从基于机器学习的天气系统的角度来看,改善雨季和温暖季节的臭氧估计
Zhixuan Tong1, Yingying Yan2, Shaofei Kong2
1Department of Atmospheric Science, School of Environmental Sciences, China University of Geosciences, Wuhan 430074, China.
The Science of the total environment
|December 13, 2024
概括
中国东部的高表面臭氧污染发生在梅雨季,由特定的气象条件和大气循环驱动. 纳入大气循环指数可以提高臭氧预测的准确性.
科学领域:
- 大气化学和物理大气化学和物理
- 环境科学 环境科学
- 气候科学 气候科学
背景情况:
- 表面臭氧污染在中国东部越来越令人担忧,尤其是在夏季.
- 臭氧水平表现出与区域雨季,特别是梅雨时期相关的独特模式.
研究的目的:
- 调查梅雨季 (2015-2022) 期间臭氧度的时空分布.
- 为了确定影响臭氧水平的同视觉驱动因素.
- 用气象和大气循环数据估计臭氧度.
主要方法:
- 在梅时期对臭氧度 (MDA8 O3) 的分析,区分高臭氧时期 (HOP) 和非高臭氧时期 (NHOP).
- 气象数据分析 (降水量,温度,太阳辐射,相对湿度).
- 应用林德曼,梅伦达和戈尔德方法来评估气象因素的影响.
- 与近视尺度和大规模大气循环系统 (西太平洋亚热带大气,ENSO,东亚夏季季风) 的相关性分析.
- 机器学习模型用于估计臭氧度.
主要成果:
- 在梅季 (HOP) 间隔期间观察到高臭氧水平,占该时期的15.1%,在大多数地点的度超过NHOP20微克/m3.
- 与NHOP相比,HOP的特点是降水量较低,温度更高,太阳辐射增加,相对湿度降低.
- MDA8 O3的主要气象驱动因素是相对湿度 (30.4%),表面2m温度 (28.6%) 和总降水量 (23.2%).
- 西太平洋亚热带地区的南方位置 高度和更强 ENSO/东亚夏季季风强度与较高的臭氧相关.
- 结合大气循环指数的机器学习模型显著提高了臭氧估计准确度 (R2: 0.72,NRMSE: 0.15).
结论:
- 在梅雨区间期间的特定气象条件有利于表面臭氧的升高.
- 大气循环模式在此期间在推动臭氧污染方面发挥着至关重要的作用.
- 将大气循环指数整合到模型中,可以更好地预测梅雨季的臭氧污染.
相关概念视频
01:12Precipitation Processes
421
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
421
01:17Precipitation and Co-precipitation
1.7K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
1.7K
01:03Precipitation Gravimetry
5.3K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
5.3K
01:07What is Weather?
18.2K
Overview
18.2K
01:21Precipitation Titration Curve: Analysis
1.0K
The precipitation titration curve demonstrates the change in concentration of one reactant with the volume of titrant added. During the titration of chloride ions with silver nitrate, the precipitation titration curve is divided into three regions: before, at, and after the equivalence point. Before the equivalence point, low redissolution of the sparingly soluble silver chloride precipitate gives a low silver ion concentration. However, in the second region, representing the equivalence point,...
1.0K
01:18Steps in Outbreak Investigation
106
In the ever-evolving field of public health, statistical analysis serves as a cornerstone for understanding and managing disease outbreaks. By leveraging various statistical tools, health professionals can predict potential outbreaks, analyze ongoing situations, and devise effective responses to mitigate impact. For that to happen, there are a few possible stages of the analysis:
106