CN111208585A - Based on PM2.5Concentration profile polluted boundary layer height early warning method - Google Patents
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Abstract
The invention discloses a method based on PM2.5A method for early warning the height of a polluted boundary layer of a concentration profile relates to the field of artificial weather influence, disaster prevention and reduction, and comprises the steps of S1 determining the high-low altitude circulation situation of a polluted area; s2, acquiring the altitude and the hourly rainfall; s3 determining topographic features and precipitation conditions; s4 determining PM according to terrain features and precipitation conditions2.5Concentration profile, which carries out pollution boundary layer height early warning; pollution boundary layer height early warning and forecasting method based on WRF-CHEM mode, and large amount of PM is adopted2.5Concentration vertical distribution data establishes PM2.5Concentration profile, PM is taken according to GB 3095 plus 2012' environmental air quality Standard2.5The mass concentration is equal to 75 mu g.m‑3Defining the height from the ground to the concentration threshold as a pollution boundary layer as a critical threshold of the air pollution state, rapidly determining the height of the pollution boundary layer of an area where the air pollution occurs through a profile,and carrying out early warning on the height of the polluted boundary layer.
Description
Technical Field
The invention relates to the field of artificial influence weather disaster prevention and reduction, in particular to a method based on PM2.5A method for early warning the height of a polluted boundary layer of a concentration profile.
Background
With the development of economy, the problem of urban air pollution is increasingly serious, and gas pollutants such as particulate matters, ozone, nitrogen oxides, sulfides and the like in the air are not beneficial to human health, can reduce the visibility of the air and influence the safety of traffic and aviation, so that the problem of air pollution is widely concerned by governments and society.
Although excessive emissions of pollutants are the root cause of atmospheric pollution, changes in the concentration of atmospheric pollutants, and even the occurrence of heavy pollution events, are largely influenced by meteorological conditions that are adverse to atmospheric diffusion (Ye et al, 2015; Ning et al, 2018). Theoretical and practical studies of atmospheric diffusion have shown that, although the amount of local pollutants emitted does not vary much over a certain period of time (Wu et al 2017), the atmospheric pollutant concentrations vary very drastically under different meteorological conditions (Lizoneca et al 1985), indicating that the polluted meteorological conditions play a crucial role in regulating the change in pollutant concentrations (Hurley et al 2001; Liuningmi et al 2010; Li et al 2015). Guo Li et al (2011) found that the mass concentration of particulate matter in Beijing is positively correlated with temperature and negatively correlated with wind speed in 6 months, and the mass concentration of particulate matter in 11 months is positively correlated with relative humidity and negatively correlated with wind speed, temperature and air pressure. Chen Bohai Li et al (2015) find that heavy pollution weather in Changzhou city mostly occurs under the control of northwest wind, and when the air temperature is low, the air pollution probability is high. Jiamenwei et al (2016) found that Nanjing area O3 has a significant positive correlation with temperature and boundary layer height, that in spring and winter the concentration of particles has a significant negative correlation with temperature, and that in summer and autumn the concentration of particles has a negative correlation with humidity. The above studies all show that the maintenance, diffusion and meteorological conditions of pollutants are closely related.
Through patent and literature retrieval, two main methods for air quality prediction exist at present, namely a numerical prediction mode and a statistical method. The numerical forecasting method is usually suitable for regional air pollution forecasting, the air quality forecasting based on a statistical method is usually applied to regional range forecasting, the method is based on the historical data of main meteorological elements and air quality of a region, multiple stepwise regression is carried out by analyzing the correlation between the main meteorological elements and the historical data, an optimal forecasting equation is established, and then the observed meteorological data is used for forecasting the future air quality, so that the method has the characteristics of quickness and simplicity. In recent years, BP neural networks are widely applied to air quality prediction (ledlzhi, etc., 2010), and although the BP neural networks can better extract linear and nonlinear factors in data sets, problems such as over-fitting, under-fitting, excessive calculation amount and the like occur in the training process of a model, so that the prediction accuracy of the model is influenced to a certain extent.
