格陵兰努普·康格鲁阿峡湾叶绿素a浓度时空变化分析

Temporal and spatial variation of Chlorophyll a concentration in Nuup Kangerlua Fjord,Greenland

努普·康格鲁阿(Nuup Kangerlua)峡湾的叶绿素a(Chl a)浓度的时空分布对于气候变化有一定的指示作用。基于此,结合通过C2RCC算法对Sentinel-3 OLCI反演得到的Chl a数据、OSTIA海表面温度(SST)数据以及Nuuk气象站数据,对2016—2020年该区域的Chl a浓度分布进行时空分析。结果表明,在峡湾入口端,Chl a的分布主要受风力和海温的影响,在9月风力最强盛时达到最大;而在冰川出水口端,除风力和水温外,在冰川融水的作用下,浮游植物在春季爆发后,还伴随有秋季二次爆发。

The temporal and spatial distribution of Chlorophyll a(Chl a)concentration in Nuup Kangerlua Fjord is an indicator of climate change.The spatiotemporal distribution of Chl a concentration in this region from 2016 to 2020 was therefore analyzed by combining the Chl a data obtained from Sentinel-3 OLCI inversion by C2RCC algorithm,Operational Sea Surface Temperature and Ice Analysis(OSTIA)sea surface temperature(SST)data,and data from a nearby meteorological station(at Nuuk).The results show that the distribution of Chl a was mainly affected by wind speed,wind direction and SST at the fjord inlet.The peak time of Chl a concentration was about one month later than that of SST and is most widespread when the winds are at their strongest in September.At the outlet of the glacier,in addition to being influenced by wind and water temperature,the spring bloom of Chl a is followed by a second bloom in autumn,driven by meltwater from glaciers.