文献类型：期刊文献

英文题名：Hemispherical scale mechanisms of nitrate formation in global marine aerosols

作者：Lao, Qibin[1];Li, Hongliang[2];Yan, Jinpei[3];Jin, Guangzhe[1,4];He, Guirong[1];Chen, Chunqing[1];Zhu, Qingmei[1,4];Chen, Fajin[1,4]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Zhanjiang, Peoples R China;[2]Minist Nat Resources, Inst Oceanog 2, Key Lab Marine Ecosyst Dynam, Hangzhou, Peoples R China;[3]Minist Nat Resources, Key Lab Global Change & Marine Atmospher Chem, Xiamen, Peoples R China;[4]Guangdong Ocean Univ, Key Lab Climate Resources & Environm Continental S, Dept Educ Guangdong Prov, Zhanjiang, Peoples R China

年份：2024

卷号：7

期号：1

外文期刊名：NPJ CLIMATE AND ATMOSPHERIC SCIENCE

收录：SCI-EXPANDED(收录号：WOS:001250554800001)、、Scopus(收录号：2-s2.0-85196269298)、WOS

基金：This study was supported by the National Natural Science Foundation of China (U1901213, 92158201, 42276047, 42176039), Global Change and Air-Sea Interaction II Program (GASI-01-EIND-STwin), and Innovation and Entrepreneurship Project of Shantou (2021112176541391).

语种：英文

外文摘要：Nitrogen oxides (NOx) in the atmosphere directly affect air quality; however, their oxidation products (e.g., nitrate) are essential nutrients in terrestrial and marine ecosystems. To date, the mechanism and rate of nitrate formation in the global-scale marine boundary layer remains uncertain. Herein, aerosol nitrate isotopes covering the global ocean were analysed and observations indicated that nitrate formation was dominated by the proportion between the hydroxyl radical (daytime) and ozone (nighttime) pathways in the Northern Hemisphere (NH), whereas it changed to the BrO (Antarctic iceberg emission) pathway in the Southern Hemisphere (SH). These differences in the pathways suggested that the NOx removal (nitrate formation) efficiency was higher in the NH, which could be responsible for the much higher nitrate concentrations in the NH than in the SH (over twice). This study can assist in formulating effective policies to mitigate global NOx pollution and improve our understanding of the impact of increasing NOx concentrations on global ocean productivity.