Simulation of the isotopic composition of stratospheric water vapour – Part 1 5539 2 . 1 Water isotopologues in the hydrological cycle of
Simulation of the isotopic composition of stratospheric water vapour – Part 1 5539 2 . 1 Water isotopologues in the hydrological cycle of
复制标题
平流层水蒸气同位素组成的模拟 – 第 1 部分 5539 1 水文循环中的水同位素体
DOI：
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
S. Lossow
中科院分区：
文献类型：
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作者：
R. Eichinger;P. Jöckel;S. Brinkop;M. Werner;S. Lossow
这项模拟研究的目的是通过调查水的同位素比率，更好地了解决定平流层水蒸气收支的过程。在化学-气候模式EMAC中引入了一个额外的(与实际情况分开的)水循环，包括水的同位素HDO和H2O及其物理分馏过程。此外，还对甲烷氧化对H2O和HDO的贡献进行了显式计算。通过模式扩展，可以在整个平流层和对流层过渡区域详细分析水蒸气及其与氢的同位素比率。为了确保在模型的水循环中正确地表示水同位素，已分几个步骤对扩展系统进行了评估。通过将模拟的降水同位素组成与地面网络(GNIP)的测量结果以及启用同位素的大气环流模式ECHAM5-WISO的结果进行比较，评估了物理分馏效果。通过与化学输送模型(一维，CHEM2D)的比较和无线电探空仪飞行的测量，证实了该模型在平流层中代表了化学HDO前体CH3D。最后，根据三种不同卫星仪器(MIPAS、ACE-FTS、SMR)的反演，对模拟的平流层HDO和水蒸气的同位素组成进行了评估。现在可以部分解释三颗卫星中的两颗卫星在平流层水蒸气同位素比率上的差异。
This modelling study aims at an improved understanding of the processes that determine the water vapour budget in the stratosphere by means of the investigation of water isotope ratios. An additional (and separate from the actual) hydrological cycle has been introduced into the chemistry–climate model EMAC, including the water isotopologues HDO and H2 O and their physical fractionation processes. Additionally an explicit computation of the contribution of methane oxidation to H2O and HDO has been incorporated. The model expansions allow detailed analyses of water vapour and its isotope ratio with respect to deuterium throughout the stratosphere and in the transition region to the troposphere. In order to assure the correct representation of the water isotopologues in the model’s hydrological cycle, the expanded system has been evaluated in several steps. The physical fractionation effects have been evaluated by comparison of the simulated isotopic composition of precipitation with measurements from a ground-based network (GNIP) and with the results from the isotopologue-enabled general circulation model ECHAM5-wiso. The model’s representation of the chemical HDO precursor CH3D in the stratosphere has been confirmed by a comparison with chemical transport models (1-D, CHEM2D) and measurements from radiosonde flights. Finally, the simulated stratospheric HDO and the isotopic composition of water vapour have been evaluated, with respect to retrievals from three different satellite instruments (MIPAS, ACE-FTS, SMR). Discrepancies in stratospheric water vapour isotope ratios between two of the three satellite retrievals can now partly be explained.
平流层水蒸气同位素组成的模拟 â 第 2 部分：HDO / H 2 O 变化的研究
影响因子：
6.3
作者：
Eichinger;P. Jöckel;S. Lossow
通讯作者：
S. Lossow