Seasonal variations of sea level anomaly in the subtropical front zone based on satellite-derived data from 2003-2009
Seasonal variations of sea level anomaly in the subtropical front zone based on satellite-derived data from 2003-2009
复制标题
基于2003-2009年卫星数据的副热带锋区海平面异常季节变化
DOI：
10.1080/14634988.2016.1210451
复制
发表时间：
2016
影响因子：
0.8
通讯作者：
Mao Huabin
中科院分区：
文献类型：
--
作者：
Qiu Chunhua;Chen Jie;Shangguan Maosen;Mao Huabin
利用2003 - 2009年的卫星资料和现场观测资料，分析了西北太平洋副热带锋区海平面异常的季节变化。海平面异常在冷锋区和暖区具有不同的季节变化周期。在前两个带中，海平面异常的峰值出现在7 - 8月（± 15 cm），空值出现在2 - 3月（± 10 cm）;在暖带中，海平面异常没有明显的季节变化。结果表明，海平面距平与海表温度的相关系数在冷锋区达到0.76，而在暖区仅为0.38。空间高度距平对前两带海平面异常的解释率为70%，而对暖带海平面异常的解释率为25%。分析了海平面异常变化的机制，认为海-气热交换引起的空间高度异常控制了前两带海平面异常的季节变化，而伴随副热带逆流的正压项导致暖带海平面异常的季节变化不明显。这些高频变化值得进一步研究。
We investigated seasonal variations in the sea level anomaly in the northwestern Pacific subtropical front zone using weekly satellite-derived products and in situ observations from 2003 to 2009. The sea level anomalies had different seasonal cycles in the cold, front and warm zones. In the former two zones, peak values appeared (∼15 cm) in July–August and hollow values (∼−10 cm) in February–March; in the warm zone, sea level anomalies had no apparent seasonal variations. We found that the correlation between sea level anomaly and sea surface temperature reached values of 0.76 in the cold and front zones, but only 0.38 in the warm zone. The steric height anomaly explained 70% variances of sea level anomaly in the former two zones but only 25% in the warm zone. We examined the mechanisms of the different patterns of sea level anomaly variation among the three different zones and concluded that the steric height anomaly induced by air–sea heat exchanges controlled the seasonal variations of sea level anomaly in the former two zones, while the barotropic term accompanied with subtropical countercurrent lead to the obscure seasonal variations in the warm zone. These high frequency variations merit future study.