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Merge pull request #931 from ubilabs/auto/content-for-story-30
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chore(stories): update story: story-30
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KatvonRivia authored Jun 17, 2021
2 parents 489d51b + 6c61282 commit c502121
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},
{
"type": "video",
"text": "## Melting Ice\r\n\r\nGlobal warming is causing polar ice sheets and glaciers to melt, adding more water to the oceans. Warming water also expands, causing the height of the sea’s surface to rise. Mean sea level rose by about 15 centimetres during the last century and is currently rising more than twice as fast – at 3.6 cm per decade – the highest for 3,000 years. The rate is increasing and mean sea level is expected to rise 30–110 cm by 2100 – sufficient to overwhelm large parts of low-lying countries such as Kiribati.\r\n\r\nDuring storms and spring tides, parts of the islands are already regularly inundated and people are used to living with wet feet from time to time. The combination of high tides, sea level rise, storm surges and waves also leads to severe coastal erosion. This puts the squeeze on the islands’ already tight living space. Some uninhabited islands have already been lost, and several villages have been moved inland.\r\n\r\n## Coral Crisis\r\n\r\nBut that’s not the only worry for the people of Kiribati: rising levels of atmospheric carbon dioxide are leading to ocean acidification, which, along with pollution, poses a threat to the coral reef and fishing stocks. As the sea level rises, salt water contaminates fresh water aquifers and damages crops, putting great pressure on the available food and water supplies.\r\n\r\nCoastal erosion is mitigated in the short term by sea walls made from sand bags, car tyres and oil drums, and mangrove forest restoration bolsters the natural coastal defences. In the longer term, it might be possible to raise the height of the land surface with sand dredged from the lagoons. However, it is unclear whether the living coral that underpins the atolls can grow quickly enough to keep up with the rising sea level. The reefs are currently far from healthy, and growth rates are already declining due to stresses from raised water temperatures, ocean acidification, coral bleaching and pollution.",
"text": "## Melting Ice\r\n\r\nGlobal warming is causing [polar ice sheets and glaciers](stories/story-21/6) to melt, adding more water to the oceans. [Warming water](stories/story-16/7) also expands, causing the height of the sea’s surface to rise. Mean sea level rose by about 15 centimetres during the last century and is currently rising more than twice as fast – at 3.6 cm per decade – the highest for 3,000 years. The rate is increasing and mean sea level is expected to rise 30–110 cm by 2100 – sufficient to overwhelm large parts of low-lying countries such as Kiribati.\r\n\r\nDuring storms and spring tides, parts of the islands are already regularly inundated and people are used to living with wet feet from time to time. The combination of high tides, sea level rise, storm surges and waves also leads to severe coastal erosion. This puts the squeeze on the islands’ already tight living space. Some uninhabited islands have already been lost, and several villages have been moved inland.\r\n\r\n## Coral Crisis\r\n\r\nBut that’s not the only worry for the people of Kiribati: rising levels of atmospheric carbon dioxide are leading to ocean acidification, which, along with pollution, poses a threat to the coral reef and fishing stocks. As the sea level rises, salt water contaminates fresh water aquifers and damages crops, putting great pressure on the available food and water supplies.\r\n\r\nCoastal erosion is mitigated in the short term by sea walls made from sand bags, car tyres and oil drums, and mangrove forest restoration bolsters the natural coastal defences. In the longer term, it might be possible to raise the height of the land surface with sand dredged from the lagoons. However, it is unclear whether the living coral that underpins the atolls can grow quickly enough to keep up with the rising sea level. The reefs are currently far from healthy, and growth rates are already declining due to stresses from raised water temperatures, ocean acidification, coral bleaching and pollution.",
"shortText": "# Melting Ice\r\n\r\nCauses of rising sea level:\r\n\r\n- Ice sheets, glaciers melting, thermal expansion of the oceans\r\n- 15 cm sea level rise last century\r\n- now rising twice as fast → 3.6 cm per decade\r\n- fastest for 3,000 years → 30-110cm higher by 2100\r\n- amplified during storms and high tides\r\n- salt water contamination of fresh water aquifers\r\n\r\nSea defences in Kiribati:\r\n\r\n- short term – sandbags, oil drums\r\n- longer term – move villages inland, plant mangroves\r\n- land reclamation using sand dredged from lagoon?\r\n\r\nCoral reefs and fish stocks also threatened by higher water temperature, coral bleaching, ocean acidification.",
"imageFits": [
"contain",
