Interactive chemistry in the Laboratoire de Météorologie Dynamique general circulation model: Description and background tropospheric chemistry evaluation: INTERACTIVE CHEMISTRY IN LMDZ
Interactive chemistry in the Laboratoire de Météorologie Dynamique general circulation model: Description and background tropospheric chemistry evaluation: INTERACTIVE CHEMISTRY IN LMDZ
复制标题
DOI：
10.1029/2003jd003957
复制
发表时间：
2004-02
影响因子：
--
通讯作者：
D. Hauglustaine;F. Hourdin;L. Jourdain;M. Filiberti;S. Walters;J. Lamarque;E. Holland
中科院分区：
文献类型：
--
作者：
D. Hauglustaine;F. Hourdin;L. Jourdain;M. Filiberti;S. Walters;J. Lamarque;E. Holland
[1]本文介绍了LMDz-印加大气环流模式（LMDz）和化学与气溶胶相互作用模式（印加）的耦合模式。在这个模型的第一个版本中，考虑了代表对流层背景化学的CH 4 −NOx−CO−O3化学方案。我们得出快速的半球间交换时间为1.13-1.38年和0.70-0.82年，根据表面和压力加权混合比的惰性示踪剂，分别。该模型正确地再现了氮沉降的一般规律。然而，清除过程仍然是当前模式中不确定性的主要来源，对流降水在可溶性物质的全球分布中发挥着关键作用。全球和年度平均甲烷（7.9年）和甲基氯仿（4.6年）的化学寿命表明，OH是过高的约19-25%的模型。这种与以前估计的不一致是由于在这个版本的模型中缺少非甲烷碳氢化合物。该模式较好地模拟了大部分站点CO的分布和季节循环。然而，在几个热带地区和北方半球夏季，OH高估导致CO化学破坏过于强烈。LMDz-INCA相当好地再现了对流层大部分地区臭氧的分布。夏季北方半球对流层上层的主要分歧是由于大气环流模式中对流层顶太高。当大气环流模式的风放松对同化气象学，一个更高的变率是在对流层上部的臭氧，反映了更频繁的平流层入侵。平流层臭氧的流入量从基本情况模拟的523 Tg/年增加到轻推版本的783 Tg/年。
[1] We provide a description and evaluation of LMDz-INCA, which couples the Laboratoire de Meteorologie Dynamique general circulation model (LMDz) and the Interaction with Chemistry and Aerosols (INCA) model. In this first version of the model a CH4−NOx−CO−O3 chemical scheme representative of the background chemistry of the troposphere is considered. We derive rapid interhemispheric exchange times of 1.13–1.38 years and 0.70–0.82 years, based on surface and pressure-weighted mixing ratios of inert tracers, respectively. The general patterns of the nitrogen deposition are correctly reproduced by the model. However, scavenging processes remain a major source of uncertainty in current models, with convective precipitation playing a key role in the global distribution of soluble species. The global and annual mean methane (7.9 years) and methylchloroform (4.6 years) chemical lifetimes suggest that OH is too high by about 19–25% in the model. This disagreement with previous estimates is attributed to the missing nonmethane hydrocarbons in this version of the model. The model simulates quite satisfactorily the distribution and seasonal cycle of CO at most stations. At several tropical sites and in the Northern Hemisphere during summer, the OH overestimate leads, however, to a too intense CO chemical destruction. LMDz-INCA reproduces fairly well the distribution of ozone throughout most of the troposphere. A main disagreement appears in the Northern Hemisphere upper troposphere during summer, due to a too high tropopause in the GCM. When the GCM winds are relaxed toward assimilated meteorology, a much higher variability is obtained for ozone in the upper troposphere, reflecting more frequent stratospheric intrusions. The stratospheric influx of ozone increases from 523 Tg/yr in the base case simulation to 783 Tg/yr in the nudged version.