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首页> 外文期刊>Atmospheric chemistry and physics >In situ observations of dehydrated air parcels advected horizontally in the Tropical Tropopause Layer of the western Pacific
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In situ observations of dehydrated air parcels advected horizontally in the Tropical Tropopause Layer of the western Pacific

机译：西太平洋热带对流层中水平平移的脱水空包裹的原位观测

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Water vapor observations by chilled-mirror hygrometers were conductedat Bandung, Indonesia (6.90° S, 107.60° E) andTarawa, Kiribati (1.35° N, 172.91° E) in December 2003to examine the efficiency of dehydration during horizontal advectionin the tropical tropopause layer (TTL).Trajectory analyses based on bundles of isentropic trajectories suggest thatthe modification of air parcels' identity due to irreversible mixingby the branching-out and merging-in of nearby trajectories is foundto be an important factor,in addition to the routes air parcels follow,for interpreting the water vapor concentrations observed bychilled-mirror frostpoint hygrometers in the TTL.Clear correspondence between the observed water vapor concentrationand the estimated temperature history of air parcels is foundshowing that drier air parcels were exposed to lower temperaturesthan were more humid ones during advection.Although the number of observations is quite limited,the water content in the observed air parcels on many occasionswas more than that expected from the minimum saturation mixing ratioduring horizontal advection prior to sonde observations.
机译：于2003年12月在印度尼西亚万隆（6.90°S，107.60°E）和基里巴斯塔拉瓦（1.35°N，172.91°E）进行了冷镜湿度计的水汽观测，以检查热带对流层顶层水平对流期间的脱水效率（ TTL）。基于等熵轨迹束的轨迹分析表明，由于附近轨迹的分支和合并导致不可逆混合而导致的空气包身份更改是一个重要因素，除了空气包遵循的路线之外，用于解释TTL的冷镜霜点湿度计观察到的水蒸气浓度。发现的水蒸气浓度与估计的空气包裹温度历史记录之间存在明确的对应关系，表明干燥的空气包裹在对流期间暴露于较低的温度下比潮湿的空气包裹在较低的温度下。观测次数非常有限，观测到的空气包裹中的水分含量在许多情况下，要比在探空仪观测之前水平对流过程中最小饱和混合比所期望的要大。

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