Typhoon records in Shenzhen in 2007

2007 Shenzhen Climate Bulletin; Abstract; The main features of the climate in Shenzhen in 2007 are: less annual precipitation; Ping; The temperature of 1 is high; In 2007, the annual average temperature in Shenzhen was 23.5℃, which was higher than the level for many years. The spatial distribution of the average temperature in 2007 was generally high in the west and low in the east. Distribution map of annual average temperature in Shenzhen in 2007; 2. Less precipitation; In 2007, the rainfall in Shenzhen was 158 1.5 mm, which was many years too much. The precipitation in 2007 was mainly distributed in the west, with less in the east, Nanshan District and Baoan. Annual rainfall in Shenzhen in 2007

Climate Bulletin of Shenzhen in 2007

abstract

The main features of the climate in Shenzhen in 2007 are: less annual precipitation; The average temperature is high; Sunshine hours are flat; The meteorological disasters with the lowest humidity in history are characterized by three less impacts, two more and one stronger intensity, less rain in autumn and winter, heavy drought, less rainy days, more high temperature and less high temperature in hot days, more foggy days and strong local thunderstorms, which is a basic climatic condition.

The temperature of 1 is high.

In 2007, the annual average temperature in Shenzhen was 23.5℃, which was 65438 0℃ higher than the average temperature for many years and 0.65438 0℃ higher than last year. This is the continuous 2 1 year warmer since 1987, in which the average temperature in February, March and July of 12 is higher than the historical period. The average temperature of 65438+February 19oC is the second highest in history. The average temperature in July was 29.7 degrees, the second highest on record after 30.2 degrees in 2003. Only in April, the average temperature was lower than the historical period 1.0 oC, and the average temperature in other months was the same as the historical period, with the annual average maximum temperature of 27. 1oC, which was 0.5 oC； lower. Higher than in previous years. The annual average minimum temperature 16.4oC is 0.8 oc higher than the average minimum temperature in previous years. In the summer of 2007, there was 22 1 day, and it entered the summer on March 24, setting a new record for the earliest summer. Autumn began on June 365, 438+0, and the extreme maximum temperature in 2007 was 35.4. High temperature (35 oC) days 1 day; The extreme minimum temperature is 8.9 oC, which appears on 1.8.

The spatial distribution of the average temperature in 2007 was generally high in the west and low in the east. The annual average temperature in the west of Longgang, Futian, Nanshan, Baoan and southwest of Luohu is between 23-24 oC, and the rest is between 22-23 oC, with a difference of about 1 oC.

Distribution map of annual average temperature in Shenzhen in 2007

2 Less precipitation

In 2007, the rainfall in Shenzhen was1.586,5438+0.5mm, which was less than the average for many years 19.6%. This is a year with less rainfall, and it is the second year with the least rainfall in the past 65,438+00 years. Among them, the rainfall in May was 5%-6% more than that in the same period in history, and the rainfall in June was about 60% less than that in other months. It is nearly 60% less than the same period of last year, and the flood season started on April 24th, slightly later than the average flood season (April-September). The accumulated rainfall 1467.9mm accounts for 92.8% of the total annual precipitation, which is 1 1.3% less than the historical period. Among them, it was 56% less in July and 75% less in September. The cumulative rainfall from 10 to 12 is 55.7mm, which is about 67% less than the historical period. The number of rainy days in the whole year is 1 18 days, which is 22 days less than the same period in history on average. The annual maximum daily rainfall is 137.7mm, which occurs in June 10.

In 2007, there was less rainfall in the west and more rainfall in the east. The annual rainfall in Nanshan District and the west of Baoan, the east of Luohu and the middle and east of Longgang is less than 1400- 1600 mm, while the rainfall in most other areas is between 1400- 1600 mm. There are two rainfall centers in the north of Longgang and the east of Dapeng Peninsula, and the annual cumulative rainfall exceeds/kloc-0.

Distribution map of annual rainfall in Shenzhen in 2007

The sunshine is flat.

In 2007, the sunshine hours in Shenzhen were 1937. 1 hour, 7.3 hours more than the multi-year average and 3 12 hours more than last year.

4 Minimum humidity

In 2007, the annual average relative humidity in Shenzhen was only 70%, which was the same as the lowest relative humidity in 2005, and the average relative humidity in each month of the whole year was lower than that in the same period of history. The lowest relative humidity on 29 October and 2 February was 1 1% and 13%, which broke the same period of history respectively.

5 Other data

(1) Wind direction frequency

In 2007, the annual average wind speed in Shenzhen was 2.5 m/s, the dominant wind direction was northeast wind with a frequency of 16.7%, and the average wind speed was 2.4 m/s, followed by northeast wind and north-northeast wind with frequencies of 13.7% and 12.7% respectively, and southwest wind with a frequency of/.

