麻豆视频

Imagine not a white, but a green Arctic, with woody shrubs as far north as the Canadian coast of the Arctic Ocean. This is what the northernmost region of North America looked like about 125,000 years ago, during the last interglacial period, finds new research from CU Boulder led by Sarah Crump. Researchers analyzed plant DNA more than 100,000 years old retrieved from lake sediment in the Arctic and found evidence of a past ecosystem. As the Arctic warms much faster than everywhere else on the planet in response to climate change, the findings, published this week in the Proceedings of the National Academy of Sciences, may not only be a glimpse of the past but a snapshot of our potential future.

Rolf Kihl, a meticulous and inventive scientist who established INSTAAR鈥檚 Sedimentology Lab and ran it for decades, passed away on January 19, 2021. The INSTAAR community mourns his loss.

The Boulder Faculty Assembly has awarded INSTAAR Fellow Holly Barnard an Excellence Award for leadership and service.

Scientists call for joint efforts to combine real-time global rainfall data with high-resolution local hydrology to better forecast floods.

Food insecurity is a growing threat in many places around the world. This situation is exacerbated by two events that many geoscientists are tasked to study: natural hazards and our changing climate. The February issue of Eos, organized by Ben Zaitchik and Merritt Turetsky, looks at how geoscientists are using their research to help create resilient communities around the world that can always be sure of food in their pantries.

The year 2020, which witnessed terrifying blazes from California to Siberia and a record number of tropical cyclones in the Atlantic, rivaled and possibly even equaled the hottest year on record, according to multiple scientific announcements Thursday. Experts said that another year as hot as 2016 coming so soon suggests a swift step up the climate escalator. And it implies that a momentous new temperature record - breaching the critical 1.5 degrees Celsius (2.7 degrees Fahrenheit) warming threshold for the first time - could occur as soon as later this decade.

During the first half of 2020, global greenhouse gas emissions dropped by about nine percent in the midst of the COVID-19 outbreak. People around the world reported seeing signs that 鈥渘ature was healing鈥� as a result of a steep decline in human activities such as transportation and production. However, a new study from UC Boulder has shown that the positive changes seen in natural ecosystems were not reflected throughout Earth鈥檚 oceans.

Climate change - we all know that it's happening, but how do we actually know this scientifically? Bruce Vaughn studies glaciers up at the North Pole, looking at ice cores to study how our climate has changed over the Earth's history. We talk about how this is done, and also how we are now entering uncharted territory of atmospheric CO2, warming, and what we as a species can do about it.

These international waters, known as the high seas, harbor a plethora of natural resources and millions of unique marine species. But they are being damaged irretrievably. Research shows unsustainable fisheries are one of the greatest threats to marine biodiversity in the high seas.

The COVID-19 pandemic resulting shutdowns resulted in a 9% drop in the greenhouse gas emissions at the root of climate change. Unfortunately, any silver lining from the pandemic remains murky in the oceans. INSTAAR researchers Nicole Lovenduski delved into the data and found no detectable slowing of ocean acidification due to COVID-19 emissions reductions. Even at emissions reductions four times the rate of those in the first half of 2020, the change would be barely noticeable. Lovenduski shared the results Friday, Dec. 11 at the American Geophysical Union 2020 Fall Meeting. The findings will also be submitted to the journal Geophysical Research Letters.