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Total ozone trends from 1979 to 2016 derived from five merged observational datasets – the emergence into ozone recovery

机译：1979年至2016年臭氧总量趋势来自五个合并的观测数据集-臭氧恢复的出现

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We report on updated trends using different merged datasets from satellite and ground-based observations for the period from 1979 to 2016. Trends were determined by applying a multiple linear regression (MLR) to annual mean zonal mean data. Merged datasets used here include NASA MOD v8.6 and National Oceanic and Atmospheric Administration (NOAA) merge v8.6, both based on data from the series of Solar Backscatter UltraViolet (SBUV) and SBUV-2 satellite instruments (1978–present) as well as the Global Ozone Monitoring Experiment (GOME)-type Total Ozone (GTO) and GOME-SCIAMACHY-GOME-2 (GSG) merged datasets (1995–present), mainly comprising satellite data from GOME, the Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY), and GOME-2A. The fifth dataset consists of the monthly mean zonal mean data from ground-based measurements collected at World Ozone and UV Data Center (WOUDC). The addition of four more years of data since the last World Meteorological Organization (WMO) ozone assessment (2013–2016) shows that for most datasets and regions the trends since the stratospheric halogen reached its maximum (～?1996 globally and ～?2000 in polar regions) are mostly not significantly different from zero. However, for some latitudes, in particular the Southern Hemisphere extratropics and Northern Hemisphere subtropics, several datasets show small positive trends of slightly below +1?%?decadesup?1/sup that are barely statistically significant at the 2iσ/i uncertainty level. In the tropics, only two datasets show significant trends of +0.5 to +0.8?%?decadesup?1/sup, while the others show near-zero trends. Positive trends since 2000 have been observed over Antarctica in September, but near-zero trends are found in October as well as in March over the Arctic. Uncertainties due to possible drifts between the datasets, from the merging procedure used to combine satellite datasets and related to the low sampling of ground-based data, are not accounted for in the trend analysis. Consequently, the retrieved trends can be only considered to be at the brink of becoming significant, but there are indications that we are about to emerge into the expected recovery phase. However, the recent trends are still considerably masked by the observed large year-to-year dynamical variability in total ozone.
机译：我们报告了1979年至2016年期间使用来自卫星和地面观测的不同合并数据集的更新趋势。趋势是通过将多元线性回归（MLR）应用于年度平均纬向平均数据来确定的。此处使用的合并数据集包括NASA MOD v8.6和美国国家海洋与大气管理局（NOAA）合并v8.6，这两个数据都是基于太阳反向散射紫外线（SBUV）和SBUV-2卫星仪器（1978年至今）系列数据得出的。以及全球臭氧监测实验（GOME）型总臭氧（GTO）和GOME-SCIAMACHY-GOME-2（GSG）合并数据集（1995年至今），主要包括来自国美的卫星数据，大气扫描成像吸收光谱仪制图（SCIAMACHY）和GOME-2A。第五个数据集由世界臭氧和紫外线数据中心（WOUDC）收集的地面测量的月平均纬向平均数据组成。自上一次世界气象组织（WMO）臭氧评估（2013-2016年）以来，再增加了四年的数据表明，对于大多数数据集和区域，自平流层卤素达到最大值以来的趋势（全球〜1996年，2000年〜2000年）。极数区域）与零之间的差异不大。但是，对于某些纬度，特别是南半球的温带热带和北半球的亚热带，一些数据集显示略微低于+1？％？decade ？1 的小正趋势，而在2 < i>σ不确定性级别。在热带地区，只有两个数据集显示趋势为+0.5到+0.8？％？decade ？1 ，而其他数据集则显示接近零的趋势。自2000年以来，九月在南极观测到了积极的趋势，但十月和三月在北极发现了接近零的趋势。趋势分析中未考虑由于数据集之间可能存在的漂移而导致的不确定性，这些不确定性来自用于合并卫星数据集的合并过程，并且与基于地面的数据的采样率较低有关。因此，所检索到的趋势只能视为正处于重要的边缘，但是有迹象表明我们即将进入预期的恢复阶段。但是，最近的趋势仍然被所观察到的总臭氧量逐年较大的动态变化所掩盖。

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