北京地區(qū)邊界層低空急流的時(shí)空發(fā)展特征分析

doi:10.12306/2023jms.0009

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北京地區(qū)邊界層低空急流的時(shí)空發(fā)展特征分析
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                        10.12306/2023jms.0009
                    
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中圖分類號(hào):P442
基金項(xiàng)目:國(guó)家自然科學(xué)基金面上資助項(xiàng)目(41975011)

Temporal and spatial characteristics of the low-level boundary layer jet over Beijing

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摘要:

利用2018—2019年多普勒激光雷達(dá)資料及Micaps數(shù)據(jù),探討了北京地區(qū)邊界層低空急流的季節(jié)變化、日變化及發(fā)展演變特征,統(tǒng)計(jì)分析了不同天氣系統(tǒng)下,邊界層低空急流出現(xiàn)的頻次。結(jié)果表明:(1)北京地區(qū)邊界層低空急流表現(xiàn)出明顯的季節(jié)性差異特征。急流在春、夏、冬季每日發(fā)生的頻率分別為56.2%、52.3%、54.8%,而秋季最高,為79.4%,且四季都存在單日多急流過(guò)程的現(xiàn)象;急流軸高度表現(xiàn)為單峰狀態(tài),春、冬兩季急流發(fā)生頻率與高度呈反比,秋、冬兩季的急流多發(fā)生于200~400 m低層峰值內(nèi);北京地區(qū)全年急流強(qiáng)度多以弱急流為主,主要集中于5~9 m·s^-1,春、秋及冬季急流強(qiáng)度較弱,夏季急流較強(qiáng)。(2)北京地區(qū)邊界層低空急流具有明顯的日變化特征,近89.5%的急流發(fā)生于夜間,日間發(fā)生的急流主要集中于上午,發(fā)生頻率為7.6%,統(tǒng)計(jì)發(fā)現(xiàn)這部分急流主要為夜間急流的延續(xù)。(3)北京地區(qū)邊界層低空急流按其發(fā)展特征可分為5種類型:經(jīng)典型、抬升型、下沉型、間歇型及弱風(fēng)速帶型。(4)急流多發(fā)的天氣形勢(shì)可分為高壓控制、高壓前部、高壓后部、高壓底部、高壓頂部及均壓場(chǎng)6種類型,急流發(fā)生頻率分別為11.1%、9.5%、7.9%、6.3%、15.9%及38.1%。

Abstract:

In this study, based on the 2018-2019 Doppler Lidar data and Micaps data, the seasonal variation, diurnal variation and evolution characteristics of the Low-Level Jet (LLJ) in Beijing area were discussed. In addition, the frequency of LLJ in the boundary layer under different weather systems was analyzed statistically. Results show that: (1) the LLJ in the boundary layer over Beijing shows obvious seasonal differences. The daily occurrence frequency of LLJ in spring, summer and winter was 56.2%, 52.3% and 54.8%, respectively, and in autumn, it was the highest, which was 79.4%. And the phenomenon of multi-LLJ process in a single day exists in all seasons. The height of LLJ axis shows a single peak state. The frequency of the LLJ in spring and winter is inversely proportional to the height, while the LLJ in autumn and winter mostly occurs within the 200-400 m peak. The intensity of the LLJ in Beijing is mainly weak jet, mainly concentrated around 5-9 m·s^-1. The LLJ is weak in spring, autumn and winter, but is stronger in summer. (2) The LLJ in the boundary layer in Beijing shows obvious diurnal variation. Nearly 89.5% of the LLJ occurred at night, and the LLJ occurred during the day mainly concentrated in the morning, with a frequency of 7.6%. Statistics show that this part of the LLJ is mainly the continuation of the night jet. (3) According to its development characteristics, the boundary layer LLJ over Beijing can be divided into five types: meridian type, uplift type, subsidence type, intermittent type and weak wind speed zone type. (4) The weather conditions with multiple jet streams can be divided into six types: high pressure control, high pressure front, high pressure back, high pressure bottom, high pressure top and uniform pressure field, and the LLJ frequency was 11.1%, 9.5%, 7.9%, 6.3%, 15.9% and 38.1%.

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王嘉鑫,王成剛,嚴(yán)家德,李炬.北京地區(qū)邊界層低空急流的時(shí)空發(fā)展特征分析.氣象科學(xué),2024,44(5):899-906 WANG Jiaxin, WANG Chenggang, YAN Jiade, LI Ju. Temporal and spatial characteristics of the low-level boundary layer jet over Beijing. Journal of the Meteorological Sciences,2024,44(5):899-906

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收稿日期:2022-11-16
最后修改日期:2023-01-11
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在線發(fā)布日期: 2024-11-21
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