CN110109195B - Lightning approach prediction method based on radar and sounding data - Google Patents
Lightning approach prediction method based on radar and sounding data Download PDFInfo
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Abstract
The invention discloses a lightning proximity prediction method based on radar and sounding data, which is characterized in that four characteristic temperature layers with specific atmospheric temperature are defined according to acquired radar base data and sounding data, the latest sounding data of each characteristic temperature layer is subjected to linear interpolation through the latest height data and the latest temperature data of two adjacent data pressure layers to obtain the height of each characteristic temperature layer, extrapolation data are acquired at preset sampling time intervals according to the preset prediction timeliness of the radar base data, and finally, the corresponding extrapolation data of each characteristic temperature layer in the extrapolation data are utilized to acquire the lightning occurrence probability and risk level so as to finish lightning proximity prediction; the method has the advantages of high prediction precision and capability of well predicting the short lightning probability.
Description
Technical Field
The invention relates to a lightning forecasting method, in particular to a lightning approach forecasting method based on radar and sounding data.
Background
The thunder disaster is one of serious natural disasters which are published in international disaster reduction ten years of the united nations and affect human activities, is called as a public nuisance in the electronic era by the national defense electrotechnical commission, nearly thousands of people die of the thunder every year in China, and people and property losses caused by the thunder are more and more concerned by people nowadays when electric power and electronic equipment are widely applied.
According to the classical lightning principle, the temperature of the cloud top of the convection cloud is at least lower than-20 ℃ to generate more active lightning. The number and frequency of lightning varies greatly depending on the strength of convection, and generally speaking, the stronger the convection, the higher the number and frequency of lightning, and weather radar is the best means to observe the cloud of convection.
In recent years, with the continuous development of meteorological detection technology, the continuous abundance of meteorological data and the continuous improvement of forecasting technology, the research aspect of lightning disaster monitoring and early warning is more and more emphasized, the mainstream lightning monitoring and early warning technology at present is mostly based on atmospheric electric field, lightning positioning and radar data, the theoretical research on the aspect is not few, but the practical application still has great difficulties and disadvantages. Firstly, in the aspect of detection networking construction, due to the limitation of economic investment and other factors, the arrangement density of detection instruments cannot meet the requirement; secondly, due to the difference between the regions and the meteorological conditions, the determination of the early warning threshold value is often regional, and the research results of other people cannot well solve the local practical problem; in the research method, the conventional method still has certain phenomena of empty report and report missing, and the accuracy of early warning needs to be further improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a lightning approach prediction method based on radar and sounding data, which has high prediction precision and can better predict the probability of short-term lightning.
The technical scheme adopted by the invention for solving the technical problems is as follows: a lightning approach prediction method based on radar and sounding data comprises the following steps:
acquiring radar base data and sounding data, and defining a height layer at which the atmospheric temperature is 0 ℃ as a first characteristic temperature layer, a height layer at which the atmospheric temperature is-5 ℃ as a second characteristic temperature layer, a height layer at which the atmospheric temperature is-20 ℃ as a third characteristic temperature layer, and a height layer at which the atmospheric temperature is-10 ℃ as a fourth characteristic temperature layer;
