A Global 1 Degree by 1 Degree Distribution of Atmospheric/Soil CO2 Consumption by Continental Weathering and of Riverine HCO3 Yield (DB1012)

The mission of the Centre National de la Recherche Scientifique (CNRS) of Strasbourg Cedex, France is to study "The Global Carbon Cycle and its Perturbation by Man and Climate, the Terrestrial Biosphere". With the support of the Environment Programme of the European Communities, modeling of the spatial distribution of atmospheric-soil CO2 consumption by chemical weathering of continental rocks have been and are being conducted. One of the major results of these studies is a set of global maps which show the distribution of CO2 consumption (FCO2) and the transport of bicarbonate (FHCO3-) from rivers to the ocean, each in moles per kilometer squared per year (mol km2/yr). Continental weathering influences the geologic carbon cycle (Trabalka, 1985). The largest natural exchange fluxes of carbon occur between the atmosphere and the terrestrial biota, and between the atmosphere and the ocean surface waters (Houghton, et. al. 1990). River carbon input to the oceans is a component of the estimate of global air-sea CO2 fluxes (Sarminento and Sundquist 1992). It is estimated that about 0.3 gigatons of carbon per year (GtC/yr) are consumed by the chemical erosion of continental rocks and transferred as HCO3- to the oceans (Berner et. al. 1983; Meybeck 1987; and Probst 1992), while the flux of particulate and dissolved organic carbon transported by rivers to the oceans is estimated to be about 0.4 GtC/yr (Probst 1992). On the whole, about 0.7 GtC/yr are transferred by continental erosion from the soil-biosphere reservoir to the oceans. A model developed by Amiotte Suchet and Probst (1993) calculates the flux of atmospheric-soil CO2 consumed by the chemical erosion of continental rock (i.e., rock weathering) and the bicarbonate river transfer to the ocean. This model is based on a set of empirical relationships between FCO2 and the drainage (runoff) on the major rock types outcropping on the continents. The model assumes that the consumption of atmospheric CO2 by continental weathering is primarily influenced by drainage, and the different types of rocks outcropping the continents. This data base contains estimates of the net flux of atmospheric-soil CO2 (FCO2) produced by the Amiotte Suchet and Probst model and the associated bicarbonate river flux (FHCO3-). These variables are referenced to a 1 degree latitude by 1 degree longitude world grid. The grid contains 64,800 records (i.e. grid cells) originating at -180 degrees West longitude by -90 degrees North latitude, and extending to 180 degrees West longitude by 90 degrees North latitude.

法国斯特拉斯堡塞德克斯的法国国家科学研究中心（Centre National de la Recherche Scientifique，CNRS）的研究使命为"全球碳循环及其受人类活动与气候的扰动效应，以及陆地生物圈"。在欧洲共同体环境规划署的支持下，相关团队已开展并仍在推进针对大陆岩石化学风化作用所消耗的大气-土壤CO₂的空间分布建模研究。此项研究的核心成果之一为一套全球地图集，直观展示了CO₂消耗量（FCO2）以及碳酸氢盐（FHCO3-）经河流向海洋的输送通量，二者的单位均为摩尔每平方千米每年（mol·km⁻²·yr⁻¹）。大陆风化作用会影响地质碳循环（Trabalka，1985）。碳的最大自然交换通量发生在大气与陆地生物群落之间，以及大气与海洋表层水体之间（Houghton等，1990）。河流向海洋输入的碳量是全球海-气CO₂通量估算的组成部分之一（Sarminento与Sundquist，1992）。据估算，每年约有0.3吉吨碳（GtC/yr）经大陆岩石化学侵蚀作用被消耗，并以HCO3-的形式输送至海洋（Berner等，1983；Meybeck，1987；Probst，1992）；与此同时，经河流向海洋输送的颗粒态与溶解态有机碳通量约为0.4 GtC/yr（Probst，1992）。总体而言，每年约有0.7吉吨碳经大陆侵蚀作用从土壤-生物圈储库输送至海洋。Amiotte Suchet与Probst（1993）开发的模型可计算大陆岩石化学侵蚀（即岩石风化作用）所消耗的大气-土壤CO₂通量，以及经河流向海洋输送的碳酸氢盐通量。该模型基于FCO2与大陆出露主要岩石类型的汇水（径流）量之间的一系列经验关系。该模型假设，大陆风化作用对大气CO₂的消耗主要受汇水量以及大陆出露的不同岩石类型的影响。本数据集包含由Amiotte Suchet与Probst模型生成的大气-土壤CO₂净通量（FCO2）以及相关的河流碳酸氢盐通量（FHCO3-）的估算值。上述变量均基于1°纬度×1°经度的全球网格进行空间参考。该网格共计包含64800条记录（即网格单元），其覆盖范围始于西经180°、南纬90°，延伸至西经180°、北纬90°。