Press direct line: +1 303.492.1497. Throughout the month, sea ice grew by an average of 71,200 square kilometers (27,500 square miles) per day, which is close to the average rate for 1981 to 2010. Figure 3. The increased ice cover compared to the last decade is due to a strong polar vortex. Since then, Antarctic sea ice has declined by 1.30 million square kilometers (502,000 million square miles), but at a rate slightly slower than the average, resulting in a slight increase in the difference between the daily sea ice extent and the 1981 to 2010 average. Sea ice growth in the last 10 days of the month was mostly along the Siberian coast, extending northward, and along the Eurasian side of the sea ice pack, extending southward. If all of the ice in Antarctica melts, it will raise the sea levels all over world at about 61 meters or 200 feet. Sea ice concentration is the percent areal coverage of ice within the data element (grid cell). This excess heat transferred to the atmosphere can be seen in a vertical profile of temperature by latitude along longitude 140 to 170 degrees E, which cuts though the open water area along the Eurasian coast (Figure 4a). This chart shows monthly sea ice extent anomaly (difference from the 1981 to 2010 average) for 1979 to October 2020. Looking for facts and information? Earth’s polar ice caps are mostly water-based ice. The vertical line represents the last data point plotted. The monthly average ice extent for October is the lowest in the satellite record. October 2020 is the largest departure from average conditions seen in any month thus far in the satellite record, falling 3.69 standard deviations below the 1981 to 2010 mean. The vertical line represents the last data point plotted. Read their blog ... Icelights: Answers to your burning questions about ice and climate. Few organisms have adapted to life on an ice cap, although many plants and animals live on the cold periphery. Sea Ice Index data. Shown below are up-to-date satellite observations of the sea ice covers of both the Arctic and the Antarctic, along with comparisons with the historical satellite record of more than 37 years. Credit: Center for High North Logistics Information Office at Nord University High-resolution image. The average sea level pressure pattern for October was characterized by below-average pressure over the Northern Atlantic Ocean and Laptev and Bering Seas, driving winds northward toward the Lena River region, Barents Sea, and Novaya Zemlya. Notably, in the last few days of the month, sea ice concentration dropped in the area of the Maud Rise and in an area near the front of the Amery Ice Shelf. This corresponds to a downward trend of -84,400 square kilometers (32,600 square miles) per year, or losing an area about the size of South Carolina each year. This figure shows a profile of temperature (in color) for the lower half of the atmosphere (500 to 1,000 millibars, or about 18,000 feet to the surface) versus latitude, averaged along a swath of longitudes from 140 to 170 degrees E. With longer periods of open water during spring and summer, more solar energy is absorbed within the upper part of the ocean. A vast area of the Arctic Ocean remains ice free as November begins, far later in the season than is typical. Temperatures in Central Canada were 1 to 4 degrees Celsius (2 to 7 degrees Fahrenheit) below average (Figure 2b). How Fast Are Polar Ice Caps Melting? The extents in km2 for the current and for the years of minimum and maximum extents are provided below the image. The increase in August activity between 2018, 2019, and 2020 is shown in the bar chart at upper left. The 1981 to 2010 median is in dark gray. Sea ice extent is the integral sum of the areas of all grid cells with at least 15% ice concentration, while sea ice area is the integral sum of the product of ice concentration and area of all grid cells with at least 15% ice concentration. We provide an update during the first week of each month, or more frequently as conditions warrant. A satellite-based data record starting in late 1978 shows that indeed rapid changes have been occurring in the Arctic, where the ice coverage has been declining at a substantial rate. This plot shows Arctic sea ice extent anomalies for those five years from June to December compared with the 1981 to 1990 average, 1991 to 2000 average, and the 2001 to 2010 average.Credit: National Snow and Ice Data Center High-resolution image, Figure 4c. Researchers Walt Meier, Ted Scambos, Mark Serreze, and Julienne Stroeve regularly contribute to ASINA, sometimes featuring guest authors, and with support from Kevin Beam, Andy Barrett, Lisa Booker, Michael Brandt, Florence Fetterer, Matt Fisher, Agnieszka Gautier, Marin Klinger, Jonathan Kovarik, Jed Lenetsky, Luis Espinosa Lopez, Audrey Payne, Bruce Raup, Matt Savoie, Trey Stafford, Bruce Wallin, and Ann Windnagel. The gray areas around the median line show the interquartile and interdecile ranges of the data. —Credit: National Snow and Ice Data Center. On Mars, polar ice caps are a combination of water ice and solid carbon dioxide. Sea Ice Index data.Credit: National Snow and Ice Data CenterHigh-resolution image, Figure 2b.
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