The method is widely applied to air quality early warning and forecasting, but mostly aims at forecasting the concentration of air pollutants on the near ground. With economic development, the problem of air pollution in a plurality of regions in China is increasingly serious in recent years, and the existing air quality monitoring network has a great gap in realizing high-altitude pollutant concentration monitoring, so that the reasonable utilization of a numerical mode to perfect high-altitude air quality early warning and forecasting has important significance.
Disclosure of Invention
The invention aims to solve the problems that the PM-based material is designed2.5A method for early warning the height of a polluted boundary layer of a concentration profile.
The invention realizes the purpose through the following technical scheme:
based on PM2.5The method for early warning the height of the polluted boundary layer of the concentration profile comprises the following steps:
s1, determining the high-low altitude circulation potential of the polluted area according to the distribution characteristics on the weather map and the atmospheric motion state represented by the distribution characteristics;
s2, acquiring the altitude h and the hourly rainfall R;
s3, determining the topographic characteristics of the polluted area according to the altitude h, and determining the precipitation condition of the polluted area according to the hourly rainfall R;
s4, determining PM according to terrain features and precipitation conditions2.5Concentration profile, PM2.5Concentration profile represents PM2.5And (4) carrying out early warning on the height of the polluted boundary layer according to the relation between the concentration and the height.
The invention has the beneficial effects that: pollution boundary layer height early warning and forecasting method based on WRF-CHEM mode, and large amount of PM is adopted2.5Concentration vertical distribution data establishes PM2.5Concentration profile, PM is taken according to GB 3095 plus 2012' environmental air quality Standard2.5Mass concentration equal to 75μg·m-3The height from the ground to the concentration threshold is defined as a pollution boundary layer, the height of the pollution boundary layer in an area where air pollution occurs is rapidly determined through the profile, and the height early warning of the pollution boundary layer is carried out.
Drawings
FIG. 1 shows a PM-based system according to the present invention2.5A flow chart of a polluted boundary layer height early warning method of the concentration profile;
FIG. 2 is a high circulation situation during the period of no precipitation for a 500hPa potential altitude field during the weather of an individual contamination example;
FIG. 3 is a precipitation period high circulation situation for a 500hPa potential altitude field during a pollution example weather;
FIG. 4 is a high circulation situation during the no precipitation period of 700hPa relative humidity field during the weather of a pollution example;
FIG. 5 is a precipitation period high altitude circulation situation for a 700hPa relative humidity field during a contamination example weather;
FIG. 6 is a vertical distribution plot of the physical quantity field during periods of no precipitation during weather for an example of pollution;
FIG. 7 is a vertical distribution plot of the physical magnitude field during precipitation during weather for an example of pollution;
FIG. 8 shows PM of 500m or less in a pollution example partial region2.5Fitting a power function curve between the concentration and the height;
wherein, in FIG. 8: a represents mountain land, no precipitation and PM2.5The mass concentration is more than 150 mu g.m-3B-represents mountain land, precipitation occurrence, PM2.5The mass concentration is less than 150 mu g.m-3C-represents basin, no precipitation, PM2.5The mass concentration is less than 150 mu g.m-3D-represents a basin, no precipitation, PM2.5The mass concentration is more than 150 mu g.m-3The case (1).
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is also to be noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be interpreted broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following detailed description of embodiments of the invention refers to the accompanying drawings.
As shown in figures 1, 2, 3, 4, 5, 6, 7 and 8,
based on PM2.5The method for early warning the height of the polluted boundary layer of the concentration profile comprises the following steps:
s1, determining the high-low altitude circulation potential of the polluted area according to the distribution characteristics on the weather map and the atmospheric motion state represented by the distribution characteristics;
and S2, acquiring the altitude h and the hourly rainfall R.
S3, determining the topographic characteristics of the polluted area according to the altitude h, and determining the precipitation condition of the polluted area according to the hourly rainfall R;
judging the topographic features: determining the topographic characteristics of the polluted area according to the altitude h, and determining the polluted area as a basin terrain when the altitude h of the polluted area is more than 800m different from the altitude h of the surrounding area within the radius of 250 km; the altitude is more than 500m, and the terrain relief degree delta h is more than 200m, the terrain is determined to be mountain terrain, wherein delta h is hmax-hmin，hmaxIs the maximum altitude value, h, in the selected areaminThe minimum altitude value in the selected area is obtained;
and (4) judging the precipitation condition: determining whether the polluted area has precipitation or not according to the hourly rainfall R; r is more than or equal to 0.1mm and is determined as precipitation; r is less than 0.1mm, and no precipitation occurs.
