Trajectory mapping of middle atmospheric water vapor by a mini network of NDACC instruments
Trajectory mapping of middle atmospheric water vapor by a mini network of NDACC instruments
复制标题
通过 NDACC 仪器小型网络绘制中层大气水蒸气轨迹图
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
J. Oh
中科院分区：
文献类型：
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作者：
M. Lainer;N. Kämpfer;Brigitte Tschanz;G. Nedoluha;Soohyun Ka;J. Oh
抽象的。大气中层痕量气体（如水汽或臭氧）的全球覆盖观测任务通常由卫星完成。气候和大气研究依赖于对整个平流层和中间层的痕量气体分布的了解。这些气体中的许多目前都是通过卫星测量的，但尚不清楚未来是否会保持这种能力。这可能导致对大气层状况的重大知识空白。利用拉格朗日轨道计算和5个地面微波辐射计的水汽廓线数据，探讨了在北方半球测绘中层大气水汽的可能性。其中四个是在NDACC（大气成分变化探测网络）框架内运行的。请记住，这些仪器是基于不同的硬件和校准设置，一个高度依赖的偏差检索的水汽廓线之间的微波辐射计预期。为了校正和协调不同的数据集，使用Aura卫星上的微波临边探测器（MLS）作为一种旅行标准。一个域平均TM（轨迹映射）的方法，简化了随后的验证的质量的直接卫星观测的水汽分布映射。使用6小时气象风分析场，在长达10天的时间内向前和向后计算轨迹。总体而言，共四个案例研究的轨迹映射在不同的气象制度进行了讨论。一个案例研究发生在平流层突然变暖（SSW）伴随着极涡破裂;第二个发生在稳定的环流系统的改造。接近2012年秋分和六月至日的TM案例完成了这项研究，显示了地面遥感仪器网络在合成半球水汽图方面的巨大潜力。
Abstract. The important task to observe the global coverage of middle atmospheric trace gases like water vapor or ozone usually is accomplished by satellites. Climate and atmospheric studies rely upon the knowledge of trace gas distributions throughout the stratosphere and mesosphere. Many of these gases are currently measured from satellites, but it is not clear whether this capability will be maintained in the future. This could lead to a significant knowledge gap of the state of the atmosphere. We explore the possibilities of mapping middle atmospheric water vapor in the Northern Hemisphere by using Lagrangian trajectory calculations and water vapor profile data from a small network of five ground-based microwave radiometers. Four of them are operated within the frame of NDACC (Network for the Detection of Atmospheric Composition Change). Keeping in mind that the instruments are based on different hardware and calibration setups, a height-dependent bias of the retrieved water vapor profiles has to be expected among the microwave radiometers. In order to correct and harmonize the different data sets, the Microwave Limb Sounder (MLS) on the Aura satellite is used to serve as a kind of traveling standard. A domain-averaging TM (trajectory mapping) method is applied which simplifies the subsequent validation of the quality of the trajectory-mapped water vapor distribution towards direct satellite observations. Trajectories are calculated forwards and backwards in time for up to 10 days using 6 hourly meteorological wind analysis fields. Overall, a total of four case studies of trajectory mapping in different meteorological regimes are discussed. One of the case studies takes place during a major sudden stratospheric warming (SSW) accompanied by the polar vortex breakdown; a second takes place after the reformation of stable circulation system. TM cases close to the fall equinox and June solstice event from the year 2012 complete the study, showing the high potential of a network of ground-based remote sensing instruments to synthesize hemispheric maps of water vapor.