Intercomparison of Atmospheric Carbonyl Sulfide (TransCom-COS): 2. Evaluation of Optimized Fluxes Using Ground-Based and Aircraft Observations
Intercomparison of Atmospheric Carbonyl Sulfide (TransCom-COS): 2. Evaluation of Optimized Fluxes Using Ground-Based and Aircraft Observations
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DOI：
10.1029/2023jd039198
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发表时间：
2023-09-27
影响因子：
4.4
通讯作者：
Krol，Maarten C.
中科院分区：
文献类型：
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作者：
Ma，Jin;Remaud，Marine;Krol，Maarten C.
我们比较了几种模拟羰基硫化物(COS)的大气输送模型。这是正在进行的大气输送模式对比项目(TransCOM-COS)的第二部分。与第一部分不同，我们通过在TM5-4DVAR和LMDZ模式中传输NOAA地面数据的两个最新的COS反演来关注七个模式的相互比较。TransCOM-COS第二部分的主要目标是：(A)将使用两套优化通量的COS模拟与使用控制情景的模拟进行比较(第一部分)和(B)利用来自各种来源的飞机观测来评估模拟的对流层COS丰度。根据垂直混合强度将7个输运模型的输出进行分组：强混合和弱混合。结果表明，各种输送模式都较好地反映了COS在地表的经向分布。模型模拟通常与HIAPER极地观测(HIPPO)和大气层析任务(ATOM)的飞机活动相匹配。与河马和ATOM的比较表明，在0-40°N的太平洋上空，观测到的COS与模拟的COS之间存在差距，这表明自由对流层可能缺少源。通过模拟很好地再现了生物圈对河马和海洋上的原子吸收季节性大陆COS的影响。我们发现，柱子内垂直混合的强度，如各种大气传输模型所表示的，解释了模型与模型之间的大部分差异。我们还发现，输送由强混合TM5模式得到的最优通量的弱混合模式在高纬度表现出太强的季节循环。
We present a comparison of atmospheric transport models that simulate carbonyl sulfide (COS). This is part II of the ongoing Atmospheric Transport Model Inter‐comparison Project (TransCom–COS). Differently from part I, we focus on seven model intercomparison by transporting two recent COS inversions of NOAA surface data within TM5‐4DVAR and LMDz models. The main goals of TransCom‐COS part II are (a) to compare the COS simulations using the two sets of optimized fluxes with simulations that use a control scenario (part I) and (b) to evaluate the simulated tropospheric COS abundance with aircraft‐based observations from various sources. The output of the seven transport models are grouped in terms of their vertical mixing strength: strong and weak mixing. The results indicate that all transport models capture the meridional distribution of COS at the surface well. Model simulations generally match the aircraft campaigns HIAPER Pole‐To‐Pole Observations (HIPPO) and Atmospheric Tomography Mission (ATom). Comparisons to HIPPO and ATom demonstrate a gap between observed and modeled COS over the Pacific Ocean at 0–40°N, indicating a potential missing source in the free troposphere. The effects of seasonal continental COS uptake by the biosphere, observed on HIPPO and ATom over oceans, is well reproduced by the simulations. We found that the strength of the vertical mixing within the column as represented in the various atmospheric transport models explains much of the model to model differences. We also found that weak‐mixing models transporting the optimized flux derived from the strong‐mixing TM5 model show a too strong seasonal cycle at high latitudes.