Global Atmospheric OCS Trend Analysis From 22 NDACC Stations
Global Atmospheric OCS Trend Analysis From 22 NDACC Stations
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DOI：
10.1029/2021jd035764
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发表时间：
2022-02-27
影响因子：
4.4
通讯作者：
Wizenberg, Tyler
中科院分区：
文献类型：
--
作者：
Hannigan, James W.;Ortega, Ivan;Wizenberg, Tyler
羰基硫化物（OCS）是自由对流层中的一种非吸湿性痕量物质，是由直接海洋、地质、生物和人为排放以及其他含硫源物质的氧化维持的大型硫库。它是火山静止期向平流层输送硫的最大来源。来自22个地面全球分散站的数据被用来得出总柱和部分柱OCS的趋势。中红外光谱数据由太阳观测傅立叶变换干涉仪记录，该干涉仪作为1986年至2020年大气成分变化探测网络的一部分运行。检索剖面中的垂直信息提供了对离散的垂直区域的分析。趋势有明确的拐点。在类似于2002 - 2008年和类似于2008 - 2016年的两个线性趋势周期中，对流层趋势的变化范围从类似于0.0到（1.55 +/- 0.30%/年），而之前所有对流层趋势都为负。回归分析显示，自由对流层与人为排放的相关性最强。在与2008 - 2016年相似的时期，平流层趋势为正（1.93 +/- 0.26%/年），但明显低纬度站的平流层趋势为负。由于与2016年相似，所有台站都显示到2020年对流层自由减少。用同时测量的N2O对平流层OCS进行了回归，得出了一个考虑动力变率的趋势。平流层的寿命从副热带的（54.1 +/- 9.7）年到南极洲的（103.4 +/- 18.3）年不等。这些独特的长期测量为全球OCS预算提供了新的关键限制。
Carbonyl sulfide (OCS) is a non-hygroscopic trace species in the free troposphere and a large sulfur reservoir maintained by both direct oceanic, geologic, biogenic, and anthropogenic emissions and the oxidation of other sulfur-containing source species. It is the largest source of sulfur transported to the stratosphere during volcanically quiescent periods. Data from 22 ground-based globally dispersed stations are used to derive trends in total and partial column OCS. Middle infrared spectral data are recorded by solar-viewing Fourier transform interferometers that are operated as part of the Network for the Detection of Atmospheric Composition Change between 1986 and 2020. Vertical information in the retrieved profiles provides analysis of discreet altitudinal regions. Trends are found to have well-defined inflection points. In two linear trend time periods similar to 2002 to 2008 and similar to 2008 to 2016 tropospheric trends range from similar to 0.0 to (1.55 +/- 0.30%/yr) in contrast to the prior period where all tropospheric trends are negative. Regression analyses show strongest correlation in the free troposphere with anthropogenic emissions. Stratospheric trends in the period similar to 2008 to 2016 are positive up to (1.93 +/- 0.26%/yr) except notably low latitude stations that have negative stratospheric trends. Since similar to 2016, all stations show a free tropospheric decrease to 2020. Stratospheric OCS is regressed with simultaneously measured N2O to derive a trend accounting for dynamical variability. Stratospheric lifetimes are derived and range from (54.1 +/- 9.7)yr in the sub-tropics to (103.4 +/- 18.3)yr in Antarctica. These unique long-term measurements provide new and critical constraints on the global OCS budget.