近日，我室与南京大学联合培养的硕士生李海丽在IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing上发表了有关北极气旋对海洋水色参数影响的相关论文，通讯作者为我室王迪峰研究员。

      北极气旋是北极频繁发生的天气系统，影响范围大，会给脆弱的北极生态系统带来巨大影响。论文利用欧洲中期天气预报中心提供的再分析数据识别与追踪了2012年7月发生在喀拉海的一场超大气旋（图1），该气旋由大气旋、小气旋和陆地气旋组成，为期10天。以该气旋为案例研究了气旋前后叶绿素a（Chl-a）浓度和海表温度（SST）的变化，得到气旋对两者的影响。研究表明，气旋过境会带来Chl-a浓度的增加和SST的降低（图2和图3）。近岸Chl-a浓度增量大于陆架区，陆架区增量大于深海区。近岸区Chl-a浓度增量最高超过5mg/m3（表2）。近岸SST下降量大于陆架和深海，近岸最大下降量超过4℃（图3）。近岸Chl-a浓度和SST变化量大则主要是由于降水量的增加，陆地径流增大，带来陆源营养盐和额外的冷水。

引用：Li, H., D. Pan, D. Wang, F. Gong, Y. Bai, X. He, Z. Hao and C. Ke. The Impact of Summer Arctic Cyclones on Chlorophyll-a Concentration and Sea Surface Temperature in the Kara Sea. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2019, 12(5): 1396-1408.

Fig. 1. The Arctic cyclones of July 2012 in the Kara Sea (The label format is mmdd:hh. mm means the month when cyclone occurred; dd means the day; hh means hour).

Fig.2. Variation of Chl-a concentration due to the passage of Arctic cyclones (a) Difference between land cyclone and before the cyclone; (b) Difference between great cyclone and before the cyclone; (c) Difference between week 1 post-cyclone and before the cyclone; (d) Difference between week 2 post-cyclone and before the cyclone.