performing linear interpolation on the latest sounding data of the first characteristic temperature layer according to the latest height data and the latest temperature data of two data air pressure layers adjacent to the first characteristic temperature layer in the sounding data to obtain the height of the first characteristic temperature layerAccording to the detected space data and the secondThe latest height data and the latest temperature data of two adjacent data air pressure layers of the characteristic temperature layer carry out linear interpolation on the latest sounding data of the second characteristic temperature layer to obtain the height of the second characteristic temperature layerPerforming linear interpolation on the latest sounding data of the third characteristic temperature layer according to the latest height data and the latest temperature data of two data air pressure layers adjacent to the third characteristic temperature layer in the sounding data to obtain the height of the third characteristic temperature layerPerforming linear interpolation on the latest sounding data of the fourth characteristic temperature layer according to the latest height data and the latest temperature data of two data air pressure layers adjacent to the fourth characteristic temperature layer in the sounding data to obtain the height of the fourth characteristic temperature layer;
Acquiring extrapolation forecast data at preset sampling time intervals within preset forecast timeliness according to radar base dataAcquiring data corresponding to the first characteristic temperature layer in the extrapolation prediction data and defining the data as first extrapolation data according toAcquiring data corresponding to the second characteristic temperature layer in the extrapolation prediction data and defining the data as second extrapolation data according toObtaining data corresponding to the third characteristic temperature layer in the extrapolation prediction data and defining the data as third extrapolationData according toAcquiring data corresponding to a fourth characteristic temperature layer in the extrapolation forecast data and defining the data as fourth extrapolation data, and acquiring lightning occurrence probability F and risk level by using the first extrapolation data, the second extrapolation data, the third extrapolation data and the fourth extrapolation data, wherein the steps are as follows:
1 lightning frequency in 15 minutes is noted as Y1,Y1=-78.683+0.357X1+11.282X4-8.77X7Wherein X is1For the total area of the echoes in the first extrapolated data with an echo intensity greater than 40dBz, X4Is the maximum echo intensity, X, in the second extrapolation data7For the maximum echo intensity in the third extrapolated data, the total area of echoes with echo intensities above 40dBz in the first extrapolated data is less than 20km2And the maximum echo intensity in the fourth extrapolated data is less than 40dBz-2, when the total area of the echoes having an echo intensity of 40dBz or more in the first extrapolated data is 20km or more2Or performing the step when the maximum echo intensity in the fourth extrapolated data is greater than or equal to 40dBz-3;
-2 is Y1When the lightning occurrence probability is less than or equal to 100, the lightning occurrence probability F is judged to be F less than or equal to 20 percent, the risk level is no risk, and when the lightning occurrence probability F is less than or equal to 101 and is less than or equal to Y1Judging the probability F of lightning occurrence to be 20% < F < 40% when the probability is less than or equal to 200, and the risk grade is four, and judging the probability F of lightning occurrence to be 20% < F < 40% when the probability is less than or equal to 201, and when the probability is less than or equal to Y1When the lightning probability is less than or equal to 300, the lightning probability F is judged to be less than or equal to 60% and more than or equal to 45%, the risk grade is three, and when Y is less than or equal to three1When the lightning is more than 300, the lightning occurrence probability is judgedThe rate F is more than 60 percent and less than or equal to 80 percent, and the risk grade is two grades.
-3 is Y1When the lightning occurrence probability is less than or equal to 50, the lightning occurrence probability F is judged to be F less than or equal to 20 percent, the risk grade is no risk, and when the lightning occurrence probability F is less than or equal to 51 and less than or equal to Y1When the lightning probability is less than or equal to 100, judging that the lightning probability F is more than 20 percent and less than or equal to 40 percent, and the risk grade is four grades, when Y is more than or equal to 1011When the lightning probability is less than or equal to 200, the lightning probability F is judged to be less than or equal to 60% and more than or equal to 45%, the risk grade is three, and when Y is less than or equal to 2011When the lightning probability is less than or equal to 300, the lightning probability F is judged to be more than 60 percent and less than or equal to 80 percent, the risk grade is two grade, when Y is less than or equal to 80 percent1And when the lightning probability is more than 300, the lightning probability F is judged to be F more than 80%, and the risk level is first grade.
