Two degrees Celsius. That’s the redline. The average global temperature increase we need to keep below, according to the 2015 Paris Agreement. But as the Washington Post points out in two heavily mapped stories—one for the United States, one for the entire world—that show the change in average temperatures since the late 1800s, there are places on the planet that have already blown past that two-degree limit. [Maps Mania]
Satellite imagery only goes back so far. To measure the rate of ice loss across the Himalayan glaciers, researchers turned to recently declassified spy satellite photos from 1975. The photos were used to create a digital elevation model (above) which was compared with more recent data. They concluded that the rate of ice loss was accelerating: it was twice as much from 2000 to 2016 than it was from 1975 to 2000. Columbia University, Science News. [Geography Realm]
From last April: Worldmapper’s cartograms showing where in the world CO2 emissions are coming from, both in terms of overall emissions (by area) and per capita (colour). China, the U.S. and India are the largest emitters, but on a per capita basis the U.S. emits twice as much CO2 as China and eight times as much as India. Additional cartograms looking at the increase or decline in CO2 emissions (from 1990 to 2015) show increases mainly in China and the rest of Asia, and declines in Europe and the former Soviet bloc (a lot of the latter due to post-Soviet deindustrialization).
Climate change means retreating glaciers, which exposes new islands, which means new maps. BBC News reports that five new islands off the northeast coast of Novaya Zemlya, an archipelago in the Russian Arctic that was the site of hundreds of nuclear tests, were mapped by a Russian expedition. The islands were discovered in satellite photos by then-student Marina Migunova, now a naval oceanographic engineer.
Previously: New Map of Greenland and the European Arctic.
This is a map of Antarctic surface ice velocity: the speed at which glaciers flow. It was produced by researchers at the University of California Irvine and the Jet Propulsion Laboratory, using radar interferometry and multiple satellite passes to produce a map 10 times more accurate than previous maps. More: UCI News, Geophysical Research Letters.
The British Antarctic Survey—which despite its name focuses its attention on both polar regions—has released a new one-sheet map of Greenland and the European Arctic. The 1:4,000,000-scale map covers a region from Baffin Island to Novaya Zemlya to Scotland: a region that’s usually on the edges of maps of the Arctic and Europe rather than getting its own map. More importantly, it’s a very recent snapshot of a rapidly changing region: the retreating ice sheet in Greenland is revealing new landscapes. The map costs £12 and is available either folded or rolled from Stanfords and the Scott Polar Research Institute. [BBC]
Climate change is redrawing the map, writes Nicola Jones in a piece for Yale Environment 360 last October. It’s not just about polar ice caps, she writes: “Sometimes, the lines on the map can literally be redrawn: the line of where wheat will grow, or where tornadoes tend to form, where deserts end, where the frozen ground thaws, and even where the boundaries of the tropics lie.” Her article is punctuated by maps showing the changes in Earth’s climate zones, some of which dramatically and in a short period of time.
The Climate Atlas of Canada’s interactive map shows the future impact of climate change in Canada. It shows what a number of different weather variables—temperature, number of very hot or very cold days, precipitation, growing season, and so forth—would be under two potential scenarios: one high-carbon, one low-carbon. There’s a lot of data hidden behind a lot of menus; the legends are hidden behind dialog boxes as well. [CBC News]
Global sea level rise has been accelerating in recent decades, according to a new study based on 25 years of NASA and European satellite data. This acceleration has been driven mainly by increased ice melting in Greenland and Antarctica, and it has the potential to double the total sea level rise projected by 2100[. …]
The rate of sea level rise has risen from about 2.5 millimeters (0.1 inch) per year in the 1990s to about 3.4 millimeters (0.13 inches) per year today. These increases have been measured by satellite altimeters since 1992, including the TOPEX/Poseidon, Jason-1, Jason-2, and Jason-3 missions, which have been jointly managed by NASA, France’s Centre national d’etudes spatiales (CNES), the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT), and the U.S. National Oceanic and Atmospheric Administration (NOAA). The maps on this page depict the changes in sea level observed by those satellites between 1992 and 2014.
NASA’s Jet Propulsion Laboratory: “New maps of Greenland’s coastal seafloor and bedrock beneath its massive ice sheet show that two to four times as many coastal glaciers are at risk of accelerated melting as previously thought. Researchers at the University of California at Irvine (UCI), NASA and 30 other institutions have published the most comprehensive, accurate and high-resolution relief maps ever made of Greenland’s bedrock and coastal seafloor. Among the many data sources incorporated into the new maps are data from NASA’s Ocean Melting Greenland (OMG) campaign.”
Using elevation data from stereo satellite observations, David Shean is mapping the retreat of some 1,200 mountain glaciers in the continental United States. “Until recently, glaciers in the United States have been measured in two ways: placing stakes in the snow, as federal scientists have done each year since 1957 at South Cascade Glacier in Washington state; or tracking glacier area using photographs from airplanes and satellites.” Shean’s method, which measures each glacier twice a year and uses automated software to track changes, seems to cover a lot more territory. [GIS and Science]
Whenever a cataclysmic weather event occurs—like Hurricane Harvey right now—there’s usually a heated political argument over whether or not it can be blamed on climate change. It turns out that there’s a field of research dedicated to assessing whether extreme weather can be attributed to climate change: it’s called extreme event attribution. There have been more than 140 peer-reviewed attribution studies of extreme weather events around the globe, which Carbon Brief has mapped here.
Carbon Brief’s analysis suggests 63% of all extreme weather events studied to date were made more likely or more severe by human-caused climate change. Heatwaves account for nearly half of such events (46%), droughts make up 21% and heavy rainfall or floods account for 14%.
NPR last month, reporting on a problem with FEMA’s flood insurance maps: they’re not keeping up with reality. “FEMA’s insurance maps are based on past patterns of flooding. Future sea level rise—which is expected to create new, bigger flood zones—is not factored in. So some communities are doing the mapping themselves. Like Annapolis, the state capital of Maryland.” [Leventhal]
This animated map from NASA (Flash-only, sorry) illustrates global temperatures since 1880: “reds indicate temperatures higher than the average during a baseline period of 1951-1980, while blues indicate lower temperatures than the baseline average.” News flash: the planet’s getting warmer. More information here.
Previously: Global Temperature Changes by Decade.