Sustained climate warming drives declining marine biological productivity

In the Southern Ocean, nutrient-rich North Atlantic Deep Water upwells to the surface, and the northward surface water sinks at mid-depth (as Subantarctic Mode Water and Antarctic Intermediate Water) and transports nutrients into the low-latitude thermocline. According to a recent article appeared in Science, climate model simulations under RCP 8.5 scenario project that the Antarctic... Continue Reading →

Antarctic volcanic eruption linked to the onset of the most rapid global climate change during the end of the last ice age

Cold and dry glacial-state climate conditions persisted in the Southern Hemisphere until approximately 17.7 ka, when paleoclimate records show a largely unexplained sharp, nearly synchronous acceleration in deglaciation. Detailed measurements in Antarctic ice cores document exactly at that time a unique, ∼192-y series of massive halogen-rich volcanic eruptions geochemically attributed to Mount Takahe in West... Continue Reading →

Evidence of a plume on Europa from Galileo magnetic and plasma wave signatures

The icy surface of Jupiter’s moon, Europa, is thought to lie on top of a global ocean. Signatures in some Hubble Space Telescope images have been associated with putative water plumes rising above Europa’s surface, providing support for the ocean theory. However, all telescopic detections reported were made at the limit of sensitivity of the... Continue Reading →

Hurricane Harvey links to ocean heat content and climate change adaptation

While hurricanes occur naturally, human‐caused climate change is supercharging them and exacerbating the risk of major damage. Here, using ocean and atmosphere observations, we demonstrate links between increased upper ocean heat content due to global warming with the extreme rainfalls from recent hurricanes. Hurricane Harvey provides an excellent case study as it was isolated in... Continue Reading →

Meridional overturning circulation conveys fast acidification to the deep Atlantic Ocean posing a severe threat to cold-water coral habitats.

Increasing atmospheric carbon dioxide concentrations are increasing the acidity of the oceans and reducing carbonate-ion concentrations, making it difficult for corals to maintain their calcium carbonate skeletons. This paper reports a roughly 40 per cent reduction in the transport of carbonate ions to the deep North Atlantic ocean since preindustrial times, with implications for cold-water... Continue Reading →

Ocean dynamics plays a key role in driving the Atlantic Multidecadal Oscillation (AMO)

The recently proposed atmosphere-forced thermodynamics mechanism of the AMO challenged the well-known ocean dynamics mechanism, and thus it is important to identify a key feature associated with the AMO that can be used to distinguish between the two mechanisms. In this study, the spatial structure of AMO is analyzed and compared between the observations and... Continue Reading →

Northward shift of the East Asian summer monsoon enhances US summer rainfall variability

The strength of the dominant variability of contiguous United States (CONUS) summer rainfall during 1960–2013 experiences an interdecadal change in the early 1990s. Before the early 1990s, the variation in CONUS summer rainfall is relatively small in amplitude (standard deviation: 0.64  mm per day), whereas after it amplifies remarkably, with its standard deviation (1.31  mm... Continue Reading →

The boundary that separates the humid East US from the semi-arid West is shifting eastward

The 100th meridian bisects the Great Plains of the United States and effectively divides the continent into more arid western and less arid eastern halves and is well expressed in terms of vegetation, land hydrology, crops, and the farm economy. Here, it is considered how this arid–humid divide will change in intensity and location during... Continue Reading →

Net retreat of Antarctic glacier grounding lines

Grounding lines are a key indicator of ice-sheet instability, because changes in their position reflect imbalance with the surrounding ocean and affect the flow of inland ice. Although the grounding lines of several Antarctic glaciers have retreated rapidly due to ocean-driven melting, records are too scarce to assess the scale of the imbalance. Here, we... Continue Reading →

Powered by

Up ↑