CAJ | 학술논문

利用NCEP/NCAR再分析格点资料普查1950-2004年南海夏季风爆发前后850 hPa的天气形势图,发现大多数年份,在南海夏季风建立的前5天,菲律宾以南海域(0～10°N,125～140°E)常伴有一次西太平洋热带涡旋的活动过程.选取南海夏季风爆发偏早的2001年进行个例分析,结果表明随着西太平洋热带涡旋的发展和移动,南海地区的正涡度不断增加,使得西太平洋副热带高压减弱东退,南海夏季风爆发.对涡旋区和南海地区的涡度、热源、水汽汇等进行区域平均,发现南海地区正涡度的增大,热源、水汽汇的加强很大程度上是由于西太平洋热带涡旋作用所致,西太平洋热带涡旋的作用可能是2001年南海夏季风爆发的重要因子之一.
이용NCEP/NCAR재분석격점자료보사1950-2004년남해하계풍폭발전후850 hPa적천기형세도,발현대다수년빈,재남해하계풍건립적전5천,비률빈이남해역(0～10°N,125～140°E)상반유일차서태평양열대와선적활동과정.선취남해하계풍폭발편조적2001년진행개례분석,결과표명수착서태평양열대와선적발전화이동,남해지구적정와도불단증가,사득서태평양부열대고압감약동퇴,남해하계풍폭발.대와선구화남해지구적와도、열원、수기회등진행구역평균,발현남해지구정와도적증대,열원、수기회적가강흔대정도상시유우서태평양열대와선작용소치,서태평양열대와선적작용가능시2001년남해하계풍폭발적중요인자지일.
Using NCEP/NCAR reanalysis data to survey 1950-2004 year's synoptic chart during the time of South China Sea Monsoon(SCSM) eruptions, we find out during most years, before the eruption of SCSM, the West Pacific Tropical Vortex always appears in the sea area to the south of Philippine(0 ～ 10°N, 125 ～ 140 °E). Then choosing the 2001-year which SCSM erupted earlier than normal as an example and making analysis, the results indicate that the development and movement of West Pacific Tropical Vortex augment the local vorticity of Nanhai area where used to be controlled by the ridge of Subtropical High. And the positive vorticity of Nanhai area is increasing constantly, forcing the ridge of Subtropical High weaker and weaker, after the Subtropical High moves eastward, the SCSM breaks out. At last, averaging the vortex area's and Nanhai area's vorticity, heat source, water vapor sink etc, we find that the increasement of positive vorticity, heat source, water vapor sink in Nanhai area may be caused by the West Pacific Tropical Vortex actives.