Wherein, in the step (A),is the height of the first characteristic temperature layer,the height of a data air pressure layer adjacent to the first characteristic temperature layer and positioned at the upper part is provided,the height of a data air pressure layer adjacent to the first characteristic temperature layer and positioned at the lower part is provided,the temperature of the upper data air pressure layer adjacent to the first characteristic temperature layer,the temperature of a data air pressure layer adjacent to the first characteristic temperature layer and positioned at the lower part is determined;
wherein, in the step (A),is the height of the second characteristic temperature layer,the height of a data air pressure layer adjacent to the second characteristic temperature layer and positioned at the upper part is provided,the height of a data air pressure layer adjacent to the second characteristic temperature layer and positioned at the lower part is provided,the temperature of the upper data air pressure layer adjacent to the second characteristic temperature layer,the temperature of a data air pressure layer adjacent to the second characteristic temperature layer and positioned at the lower part is determined;
wherein, in the step (A),is the height of the third characteristic temperature layer,the height of a data air pressure layer adjacent to the third characteristic temperature layer and positioned at the upper part is provided,the height of a data air pressure layer adjacent to the third characteristic temperature layer and positioned at the lower part is provided,is equal to the thirdThe upper part of the characteristic temperature layer is adjacent to the temperature of the data air pressure layer,the temperature of a data air pressure layer adjacent to the third characteristic temperature layer and positioned at the lower part is determined;
wherein, in the step (A),is the height of the fourth characteristic temperature layer,the height of a data air pressure layer adjacent to the fourth characteristic temperature layer and positioned at the upper part is provided,the height of a data air pressure layer adjacent to the fourth characteristic temperature layer and positioned at the lower part is provided,the temperature of the upper data air pressure layer adjacent to the fourth characteristic temperature layer,the temperature of a data air pressure layer adjacent to the fourth characteristic temperature layer and positioned at the lower part is provided.
Compared with the prior art, the method has the advantages that four characteristic temperature layers with specific atmospheric temperature are defined according to the acquired radar base data and sounding data, the latest sounding data of each characteristic temperature layer is subjected to linear interpolation through the latest height data and the latest temperature data of two adjacent data air pressure layers to obtain the height of each characteristic temperature layer, extrapolation prediction data are acquired at preset sampling time intervals according to the preset prediction timeliness of the radar base data, and finally, the corresponding extrapolation data of each characteristic temperature layer in the extrapolation prediction data are utilized to acquire the lightning occurrence probability and risk level, so that lightning approach prediction is completed; the forecasting result is detected by using the live data of the lightning positioner, and the detection result shows that the forecasting method has higher forecasting precision and can better forecast the short-term lightning probability.
Detailed Description
The present invention is described in further detail below.
A lightning approach prediction method based on radar and sounding data comprises the following steps:
acquiring radar base data and sounding data, and defining a height layer at which the atmospheric temperature is 0 ℃ as a first characteristic temperature layer, a height layer at which the atmospheric temperature is-5 ℃ as a second characteristic temperature layer, a height layer at which the atmospheric temperature is-20 ℃ as a third characteristic temperature layer, and a height layer at which the atmospheric temperature is-10 ℃ as a fourth characteristic temperature layer;
performing linear interpolation on the latest sounding data of the first characteristic temperature layer according to the latest height data and the latest temperature data of two data air pressure layers adjacent to the first characteristic temperature layer in the sounding data to obtain the height of the first characteristic temperature layerPerforming linear interpolation on the latest sounding data of the second characteristic temperature layer according to the latest height data and the latest temperature data of two data air pressure layers adjacent to the second characteristic temperature layer in the sounding data to obtain the height of the second characteristic temperature layerAccording to the latest height data and latest temperature data of two data pressure layers adjacent to the third characteristic temperature layer in the sounding data, the most important data of the third characteristic temperature layer is obtainedCarrying out linear interpolation on the new sounding data to obtain the height of a third characteristic temperature layerPerforming linear interpolation on the latest sounding data of the fourth characteristic temperature layer according to the latest height data and the latest temperature data of two data air pressure layers adjacent to the fourth characteristic temperature layer in the sounding data to obtain the height of the fourth characteristic temperature layer;