S4, determining PM according to terrain features and precipitation conditions2.5Concentration profile, PM2.5Concentration profile represents PM2.5The relation between the concentration and the height is used for carrying out early warning on the height of the polluted boundary layer;
PM2.5concentration profile is Ht＝aXt bWherein X istAt time PM2.5A, b are coefficient values, HtIs the height value of the contaminated boundary layer;
s41, determining the value of the coefficient value according to the terrain feature and the precipitation condition;
when the area is mountain terrain, if no precipitation occurs, PM near the ground2.5The mass concentration is more than 150 mu g.m-3When the coefficient value a is 1412.8, b is-0.674;
when the area is mountain terrain, if no precipitation occurs, PM near the ground2.5The mass concentration is not more than 150 mu g.m-3When the coefficient value is 2042.95, b is-0.795;
in mountainous terrain, precipitation (the hourly rainfall is less than or equal to 0.3mm) occurs, and PM near the ground2.5The mass concentration is more than 150 mu g.m-3When the coefficient value a is 46125, b is-1.463;
in mountainous terrain, precipitation (the hourly rainfall is less than or equal to 0.3mm) occurs, and PM near the ground2.5The mass concentration is not more than 150 mu g.m-3When the coefficient value is-30266, b-1.466;
in the basin, no precipitation occurs and PM is near the ground2.5The mass concentration is more than 150 mu g.m-3When the coefficient value is 2317.85, b-0.796;
in the basin, no precipitation occurs and PM is near the ground2.5The mass concentration is not more than 150 mu g.m-3When the coefficient value is 1043.3, b-0.658;
when in a basin, precipitation occurs (the hourly rainfall is less than or equal to 0.3mm), and PM is close to the ground2.5The mass concentration is more than 150 mu g.m-3When the coefficient value a is 1085.35, b is-0.639;
when in a basin, precipitation occurs (the hourly rainfall is less than or equal to 0.3mm), and PM is close to the ground2.5The mass concentration is not more than 150 mu g.m-3When the coefficient value a is 1796.4, b is-0.812;
s42, mixing Xt＝75μg·m-3And (4) taking the critical threshold value of the air pollution state, determining the height of the pollution boundary layer in the region by combining the coefficient value determined by S31, and performing early warning on the height of the pollution boundary layer.
According to the concentration profile, judging whether the concentration of the air pollutants in each height layer is reduced to a standard threshold (PM) or not under corresponding conditions2.5＝75μg·m-3) In the following, the contamination boundary layer warning of the height layer is released.
Pollution boundary layer height early warning and forecasting method based on WRF-CHEM mode, and large amount of PM is adopted2.5Concentration vertical distribution data establishes PM2.5Concentration profile, PM is taken according to GB 3095 plus 2012' environmental air quality Standard2.5The mass concentration is equal to 75 mu g.m-3The method is characterized in that the critical threshold value of the air pollution state is defined, the height from the ground to the concentration threshold value is defined as a pollution boundary layer, the height of the pollution boundary layer of an area with air pollution is rapidly determined through a profile, and corresponding early warning information is issued.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (3)
1. Based on PM2.5The method for early warning the height of the polluted boundary layer of the concentration profile is characterized by comprising the following steps of:
s1, determining the high-low altitude circulation potential of the polluted area according to the distribution characteristics on the weather map and the atmospheric motion state represented by the distribution characteristics;
s2, acquiring the altitude h and the hourly rainfall R;
s3, determining the topographic characteristics of the polluted area according to the altitude h, and determining the precipitation condition of the polluted area according to the hourly rainfall R;
s4, determining PM according to terrain features and precipitation conditions2.5Concentration profile, PM2.5Concentration profile represents PM2.5And (4) carrying out early warning on the height of the polluted boundary layer according to the relation between the concentration and the height.
