Final Answer:
Recent research has reported that sub-polar seas bordering the North Atlantic have become noticeably warmer since the mid-1960s, especially in the last decade.
Step-by-step explanation:
The observed warming of sub-polar seas in the North Atlantic since the mid-1960s is a manifestation of long-term climate change. This warming trend is primarily attributed to the increased concentration of greenhouse gases, such as carbon dioxide (CO₂), in the Earth's atmosphere. Greenhouse gases trap heat, leading to a rise in global temperatures and influencing oceanic conditions. The North Atlantic region is particularly sensitive to these changes, with the warming of sub-polar seas having significant implications for marine ecosystems, weather patterns, and sea level rise.
The temperature increase in sub-polar seas is quantified through various scientific measurements, including sea surface temperature (SST) records. Researchers use advanced technologies such as satellite-based remote sensing and in-situ measurements to collect data on SST over time. The analysis of this data reveals a discernible warming trend, with the last decade showing an accelerated rate of increase.
The consequences of this warming extend beyond the immediate region, affecting global climate systems and contributing to phenomena like the melting of Arctic ice. Understanding and monitoring these changes are crucial for assessing the impacts on marine biodiversity, fisheries, and the broader climate system.