Final answer:
Sea Surface Temperature (SST) at high latitudes is changing due to climate change, with temperatures increasing at a faster rate. This has implications for the marine ecosystem and polar ice melt.
Step-by-step explanation:
SST stands for Sea Surface Temperature. The change in SST at high latitudes refers to the change in temperature of the ocean surface in the regions closer to the poles. Due to climate change, temperatures in high latitudes are increasing at a faster rate compared to other regions. This has significant impacts on the marine ecosystem and ice melt in the polar regions.