A Comparative Study of the Atmospheric Sulfur Budget in Different Natural Environments

私家侦探计划进行实地研究，重点是：（a） 生物圈-大气交换羰基硫（COS）， 二硫化碳（CS2）在大陆地区，和（B） 二甲基硫醚（CH 2SCH 3，DMS）的光化学氧化 海洋对流层 这两个过程都是 硫的地球化学循环 对全球气候调节的影响。 汇率 植物（和土壤）之间的COS、CS2和二氧化碳（CO2）， 大气将按昼夜和季节进行测量 在不同的自然环境中，包括火炬松， 一个橡树-山核桃林，和不同的农业生物群落 各种作物（小麦、玉米、大豆、高粱）。 一 将使用不同方法的组合，包括 梯度通量技术和封闭室（使用环境空气 或掺硫的零空气作为吹扫气）。 化学研究 二甲基硫醚在沿海和公海沃茨的转化将 也可以按昼夜和季节进行。 的主要部分 该计划将包括合作测量， 高灵敏度的新技术， 检测DMS、主要氧化剂如羟基（OH）和 氢过氧自由基（HO 2）和主要的DMS氧化产物 二甲基亚砜（DMSO）、二氧化硫（SO2）和气相 甲磺酸（MSA）和硫酸。 目标是 提高我们对COS，CS2， 和二甲基硫醚，以响应生物和气象因素。

The P.I. plans to conduct field studies focused on (a) the biosphere-atmosphere exchange of carbonyl sulfide (COS) and carbon disulfide (CS2) over continental areas, and (b) the photochemical oxidation of dimethylsulfide (CH2SCH3, DMS) in the marine troposphere. Both processes are important components of the biogeochemical sulfur cycle with potentially large implications for global climate regulation. Exchange rates of COS, CS2, and carbon dioxide (CO2) between plants (and soils) and the atmosphere will be measured on a diurnal and seasonal basis in different natural environments including a loblolly pine forest, an oak-hickory forest, and different agricultural biomes with various types of crops (wheat, corn, soybeans, sorghum). A combination of different methods will be used including the gradient flux technique and enclosure chambers (using ambient air or sulfur-spiked zero air as sweep gas). Studies of the chemical transformation of DMS over coastal and open ocean waters will also be made on a diurnal and seasonal basis. A major part of this program will consist of collaborative measurements involving new, highly sensitive techniques for continuous real-time detection of DMS, major oxidants such as the hydroxy (OH) and hydroperoxy radicals (HO2), and the major DMS oxidation products dimethysulfoxide (DMSO), sulfur dioxide (SO2), and gas phase methanesulfonic acid (MSA) and sulfuric acid. The goal is to enhance our understanding of the atmospheric cycles of COS, CS2, and DMS, in response to biological and meteorological factors.