2. A PM-based according to claim 12.5The method for early warning the height of the polluted boundary layer of the concentration profile is characterized by comprising the following steps of S3:
judging the topographic features: determining the topographic characteristics of the polluted area according to the altitude h, and determining the polluted area as a basin terrain when the altitude h of the polluted area is more than 800m different from the altitude h of the surrounding area within the radius of 250 km; altitude is above 500m, and relief degreeWhen delta h is more than 200m, the terrain is determined to be mountain terrain, wherein the delta h is hmax-hmin，hmaxIs the maximum altitude value, h, in the selected areaminThe minimum altitude value in the selected area is obtained;
and (4) judging the precipitation condition: determining whether the polluted area has precipitation or not according to the hourly rainfall R; r is more than or equal to 0.1mm and is determined as precipitation; r is less than 0.1mm, and no precipitation occurs.
3. A PM-based according to claim 22.5A method for warning the height of a contaminated boundary layer of a concentration profile, characterized in that, in S4, PM2.5Concentration profile is Ht＝aXt bWherein X istAt time PM2.5A, b are coefficient values, HtIs the height value of the contaminated boundary layer;
s41, determining the value of the coefficient value according to the terrain feature and the precipitation condition;
when the area is mountain terrain, if no precipitation occurs, PM near the ground2.5The mass concentration is more than 150 mu g.m-3When the coefficient value a is 1412.8, b is-0.674;
when the area is mountain terrain, if no precipitation occurs, PM near the ground2.5The mass concentration is not more than 150 mu g.m-3When the coefficient value is 2042.95, b is-0.795;
in mountainous terrain, precipitation (the hourly rainfall is less than or equal to 0.3mm) occurs, and PM near the ground2.5The mass concentration is more than 150 mu g.m-3When the coefficient value a is 46125, b is-1.463;
in mountainous terrain, precipitation (the hourly rainfall is less than or equal to 0.3mm) occurs, and PM near the ground2.5The mass concentration is not more than 150 mu g.m-3When the coefficient value is-30266, b-1.466;
in the basin, no precipitation occurs and PM is near the ground2.5The mass concentration is more than 150 mu g.m-3When the coefficient value is 2317.85, b-0.796;
in the basin, no precipitation occurs and PM is near the ground2.5The mass concentration is not more than 150 mu g.m-3When the coefficient value a is 1043.3,b＝-0.658；
When in a basin, precipitation occurs (the hourly rainfall is less than or equal to 0.3mm), and PM is close to the ground2.5The mass concentration is more than 150 mu g.m-3When the coefficient value a is 1085.35, b is-0.639;
when in a basin, precipitation occurs (the hourly rainfall is less than or equal to 0.3mm), and PM is close to the ground2.5The mass concentration is not more than 150 mu g.m-3When the coefficient value a is 1796.4, b is-0.812;
s42, mixing Xt＝75μg·m-3And (4) taking the critical threshold value of the air pollution state, determining the height of the pollution boundary layer in the region by combining the coefficient value determined by S31, and performing early warning on the height of the pollution boundary layer.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104792672A (en) * | 2015-03-26 | 2015-07-22 | 中国人民解放军陆军军官学院 | Height distribution detection device and method for PM2.5 mass concentration |
| CN109582910A (en) * | 2018-12-11 | 2019-04-05 | 国网湖南省电力有限公司 | The calculation method and system of ground PM2.5 based on air mixing height |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104792672A (en) * | 2015-03-26 | 2015-07-22 | 中国人民解放军陆军军官学院 | Height distribution detection device and method for PM2.5 mass concentration |
| CN109582910A (en) * | 2018-12-11 | 2019-04-05 | 国网湖南省电力有限公司 | The calculation method and system of ground PM2.5 based on air mixing height |
Non-Patent Citations (3)
| Title |
|---|
| 薛文博等: "《PM2.5输送特征与环境容量模拟》", 31 January 2017 * |
| 陶宗明等: "《2014年合肥西郊PM2.5质量浓度廓线统计分布》", 《光学学报》 * |
| 陶宗明等: "《近地面PM2.5质量浓度廓线反演方法及个例研究》", 《激光与光电子学进展》 * |
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