海洋科学
海洋科學
해양과학
MARINE SCIENCES
2013年
12期
62-67
,共6页
北赤道流(NEC)%年际变化%副热带环流%海表高度%EI Ni?o-Southern Oscillation (ENSO)
北赤道流(NEC)%年際變化%副熱帶環流%海錶高度%EI Ni?o-Southern Oscillation (ENSO)
북적도류(NEC)%년제변화%부열대배류%해표고도%EI Ni?o-Southern Oscillation (ENSO)
the North Equatorial Current(NEC)%interannual variability%subtropical gyre%sea surface height%EI Ni?o-Southern Oscillation (ENSO)
基于日本气象厅在1967~2009年间获得的温盐深仪(CTD)资料以及美国提供的卫星高度计资料,分析了137°E 断面北赤道流(NEC)的结构特征和年际变化,并探讨了其年际变化的控制机制。结果表明,在137°E断面, NEC的平均位置位于8°~18°N,其流核出现在10°~12°N附近；无论冬季还是夏季, NEC的流速距平场都具有南、北向的反位相年际振荡特征,而这种南、北向的反位相振荡可能是由热带西北太平洋的气旋性和反气旋性异常环流所控制； NEC内部的流速对EI Ni?o-Southern Oscillation (ENSO)的响应也存在着明显的季节特征,其中,在El Ni?o(La Ni?a)期间的夏季, NEC中上部的流速增大(减小)；在El Ni?o(La Ni?a)期间的冬季, NEC中下部的流速减小(增大),而NEC南、北两侧的流速则增大(减小)。
基于日本氣象廳在1967~2009年間穫得的溫鹽深儀(CTD)資料以及美國提供的衛星高度計資料,分析瞭137°E 斷麵北赤道流(NEC)的結構特徵和年際變化,併探討瞭其年際變化的控製機製。結果錶明,在137°E斷麵, NEC的平均位置位于8°~18°N,其流覈齣現在10°~12°N附近；無論鼕季還是夏季, NEC的流速距平場都具有南、北嚮的反位相年際振盪特徵,而這種南、北嚮的反位相振盪可能是由熱帶西北太平洋的氣鏇性和反氣鏇性異常環流所控製； NEC內部的流速對EI Ni?o-Southern Oscillation (ENSO)的響應也存在著明顯的季節特徵,其中,在El Ni?o(La Ni?a)期間的夏季, NEC中上部的流速增大(減小)；在El Ni?o(La Ni?a)期間的鼕季, NEC中下部的流速減小(增大),而NEC南、北兩側的流速則增大(減小)。
기우일본기상청재1967~2009년간획득적온염심의(CTD)자료이급미국제공적위성고도계자료,분석료137°E 단면북적도류(NEC)적결구특정화년제변화,병탐토료기년제변화적공제궤제。결과표명,재137°E단면, NEC적평균위치위우8°~18°N,기류핵출현재10°~12°N부근；무론동계환시하계, NEC적류속거평장도구유남、북향적반위상년제진탕특정,이저충남、북향적반위상진탕가능시유열대서북태평양적기선성화반기선성이상배류소공제； NEC내부적류속대EI Ni?o-Southern Oscillation (ENSO)적향응야존재착명현적계절특정,기중,재El Ni?o(La Ni?a)기간적하계, NEC중상부적류속증대(감소)；재El Ni?o(La Ni?a)기간적동계, NEC중하부적류속감소(증대),이NEC남、북량측적류속칙증대(감소)。
The velocity structure and interannual variability of the North Equatorial Current (NEC) and its controlling mechanism were investigated based on the CTD data along the 137°E section obtained by Japan Meteorological Agency (JMA) from 1967 to 2009 and satellite altimetric sea surface height (SSH) data. The results show that the NEC is located between 8°N and 18°N, with a velocity core at 10°~12°N along the 137°E section. The EOF analysis revealed similar patterns in leading modes both in summer and winter, showing out-of-phase interannual variations for the southern and northern parts of the NEC. This phenomenon of the NEC may be controlled by abnormal cyclone and anticyclone circu-lation in the tropical western Pacific. The velocity filed in the NEC had different response to ENSO in summer compared to that in winter. In El Ni?o (La Ni?a) summer, the velocities in the upper and central NEC were strong (weak), while in El Ni?o (La Ni?a) winter, the velocities in the central and deep NEC were weak (strong).
