How ocean warmth triggers glacial melting far away
"The melting of glaciers on one side of the globe can trigger disintegration of glaciers on the other side of the globe, as has been presented in a recent paper by a team of AWI scientists, who investigated marine microalgae preserved in glacial deposits and subsequently used their findings to perform climate simulations. The study highlights a process with alerting consequences for modern ice sheets: continuous warming of the ocean can result in a massive loss of polar ice mass, and consequently to rapid sea level rise."
Source: Science Daily
North Pacific freshwater events linked to changes in glacial ocean circulation
"There is compelling evidence that episodic deposition of large volumes of freshwater into the oceans strongly influenced global ocean circulation and climate variability during glacial periods. In the North Atlantic region, episodes of massive freshwater discharge to the North Atlantic Ocean were related to distinct cold periods known as Heinrich Stadials. [...]"
Authors: E. Maier et al.
Changing storminess and global capture fisheries
"Climate change-driven alterations in storminess pose a significant threat to global capture fisheries. Understanding how storms interact with fishery social-ecological systems can inform adaptive action and help to reduce the vulnerability of those dependent on fisheries for life and livelihood."
Source: Nature Climate Change
Authors: Nigel C. Sainsbury et al.
Hazards of decreasing marine oxygen: the near-term and millennial-scale benefits of meeting the Paris climate targets
"Ocean deoxygenation is recognized as key ecosystem stressor of the future ocean and associated climate-related ocean risks are relevant for current policy decisions. In particular, benefits of reaching the ambitious 1.5 °C warming target mentioned by the Paris Agreement compared to higher temperature targets are of high interest. Here, we model oceanic oxygen, warming and their compound hazard in terms of metabolic conditions on multi-millennial timescales for a range of equilibrium temperature targets. [...]"
Source: Earth System Dynamics
Authors: Gianna Battaglia and Fortunat Joos
Drivers and mechanisms of ocean deoxygenation
"Direct observations indicate that the global ocean oxygen inventory is decreasing. Climate models consistently confirm this decline and predict continuing and accelerating ocean deoxygenation. However, current models (1) do not reproduce observed patterns for oxygen changes in the ocean’s thermocline; (2) underestimate the temporal variability of oxygen concentrations and air–sea fluxes inferred from time-series observations; and (3) generally simulate only about half the oceanic oxygen loss inferred from observations. [...]"
Source: Nature Geoscience
Authors: Andreas Oschlies et al.
Reversal of Increasing Tropical Ocean Hypoxia Trends With Sustained Climate Warming
"Dissolved oxygen (O2) is essential for the survival of marine animals. Climate change impacts on future oxygen distributions could modify species biogeography, trophic interactions, biodiversity, and biogeochemistry. The Coupled Model Intercomparison Project Phase 5 models predict a decreasing trend in marine O2 over the 21st century. [...]"
Source: Global Biogeochemical Cycles
Authors: Weiwei Fu et al.
Global Insurance Industry Steps Up to Turn Ocean Risk Into Resilience
At the Ocean Risk Summit in Bermuda, experts gathered to advance a new model for how insurance and reinsurance companies can leverage their products and balance sheets to restore marine ecosystems and slow climate change impacts.
"When Hurricane Irma smashed into the British Virgin Islands last September at speeds faster than a jumbo jet at takeoff, the devastation was total. The storm caused damage valued at three times more than the Caribbean islands’ entire gross domestic product, while the territory’s economy – including its biggest industry, tourism – shut down for months. [...]"
Source: Oceans Deeply
The Baltic Sea as a time machine for the future coastal ocean
"Coastal global oceans are expected to undergo drastic changes driven by climate change and increasing anthropogenic pressures in coming decades. Predicting specific future conditions and assessing the best management strategies to maintain ecosystem integrity and sustainable resource use are difficult, because of multiple interacting pressures, uncertain projections, and a lack of test cases for management. [...]"
Source: Science Advances
Authors: Thorsten B. H. Reusch et al.
A Sixteen-year Decline in Dissolved Oxygen in the Central California Current
"A potential consequence of climate change is global decrease in dissolved oxygen at depth in the oceans due to changes in the balance of ventilation, mixing, respiration, and photosynthesis. We present hydrographic cruise observations of declining dissolved oxygen collected along CalCOFI Line 66.7 (Line 67) off of Monterey Bay, in the Central California Current region, and investigate likely mechanisms. [...]"
Source: Scientific Reports
Authors: Alice S. Ren et al.
Ocean euxinia and climate change "double whammy" drove the Late Ordovician mass extinction
"The Late Ordovician mass extinction (LOME, ca. 445 Ma) was the first of the "Big Five" Phanerozoic extinction events and comprised two extinction pulses. Proposed kill mechanisms include glacially induced global cooling and the expansion of water-column anoxia and/or euxinia (sulfidic conditions), but no general consensus has been reached with regard to the precise role of these mechanisms. [...]"
Authors: Caineng Zou et al.