Universität zu Köln

Gong, Jie, Zeng, Xiping, Wu, Dong L., Munchak, S. Joseph, Li, Xiaowen, Kneifel, Stefan ORCID: 0000-0003-2220-2968, Ori, Davide ORCID: 0000-0002-9964-2200, Liao, Liang and Barahona, Donifan ORCID: 0000-0001-5786-1344 (2020). Linkage among ice crystal microphysics, mesoscale dynamics, and cloud and precipitation structures revealed by collocated microwave radiometer and multifrequency radar observations. Atmos. Chem. Phys., 20 (21). S. 12633 - 12654. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 1680-7324

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Abstract

Ice clouds and falling snow are ubiquitous globally and play important roles in the Earth's radiation budget and precipitation processes. Ice particle microphysical properties (e.g., size, habit and orientation) are not only influenced by the ambient environment's dynamic and thermodynamic conditions, but are also intimately connected to the cloud radiative effects and particle fall speeds, which therefore have an impact on future climate projection as well as on the details of the surface precipitation (e.g., onset time, location, type and strength). Our previous work revealed that high-frequency (> 150 GHz) polarimetric radiance difference (PD) from passive microwave sensors is a good indicator of the bulk aspect ratio of horizontally oriented ice particles that often occur inside anvil clouds and/or stratiform precipitation. In this current work, we further investigate the dynamic and thermodynamic mechanisms and cloud-precipitation structures associated with ice-phase microphysics corresponding to different PD signals. In order to do so, collocated CloudSat radar (W-band) and Global Precipitation Measurement Dual-frequency Precipitation Radar (GPM DPR, Ku-Ka-bands) observations as well as European Centre for Medium-Range Weather Forecasts (ECMWF) atmosphere background profiles are grouped according to the magnitude of PD for only stratiform precipitation and/or anvil cloud scenes. We found that horizontally oriented snow aggregates or large snow particles are likely the major contributor to the high-PD signals at 166 GHz, while low-PD magnitudes can be attributed to small cloud ice, randomly oriented snow aggregates, riming snow or supercooled water. Further, high-PD (low-PD) scenes are found to be associated with stronger (weaker) wind shear and higher (lower) ambient humidity, both of which help promote (prohibit) the growth of frozen particles and the organization of convective systems. An ensemble of squall line cases is studied at the end to demonstrate that the PD asymmetry in the leading and trailing edges of the deep convection line is closely tied to the anvil cloud and stratiform precipitation layers, respectively, suggesting the potential usefulness of PD as a proxy of stratiform-convective precipitation flag, as well as a proxy of convection life stage.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Gong, Jie UNSPECIFIED UNSPECIFIED UNSPECIFIED Zeng, Xiping UNSPECIFIED UNSPECIFIED UNSPECIFIED Wu, Dong L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Munchak, S. Joseph UNSPECIFIED UNSPECIFIED UNSPECIFIED Li, Xiaowen UNSPECIFIED UNSPECIFIED UNSPECIFIED Kneifel, Stefan UNSPECIFIED orcid.org/0000-0003-2220-2968 UNSPECIFIED Ori, Davide UNSPECIFIED orcid.org/0000-0002-9964-2200 UNSPECIFIED Liao, Liang UNSPECIFIED UNSPECIFIED UNSPECIFIED Barahona, Donifan UNSPECIFIED orcid.org/0000-0001-5786-1344 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-312292
DOI:	10.5194/acp-20-12633-2020
Journal or Publication Title:	Atmos. Chem. Phys.
Volume:	20
Number:	21
Page Range:	S. 12633 - 12654
Date:	2020
Publisher:	COPERNICUS GESELLSCHAFT MBH
Place of Publication:	GOTTINGEN
ISSN:	1680-7324
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language WATER PATH; SCATTERING; SIGNATURES; RETRIEVAL; REFLECTIVITY; STRATIFORM; INSTRUMENT; SNOWFLAKES; SPECTRA; SYSTEMS Multiple languages Environmental Sciences; Meteorology & Atmospheric Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/31229