Positive trends in Southern Hemisphere carbonyl sulfide
Positive trends in Southern Hemisphere carbonyl sulfide
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DOI：
10.1002/2015gl065879
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发表时间：
2015-11
影响因子：
5.2
通讯作者：
S. Kremser;N. Jones;M. Palm;B. Lejeune;Yuting Wang;D. Smale;N. Deutscher
中科院分区：
文献类型：
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作者：
S. Kremser;N. Jones;M. Palm;B. Lejeune;Yuting Wang;D. Smale;N. Deutscher
硫化羰（OCS）从对流层到平流层的传输为平流层气溶胶层提供了硫，该层反射入射的短波太阳辐射，冷却气候系统。以前对外大陆架观测结果的分析没有显示出明显的趋势，这表明外大陆架不太可能是所报告的平流层气溶胶负荷增加的主要原因，并表明外大陆架预算是平衡的。在这里，我们提出了基于地面的傅里叶变换光谱仪测量的OCS在南半球的三个网站跨越34.45°S至77.80°S的分析。从2001年至2014年，在所有三个研究中心均观察到统计学显著的正趋势，观察到卧龙岗总柱OCS的总体趋势为0.73 ± 0.03%/年，Lauder为0.43 ± 0.02%/年，Arrival Heights为0.45 ± 0.05%/年。观测到的外大陆架的这些趋势意味着外大陆架的预算并不平衡，可能会对目前对源和汇的估计造成限制。
Transport of carbonyl sulfide (OCS) from the troposphere to the stratosphere contributes sulfur to the stratospheric aerosol layer, which reflects incoming short‐wave solar radiation, cooling the climate system. Previous analyses of OCS observations have shown no significant trend, suggesting that OCS is unlikely to be a major contributor to the reported increases in stratospheric aerosol loading and indicating a balanced OCS budget. Here we present analyses of ground‐based Fourier transform spectrometer measurements of OCS at three Southern Hemisphere sites spanning 34.45°S to 77.80°S. At all three sites statistically significant positive trends are seen from 2001 to 2014 with an observed overall trend in total column OCS at Wollongong of 0.73 ± 0.03%/yr, at Lauder of 0.43 ± 0.02%/yr, and at Arrival Heights of 0.45 ± 0.05%/yr. These observed trends in OCS imply that the OCS budget is not balanced and could contribute to constraints on current estimates of sources and sinks.