CO2 levels in the atmosphere are likely higher today than ever before in the past 3 million years. During this time, global mean temperatures never exceeded the preindustrial levels by more than 2°C. The study is based on breakthrough computer simulations of ice age onset in Earth's past climate.
Glaciers extending into freshwater lakes can form long, submerged terraces that menacingly rise above the surface when icy chunks fall into the water.
Increasing ground temperatures in the Arctic are indicators of global climate change, but until recently, areas of cold permafrost were thought to be relatively immune to severe impacts. A new study by Antoni Lewkowicz, a professor in the Department of Geography, Environment and Geomatics at the University of Ottawa and published in the journal Nature Communications, however, shows that areas of cold permafrost can be vulnerable to rising summer temperatures.
Visible imagery from NASA's Terra satellite revealed that strong wind shear was adversely affecting Subtropical Cyclone Joaninha in the Southern Indian Ocean.
Using data from about a hundred sites worldwide, an international research team has demonstrated that forest cover acts as a global thermal insulator, by cooling the understory when the air temperature is high. This buffer effect is well known, but this study is the first that has evaluated this worldwide in temperate, boreal and tropical forests.
Pores in atmospheric particles allow water to condense, leading to the formation of ice crystals in humid but unsaturated air. This is a new way of thinking of ice crystal formation in clouds, particularly cirrus clouds.
An unprecedented marine heatwave had long-lasting negative impacts on both survival and birth rates on the iconic dolphin population in Shark Bay, Western Australia. Researchers at UZH have now documented that climate change may have more far-reaching consequences for the conservation of marine mammals than previously thought.
One day makes a big difference when you're a tropical cyclone. On March 28, Tropical Cyclone Joaninha still maintained an eye, and on March 29, once outside winds ramped up, the storm weakened quickly. NOAA's NOAA-20 satellite provided an image of the storm that showed a large area of thunderstorms were pushed away from the center.
An international team of researchers has found robust evidence for signatures of the 11-year sunspot cycle in the tropical Pacific. They analyzed historical time series of pressure, surface winds, and precipitation with focus on the Walker Circulation -- a vast system of atmospheric flow in the tropical Pacific region that affects patterns of tropical rainfall. They have revealed that during periods of increased solar irradiance, the trade winds weaken and the Walker circulation shifts eastwards.
Tropical Cyclone Joaninha is not yet ready to close its eye and weaken. Visible imagery from NASA's Terra satellite showed Tropical Cyclone Joaninha maintaining an eye thanks to low wind shear and warm sea surface temperatures.