气候变化领域集成服务门户(CCPortal): Sensitivity of convectively driven tropical tropopause cirrus properties to ice habits in high-resolution simulations

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DOI	10.5194/acp-23-2393-2023
	Sensitivity of convectively driven tropical tropopause cirrus properties to ice habits in high-resolution simulations
	Lamraoui, Faycal; Kramer, Martina; Afchine, Armin; Sokol, Adam B.; Khaykin, Sergey; Pandey, Apoorva; Kuang, Zhiming
发表日期	2023
ISSN	1680-7316
EISSN	1680-7324
起始页码	2393
结束页码	2419
卷号	23 期号:4 页码:27
英文摘要	Cirrus clouds that form in the tropical tropopause layer (TTL) can play a key role in vertical transport through the upper troposphere and lower stratosphere, which can significantly impact the radiative energy budget and stratospheric chemistry. However, the lack of realistic representation of natural ice cloud habits in microphysical parameterizations can lead to uncertainties in cloud-related processes and cloud-climate feedbacks. The main goal of this study is to investigate the role of different cloud regimes and the associated ice habits in regulating the properties of the TTL. We compare aircraft measurements from the StratoClim field campaign to a set of numerical experiments at the scale of large-eddy simulations (LESs) for the same case study that employ different microphysics schemes. Aircraft measurements over the southern slopes of the Himalayas captured high ice water content (HIWC) up to 2400 ppmv and ice particle aggregates exceeding 700 mu m in size with unusually long residence times. The observed ice particles were mainly of liquid origin, with a small amount formed in situ. The corresponding profile of ice water content (IWC) from the ERA5 reanalysis corroborates the presence of HIWC detrained from deep-convective plumes in the TTL but underestimates HIWC by an order of magnitude. In the TTL, only the scheme that predicts ice habits can reproduce the observed HIWC, ice number concentration, and bimodal ice particle size distribution. The lower range of particle sizes is mostly represented by planar and columnar habits, while the upper range is dominated by aggregates. Large aggregates with sizes between 600 and 800 mu m have fall speeds of less than 20 cm s(-1), which explains the long residence time of the aggregates in the TTL. Planar ice particles of liquid origin contribute substantially to HIWC. The columnar and aggregate habits are in the in situ range with lower IWC and number concentrations. For all habits, the ice number concentration increases with decreasing temperature. For the planar ice habit, relative humidity is inversely correlated with fall speed. This correlation is less evident for the other two ice habits. In the lower range of supersaturation with respect to ice, the columnar habit has the highest fall speed. The difference in ice number concentration across habits can be up to 4 orders of magnitude, with aggregates occurring in much smaller numbers. We demonstrate and quantify the linear relationship between the differential sedimentation of pristine ice crystals and the size of the aggregates that form when pristine crystals collide. The slope of this relationship depends on which pristine ice habit sediments faster. Each simulated ice habit is associated with distinct radiative and latent heating rates. This study suggests that a model configuration nested down to LES scales with a microphysical parameterization that predicts ice shape evolution is crucial to provide an accurate representation of the microphysical properties of TTL cirrus and thus the associated (de)hydration process.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000936974100001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273905
作者单位	Harvard University; Harvard University; Helmholtz Association; Research Center Julich; Johannes Gutenberg University of Mainz; University of Washington; University of Washington Seattle; Centre National de la Recherche Scientifique (CNRS); UDICE-French Research Universities; Sorbonne Universite; Universite Paris Cite; Universite Paris Saclay
推荐引用方式 GB/T 7714	Lamraoui, Faycal,Kramer, Martina,Afchine, Armin,et al. Sensitivity of convectively driven tropical tropopause cirrus properties to ice habits in high-resolution simulations[J],2023,23(4):27.
APA	Lamraoui, Faycal.,Kramer, Martina.,Afchine, Armin.,Sokol, Adam B..,Khaykin, Sergey.,...&Kuang, Zhiming.(2023).Sensitivity of convectively driven tropical tropopause cirrus properties to ice habits in high-resolution simulations.ATMOSPHERIC CHEMISTRY AND PHYSICS,23(4),27.
MLA	Lamraoui, Faycal,et al."Sensitivity of convectively driven tropical tropopause cirrus properties to ice habits in high-resolution simulations".ATMOSPHERIC CHEMISTRY AND PHYSICS 23.4(2023):27.