Microphysical Properties of Generating Cells Over the Southern Ocean: Results From SOCRATES
Microphysical Properties of Generating Cells Over the Southern Ocean: Results From SOCRATES
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南大洋上空生成细胞的微物理特性：苏格拉底的结果
DOI：
10.1029/2019jd032237
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发表时间：
2020-06
期刊：
影响因子：
--
通讯作者：
Darin W. Toohey
中科院分区：
文献类型：
--
作者：
Yang Wang;Greg M. McFarquhar;Robert M. Rauber;Chuanfeng Zhao;Wei Wu;Joseph A. Finlon;Daniel M. Stechman;Jeffery Stith;Jorgen B. Jensen;Martin Schnaiter;Emma Järvinen;Fritz Waitz;Jothiram Vivekan;an;Michael Dixon;Bryan Rainwater;Darin W. Toohey
比较了NCAR/NSF G-V飞机上的原位云探测器测量的南大洋云辐射气溶胶输送实验研究（SOCRATES）期间在南大洋（SO）上观测到的过冷液态水（SLW）和冰内部和之间的普遍生成单元（GC）的整体微物理特性和数量分布函数（N（D））。在所有GC内均检测到SLW，平均液态水含量为0.31 ± 0.19 g m−3，比GC之间的值大11%。气相色谱内和气相色谱间液滴（最大尺寸D < 50 μm）的N（D）只有微小的差异。另一方面，对于冰粒，GC内D > 200 μm的平均浓度（中位质量直径）为2.0 ± 3.3 L-1（323 ± 263 μm），比GC外的值高65%（37%）。随着D的增加，百分比差异变得更大（高达~500%）。GC内部的更多和更大的冰粒表明GC上升气流通过沉积和成霜为颗粒生长提供了有利的环境，并且混合过程在重新分配较大颗粒方面效率较低。观察到的GC的水平尺度范围为200至600 m，平均值为395 ± 162 m，小于以往研究中观察到的GC宽度。这项研究扩展了知识的微物理特性和过程中发挥作用的GC在更广泛的条件比以前可用。
The bulk microphysical properties and number distribution functions (N(D)) of supercooled liquid water (SLW) and ice inside and between ubiquitous generating cells (GCs) observed over the Southern Ocean (SO) during the Southern Ocean Clouds Radiation Aerosol Transport Experimental Study (SOCRATES) measured by in situ cloud probes onboard the NCAR/NSF G‐V aircraft are compared. SLW was detected inside all GCs with an average liquid water content of 0.31 ± 0.19 g m−3, 11% larger than values between GCs. The N(D) of droplets (maximum dimension D < 50 μm) inside and between GCs had only slight differences. For ice particles, on the other hand, the mean concentration (median mass diameter) with D > 200 μm inside GCs was 2.0 ± 3.3 L−1 (323 ± 263 μm), 65% (37%) larger than values outside GCs. As D increases, the percentage differences became larger (up to ~500%). The more and larger ice particles inside GCs suggest the GC updrafts provide a favorable environment for particle growth by deposition and riming and that mixing processes are less efficient at redistributing larger particles. The horizontal scale of observed GCs ranged from 200 to 600 m with a mean of 395 ± 162 m, smaller than GC widths observed in previous studies. This study expands knowledge of the microphysical properties and processes acting in GCs over a wider range of conditions than previously available.
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