Observed changes in Brewer?Dobson circulation for 1980?2018
Observed changes in Brewer?Dobson circulation for 1980?2018
复制标题
DOI：
10.1088/1748-9326/ab4de7
复制
发表时间：
2019-11-01
影响因子：
6.7
通讯作者：
Lin, Pu
中科院分区：
文献类型：
--
作者：
Fu, Qiang;Solomon, Susan;Lin, Pu
先前的工作根据卫星微波探测装置（MSU/AMSU）低平流层温度（T-LS）观测和ERA-中期再分析数据，研究了1980年至2009年布鲁尔·多布森环流（BDC）的变化。在这里，我们检查了现有较长时期（1980年至2018年）的BDC变化，这也允许分析臭氧消耗（1980年至1999年）和臭氧修复（2000年至2018年）时期。我们提供的观测证据表明，年平均 BDC 在 1980 年至 1999 年加速，但在 2000 年至 2018 年减速，其变化主要由南半球 (SH) 驱动，部分原因可能是臭氧消耗和愈合的影响。我们还表明，年度平均 BDC 在过去 40 年中有所加速（在 90% 的置信水平下），每十年相对增强 1.7%。这种总体加速是由北半球 (40%) 和南半球 (60%) 细胞推动的。在排除2002年发生的非常罕见的南半球平流层突然变暖之后，2000年至2018年9月南半球辐射变暖也被确定为显着，这支持了南极臭氧层在9月开始愈合的观点。
Previous work has examined the Brewer?Dobson circulation (BDC) changes for 1980?2009 based on satellite Microwave Sounding Unit (MSU/AMSU) lower-stratospheric temperature (T-LS) observations and ERA-Interim reanalysis data. Here we examine the BDC changes for the longer period now available (1980?2018), which also allows analysis of both the ozone depletion (1980?1999) and ozone healing (2000?2018) periods. We provide observational evidence that the annual mean BDC accelerated for 1980?1999 but decelerated for 2000?2018, with the changes largely driven by the Southern Hemisphere (SH), which might be partly contributed by the effects of ozone depletion and healing. We also show that the annual mean BDC has accelerated in the last 40 years (at the 90% confidence level) with a relative strengthening of ?1.7% per decade. This overall acceleration was driven by both Northern Hemisphere (40%) and SH (60%) cells. Significant SH radiative warming is also identified in September for 2000?2018 after excluding the year 2002 when a very rare SH stratospheric sudden warming occurred, supporting the view that healing of the Antarctic ozone layer has now begun to occur during the month of September.