对流聚集对水蒸气稳定同位素组成的影响

IF 8.3 Q1 GEOSCIENCES, MULTIDISCIPLINARY AGU Advances Pub Date : 2023-09-06 DOI:10.1029/2023AV000877
Joseph Galewsky, Matthias Schneider, Christopher Diekmann, Addisu Semie, Sandrine Bony, Camille Risi, Kerry Emanuel, Helene Brogniez
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引用次数: 0

摘要

水蒸气同位素组成的遥感数据集与对流聚集的客观测量一起使用,以更好地了解2015-2020年期间对流聚集对全球热带(30°N至30°S)大气水文循环的影响。当对流未聚集时,垂直速度剖面是头重脚轻的,混合比增加,水蒸气δD随着平均降水率的增加而减少,这与砧下的部分水文气象蒸发进入相对潮湿的大气柱相一致。聚集对流与底部重垂直速度剖面有关,混合比与δD之间呈正相关,这一结果与观测水平附近浅层对流减弱引起的同位素富集一致。中间聚集度的δD随混合比或沉淀速率的变化不显著。对流聚集为理解一系列对流环境中混合比和同位素组成之间的关系提供了一个有用的范例。本文的结果可能对各种应用有用,包括古气候档案的解释和对流数值模拟的评估。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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The Influence of Convective Aggregation on the Stable Isotopic Composition of Water Vapor

Remote sensing datasets of water vapor isotopic composition are used along with objective measures of convective aggregation to better understand the impact of convective aggregation on the atmospheric hydrologic cycle in the global tropics (30°N to 30°S) for the period 2015–2020. When convection is unaggregated, vertical velocity profiles are top-heavy, mixing ratios increase and water vapor δD decreases as the mean precipitation rate increases, consistent with partial hydrometeor evaporation below anvils into a relatively humid atmospheric column. Aggregated convection is associated with bottom-heavy vertical velocity profiles and a positive correlation between mixing ratio and δD, a result that is consistent with isotopic enrichment from detrainment of shallow convection near the observation level. Intermediate degrees of aggregation do not display significant variation in δD with mixing ratio or precipitation rate. Convective aggregation provides a useful paradigm for understanding the relationships between mixing ratio and isotopic composition across a range of convective settings. The results presented here may have utility for a variety of applications including the interpretation of paleoclimate archives and the evaluation of numerical simulations of convection.

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