2019年南海夏季風(fēng)爆發(fā)特征及其與10~25 d ISO的關(guān)系

doi:10.12306/2021jms.0025

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2019年南海夏季風(fēng)爆發(fā)特征及其與10~25 d ISO的關(guān)系
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                        10.12306/2021jms.0025
                    
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中圖分類(lèi)號(hào):P732
基金項(xiàng)目:基金項(xiàng)目:國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2019YFC1510004);國(guó)家自然科學(xué)基金資助項(xiàng)目(41975085;41975087)

Characteristics of South China Sea summer monsoon onset in 2019 and its relationship with 10-25 d intraseasonal oscillation

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摘要:

使用NCEP/NCAR再分析資料對(duì)2019年高度場(chǎng)、OLR場(chǎng)和風(fēng)場(chǎng)進(jìn)行了環(huán)流分析,計(jì)算假相當(dāng)位溫、西南風(fēng)和垂直風(fēng)切變等物理量,并且使用Lanczos濾波器濾波后進(jìn)行分位相討論了ISO與2019年南海夏季風(fēng)爆發(fā)的關(guān)系。結(jié)果表明,2019年南海夏季風(fēng)爆發(fā)的日期為5月6日,其爆發(fā)偏早。在5月6日后具體特征表現(xiàn)為:200 hPa高空急流范圍擴(kuò)大,強(qiáng)度增強(qiáng);副熱帶高壓不斷東撤,南海地區(qū)不再盛行西南風(fēng);850 hPa上南海地區(qū)盛行西南風(fēng)且對(duì)流大面積爆發(fā);假相當(dāng)位溫隨高度變化的特征顯示出對(duì)流增強(qiáng)的趨勢(shì)。為了探討2019年南海夏季風(fēng)爆發(fā)與ISO的關(guān)系,進(jìn)一步研究發(fā)現(xiàn)2019年存在10~25 d大氣季節(jié)內(nèi)振蕩。一方面,ISO有利于2019年爆發(fā)時(shí)間偏早,另一方面,南海夏季風(fēng)爆發(fā)后從孟加拉灣—印度洋東部低頻對(duì)流多次隨時(shí)間向東北傳播,經(jīng)歷發(fā)展—最強(qiáng)—減弱—抑制—最弱—恢復(fù)的6個(gè)階段,有利于南海地區(qū)偏西風(fēng)增強(qiáng)以及對(duì)流活動(dòng)的爆發(fā)維持,使得其爆發(fā)強(qiáng)度增強(qiáng)。

Abstract:

The NCEP/NCAR reanalysis data was used to perform a circulation analysis on the 2019 height field, OLR field and wind field and was used to calculate the physical quantities such as pseudo-equivalent temperature, southwest wind and vertical wind shear. Then, the Lanczos filter was used to filter the phase and discuss the relationship between ISO and the 2019 South China Sea summer monsoon onset. Results show that the date of the 2019 South China Sea summer monsoon onset is May 6, and its outbreak is too early. The specific characteristics after May 6 are as follows:200 hPa upper level jet range is expanded and its strength is enhanced; the subtropical high continues to withdraw eastward, and the southwest wind no longer prevails in the South China Sea; southwest wind prevails in the South China Sea area at 850 hPa and convection breaks out in large areas; the characteristic that the potential pseudo-equivalent temperature changes with altitude shows the trend of convection enhancement. In order to discuss the relationship between the 2019 South China Sea summer monsoon onset and ISO, further research reveals that there are 10-25 days of intraseasonal oscillations in 2019. On one hand, ISO is conducive to the early outbreak of 2019. On the other hand, after the outbreak, low-frequency convection from the Bay of Bengal-East Indian Ocean propagated to the northeast many times over time, going through six stages of development-strongest-weakening-suppression-weakest-recovery. It is conducive to the enhancement of the westerly wind in the South China Sea and the maintenance of the outbreak of convective activities, which increases its outbreak intensity.

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張穎,王黎娟,趙小芳,鄧順芷.2019年南海夏季風(fēng)爆發(fā)特征及其與10~25 d ISO的關(guān)系.氣象科學(xué),2022,42(3):324-333 ZHANG Ying, WANG Lijuan, ZHAO Xiaofang, DENG Shunzhi. Characteristics of South China Sea summer monsoon onset in 2019 and its relationship with 10-25 d intraseasonal oscillation. Journal of the Meteorological Sciences,2022,42(3):324-333

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收稿日期:2020-10-22
最后修改日期:2021-01-04
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在線(xiàn)發(fā)布日期: 2022-07-15
出版日期: 2022-06-25

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