Volatile organic iodine compounds (VOICs) such as di-iodomethane (CH₂I₂) released from the ocean are important vectors of iodine in the atmosphere and play an important role in atmospheric chemistry. In temperate ocean waters, several studies observed or presumed CH₂I₂ production. Here, we investigated the ability of temperate marine phytoplankton to produce VOICs in a culture experiment. To evaluate the decrease of ¹³CH₂I₂ by photolysis and release during sampling, we also performed an incubation experiment involving the addition of ¹³CH₂I₂ to the f/2-Si medium. Axenic cultures of B. natans in f/2-Si medium showed no production of CH₂I₂, but axenic cultures of B. natans in phosphorus-deficient cultures and nitrogen-deficient cultures exhibited remarkable rates of CH₂I₂ production: 5.3–5.9 pmol (μg chlorophyll a)⁻¹ d⁻¹ and 0.8–1.3 pmol (μg chlorophyll a)⁻¹ d⁻¹, respectively. Similarly, the production of chloroiodomethane (CH₂ClI) and bromoiodomethane (CH₂BrI) was observed in phosphorus- or nitrogen-deficient cultures, but not in f/2-Si culture. Higher production rates of CH₂I₂, CH₂ClI, and CH₂BrI were observed during the early exponential phase of B. natans cultures. The relative concentration ratio of CH₂I₂, CH₂ClI, and CH₂BrI in the B. natans cultures were approximately 70:8:1 and 15:10:1 in the phosphorus-deficient and nitrogen-deficient cultures, respectively. Based on the results of the addition of ¹³CH₂I₂ in a culture experiment, we estimated that CH₂I₂ was decreased by approximately 8.6% due to photolysis and volatilization during the fifth and tenth day, during which time CH₂I₂ production was observed in B. natans cultures in f/2-Si with a half-concentration of phosphorus. These results suggested that a nutrient deficiency could induce the production of VOICs derived from temperate marine phytoplankton such as B. natans and that nutritional conditions are one of the important factors for the estimation of VOIC emissions from temperate open ocean.

从海洋释放的挥发性有机碘化合物（VOIC），例如二碘甲烷（CH ₂ I ₂）是大气中碘的重要载体，并且在大气化学中起着重要作用。在温带海洋水域中，有几项研究观察到或推测了CH ₂ I _2的产生。在这里，我们通过培养实验研究了温带海洋浮游植物产生VOIC的能力。为了评估在采样过程中光解和释放引起的¹³ CH ₂ I ₂减少，我们还进行了涉及添加¹³ CH ₂ I ₂的孵育实验到f / 2-Si介质。的纯性培养物B.苹在F / 2硅介质没有显示出生产的CH ₂我₂，但纯性培养物B.苹在磷缺陷型培养物和氮型培养物显示出CH的显着的速率₂我₂生产：5.3分别为–5.9 pmol（μg叶绿素a）^-1 d ^-1和0.8–1.3 pmol（μg叶绿素a）^-1 d ^-1。同样，氯碘甲烷（CH ₂ ClI）和溴碘甲烷（CH ₂BrI）在磷或氮缺乏的培养物中观察到，但在f / 2-Si培养物中则未观察到。在纳豆芽孢杆菌培养的指数期早期，观察到较高的CH ₂ I ₂，CH ₂ ClI和CH ₂ BrI生产率。B. natans培养物中CH ₂ I ₂，CH ₂ ClI和CH ₂ BrI的相对浓度比分别在缺磷和缺氮培养物中分别约为70：8：1和15：10：1。根据添加¹³ CH ₂ I _2的结果在培养实验中，我们估计，CH ₂我₂是由于在第五和第十天光解和挥发，在此期间CH减少约8.6％₂我₂中观察到的生产B.苹培养物在F / 2- Si具有一半浓度的​​磷。这些结果表明，营养缺乏会诱导温带海洋浮游植物（如B. natans）衍生出VOIC ，而营养条件是估计温带开放海洋VOIC排放的重要因素之一。