Acquiring extrapolation forecast data at preset sampling time intervals within preset forecast timeliness according to radar base dataAcquiring data corresponding to the first characteristic temperature layer in the extrapolation prediction data and defining the data as first extrapolation data according toAcquiring data corresponding to the second characteristic temperature layer in the extrapolation prediction data and defining the data as second extrapolation data according toAcquiring data corresponding to the third characteristic temperature layer in the extrapolation prediction data and defining the data as third extrapolation data according toAcquiring data corresponding to a fourth characteristic temperature layer in the extrapolation forecast data and defining the data as fourth extrapolation data, and acquiring lightning occurrence probability F and risk level by using the first extrapolation data, the second extrapolation data, the third extrapolation data and the fourth extrapolation data, wherein the steps are as follows:
1 lightning frequency in 15 minutes is noted as Y1,Y1=-78.683+0.357X1+11.282X4-8.77X7Wherein X is1For the total area of the echoes in the first extrapolated data with an echo intensity greater than 40dBz, X4Is the maximum echo intensity, X, in the second extrapolation data7For the maximum echo intensity in the third extrapolated data, the total area of echoes with echo intensities above 40dBz in the first extrapolated data is less than 20km2And the maximum echo intensity in the fourth extrapolated data is less than 40dBz-2, when the total area of the echoes having an echo intensity of 40dBz or more in the first extrapolated data is 20km or more2Or performing the step when the maximum echo intensity in the fourth extrapolated data is greater than or equal to 40dBz-3;
-2 is Y1When the lightning occurrence probability is less than or equal to 100, the lightning occurrence probability F is judged to be F less than or equal to 20 percent, the risk level is no risk, and when the lightning occurrence probability F is less than or equal to 101 and is less than or equal to Y1Judging the probability F of lightning occurrence to be 20% < F < 40% when the probability is less than or equal to 200, and the risk grade is four, and judging the probability F of lightning occurrence to be 20% < F < 40% when the probability is less than or equal to 201, and when the probability is less than or equal to Y1When the lightning probability is less than or equal to 300, the lightning probability F is judged to be less than or equal to 60% and more than or equal to 45%, the risk grade is three, and when Y is less than or equal to three1When the lightning probability is more than 300, the lightning probability F is judged to be more than 60% and less than or equal to 80%, and the risk level is two levels.
-3 is Y1When the lightning occurrence probability is less than or equal to 50, the lightning occurrence probability F is judged to be F less than or equal to 20 percent, the risk grade is no risk, and when the lightning occurrence probability F is less than or equal to 51 and less than or equal to Y1When the lightning probability is less than or equal to 100, judging that the lightning probability F is more than 20 percent and less than or equal to 40 percent, and the risk grade is four grades, when Y is more than or equal to 1011When the lightning occurrence probability F is not less than 200%, judging that the lightning occurrence probability F is not less than 45% and not more than 60%, and carrying out risk judgmentThe grade is three, when 201 is less than or equal to Y1When the lightning probability is less than or equal to 300, the lightning probability F is judged to be more than 60 percent and less than or equal to 80 percent, the risk grade is two grade, when Y is less than or equal to 80 percent1And when the lightning probability is more than 300, the lightning probability F is judged to be F more than 80%, and the risk level is first grade.
Wherein, in the step (A),is the height of the first characteristic temperature layer,the height of a data air pressure layer adjacent to the first characteristic temperature layer and positioned at the upper part is provided,the height of a data air pressure layer adjacent to the first characteristic temperature layer and positioned at the lower part is provided,the temperature of the upper data air pressure layer adjacent to the first characteristic temperature layer,the temperature of a data air pressure layer adjacent to the first characteristic temperature layer and positioned at the lower part is determined;
wherein, in the step (A),is the height of the second characteristic temperature layer,the height of a data air pressure layer adjacent to the second characteristic temperature layer and positioned at the upper part is provided,the height of a data air pressure layer adjacent to the second characteristic temperature layer and positioned at the lower part is provided,the temperature of the upper data air pressure layer adjacent to the second characteristic temperature layer,the temperature of a data air pressure layer adjacent to the second characteristic temperature layer and positioned at the lower part is determined;
wherein, in the step (A),is the height of the third characteristic temperature layer,the height of a data air pressure layer adjacent to the third characteristic temperature layer and positioned at the upper part is provided,the height of a data air pressure layer adjacent to the third characteristic temperature layer and positioned at the lower part is provided,the temperature of the upper data air pressure layer adjacent to the third characteristic temperature layer,the temperature of a data air pressure layer adjacent to the third characteristic temperature layer and positioned at the lower part is determined;
wherein, in the step (A),is the height of the fourth characteristic temperature layer,the height of a data air pressure layer adjacent to the fourth characteristic temperature layer and positioned at the upper part is provided,the height of a data air pressure layer adjacent to the fourth characteristic temperature layer and positioned at the lower part is provided,the temperature of the upper data air pressure layer adjacent to the fourth characteristic temperature layer,the temperature of a data air pressure layer adjacent to the fourth characteristic temperature layer and positioned at the lower part is provided.