Rose chart of wind frequency in 2007 (wind direction frequency \ average wind speed)

(2) Visibility

The average visibility in 2007 was 13.4km, which was the same as that in 2002. The visibility in flood season is obviously better than that in autumn and winter. The average visibility in June and July is the best, exceeding 20km, while the average visibility in February is 65,438+065,438+006,5438+00km.

Average visibility in February 2007 1-65438

Average visibility in 200 1-2007

Summary of Meteorological Disasters in 2007

In 2007, there were few tropical cyclones affecting Shenzhen, and the influence degree was weak, and Pabu Shengpa and Fansco had obvious influence. The number of rainstorm days is 6, and the number of rainstorm days is 1 day, which is less than the multi-year average of 9.3 days. The number of thunderstorm days is 69, which is the same as the multi-year average (68.4 days). High temperature and summer heat are rare, and the number of days exceeding 35oC in a year is only 1 day, but the high temperature weather continues in July, and heatstroke incidents occur frequently; The number of haze days in the whole year reached 23 1 day, setting a new record, but the number of severe haze days was less, and the annual average visibility was improved compared with previous years.

1 tropical cyclone

Compared with normal years, the number of tropical cyclones affecting Shenzhen in 2007 was less, the intensity was weaker and the impact time was later. There are 1 tropical cyclones that directly affect our city, and two other tropical cyclones have indirect effects on Shenzhen, but these three tropical cyclones have not seriously affected Shenzhen. In 2007, Pablo, the strong tropical storm 0707, and Shengpu, the super typhoon 0709 at the end of August were the tropical cyclones that had obvious influence on Shenzhen.

Track map of tropical cyclones affecting Shenzhen in 2007

2 rainstorm

The first rainstorm occurred on April 24th, marking the beginning of the flood season in Shenzhen in 2007. Since then, there have been five rainstorm processes on May 20th, June14th, July16th, August14th and June 7th, respectively, and a rainstorm process occurred on June10th, and the number of rainstorm days in the whole year was 7 days, which was less than the average for many years.

3 Thunderstorm

In 2007, the number of thunderstorm days in our city was 69, which was the same as the average for many years. Thunderstorms occurred in the second and third quarters of this year, with the largest number of thunderstorm days in June and August, all ending 20 days earlier. The time interval from the first day of thunderstorm (April 2) to the whole day (September 5) is only 157 days, setting a new record for the shortest time interval in history. According to statistics of relevant departments, in 2007.

There were very few high temperature days in 2007, and only one day in Shenzhen National Climate Observatory exceeded the high temperature record of 35oC. On August 8, due to the southward influence of the strong tropical storm outside Pablo, the city experienced hot and humid weather, and the highest temperature in Zhuzilin was 35.4 degrees, the highest temperature since this year.

In 2007, the average temperature was on the high side. In June, there was little cold air activity in 5438+ 10-3 months, and the cold weather with the lowest temperature below 10oC was only five days, which was the extreme lowest temperature.

8.9oC, appearing on 1.8.

There was a strong cold air process in early March, and the temperature dropped 10.3 oC for 48 hours from March 5 to 7, and the lowest temperature in the process was 9oC, which was the strongest cold air process from winter 2006 to spring 2007.

6 fog

There were two foggy days in Shenzhen in 2007, which was less than the average of 4.8 days. The foggy days occurred on March 25th and February 19, and the minimum visibility was 600m and 800m respectively.

7 haze

In 2007, the smog weather in our city was 23 1 day, which was the highest in history, 55 days more than the second highest in history in 2004. On September 14- 19, severe smog weather occurred in Shenzhen. The visibility lasted for 6 days was about 3-5 kilometers, and the minimum visibility was only 1.5 kilometers.

Major Meteorological Disasters Affecting Shenzhen in 2007

1 The tortuous path of severe tropical storm Pabu has great influence.

Tropical storm No.7 this year was generated in the Pacific Ocean on August 6th. After entering the South China Sea, it moves along the coast of Guangdong, with changeable intensity and tortuous path. Landed in Zhongshan, Hong Kong five days later, weakened and disappeared after entering Jiangmen. In the early stage, Pabu brought high temperature to Shenzhen, and in the later stage, the wind and rain were obviously affected by the descending airflow around Pabu. On August 8, there was hot and humid weather in our city, and the highest temperature recorded in Zhuzilin was 35.4 oC. For the highest temperature recorded this year, on the night of the 8th-1 1, the average wind force of magnitude 5-6 and the instantaneous gust of magnitude 8 or above were recorded every day in some places, and the maximum instantaneous gust of magnitude 8 was recorded in Nanshan (18m/s). Yantian recorded an instantaneous gale of 1 1 (29.0 m/s). The accumulated rainfall of Shenzhen National Climate Observatory in 9- 1 1 for three days is 1 12.9mm, and the accumulated rainfall of the whole city generally reaches 60- 100mm, exceeding 65438.

