Global sea surface temperature is approximately 1 degree C higher now than 140 years ago, and is one of the primary physical impacts of climate change. Sea surface temperature in European seas is increasing more rapidly than in the global oceans. Projections show the temperature increases will persist throughout this century. Ice-free summers are expected in the Arctic by the end of this century, if not earlier. Already, there is evidence that many marine ecosystems in European seas are affected by rising sea temperature.
Over the past 25 years the rate of increase in sea surface temperature in all European seas has been about 10 times faster than the average rate of increase during the past century. In five European seas the warming occurs even more rapidly. In the North and Baltic Seas temperature rose five to six times faster than the global average over the past 25 years, and three times faster in the Black and Mediterranean Seas.
The IPCC also suggests ocean warming will be relatively large in the Arctic and along the equator in the eastern Pacific and that the North Atlantic and the Southern Ocean will warm to a lesser extent. Currently it is not possible to project changes in sea surface temperatures for the different geographic regions across Europe because the spatial resolution of the ocean-climate models is not high enough.
Towards ice-free Arctic summers
Sea surface temperature plays an important role in the oceans heat content, and regulates climate. This is illustrated in the Atlantic Ocean currents which play a key role in regulating the climate in Europe. Heat is transported northward with the Gulf Stream and influences precipitation and wind regimes. Heat also transfers from the atmosphere into the ocean, causing temperature to increase both at the sea surface and in deeper waters.
One of the most visible ramifications of increased temperature of the ocean is the reduced area of sea ice coverage in the Arctic polar region. If this continues, a feedback mechanism is expected, i.e. the reduced polar ice coverage will speed up global warming, which will further affect ocean circulation and weather patterns.
Although there is an element of uncertainty, projections show that summer ice is very likely to continue to shrink in extent and thickness, leaving larger areas of open water for an extended period. In winter, however, it is very likely that sea ice will continue to cover large areas.
Until recently several international assessments concluded that mostly ice-free late-summers could occur by the end of this century. However, the actual melting has been faster than the average trends simulated by the climate models used for these assessments. New model studies suggest that ice-free summers may occur much sooner. Exactly when is impossible to predict with confidence, due both to the limited understanding of the processes involved and the large variability of the system.
Impacts on marine ecosystems
There is an increasing body of evidence suggesting that many marine ecosystems in European seas are affected by rising sea temperature and the warming of the air. Some organisms are now appearing earlier in their seasonal cycles than in the past.
In the North Sea, for example, the seasonal peak of abundance of decapod larvae, an organism at the bottom of the marine food web, is now four to six weeks earlier than in 1958. This can seriously impact the ability of higher organisms, such as fish and sea birds to survive in certain areas.
Changes in the timing of seasonal cycles have important consequences for the way organisms within an ecosystem interact. Ultimately, this also has affects the structure of the marine food-webs at all levels in the food chain.
The consequences include:
- increased vulnerability of North Sea cod and stocks to over-fishing;
- decline in seabird populations
Fish and plankton have expanded their geographical distribution further north in response to increasing temperatures. Depending on the species this expansion occurs at an average rate of 30 -100 km per year.why, as a helper, should you be concerned with multiculturalism? What time does the beauty supply close? how much sour cream add to hamburger helper stroganoff What does lgtm mean? How to pronounce poignant? What does tyranny mean? How to cook steak tips cast iron? What does dearth mean? What is the true meaning of friendship? What is the meaning of elizabeth in the bible? what is malwarebytes helper tool How to add card to cash app? What is the britist show new tricks about? What does it mean to be a good citizen? What do the red flags mean on twitter? Tips on how to cook duck? How many people have died attempting houdini's tricks? How to make a pop up card? What does it mean when your engine light is blinking? How to paint brick fireplace? What happened to juan from trainer tips? 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