The results of practical experiments using the above method are as follows: setting the preset forecast aging to be 10-30 minutes, setting the sampling time interval to be 10 minutes, and checking the forecast results of 322 times in total through five typical thunderstorm processes of 6-9 months in 2018, wherein the check results show that when the forecast aging is 10 minutes, the accuracy reaches 85.4%, the null report rate is 2.8%, and the false report rate is 11.8%; when the forecasting aging time is 20 minutes, the accuracy rate reaches 82.6 percent, the empty report rate reaches 1.2 percent, and the missing report rate reaches 16.2 percent; when the forecasting aging time is 10 minutes, the accuracy rate reaches 77.3 percent, the empty report rate reaches 1.3 percent, and the missing report rate reaches 21.4 percent. In conclusion, the prediction method in the Ningbo area is high in prediction precision and can be used for better predicting the probability of short-term lightning.
Claims (2)
1. A lightning approach prediction method based on radar and sounding data is characterized by comprising the following steps:
step 1): acquiring radar base data and sounding data, and defining a height layer at which the atmospheric temperature is 0 ℃ as a first characteristic temperature layer, a height layer at which the atmospheric temperature is-5 ℃ as a second characteristic temperature layer, a height layer at which the atmospheric temperature is-20 ℃ as a third characteristic temperature layer, and a height layer at which the atmospheric temperature is-10 ℃ as a fourth characteristic temperature layer;
step 2): performing linear interpolation on the latest sounding data of the first characteristic temperature layer according to the latest height data and the latest temperature data of two data air pressure layers adjacent to the first characteristic temperature layer in the sounding data to obtain the height H of the first characteristic temperature layer1Performing linear interpolation on the latest sounding data of the second characteristic temperature layer according to the latest height data and the latest temperature data of two data air pressure layers adjacent to the second characteristic temperature layer in the sounding data to obtain the height H of the second characteristic temperature layer2Performing linear interpolation on the latest sounding data of the third characteristic temperature layer according to the latest height data and the latest temperature data of two data air pressure layers adjacent to the third characteristic temperature layer in the sounding data to obtain the height H of the third characteristic temperature layer3Performing linear interpolation on the latest sounding data of the fourth characteristic temperature layer according to the latest height data and the latest temperature data of two data air pressure layers adjacent to the fourth characteristic temperature layer in the sounding data to obtain the height H of the fourth characteristic temperature layer4;
Step 3): acquiring extrapolation forecast data at preset sampling time interval within preset forecast time according to radar base data, and acquiring extrapolation forecast data according to H1Acquiring data corresponding to the first characteristic temperature layer in the extrapolation prediction data, defining the data as first extrapolation data according to H2Acquiring data corresponding to the second characteristic temperature layer in the extrapolation forecast data, defining the data as second extrapolation data according to H3Acquiring data corresponding to the third characteristic temperature layer in the extrapolation prediction data, defining the data as third extrapolation data according to H4Acquiring data corresponding to a fourth characteristic temperature layer in the extrapolation forecast data and defining the data as fourth extrapolation data, and acquiring lightning occurrence probability F and risk level by using the first extrapolation data, the second extrapolation data, the third extrapolation data and the fourth extrapolation data, wherein the steps are as follows:
step 3-1): the lightning frequency within 15 minutes is recorded as Y1,Y1=-78.683+0.357X1+11.282X4-8.77X7Wherein X is1For the total area of the echoes in the first extrapolated data with an echo intensity greater than 40dBz, X4Is the maximum echo intensity, X, in the second extrapolation data7For the maximum echo intensity in the third extrapolated data, the total area of echoes with echo intensities above 40dBz in the first extrapolated data is less than 20km2And performing step 3-2) when the maximum echo intensity in the fourth extrapolated data is less than 40dBz, and when the total area of the echoes with echo intensities above 40dBz in the first extrapolated data is equal to or greater than 20km2Or performing step 3-3) when the maximum echo intensity in the fourth extrapolated data is equal to or greater than 40 dBz;
