A three-dimensional synthesis study of delta O-18 in atmospheric CO2 .2. Simulations with the TM2 transport model
A three-dimensional synthesis study of delta O-18 in atmospheric CO2 .2. Simulations with the TM2 transport model
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DOI：
10.1029/96jd02361
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发表时间：
1997-03-20
影响因子：
4.4
通讯作者：
Heimann, M
中科院分区：
文献类型：
--
作者：
Ciais, P;Tans, PP;Heimann, M
在本研究中，我们使用三维 (3-D) 示踪剂建模方法模拟大气 CO2 的 delta(18)O。在大气传输模型 TM2 中，我们规定了植被和土壤、海洋交换、化石排放和生物质燃烧引起的 O-18 表面通量。首先分别对每个水库进行模型模拟讨论，然后将所有水库组合起来，以便与美国国家海洋和大气管理局科罗拉多大学、斯克里普斯海洋学研究所-Centrum Voor Isotopen Onderzoek（美国-荷兰）和英联邦科学与工业研究组织（澳大利亚）空气采样计划进行的大气δ(18)O测量进行比较，深入了解纬度差异和季节周期CO2 中的 δ(18)O 是通过观察每个来源的贡献而获得的，与土壤的同位素交换引起北半球大陆上的大量同位素消耗，这克服了由于叶片交换而引起的同位素富集的并发效应，与陆地生物群相比，海洋通量和人为 CO2 源的影响相对较小，δ(18)O 中纬度剖面的形状似乎主要由呼吸作用决定陆地生物群，平衡一年内的光合作用吸收。有关陆地碳交换阶段的其他信息来自北高纬度地区 delta(18)O 的季节性循环。
In this study, using a three-dimensional (3-D) tracer modeling approach, we simulate the delta(18)O of atmospheric CO2. In the atmospheric transport model TM2 we prescribe the surface fluxes of O-18 due to vegetation and soils, ocean exchange, fossil emissions, and biomass burning. The model simulations are first discussed for each reservoir separately, then all the reservoirs are combined to allow a comparison with the atmospheric delta(18)O measurements made by the National Oceanic and Atmospheric Administration-University of Colorado, Scripps Institution of Oceanography-Centrum Voor Isotopen Onderzoek (United States-Netherlands) and Commonwealth Scientific and Industrial Research Organisation (Australia) air sampling programs, Insights into the latitudinal differences and into the seasonal cycle of delta(18)O in CO2 are gained by looking at the contribution of each source, The isotopic exchange with soils induces a large isotopic depletion over the northern hemisphere continents, which overcomes the concurrent effect of isotopic enrichment due to leaf exchange, Compared to the land biota, the ocean fluxes and the anthropogenic CO2 source have a relatively minor influence, The shape of the latitudinal profile in delta(18)O appears determined primarily by the respiration of the land biota, which balances photosynthetic uptake over the course of a year, Additional information on the phasing of the terrestrial carbon exchange comes from the seasonal cycle of delta(18)O at high northern latitudes.