndash; Part 2: Evaluation of microphysical pathways in updraft parcel simulations

Ackerman, A. S.; Fridlind, A. M.; Grandin, A.; Dezitter, F.; Weber, M.; Strapp, J. W.; Korolev, A. V.

doi:10.5194/acp-15-11729-2015

Articles | Volume 15, issue 20

https://doi.org/10.5194/acp-15-11729-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/acp-15-11729-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 15, issue 20

Research article

|

22 Oct 2015

Research article |

| 22 Oct 2015

High ice water content at low radar reflectivity near deep convection – Part 2: Evaluation of microphysical pathways in updraft parcel simulations

A. S. Ackerman, A. M. Fridlind, A. Grandin, F. Dezitter, M. Weber, J. W. Strapp, and A. V. Korolev

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Aug 2025	43	10	0	53
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Cumulative views and downloads (calculated since 17 Jun 2015)

Month	HTML	PDF	XML	Total
Jun 2015	61	70	5	136
Jul 2015	47	38	10	95
Aug 2015	22	11	3	36
Sep 2015	15	14	21	50
Oct 2015	87	56	6	149
Nov 2015	73	52	5	130
Dec 2015	24	28	7	59
Jan 2016	45	18	2	65
Feb 2016	26	13	0	39
Mar 2016	20	13	2	35
Apr 2016	6	6	0	12
May 2016	7	2	0	9
Jun 2016	8	3	3	14
Jul 2016	9	7	3	19
Aug 2016	11	9	3	23
Sep 2016	12	4	1	17
Oct 2016	9	3	0	12
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Dec 2016	2	1	0	3
Jan 2017	14	3	3	20
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May 2017	23	15	4	42
Jun 2017	32	9	3	44
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Nov 2023	29	3	1	33
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Jan 2024	47	3	1	51
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Aug 2025	43	10	0	53
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Oct 2025	27	22	0	49
Nov 2025	33	21	6	60

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An updraft parcel model with size-resolved microphysics is used to investigate microphysical pathways leading to ice water content > 2 g m-3 with mass median area-equivalent diameter of 200-300 micron reported at ~11 km in tropical deep convection. Parcel simulations require substantial source of small crystals at temperatures > ~-10 deg C growing by vapor deposition. Warm rain in weaker updrafts surprisingly leads to greater ice mass owing to reduced competition for available water vapor.