...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >TIMESCALES FOR THE STRATOSPHERIC CIRCULATION DERIVED FROM TRACERS
【24h】

TIMESCALES FOR THE STRATOSPHERIC CIRCULATION DERIVED FROM TRACERS

机译：从示踪剂得出的气旋循环时间表

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A class of atmospheric constituents used as tracers of stratospheric flow are chemically long-lived in comparison with timescales of interest and exhibit gradients due primarily to time-dependent mixing ratios at the tropopause. In general, the stratospheric transport properties derived from such tracers depend on the nature of their time variation. To explore the relationship between timescales associated with the propagation of tracer mixing ratio signals and bulk transport properties, we have used two three-dimensional chemical transport models to simulate the age spectrum (the distribution of transit times of mass present in air parcels) of the stratosphere. From the age spectrum the stratospheric response to any time-varying tropospheric forcing may be deduced. The modeled age spectra are broad, indicating a range of transit times present in air parcels, and asymmetric, so that the mean transit time, called the mean age, is much larger than the modal transit time. Furthermore, the phase lag time of an oscillating signal (e.g., the annual CO2 cycle and lower stratospheric H2O) and the mean age are not timescales characterizing the same transport property. Periodic signal phase lags do not represent ''mean transit times'' and, in general, cannot be readily related to bulk transport properties. However, if the age spectrum is peaked enough, as it appears to be in the lower tropical stratosphere, periodic signal phase lags approximate the modal time. [References: 37]
机译：与感兴趣的时间尺度相比，用作平流层流示踪剂的一类大气成分在化学上是长寿的，并且主要由于对流层顶的时间依赖性混合比而表现出梯度。通常，从此类示踪剂得出的平流层传输特性取决于其时间变化的性质。为了探索与示踪剂混合比信号的传播相关的时标与整体运输性能之间的关系，我们使用了两个三维化学运输模型来模拟该船的年龄谱（空气中存在的质量传递时间的分布）。平流层。从年龄谱可以推断出平流层对任何随时间变化的对流层强迫的响应。建模的年龄谱很宽，表明存在于飞机包裹中的渡越时间范围是不对称的，因此平均渡越时间（称为平均年龄）远大于模态渡越时间。此外，振荡信号的相位滞后时间（例如，年度CO2周期和较低的平流层H2O）和平均年龄并不是表征相同输运特性的时标。周期性信号相位滞后不代表“平均渡越时间”，并且通常不容易与散装运输特性相关。但是，如果年龄谱图达到了足够高的峰值，因为它似乎位于热带低空平流层，则周期性的信号相位滞后接近模态时间。 [参考：37]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号