Stratospheric temperature trends: impact of ozone variability and the QBO
Stratospheric temperature trends: impact of ozone variability and the QBO
复制标题
平流层温度趋势：臭氧变化和 QBO 的影响
DOI：
10.1007/s00382-009-0604-x
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发表时间：
2010
期刊：
影响因子：
4.6
通讯作者：
P. Stott
中科院分区：
文献类型：
--
作者：
M. Dall’Amico;L. Gray;K. Rosenlof;Adam A. Scaife;K. Shine;P. Stott
在政府间气候变化专门委员会2007年第四次评估报告所使用的大多数气候模拟中，平流层过程的代表性很差。例如，气候或简单的规格随时间变化的臭氧浓度和赤道平流层纬向风的准两年振荡（QBO）是缺席。在这里，我们调查的影响，一个改进的平流层表示使用两套扰动模拟与哈德利中心耦合海洋大气模型HadGEM 1与自然和人为强迫的1979-2003年期间。在第一组模拟中，通常的纬向平均臭氧气候与叠加趋势被替换为观测到的纬向平均臭氧分布的时间序列，其中包括与太阳周期，QBO和火山爆发相关的年际变化。除此之外，第二组扰动模拟包括一个方案，其中热带地区的平流层纬向风放宽到从ERA-40再分析获得的适当纬向平均值，从而迫使QBO。这两种变化都严格适用于平流层。臭氧场的改善导致对最近两次重大火山爆发后在平流层下部观察到的逐步温度转变的模拟得到改进。在臭氧场的太阳活动周期信号的贡献，这种改进的表示的逐步冷却进行了讨论。改进的臭氧场和准两年期振荡导致对全球和热带纬度观测趋势的模拟得到改进。在赤道地区平流层下部的欧拉上升流增强的臭氧场的改善和QBO松弛的影响，但都没有引起显着的变化的上升流的趋势。
In most climate simulations used by the Intergovernmental Panel on Climate Change 2007 fourth assessment report, stratospheric processes are only poorly represented. For example, climatological or simple specifications of time-varying ozone concentrations are imposed and the quasi-biennial oscillation (QBO) of equatorial stratospheric zonal wind is absent. Here we investigate the impact of an improved stratospheric representation using two sets of perturbed simulations with the Hadley Centre coupled ocean atmosphere model HadGEM1 with natural and anthropogenic forcings for the 1979–2003 period. In the first set of simulations, the usual zonal mean ozone climatology with superimposed trends is replaced with a time series of observed zonal mean ozone distributions that includes interannual variability associated with the solar cycle, QBO and volcanic eruptions. In addition to this, the second set of perturbed simulations includes a scheme in which the stratospheric zonal wind in the tropics is relaxed to appropriate zonal mean values obtained from the ERA-40 re-analysis, thus forcing a QBO. Both of these changes are applied strictly to the stratosphere only. The improved ozone field results in an improved simulation of the stepwise temperature transitions observed in the lower stratosphere in the aftermath of the two major recent volcanic eruptions. The contribution of the solar cycle signal in the ozone field to this improved representation of the stepwise cooling is discussed. The improved ozone field and also the QBO result in an improved simulation of observed trends, both globally and at tropical latitudes. The Eulerian upwelling in the lower stratosphere in the equatorial region is enhanced by the improved ozone field and is affected by the QBO relaxation, yet neither induces a significant change in the upwelling trend.
平流层变率对对流层气候变化的影响
影响因子：
4.6
作者：
Dall'Amico M
通讯作者：
Dall'Amico M