The super typhoon Sapa brought thunderstorms, strong winds and heavy precipitation.

On August 13, the super typhoon "Shengpa" generated in the eastern part of the western Pacific first hit Taiwan Province Province, and then landed in Fujian, bringing high temperature, strong convection and rainy weather to Shenzhen successively. On August 18, due to the influence of downdraft outside Shengpa, the city experienced hot and humid weather, and the highest temperature of regional automatic weather stations in the city was generally affected by the fast moving strong thunderstorm clouds outside Shengpa at night 18. There are strong thunderstorms and instantaneous gale weather from north to south in our city. In some areas, the gust is 8- 10. In 2022, due to the weakening of low-pressure circulation in Sao Paulo, there was strong precipitation in our city, and some of them

There are strong thunderstorms and heavy precipitation in the local area, and the cumulative rainfall distribution in 20 days is very uneven, with small to moderate rain in the west and heavy rain in the east. Qi Long and Xian 'an 'ao in Dapeng Ridge are torrential rains, and the maximum rainfall in the city appears at Xialing Station, which is 173mm.

The first rainstorm caused a lot of floods.

At 8- 1 1 on April 24th, the first rainstorm in 2007 occurred in our city, accompanied by a thunderstorm. The maximum hourly rainfall is 6 1mm/h, which appears at Shiyan Reservoir Station. The rainfall of Shenzhen National Climate Observatory is 68.4mm, and the daily rainfall of Guangming Station is 65,438. Strong thunderstorms and 6-8 instantaneous winds occurred in most parts of the city. Affected by heavy precipitation, many areas in Nanshan District and Songgang, Shajing and Xixiang in Baoan District were flooded with a water depth of 40-60 cm. Yijia Village and Haimen Village in Nanshan District were flooded 1 m. Dozens of acres of vegetable bases in Pingliang, Pinghu, An Tian were all flooded. The clear lake River in clear lake Community, Longhua Street, Bao 'an District rose 4 meters, washed away the berm, and the clear lake Bridge was closed for emergency repair. At the same time, the flood washed away the cable tower 200 miles away from clear lake Bridge, and the 13 power supply line was affected.

/kloc-in April of 0/8, thunderstorms and strong winds caused many accidents.

On May 18, strong thunderstorms and short-term gale occurred successively from northwest to southeast in Shenzhen. The hourly rainfall in most parts of the west exceeds 20 mm, and the maximum rainfall intensity is 57. 1 mm/h at Longhua Station, accompanied by short-term gale. The average wind power in Pingshan, Longgang is 5-6, and the instantaneous gust is 8-9, of which the timely gust in Pingshan is 23.7 m/s (9) due to rainfall. In the area of Liutang Road in Bao 'an, many cars fell into the water and stalled, causing traffic paralysis; Xixiang 107 national highway, with serious traffic jams; On the airport side, on June 5438+08 * * there was a flight delay of17, and Bo Huang Furniture City near Fuyong Street 107 National Road in Bao 'an District was hit by a thunderstorm and strong wind. Three 30,000-square-meter furniture cities were knocked down by strong winds, and the collapsed area was 2,500 square meters, causing five injuries. 1 person died after being rescued. The property loss is about 6,543,800 yuan. In addition, the steel ceiling lifted by the strong wind rolled to the gas station 250 meters away, two cars and a passenger car were smashed, and the steel beam lifted by the strong wind also smashed the front door of the bus parked at Guang 'an gas station next to Bo Huang Furniture City. In addition, the thunderstorm and gale on 18 also caused two big trees to fall at the entrance of Long Da Expressway and the entrance of Yannan Road City Art Museum about 1 km. 18, affected by strong lightning, Shiyan TV station was blacked out in a large area, and Da Lang street office Nongsheng Market 1 person was struck by lightning, causing serious lightning disaster in Shiyan toll station of expressway, resulting in direct economic loss of 300,000 yuan.

The rainstorm in the college entrance examination caused waterlogging and landslides.

