During these months of dark or near-darkness, the greenhouse effect is less important, she explains. In 1988, ice that was at least 4 years old accounted for 26% of the Arctic's sea ice. Sea ice surrounding Antarctica reached a new record high extent this year, covering more of the southern oceans than it has since scientists began a long-term satellite record to map the extent in the late 1970s. The amount of multi-year sea ice in the Arctic has declined considerably in recent decades. About 15 percent of the world's oceans are covered by sea ice during part of the year. While sea ice exists primarily in the polar regions, it influences the global climate. It provides consistently processed daily ice extent and concentration images and data since 1979. A new study looking at microplastics in Arctic sea ice recently published in the journal Nature Communications found a record amount of the microplastics in the ice, surprising even veteran scientists contributing At that time, little light shines on the area. By 2013, ice that age was only 7% of all Arctic sea ice. It has been a focus of attention in recent years, largely because of a strong decrease in the Arctic sea ice cover and modeling results that indicate that global warming could be amplified in the Arctic on account of ice-albedo feedback. We find that CMIP6 models produce a wide spread of mean Arctic sea‐ice area, capturing the observational estimate within the multimodel ensemble spread. Scientists are using satellite data to measure and map the amount of snow on Arctic sea ice. Daily extent images show ice extent at concentrations greater than 15% for a given day with an outline of the typical extent for that day based on a 30-year (1981-2010) median (orange line). For the most part, sea ice expands during winter months and melts during summer months, but in certain regions, some sea ice remains year-round. The post Mapping the Amount of Snow on Arctic Sea Ice appeared first … But just as the summer minimum of Arctic sea ice has been falling, so has the maximum sea ice present in winter. The daily Sea Ice Index provides a quick look at Arctic-wide changes in sea ice. We examine CMIP6 simulations of Arctic sea‐ice area and volume. The Arctic may be thousands of miles from the planet’s largest cities and fastest booming populations, but that doesn’t mean it’s free of human junk.
Even with ground-based monitoring, what has been a challenge is measuring and mapping the amount of snow on Arctic sea ice, given the wide spatial extent of the Arctic and polar regions in general. Sea ice cover in the Arctic reaches its peak during winter, she notes. The sea ice cover is one of the key components of the polar climate system.
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