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首页> 外文期刊>Geophysical Research Letters >On the availability of uncoated mineral dust ice nuclei in coldcloud regions
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On the availability of uncoated mineral dust ice nuclei in coldcloud regions

机译:关于冷云地区未覆盖的矿物尘埃冰核的可用性

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The ice nucleation efficiency of mineral dust decreaseswhen it acquires coatings, e.g. through processing in liquidclouds.This study explores the availability of unprocessedmineral dust for interactions with clouds.Weperformedforward trajectory calculations originating near the surfaceof the Chinese Taklimakan desert.The initial specifichumidity of each trajectory was assumed to be conservedand used to calculate the relative humidities with respect towater and ice,allowing us to estimate the formation ofliquid,mixed-phase and ice clouds downstream.Practicallynone of the simulated air parcels reached conditions suitablefor homogeneous nucleation of ice(T S—40°C)withoutexperiencing water saturation first.Potentially the biggestimpact of mineral dust is predicted to be on mixed-phaseclouds.Furthermore,most trajectories passed through ice-saturated (but water-subsaturated)regions where"warm"(T-40°C)ice clouds may form prior to mixed-phaseclouds.
机译:矿物粉尘在获得涂层后,例如冰层中的冰成核效率会降低。本研究探索了未经处理的矿物粉尘与云相互作用的可利用性。对中国塔克拉玛干沙漠表面附近进行的前向轨迹计算进行了计算,假设每条轨迹的初始比湿度均得以保留并用于计算相对于水的相对湿度和冰,使我们能够估计下游的液态,混合相和冰云的形成。实际上,没有一个模拟的空气包裹达到适合冰均质成核的条件(TS-40°C),而首先没有水饱和。潜在的最大影响是矿物粉尘此外,大多数轨迹通过冰饱和(但水不饱和)的区域,在这些区域中可能会在混合相云之前形成“温暖”(T-40°C)冰云。

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