CAJ | 학술논문

利用美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration，简称NO-An）的逐日对外长波辐射（outgoing longwave radiation，简称OLR）场资料，欧洲中期天气预报中心（European Center for Medium—Range Weather Forecasting，简称ECMWF）逐日风场（850hPa）资料，以及美国联合台风预警中心（Joint Typhoon Warning Center，简称JTWC）的热带气旋（tropicalcy—clone，简称TC）数据，参考Wheeler and Hendon（2004）提出的季节内振荡（Madden—Julianoscilla．tion，简称MJO）指数，通过多元EOF方法定义热带准双周振荡（quasi—biweekly oscillation，简称QBW）指数，诊断分析了西北太平洋地区QBW不同位相对于TC路径的影响。结果表明，TC主要生成在QSW对流湿位相中，集中位置随QBW向西北的传播而向西北移动。在QSW位相phasel中，南海上空盛行QBW反气旋性环流，西太副高西伸，其西南侧偏东南气流受QBW反气旋性环流东北侧气流抑制，生成在副高南侧的TC首先在副高南侧偏东气流的引导下移动至近海，在西南季风以及副高西侧偏南气流作用下顺时针北折，因此在140°E以西转折类路径的TC比例最高；而在phase3中，西太副高偏东，南海上空盛行QBW气旋性环流，西太副高西南侧气流强度受QBW气旋东北侧气流影响增强，季风槽偏东，140°E以东转折类的TC比例最高。本文还对TC个例中的QBW流场形势进行了分析，发现当QBW气旋或反气旋环流中心同TC中心一致时，热带气旋路径会发生突然的右折。
이용미국국가해양화대기관리국（National Oceanic and Atmospheric Administration，간칭NO-An）적축일대외장파복사（outgoing longwave radiation，간칭OLR）장자료，구주중기천기예보중심（European Center for Medium—Range Weather Forecasting，간칭ECMWF）축일풍장（850hPa）자료，이급미국연합태풍예경중심（Joint Typhoon Warning Center，간칭JTWC）적열대기선（tropicalcy—clone，간칭TC）수거，삼고Wheeler and Hendon（2004）제출적계절내진탕（Madden—Julianoscilla．tion，간칭MJO）지수，통과다원EOF방법정의열대준쌍주진탕（quasi—biweekly oscillation，간칭QBW）지수，진단분석료서북태평양지구QBW불동위상대우TC로경적영향。결과표명，TC주요생성재QSW대류습위상중，집중위치수QBW향서북적전파이향서북이동。재QSW위상phasel중，남해상공성행QBW반기선성배류，서태부고서신，기서남측편동남기류수QBW반기선성배류동북측기류억제，생성재부고남측적TC수선재부고남측편동기류적인도하이동지근해，재서남계풍이급부고서측편남기류작용하순시침북절，인차재140°E이서전절류로경적TC비례최고；이재phase3중，서태부고편동，남해상공성행QBW기선성배류，서태부고서남측기류강도수QBW기선동북측기류영향증강，계풍조편동，140°E이동전절류적TC비례최고。본문환대TC개례중적QBW류장형세진행료분석，발현당QBW기선혹반기선배류중심동TC중심일치시，열대기선로경회발생돌연적우절。
By using outgoing longwave radiation （OLR） data from National Oceanic and Atmospheric Administration（NOAA） ,daily wind （850 hPa） data from European Center for Medium-Range Weath-er Forecasting（ECMWF） and tropical cyclones （TC） data from Joint Typhoon Warning Center （JT-WC）, the impact of quasi-biweekly oscillation （QBW） on tropical cyclone activity over the western North Pacific（WNP） is studied in this paper. The index of 10 to 20-day oscillation is defined by refer-ring to the Madden-Julian oscillation （MJO） index proposed by Wheeler and Hendon （2004）. The anal-ysis shows that TCs always occur in the area where convection is active. During QBW-phasel, the southeasterly of the western North Pacific subtropical high is weakened by the anticyclone-circulation of QBW. The westward （northwestward） moving TCs tend to change their tracks to the west of 140°E. During QBW-phase3, with the southeasterly of the western North Pacific subtropical high strengthened by the cyclone-circulation of QBW, TCs tend to change their tracks to the east of 140°E. Case studies of some TCs are discussed in this paper. The results show that TCs may present sudden poleward track change while its center overlaps with the center of the cyclone-circulations （anticyclone-circulations） of QBW.