On June 7- 10, sustained heavy precipitation and thunderstorms occurred in Shenzhen due to southwest depression and shear line. The precipitation process has the characteristics of long duration, wide range, high intensity and concentrated rainfall. At the same time, with the thunderstorm weather, the rainfall of 2 1 automatic stations in the city exceeded 50 mm, and the rainfall under Longqiling and Nan 'ao stations exceeded 10. The maximum hourly rainfall at Nan 'ao Station is 47.2 mm/h 10. Most automatic stations in the city experienced rainfall of more than 50 mm, of which 34 automatic stations recorded heavy rain of more than 100 mm, and the maximum rainfall was recorded at Shenzhen Reservoir Station, the maximum hourly rainfall was Dongjiaotou 166.6 mm, and the maximum hourly rainfall was recorded at Nanshan Shekou of 90.2 mm/h.

Cumulative rainfall on June 7th-10 (mm)

June 7-10 rainstorm caused waterlogging in more than 20 places in our city. The disaster mainly occurred in two districts of Nanshan Luohu, among which Nantou and Shekou Bay were the most serious. The water in the lower square of the 4000-square-meter Ocean World in Shekou, Nanshan reaches 3-4 meters, and the water in Zhongshan South Road in Nantou reaches 1 meter. /kloc-more than 0/00 surrounding residents evacuated the accumulated water in the underground shopping mall of Baomin No.1 Road in Baoan District. Most of the goods were flooded. According to the statistics of the city's three defense departments, the property loss caused by this rainstorm reached 20 million yuan. The rainstorm on June 7th-10 also caused 8 landslides, including Yulong New Village, Qingshuihe, Luohu, Nanshan Lishan Industrial Zone and Dawang Village of Wu Tong Road. 1 person injured. Heavy rainfall led to the collapse of two roads near Bantian Street and Nanshan Shekou Mid-Levels. The Sheshan-Zhang Long railway in Meizhou was forced to be interrupted due to landslides in many places, which led to the suspension of several trains passing through Shantou, Shenzhen and other places for seven days. On 10, there was a rainstorm and thunderstorm, and more than 100 planes were delayed.

On June 25th, the foggy weather closed the expressway.

On the morning of March 25th, Shenzhen was foggy, and the lowest visibility recorded by the National Climate Observatory was 600 meters. The Meteorological Observatory issued the first yellow warning signal of heavy fog in 2007. In order to ensure road traffic safety, Shenzhen section of Shenzhen-Shantou Expressway is closed for five hours in both directions, and Huiyan Expressway is closed for two hours. Yantian Port was closed at 9- 10 in the morning because the visibility was lower than 100 meters.

High temperature and heatstroke occur frequently in July.

Since July, there has been continuous high temperature, sunny and hot weather in our city. The daily average temperature is higher than 29 degrees, lasting 2 1 day, second only to the 23 days in 2003, ranking the second highest in the same period in history. The average temperature in July is as high as 29.7 degrees, which is also the second highest value in the same period in history. Although Zhuzilin National Climate Observatory did not record the temperature above 35℃, there were 22 days in July when the regional automatic weather station recorded the high temperature above 35℃. On July 14, the extreme maximum temperature at Wu Tong Village Station reached 37.6 degrees. According to the statistics of Shenzhen 120 Emergency Center, in July 120 Emergency Center * * rescued 765,438 heatstroke patients.

Average temperature from July 7th to 27th.

In mid-August, severe haze weather occurred continuously.

Affected by the downward airflow around tropical cyclone Lily and Weipa, the visibility in Shenzhen was about 3-5km from September/KOOC-0/4 to September/KOOC-0/9, and the lowest visibility was only/KOOC-0/.5 km in the morning of severe foggy weather/KOOC-0/6. Shenzhen Meteorological Observatory issued a yellow warning signal of haze on June 6, 2008 10: 00. During this period, there was a record of light pollution in Futian Longgang, Nanshan, Baoan District, in which June1May-June 17 and June 19 were light pollution.

The drought is serious in autumn and winter.

Because the average precipitation in our city this year is less than 20%, especially since September, the rainfall is seriously less, 72% less than the average for many years. From September 25th to February 30th, 65438+3 1, there has been a moderate drought in autumn and winter for 99 days, especially in small reservoirs with natural precipitation as the main water source. Due to less precipitation, the water supply in Guanlan Biling and other places in Longhua was once tight.

4. Climate impact assessment

1 Climate and Ambient Air Quality In 2007, the influence of climate conditions on Shenzhen's ambient air quality mainly showed that the air pollution index changed obviously with the seasons. In 2007, the number of days with excellent air quality grade was 159 days, which was 1 day less than that in 2006. The number of days of light pollution is 4 days, which is 2 days less than that in 2006. The months when the air quality grade is more than 20 days are mainly on June 78 in summer, including the air quality grade of the whole July.