证据表明,南太平洋的海洋微生物驱动的以酸盐为基础的夜间大气核形成
Guillaume Chamba1, Matti Rissanen2,3, Theresa Barthelmeß4
1Université Clermont Auvergne, CNRS, Laboratoire de Météorologie Physique, Clermont-Ferrand F-63000, France.
概括
海洋生物的排放可以在开放的海洋大气中形成新的粒子. 这些新的粒子形成事件与酸盐离子有关,这表明海洋生物地球化学循环在气候调节中的新角色.
科学领域:
- 大气化学 大气化学
- 海洋学 海洋学 海洋学
- 气候科学 气候科学
背景情况:
- 海洋云相互作用对气候调节至关重要.
- 海洋生物排放在大气新粒子形成 (NPF) 中的作用仍然不清楚.
- 了解原始海洋环境中的NPF通路对于准确的气候模型至关重要.
研究的目的:
- 调查生物源海洋排放是否在开放的海洋大气中形成新的颗粒.
- 为了确定在这个环境中负责NPF的化学物种.
- 探索浮游生物,生物地球化学循环和NPF之间的联系.
主要方法:
- 船载空海接口坦克被部署在西南太平洋.
- 测量重点是夜间新粒子形成 (NPF).
- 化学物种的丰度与NPF率和颗粒度相关.
主要成果:
- 新粒子形成 (NPF) 事件在夜间被确定.
- 核菌菌率与浮游生物群落组成有很强的相关性.
- 酸盐离子被确定为在实验中支持NPF的关键物种,并且在自然大气中高颗粒度时升高.
结论:
- 生物性海洋排放,特别是与浮游生物相关的排放,可以导致公开海洋大气中的新粒子形成.
- 酸盐离子源于海洋生物地球化学循环,在气溶核形成中起到以前未知的作用.
- 这些发现为海洋-大气相互作用及其对气候的影响提供了新的视角.
相关概念视频
2° Amines to N-Nitrosamines: Reaction with NaNO2
4.3K
Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
4.3K
Overview of Nitrogen Metabolism
8.0K
Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of ammonia, ammonium ions, nitrate, nitrite, or nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
8.0K
Primary Production
23.6K
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
23.6K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism
3.8K
Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
3.8K
The Nitrogen Cycle
52.4K
Nitrogen atoms, present in all proteins and DNA, are recycled between abiotic and biotic components of the ecosystem. However, the primary form of nitrogen on Earth is nitrogen gas, which cannot be used by most animals and plants. Thus, nitrogen gas must first be converted into a usable form by nitrogen-fixing bacteria before it can be cycled through other living organisms. The use of nitrogen-containing fertilizers and animal waste products in human agriculture has greatly influenced the...
52.4K
1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview
3.3K
Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
3.3K


