Since 1979, there has been an increase in Antarctic sea ice extent.

23, 2020 , 11:30 AM. A newly completed 40-y record of satellite observations is used to quantify changes in Antarctic sea ice coverage since the late 1970s.

If we consider the entire Holocene, the Antarctic sea ice levels during the past 100 years or so are the While it is true that the poles experience constant changes in climate, they are not under threat from the ongoing changes in climate. But in every single month, the error bar exceeded the trend: year-to-year variability dwarfed long-term trends.Land-sea configurations affect sea ice extents not only by limiting where ice can form, but also by introducing their own effects. Weather events often drive variability, but have different effects in the Northern and Southern Hemispheres. What do the changes in the Arctic and the Antarctica really entail?The Arctic is more often used in climate doomsday narratives than Antarctica. Compared to the Arctic, Antarctic sea ice shows less variability in summer, and more variability in winter. This graph shows monthly ice extent anomalies plotted as a time series of percent difference between the extent for the month in question and the mean for that month based on the January 1981 to December 2010 data. The amount of summer sea ice in the Arctic has been steadily shrinking over the past few decades. The heavy snow burden can depress ice floes, and seawater can subsequently flood those floes.Young, thin ice floats in the Amundsen Sea on October 16, 2009. Antarctic sea ice expands during the winter, only to melt back largely to the continent’s edge in summer. These changes largely result from the geographic differences mentioned above, namely Antarctic sea ice’s distance from the pole (sea ice can melt ba… The anomaly data points are plotted as plus signs and the trend line is plotted with a dashed grey line.
Given the The mainstream media use short-term changes in sea-ice extent, and even shorter-term changes in temperature to make sensational claims about sea-ice melt and global warming. These changes largely result from the geographic differences mentioned above, namely Antarctic sea ice’s distance from the pole (sea ice can melt back all the way to the coast in summer, making for less year-to-year variability) and unconstrained growth potential in winter. Image credit: Michael Marsland (Yale University, New Haven, CT).We need evidence-based answers in order to create migration policies that balance The Arctic and the Antarctic are the darlings of the climate doomsday movement. Sea ice spreads over vast areas and has major impacts on the rest of the climate system, reflecting solar radiation and restricting ocean/atmosphere exchanges. The sea ice cover is one of the key components of the polar climate system. As a result, Antarctic sea ice is relatively thin, often 1 meter (about 3 feet) or less. This dramatic reversal in the changes occurring in the Antarctic sea ice will provide valuable further information to test earlier suggested explanations of the long-term Antarctic sea ice increases. This graph provides a snapshot of changes in ice extent for the last four months. Photo captured by the DMS camera on the first flight of NASA’s Operation Ice Bridge Campaign.

The rapid decreases reduced the Antarctic sea ice extents to their lowest values in the 40-y record, both on a yearly average basis (record low in 2017) and on a monthly basis (record low in February 2017).Following over 3 decades of gradual but uneven increases in sea ice coverage, the yearly average Antarctic sea ice extents reached a record high of 12.8 × 10Since the late 1990s, it has been clear that the Arctic sea ice cover has been decreasing in extent over the course of the multichannel passive-microwave satellite record begun in late 1978 (The Antarctic situation has been quite different, with sea ice extent increasing overall for much of the period since 1978 (In the meantime, while the unexpected, decades-long overall increases in Antarctic sea ice extent are still being puzzled out, the sea ice extent has taken a dramatic turn from relatively gradual increases to rapid decreases. On average, about 40 percent of the Arctic Ocean’s winter ice cover remains at the summer minimum, whereas in the Southern Ocean only about 15 percent does. For example, the monthly deviation for January 1979 is the ice extent for January 1979 minus the average of the ice extents for the 40 months of January 1979–2018.Trend lines are calculated for the monthly, seasonal, yearly, and monthly deviation datasets through standard linear least squares, and the standard deviations (SDs) of the trends are calculated based on the technique described by Taylor (The satellite passive-microwave datasets are available at the National Snow and Ice Data Center (NSIDC) in Boulder, CO, and on the NSIDC website, Slopes and SDs of the lines of linear least squares fit for the yearly sea ice extents in the full Southern Ocean and each of the 5 sectors identified in For the Southern Ocean as a whole, the quite prominent annual cycle has minimum monthly ice extent always (for the 40 y of the dataset, 1979–2018) occurring in February and always well under 5 × 10The 5 sectors also all exhibit a strong annual cycle with monthly ice extent minima frequently in February and maxima frequently in September, although with much greater interannual variability than for the Southern Ocean as a whole. The sea-ice cover today is at its highes t …

Since September This recent shift does not necessarily signify a change in the long-term trend.
Sea ice is frozen ocean water that melts each summer, then refreezes each winter. (Meanwhile, the Satellite images of sea ice off the Oates Coast of Antarctica on October 7, 2018, (left) and January 12, 2019 (right). It is a source for consistently processed ice extent and concentration images and data values since 1979. Sea ice waxes and wanes with the seasons, but minimum and maximum extents rarely match from year to year; over years and decades, summer and winter extents vary. (In the Arctic, multiyear ice that survives at least one summer is generally 3 to 4 meters thick, and even seasonal ice that formed since the previous summer can often reach about 2 meters in thickness.)

Because so little Antarctic ice persists through the summer, the majority of Antarctica’s sea ice is only one winter old at most.

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