Summer Ice Crystal Precipitation at the South Pole
Summer Ice Crystal Precipitation at the South Pole
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南极夏季冰晶降水
DOI：
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发表时间：
1975
期刊：
影响因子：
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通讯作者：
A. Hogan
中科院分区：
文献类型：
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作者：
A. Hogan
摘要1974年1月至2月期间，在南极观测到冰晶沉淀，并复制了冰晶。晶体呈柱状。这些圆柱是中空的或棱柱形的，有时是子弹的组合形式。这些组合非常脆弱，撞击后会分解成单独的子弹。在两种情况下观察到较小的“金刚石尘”晶体。NOAA-NWS无线电探空仪数据显示，空气在650至600毫巴（即，在整个过程中（在整个过程中）。当卷云带出现在较高的高度时，只在表面观察到冰晶降水。很可能是从卷云上方不远处落下的冰晶，在穿过潮湿层时生长成较大的柱状晶体。由于这些层能够保持饱和，在-35 °C的温度下不会沉淀或形成冰雾或云，因此异质冻结核可能是......
Abstract Ice crystal precipitation was observed and the crystals replicated, at the South Pole during January and February 1974. The crystals were of columnar form. These columns were hollow or prismatic, and sometimes were in the form of combinations of bullets. These combinations were very fragile, disintegrating into individual bullets upon impaction. Smaller “diamond dust” crystals were observed on two occasions. NOAA-NWS radiosonde data showed that the air was supersaturated with respect to ice at 650 to 600 mb (i.e., just above the surface) throughout the period. Ice crystal precipitation was only observed at the surface when cirrus bands were present at higher altitudes. It is likely that ice crystals, descending from the cirrus only a short distance above, grew to the larger columnar crystals while falling through the moist layer. As these layers were able to remain saturated, without precipitating or forming ice fogs or clouds at temperatures of −35°C, heterogeneous freezing nuclei were probably ...