step 3-2): when Y is1When the lightning occurrence probability is less than or equal to 100, the lightning occurrence probability F is judged to be F less than or equal to 20 percent, the risk level is no risk, and when the lightning occurrence probability F is less than or equal to 101 and is less than or equal to Y1Judging the probability F of lightning occurrence to be 20% < F < 40% when the probability is less than or equal to 200, and the risk grade is four, and judging the probability F of lightning occurrence to be 20% < F < 40% when the probability is less than or equal to 201, and when the probability is less than or equal to Y1When the lightning probability is less than or equal to 300, the lightning probability F is judged to be less than or equal to 60% and more than or equal to 45%, the risk grade is three, and when Y is less than or equal to three1When the lightning probability is more than 300, the lightning probability F is judged to be more than 60% and less than or equal to 80%, and the risk level is two-level;
step 3-3): when Y is1When the lightning occurrence probability is less than or equal to 50, the lightning occurrence probability F is judged to be F less than or equal to 20 percent, the risk grade is no risk, and when the lightning occurrence probability F is less than or equal to 51 and less than or equal to Y1When the lightning probability is less than or equal to 100, judging that the lightning probability F is more than 20 percent and less than or equal to 40 percent, and the risk grade is four grades, when Y is more than or equal to 1011When the lightning probability is less than or equal to 200, the lightning probability F is judged to be less than or equal to 60% and more than or equal to 45%, the risk grade is three, and when Y is less than or equal to 2011When the lightning probability is less than or equal to 300, the lightning probability F is judged to be more than 60 percent and less than or equal to 80 percent, the risk grade is two grade, when Y is less than or equal to 80 percent1And when the lightning probability is more than 300, the lightning probability F is judged to be F more than 80%, and the risk level is first grade.
2. The method of claim 1, wherein the method comprises using radar and sounding data to predict lightning approachWherein H1Height of the first characteristic temperature layer, Hj1The height of a data air pressure layer adjacent to the first characteristic temperature layerk1Is the height of a data air pressure layer adjacent to the first characteristic temperature layerj1The temperature of an upper data air pressure layer adjacent to the first characteristic temperature layerk1The temperature of a data air pressure layer adjacent to the first characteristic temperature layer and positioned at the lower part is determined;
wherein H2Height of the second characteristic temperature layer, Hj2The height of a data air pressure layer adjacent to the second characteristic temperature layerk2The height of a lower data air pressure layer adjacent to the second characteristic temperature layer is Tj2The temperature of an upper data air pressure layer adjacent to the second characteristic temperature layerk2The temperature of a data air pressure layer adjacent to the second characteristic temperature layer and positioned at the lower part is determined;
wherein H3Height of the third characteristic temperature layer, Hj3The height of a data air pressure layer adjacent to the third characteristic temperature layerk3The height of a lower data air pressure layer adjacent to the third characteristic temperature layer, Tj3The temperature of an upper data air pressure layer adjacent to the third characteristic temperature layerk3The temperature of a data air pressure layer adjacent to the third characteristic temperature layer and positioned at the lower part is determined;
wherein H4Height of the fourth characteristic temperature layer, Hj4The height of a data air pressure layer adjacent to the fourth characteristic temperature layerk4The height of a lower data air pressure layer adjacent to the fourth characteristic temperature layer is Tj4The temperature of an upper data air pressure layer adjacent to the fourth characteristic temperature layerk4The temperature of a data air pressure layer adjacent to the fourth characteristic temperature layer and positioned at the lower part is provided.
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