Implications of energetic particle precipitation events for the temperature and dynamics of the atmosphere - a model study

高能粒子降水事件对大气温度和动力学的影响——模型研究

• 批准号: 182650365
• 负责人: Professor Dr. Justus Notholt
• 金额: --
• 依托单位: Institut für Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/182650365?language=en
• 关键词: Implications; energetic; particle; precipitation; events

The idea of this project is to investigate the thermal and dynamical changes related to large energetic particle precipitation events. Energetic particle precipitation influences the heating and cooling rates of the middle and upper atmosphere directly by different processes at different altitudes: (i) by Joule heating in the thermosphere and upper mesosphere, (ii) by chemical heating in the upper mesosphere, and (iii) due to radiative heating and cooling of ozone in the mesosphere and upper stratosphere. While the first two effects are fairly short-lived and will impact the atmosphere only during the particle event, the last effect, based on ozone loss, can continue for several weeks to months and propagate down into the mid-stratosphere during polar winter. Changes in heating / cooling rates will affect the temperature, and therefore also the large-scale circulation and wave-propagation in the middle atmosphere. While energetic particle precipitation events are well known to greatly disturb the chemical composition of the middle atmosphere, little is known about their potential to influence atmospheric temperatures and dynamics on seasonal or even longer time scales. However, a better understanding of these processes could be relevant for climate models. We propose to use the Bremen 3d CTM to calculate changes of the chemical composition of the middle atmosphere related to large energetic particle events for the period 1997 - 2007. From these results, changes to the radiative and chemical heating rates in the middle atmosphere will be derived and imposed onto the mechanistic general circulation model KMCM to assess the impact of these changes on atmospheric temperatures and dynamics.

该项目的想法是研究与大型颗​​粒降水事件有关的热和动态变化。能量颗粒的降水直接通过不同高度的不同过程来影响中间和上层大气的加热和冷却速率：（i）在热层和上层中的joule加热，（ii）（ii）在上层中的上层中的化学加热，以及（iii），（iii）由于辐射性和摩z酮在摩sosphere和termosephere and Mesoseospher and Mesosephere and Mesosephere and ozose的辐射加热和冷却而引起的。虽然前两个效应是相当短的，并且只有在粒子事件期间才会影响大气，但基于臭氧损失的最后效果可以持续数周到几个月，并在极地冬季传播到层流中期。加热 /冷却速率的变化将影响温度，因此也会影响中间大气中的大规模循环和波传播。众所周知，众所周知，众所周知，众所周知，中间大气的化学成分众所周知，但对它们影响大气温度和季节性甚至更长的时间尺度的动态的潜力知之甚少。但是，对这些过程的更好理解可能与气候模型有关。我们建议使用布雷蒙3D CTM计算与1997年至2007年期间的大气粒子事件相关的中间气氛的化学组成的变化。从这些结果中，将在中间大气中的辐射和化学加热速率变化，并将其强加于机械性的一般循环模型KMCM上，以评估这些对大气和动态的影响。