In this work, we describe the compilation and homogenization of an extensive data set of aerosol iodine field observations in the period between 1963 and 2018 and we discuss its spatial and temporal dependences by comparison with CAM‐Chem model simulations. A close to linear relationship between soluble and total iodine in aerosol is found (∼80% aerosol iodine is soluble), which enables converting a large subset of measurements of soluble iodine into total iodine. The resulting data set shows a distinct latitudinal dependence, with an enhancement toward the Northern Hemisphere (NH) tropics and lower values toward the poles. This behavior, which has been predicted by atmospheric models to depend on the global distribution of the main oceanic iodine source (which in turn depends on the reaction of ozone with aqueous iodide on the sea water‐air interface, generating gas‐phase I₂ and HOI), is confirmed here by field observations for the first time. Longitudinally, there is some indication of a wave‐one profile in the tropics, which peaks in the Atlantic and shows a minimum in the Pacific. New data from Antarctica show that the south polar seasonal variation of iodine in aerosol mirrors that observed previously in the Arctic, with two equinoctial maxima and the dominant maximum occurring in spring. While no clear seasonal variability is observed in NH middle latitudes, there is an indication of different seasonal cycles in the NH tropical Atlantic and Pacific. Long‐term trends cannot be unambiguously established as a result of inhomogeneous time and spatial coverage and analytical methods.

中文翻译：

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气溶胶中碘的时空变异性

在这项工作中，我们描述了1963年至2018年期间广泛的气溶胶碘现场观测数据集的汇编和均质化，并通过与CAM-Chem模型模拟进行了比较来讨论其空间和时间依赖性。发现气溶胶中的可溶性碘和总碘之间存在接近线性关系（约80％的气溶胶碘是可溶性的），这可以将大量的可溶性碘测量值转换为总碘。所得数据集显示出明显的纬度依赖性，北半球（NH）热带地区增强，而两极地区值较低。这种行为，₂和HOI），这是首次通过现场观察得到证实。从纵向上看，在热带地区有波状剖面的迹象，该剖面在大西洋达到顶峰，而在太平洋则显示为最小。来自南极洲的新数据显示，以前在北极观察到的气溶胶镜中碘的南极季节性变化，其中两个等值最大值出现在春季。尽管在新罕布什尔州中纬度地区未观察到明显的季节性变化，但有迹象表明新罕布什尔州热带大西洋和太平洋地区有不同的季节周期。由于时间和空间覆盖范围以及分析方法的不统一，无法明确确定长期趋势。