An illustrated visit to the tropical arctic of 205 million years ago when Greenland was green. While today’s Greenland is largely covered in ice, in the time of the dinosaurs the area was a lushly forested, tropical zone. Tropical Arctic tracks a ten-million-year window of Earth’s history when global temperatures soared and the vegetation of the world responded. A project over eighteen years in the making, Tropical Arctic is the result of a unique collaboration between two paleobotanists, Jennifer C. McElwain and Ian J. Glasspool, and award-winning scientific illustrator Marlene Hill Donnelly. They began with a simple question: “What was the color of a fossilized leaf?” Tropical Arctic answers that question and more, allowing readers to experience Triassic Greenland through three reconstructed landscapes and an expertly researched catalog of extinct plants. A stunning compilation of paint and pencil art, photos, maps, and engineered fossil models, Tropical Arctic blends art and science to bring a lost world to life. Readers will also enjoy a front-row seat to the scientific adventures of life in the field, with engaging anecdotes about analyzing fossils and learning to ward off polar bear attacks. Tropical Arctic explains our planet’s story of environmental upheaval, mass extinction, and resilience. By looking at Earth’s past, we see a glimpse of the future of our warming planet—and learn an important lesson for our time of climate change.

A combination of the author's Polar World (1869) and his Tropical World. The first part includes new information on the acquisition of Alaska and on C.F. Hall's expedition, 1860-62. (AB 6732).

The Arctic has been undergoing significant changes in recent years. Average temperatures are rising twice as fast as they are elsewhere in the world. The extent and thickness of sea ice is rapidly declining. Such changes may have an impact on atmospheric conditions outside the region. Several hypotheses for how Arctic warming may be influencing mid-latitude weather patterns have been proposed recently. For example, Arctic warming could lead to a weakened jet stream resulting in more persistent weather patterns in the mid-latitudes. Or Arctic sea ice loss could lead to an increase of snow on high-latitude land, which in turn impacts the jet stream resulting in cold Eurasian and North American winters. These and other potential connections between a warming Arctic and mid-latitude weather are the subject of active research. Linkages Between Arctic Warming and Mid-Latitude Weather Patterns is the summary of a workshop convened in September 2013 by the National Research Council to review our current understanding and to discuss research needed to better understand proposed linkages. A diverse array of experts examined linkages between a warming Arctic and mid-latitude weather patterns. The workshop included presentations from leading researchers representing a range of views on this topic. The workshop was organized to allow participants to take a global perspective and consider the influence of the Arctic in the context of forcing from other components of the climate system, such as changes in the tropics, ocean circulation, and mid-latitude sea surface temperature. This report discusses our current understanding of the mechanisms that link declines in Arctic sea ice cover, loss of high-latitude snow cover, changes in Arctic-region energy fluxes, atmospheric circulation patterns, and the occurrence of extreme weather events; possible implications of more severe loss of summer Arctic sea ice upon weather patterns at lower latitudes; major gaps in our understanding, and observational and/or modeling efforts that are needed to fill those gaps; and current opportunities and limitations for using Arctic sea ice predictions to assess the risk of temperature/precipitation anomalies and extreme weather events over northern continents.