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},
{
"type": "globe",
"text": "## Highs and Lows\r\n\r\nEarth observation satellites can use radar to accurately measure the height of the sea surface, allowing us to investigate how it varies through time and across the globe. In some areas, sea level rise can be five times that of the global average. This is mostly because variations in the amount of heat stored lead to uneven thermal expansion. This and other factors tend to amplify the sea level rise in tropical regions such as the central Pacific. Differences in salinity and local gravity also play a part.\r\n\r\nAbsolute measurements of sea level show the trend over years and decades. Changes from month to month show up more clearly if we work out sea level anomalies by calculating the difference between the level each month and a reference level. On the interactive globe this baseline is the average sea surface height at each point over the period 1993 to 2009. Run through the timeline to see where the sea is unusually high or low compared with mean sea level for a particular month. \r\n\r\nThe most extreme sea level variations are usually around strong ocean currents, such as the Gulf Stream in the North Atlantic and the Kuroshio Current in the North Pacific, where the motion of the current on the rotating Earth causes a slope in the sea surface. These currents are also clearly visible in the sea surface temperature data, shown on the other globe.\r\n\r\nThere is a seasonal cycle due to thermal expansion: sea levels are higher in the summer when the sea surface temperature increases. Sea level is, therefore, a good way of tracking the movement of heat around the oceans as well as the movement of water itself. Unlike measurements of the temperature of the sea surface, measurements of sea level are sensitive to changes integrated over the ocean’s depth.\r\n\r\nThe globes also show variation between years, such as changes caused by the warming of the Pacific Ocean surface during El Niño events. Check out the El Niño years of 1997, 2003, 2010 and 2015 to see how much the sea level rises around Kiribati in the central Pacific.",
"text": "## Highs and Lows\r\n\r\nEarth observation satellites can use radar to accurately measure the height of the sea surface, allowing us to investigate how it varies through time and across the globe. In some areas, sea level rise can be five times that of the global average. This is mostly because variations in the amount of heat stored lead to uneven thermal expansion. This and other factors tend to amplify the sea level rise in tropical regions such as the central Pacific. Differences in salinity and local gravity also play a part.\r\n\r\nAbsolute measurements of sea level show the trend over years and decades. Changes from month to month show up more clearly if we work out sea level anomalies by calculating the difference between the level each month and a reference level. On the interactive globe this baseline is the average sea surface height at each point over the period 1993 to 2009. Run through the timeline to see where the sea is unusually high or low compared with mean sea level for a particular month. \r\n\r\nThe most extreme sea level variations are usually around strong ocean currents, such as the Gulf Stream in the North Atlantic and the Kuroshio Current in the North Pacific, where the motion of the current on the rotating Earth causes a slope in the sea surface. These currents are also clearly visible in the sea surface temperature data, shown on the other globe.\r\n\r\nThere is a seasonal cycle due to thermal expansion: sea levels are higher in the summer when the sea surface temperature increases. Sea level is, therefore, a good way of tracking the [movement of heat around the oceans](stories/story-16/0) as well as the movement of water itself. Unlike measurements of the temperature of the sea surface, measurements of sea level are sensitive to changes integrated over the ocean’s depth.\r\n\r\nThe globes also show variation between years, such as changes caused by the warming of the Pacific Ocean surface during [El Niño events](stories/story-16/6). Check out the El Niño years of 1997, 2003, 2010 and 2015 to see how much the sea level rises around Kiribati in the central Pacific.",
"shortText": "# Highs and Lows\r\n\r\nSatellites use radar to accurately map sea surface height:\r\n\r\n- in some areas, sea level rise 5x global average \r\n- mostly due to uneven thermal expansion \r\n- also differences in salinity and local gravity \r\n- amplified in tropical regions such as central Pacific \r\n\r\nSea level anomaly shows where level is unusually high or low compared with long-term mean sea level for a particular month:\r\n\r\n- most extreme variations around strong ocean currents, eg Gulf Stream, Kuroshio Current \r\n- seasonal cycle due to thermal expansion – sea level higher in summer\r\n- year-to-year climate cycles, eg El Niño (1997, 2003, 2010, 2015)",
"imageFits": [
"contain",
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"imageCaptions": [
"High tide on Marakei Island, Kiribati (Diederik Veerman/Museon The Hague)",
