VOCALS: Atmospheric Sulfur Chemistry in the South East Pacific

本研究的重点是2008年VOCALS-REx（VAMOS海洋-云-大气-陆地研究区域实验）项目期间东南太平洋（SEP）上空的气相硫测量。 硫的化学性质及其对控制SEP中云特性的过程的影响将通过大气压电离质谱法快速测量二甲硫醚（DMS）和二氧化硫（SO2）进行研究;将获得这些物质的浓度和垂直通量。 研究人员将研究从多云到无云条件过渡期间发生的光化学变化。 一个主要的目标是评估气溶胶的增长，云的形成和降水的化学过程的背景下，在VOCALS获得的其他物理和化学数据，以更好地了解控制层积云的静态和动态特性的因素。 这些数据还将用于确定人为和自然硫气体源的相对作用，这项研究将有助于阐明背景大气中硫化学对气候的影响。 其中一些结果将用于大气化学和动力学研究生课程。 一名研究生将通过该项目得到支持。

The focus of this research is on gas-phase sulfur measurements over the southeast Pacific (SEP) during the 2008 VOCALS-REx (VAMOS Ocean-Cloud-Atmosphere-Land Study Regional Experiment) project. The chemistry of sulfur and its influence on processes controlling cloud properties in the SEP will be studied with fast measurements of dimethylsulfide (DMS) and sulfur dioxide (SO2) by atmospheric pressure ionization mass spectrometry; both concentrations and vertical fluxes of these species will be obtained. The investigators will study the changes in photochemistry occurring during transitions from cloudy to cloud-free conditions. A major goal is to evaluate the chemical processes of aerosol growth, cloud formation, and precipitation in the context of other physical and chemical data obtained in VOCALS, in order to better understand the factors controlling the static and dynamic properties of stratocumulus clouds. The data will also be used to identify the relative roles of anthropogenic and natural sources of sulfur gases.This research will help to elucidate the impact of sulfur chemistry on climate in the background atmosphere. Some of the results will be used in graduate courses on atmospheric chemistry and kinetics. One graduate student will be supported through this project.