盛夏海南島防區(qū)臺(tái)風(fēng)累積動(dòng)能氣候異常特征分析

doi:10.12306/2021jms.0007

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盛夏海南島防區(qū)臺(tái)風(fēng)累積動(dòng)能氣候異常特征分析
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                        10.12306/2021jms.0007
                    
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中圖分類號(hào):P466
基金項(xiàng)目:海南省氣象局科研項(xiàng)目（HNQXJS202003；HNQXJS201803）；海南省重點(diǎn)研發(fā)計(jì)劃項(xiàng)目（ZDYF2019113）；國(guó)家自然科學(xué)基金資助項(xiàng)目（41765005）

Anomalous climatic characteristics of accumulated cyclone energy in Hainan Island defense area during midsummer

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利用1981—2018年CMA-STI熱帶氣旋最佳路徑數(shù)據(jù)集、NCEP/NCAR再分析資料和OA Flux3潛熱通量數(shù)據(jù)，分析了盛夏海南島臺(tái)風(fēng)累積動(dòng)能（Accumulated Cyclone Energy，ACE）氣候特征及異常年大氣環(huán)流形勢(shì)和相關(guān)物理量特征。結(jié)果表明：1981—2018年盛夏海南島ACE呈先下降后上升的變化趨勢(shì)，同時(shí)具有明顯年代際特征，2010年后存在準(zhǔn)2 a顯著周期。盛夏ACE偏高（低）年，西太副高偏大（小）偏強(qiáng)（弱）偏西（東），其南側(cè)伴有偏強(qiáng)（弱）的季風(fēng)槽，臺(tái)風(fēng)北側(cè)對(duì)流（不）活躍；低層防區(qū)內(nèi)存在異常氣旋式切變（反氣旋式環(huán)流），海南受偏東（西）異常氣流影響，有利（不利）于對(duì)流、水汽等向臺(tái)風(fēng)環(huán)流并入而加強(qiáng)（削弱）臺(tái)風(fēng)，120°~130°E越赤道氣流（不）活躍；菲律賓以東至南海高空抽吸作用偏強(qiáng)（弱），盛行異常上升（下沉）運(yùn)動(dòng)，且環(huán)境風(fēng)垂直切變偏小（大）；東?！毡竞摕嵬科。ù螅?，熱帶西太平洋及南海低層為水汽輻合（散）區(qū)。

Abstract:

Based on the CMA-STI tropical cyclone optimal track data from 1981 to 2018, NCEP/NCAR reanalysis data and OA Flux3 latent heat flux data, the climatic characteristics of accumulated cyclone energy (ACE) in Hainan Island in midsummer and the characteristics of atmospheric circulation background and related physical quantity in anomalous years were analyzed. The results showed that, the ACE index of Hainan Island of in midsummer showed a trend of first decreasing then increasing from 1981 to 2018. Meanwhile, it presented an obvious decadal characteristic, and there was a quasi-two-year significant cycle after 2010. In the high (low) ACE years, the western Pacific subtropical high was big (small), strong (weak) and westward (eastward), with a strong (weak) monsoon trough on the south side of the subtropical high, which made the convection on the north side of the typhoon active (inactive). In the lower levels, there was abnormal cyclonic shear (anticyclonic circulation) in the typhoon protection zone, and Hainan Island was affected by abnormal easterly (westerly) flow, which was favorable (unfavorable) for convection, water vapor to merge into typhoon circulation and strengthen (weaken) the typhoon. Moreover, the equatorial flow was active (inactive) at 120°-130°E. The suction effect at high altitude was relatively stronger (weaker) from east of the Philippines to the South China Sea, and the anomalous upward (downward) movement prevails, meanwhile the vertical shear of ambient wind was weaker (stronger). The latent heat flux around the East China Sea and the Sea of Japan was relatively smaller (larger), and in the lower layer, the tropical western Pacific and the South China Sea were the moisture convergence (divergence) region.

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邢彩盈,張亞杰,吳勝安,朱晶晶.盛夏海南島防區(qū)臺(tái)風(fēng)累積動(dòng)能氣候異常特征分析.氣象科學(xué),2023,43(2):270-277 XING Caiying, ZHANG Yajie, WU Sheng'an, ZHU Jingjing. Anomalous climatic characteristics of accumulated cyclone energy in Hainan Island defense area during midsummer. Journal of the Meteorological Sciences,2023,43(2):270-277

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收稿日期:2020-06-24
最后修改日期:2020-11-16
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在線發(fā)布日期: 2023-05-20
出版日期: 2023-04-15

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