Group items matching

in title, tags, annotations or url

The Fish That Hunts with Flashlights Embedded in Its Face.

Climate change: Model predicts Australia to lose famous sites in new sea-level rise.

Oceanic dissolved oxygen (DO) decline in the Indian Ocean has profound implications for Earth's climate and human habitation in Eurasia and Africa. Owing to sparse observations, there is little research on DO variations, regional comparisons, and its relationship with marine environmental changes in the entire Indian Ocean. In this study, we applied different machine learning algorithms to fit regression models between measured DO, ocean reanalysis physical variables, and spatiotemporal variables. We utilized the Extremely Randomized Trees (ERT) model with the best performance, inputting complete reanalysis data and spatiotemporal information to reconstruct a four-dimensional DO dataset of the Indian Ocean during 1980-2019. The evaluation results showed that the ERT-based DO dataset was superior to the DO simulations in Earth System Models across different time and space. Furthermore, we assessed the spatiotemporal variations in reconstructed DO dataset. DO decline and oxygen-minimum zone (OMZ) expansion were prominent in the Arabian Sea, Bay of Bengal, and Equatorial Indian Ocean. Through correlation analysis, we found that temperature and salinity changes related to solubility primarily control the oxygen decrease in the middle and deep sea. However, the complicated factors with solubility change, vertical mixing, and circulation govern the oxygen increase in the upper and middle sea. Finally, we conducted a volume integral to estimate the oxygen content in the Indian Ocean. Overall, a deoxygenation trend of −141.5 ± 15.1 Tmol dec−1 was estimated over four decades, with a slowdown trend of −68.9 ± 31.3 Tmol dec−1 after 2000. Under global warming and climate change, OMZ expanding and deoxygenation in the Indian Ocean are gradually mitigating. This study enhances our understanding of DO dynamics of the Indian Ocean in response to deoxygenation.

Persistent light winds in the middle of the Pacific, nearly half way between New Zealand and Cape Horn means the chasing pack, led by rookie Paul MEILHAT (SMA), are slashing their distance to the two Vendée Globe leaders Alex THOMSON (Hugo BOSS) and Armel LE CLEAC'H (Banque Populaire VIII).

The mysteriously rich diversity of life on the isle of Madagascar might have arrived there in part on 'floating islands' carried by ocean currents, researchers now say.

Researchers have identified a new species of mysterious beaked whale based on a study of seven animals stranded on remote tropical islands in the Indian and Pacific Oceans over the past 50 years.

Researchers, including two Oregon State University scientists, argue in a new study that a paradigm shift is needed for assessing bridges' tsunami risk.

Key areas of the Indian Ocean, Bay of Bengal and the Pacific should be designated protected areas in order to safeguard vulnerable coastal communities' livelihoods, new research published this week reveals.

CSIRO's research vessel (RV) Investigator departed Darwin for a 45-day voyage of biodiversity discovery in the tropical waters of the Indian Ocean.

Our oceans and the complex "conveyer belt" system of currents that connects them play an important role in regulating global climate. The oceans store heat from the Sun, and ocean currents transport that heat from the tropics to the poles. They release the heat and moisture into the air, which moderates climate nearby. But what happens if part of that conveyer belt jams?

Scientists have identified a new mechanism to account for the drastic aridification in eastern Africa over the past two million years, with likely implications for understanding the evolution and dispersal of our early human ancestors.

Rising sea levels, coupled with the natural variability of atoll islands and coral reefs, is creating new uncertainty in international law, with geopolitical implications.