Global simulation of tropospheric chemistry at 12.5 km resolution: performance and evaluation of the GEOS-Chem chemical module (v10-1) within the NASA GEOS Earth system model (GEOS-5 ESM)
Global simulation of tropospheric chemistry at 12.5 km resolution: performance and evaluation of the GEOS-Chem chemical module (v10-1) within the NASA GEOS Earth system model (GEOS-5 ESM)
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DOI：
10.5194/gmd-11-4603-2018
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发表时间：
2018-11
影响因子：
5.1
通讯作者：
Lu Hu;C. Keller;M. S. Long;T. Sherwen;Benjamin M. Auer;Arlindo M. da Silva;J. Nielsen;S. Pawson;Matthew A. Thompson;A. Trayanov;K. Travis;S. Grange;M. Evans;D. Jacob
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文献类型：
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作者：
Lu Hu;C. Keller;M. S. Long;T. Sherwen;Benjamin M. Auer;Arlindo M. da Silva;J. Nielsen;S. Pawson;Matthew A. Thompson;A. Trayanov;K. Travis;S. Grange;M. Evans;D. Jacob
抽象的。我们在 NASA 戈达德地球观测系统模型版本 5 地球系统模型 (GEOS-5 ESM) 中以立方体 c720 (∼12.5×12.5km2) 分辨率对对流层化学（158 种耦合物质）进行了全年在线全球模拟，其中 GEOS-Chem 作为化学模块 (G5NR-chem)。 GEOS 中的 GEOS-Chem 模块使用与大型大气化学研究社区开发的离线 GEOS-Chem 化学传输模型 (CTM) 完全相同的代码。通过这种方式，该社区对 GEOS-Chem CTM 的持续更新可以无缝地传递到 GEOS 化学模块，该模块保持科学状态并可参考最新版本的 GEOS-Chem。为期一年的 G5NR-chem 模拟旨在作为观测系统模拟实验 (OSSE) 的 Nature Run，以支持未来对流层化学的对地静止卫星星座。它需要在 4707 个计算核心上花费 31 个工作日，其中仅 24% 的时间花在 GEOS-Chem 化学模块上。使用 GEOS-Chem 化学进行的 GEOS-5 Nature Run 结果显示与离线 GEOS-Chem CTM 一致，并与全球和区域观测结果进行了进一步比较。模拟显示，相对于臭氧监测仪器（OMI）卫星，对流层臭氧没有显着的全球偏差，并且与空间和季节观测高度相关。它成功捕获了臭氧探空仪在世界不同地区测量的臭氧垂直分布，以及 2013 年 8 月至 9 月美国东南部地区飞机活动的排放、大气成分、云和气候耦合研究 (SEAC4RS) 中对臭氧及其前体的观测结果。它系统性地高估了美国和欧洲站点的表面臭氧浓度 10 ppbv，目前 GEOS-Chem CTM 社区正在解决这个问题，GEOS ESM 将通过在线代码的无缝更新从中受益。
Abstract. We present a full-year online global simulation of tropospheric chemistry (158 coupled species) at cubed-sphere c720 (∼12.5×12.5km2) resolution in the NASA Goddard Earth Observing System Model version 5 Earth system model (GEOS-5 ESM) with GEOS-Chem as a chemical module (G5NR-chem). The GEOS-Chem module within GEOS uses the exact same code as the offline GEOS-Chem chemical transport model (CTM) developed by a large atmospheric chemistry research community. In this way, continual updates to the GEOS-Chem CTM by that community can be seamlessly passed on to the GEOS chemical module, which remains state of the science and referenceable to the latest version of GEOS-Chem. The 1-year G5NR-chem simulation was conducted to serve as the Nature Run for observing system simulation experiments (OSSEs) in support of the future geostationary satellite constellation for tropospheric chemistry. It required 31 wall-time days on 4707 compute cores with only 24 % of the time spent on the GEOS-Chem chemical module. Results from the GEOS-5 Nature Run with GEOS-Chem chemistry were shown to be consistent to the offline GEOS-Chem CTM and were further compared to global and regional observations. The simulation shows no significant global bias for tropospheric ozone relative to the Ozone Monitoring Instrument (OMI) satellite and is highly correlated with observations spatially and seasonally. It successfully captures the ozone vertical distributions measured by ozonesondes over different regions of the world, as well as observations for ozone and its precursors from the August–September 2013 Studies of Emissions, Atmospheric Composition, Clouds and Climate Coupling by Regional Surveys (SEAC4RS) aircraft campaign over the southeast US. It systematically overestimates surface ozone concentrations by 10 ppbv at sites in the US and Europe, a problem currently being addressed by the GEOS-Chem CTM community and from which the GEOS ESM will benefit through the seamless update of the online code.