Spatial and temporal trends of remotely sensed sea-ice cover, sea surface temperatures, chlorophyll-a concentration and primary production in the Baffin Bay, Davis Strait and Labrador Sea were analyzed for the 1998–2017 period. We found spatial variability in the trends of these cryospheric, biologic and oceanographic phenomena. For example, in the northern Baffin Bay, we observed decreases in annual sea-ice persistence, yet increases along the Labrador Sea-ice edge during winter, with the latter having significant correlations with broader atmospheric patterns. In general, we observed increases in summer sea surface temperatures across the study region, except a small area of cooling along the southern Greenlandic coast. We also found significant negative trends in April chlorophyll-a and primary production followed by significant positive trends for both biological phenomena in May, owing to anomalously high values in 2014 and 2015. Notably, we found a significant positive correlation between days of monthly sea ice presence in April with May primary production quantities. Finally, we found a significant positive trend in total annual primary production over the study period. This novel finding suggests an important relationship between the timing of breakup along the sea-ice edge and peaks in biological production.

中文翻译：

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边缘的变化：西北大西洋/南北极交界处的海冰、海洋温度和海洋颜色的趋势

遥感海冰覆盖、海面温度、叶绿素-一种分析了 1998-2017 年期间巴芬湾、戴维斯海峡和拉布拉多海的浓度和初级生产。我们发现这些冰冻圈、生物和海洋现象的趋势存在空间变异性。例如，在巴芬湾北部，我们观察到年海冰持久性下降，但在冬季沿拉布拉多海冰边缘增加，后者与更广泛的大气模式具有显着相关性。总的来说，我们观察到整个研究区域的夏季海面温度有所上升，除了格陵兰岛南部海岸的一小部分冷却区域。我们还发现 4 月叶绿素的显着负面趋势-一种由于 2014 年和 2015 年的异常高值，我们发现 4 月海冰存在天数与 5 月初级生产量之间存在显着的正相关关系。最后，我们发现在研究期间，年度初级生产总量呈现显着的积极趋势。这一新发现表明沿海冰边缘破裂的时间与生物生产高峰之间存在重要关系。