印度洋塞舌尔穹隆区海表面温度的年际变化

发布时间：2018-07-15 18:13

【摘要】：利用1959年1月—2008年12月的ECMWF ORA-S3资料,系统研究了印度洋塞舌尔穹隆区不同季节海表面温度(SST)的年际变化特征及其与ENSO、印度洋偶极子、穹隆区的温跃层深度/海面风应力、印尼贯穿流的关系。结果表明,穹隆区的SST在5—6月存在最明显的异常闭合中心(5月的中心值还较热带印度洋其它区域大),而在8—11月最不明显;区域平均的SST年际异常在2月最大,在8—9月最小。一般而言,北半球秋冬季和次年春季的穹隆区SST正(负)异常对应El Ni錺o(La Ni錺a)年或正(负)的印度洋偶极子年,但也有例外,北半球夏季尤其如此。相关分析表明,11月至次年7月(尤其是5月)深(浅)的温跃层对应穹隆区高(低)的SST;而11月至次年3和5月的Ekman抽吸减弱(增强)时,次年1—6月和8月的穹隆区SST升高(降低),其中Ekman抽吸中的2项在总体上起相反作用,但除了对2和8月的SST,风应力旋度项的贡献都占优;风应力大小(蒸发)主要影响10月至次年6月的SST(负相关);当1—2月向北的Ekman输送弱(强)或7—8月向南的Ekman输送强(弱)时,穹隆区的SST高(低);而8—11月的印尼贯穿流流量增大(减小)时,直至次年上半年的穹隆区SST皆升高(降低)。可见无论是穹隆区SST的年际变化本身还是它与不同物理过程/影响因子的关系均存在明显的季节差异性。
[Abstract]:Based on ECMWF ORA-S3 data from January 1959 to December 2008, the interannual variation of sea surface temperature (SST) in the Seychelles Dome of the Indian Ocean and its relation with ENSO, Indian Ocean dipole, Dome are systematically studied. Indonesia's penetrating relationship. The results showed that SST in the dome had the most obvious abnormal closed center in May-June (the center value in May was larger than that in other regions of the tropical Indian Ocean), but it was the least obvious in August and November, and the average interannual SST anomaly in the region was the largest in February. It was the smallest in August and September. Generally speaking, the positive (negative) SST anomalies in the dome of the Northern Hemisphere in autumn, winter and spring correspond to El Ni 帽 o (La Ni 帽 a) or positive (negative) Indian Ocean dipole years, but there are exceptions, especially in the summer of the Northern Hemisphere. The correlation analysis shows that the thermocline from November to July (especially May) corresponds to the high (low) SSTs in the dome, and the Ekman suction weakens (strengthens) in November-May. In January to June and August of the following year, the SST in the dome increased (decreased), in which two items of Ekman suction played an opposite role on the whole, but the contribution of wind stress curl was dominant except for the SSTs in February and August. The magnitude of wind stress (evaporation) mainly affects the SST (negative correlation) between October and June, and when the Ekman transport is weak (strong) to the north or strong (weak) in the south in July-August, The SST of the dome is high (low), and the SST of the dome is higher (lower) than that of the first half of the following year when the through-flow in Indonesia increases (decreases) in August and November. It can be seen that there are obvious seasonal differences between the interannual variation of SST in the dome and the relationship between SST and different physical processes / influence factors.
【作者单位】：中国海洋大学物理海洋实验室山东省高校海洋-大气相互作用与气候重点实验室;莱西市气象局;
【基金】：高等学校博士学科点专项科研基金项目(20110132110016)资助~~
【分类号】：P731.11

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