"The Mississippi Delta is losing land the size of a football field every hour to the sea. Proba-V satellite image from 10 February 2015. \r\n(ESA-BELSPO, produced by VITO)",
"Copernicus Sentinel-2 Image of the 9km-long Eastern Scheldt Storm Surge Barrier (Oosterscheldekering) in the Netherlands. \r\nCoastal defences like this will be severely challenged in a future world with higher sea level.\r\n(Modified Copernicus Sentinel data (2020), processed by ESA)",
"Since the early 1990s, satellite altimeters have revolutionised our understanding of sea-level rise. Global mean sea level has not only risen over the last 25 years – by about 3 cm per decade – but the rate at which it is rising is accelerating. ESA’s ERS and Envisat satellites carried radar altimeters, as do CryoSat and Copernicus Sentinel-3. Copernicus Sentinel-6 provides continuity with the US-French Jason and Topex-Poseidon satellites. (ESA)",
"A map of regional sea level trends, derived from more than 20 years of satellite observations, shows where mean sea level is rising the most (red), dropping (blue), or remains unchanged (grey) (ESA-CCI)"
"Copernicus Sentinel-2 Image of the 9km-long Eastern Scheldt Storm Surge Barrier (Oosterscheldekering) in the Netherlands. Coastal defences like this will be severely challenged in a future world with higher sea level. (Modified Copernicus Sentinel data (2020), processed by ESA)",
"# Sea Level Rise Measured by Satellites\r\n\r\nSince the early 1990s, satellite altimeters have revolutionised our understanding of sea-level rise. Global mean sea level has not only risen over the last 25 years – by about 3 cm per decade – but the rate at which it is rising is accelerating. ESA’s ERS and Envisat satellites carried radar altimeters, as do CryoSat and Copernicus Sentinel-3. Copernicus Sentinel-6 provides continuity with the US-French Jason and Topex-Poseidon satellites. (ESA)",
"# Regional Sea Level Trend 1993-2015\r\n\r\nA map of regional sea level trends, derived from more than 20 years of satellite observations, shows where mean sea level is rising the most (red), dropping (blue), or remains unchanged (grey) (ESA-CCI)"
],
"imageFits": [
"cover",
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},
{
"type": "video",
"text": "## The Sea Level Budget\r\n\r\nTo accurately measure sea level rise, attribute its causes and analyse the potential impacts, we need consistent data from observations across the globe. Identifying the individual contributors to sea level rise involves tracking water as it moves around the world in all its states – solid, liquid and gas – and this makes it one of the most complicated challenges in climate science. ESA’s Climate Change Initiative has examined records of satellite data collected since the 1990s covering sea level, the temperature of the sea surface and the thickness of the polar ice sheets, and information about the world’s glaciers going back to the 1960s. \r\n\r\nIt is estimated that in the decade 2003–2013, 36% of sea level rise was meltwater from the Greenland and Antarctic ice sheets; 30% was due to thermal expansion; 20% from melting glaciers; and 10% was due to groundwater extracted from aquifers for domestic, industrial and agricultural use that is ultimately discharged to the oceans. Although the contributions are all following an upward trend, they vary through time and don’t always add up to the observed total sea level rise. Bridging this gap in our knowledge is known as closing the sea level budget, and is an important focus for climate scientists. \r\n\r\nThe integration of new data from ESA satellites such as CryoSat and Copernicus Sentinels-3 and -6 will improve our knowledge of this key climate variable. Consistent and continuous information from multiple sources will help us better understand sea level change and its impacts, and evaluate the adaptation options for the world’s coastal populations, including the inhabitants of Kiribati.",
"text": "## The Sea Level Budget\r\n\r\nTo accurately measure sea level rise, attribute its causes and analyse the potential impacts, we need consistent data from observations across the globe. Identifying the individual contributors to sea level rise involves tracking water as it moves around the world in all its states – solid, liquid and gas – and this makes it one of the most complicated challenges in climate science. ESA’s [Climate Change Initiative](stories/story-32/3) has examined records of satellite data collected since the 1990s covering sea level, the temperature of the sea surface and the thickness of the polar ice sheets, and information about the world’s glaciers going back to the 1960s. \r\n\r\nIt is estimated that in the decade 2003–2013, 36% of sea level rise was meltwater from the [Greenland and Antarctic ice sheets](stories/story-15/5); 30% was due to [thermal expansion](stories/story-16/0); 20% from [melting glaciers](stories/story-21/6); and 10% was due to [groundwater extracted from aquifers](stories/story-21/5) for domestic, industrial and agricultural use that is ultimately discharged to the oceans. Although the contributions are all following an upward trend, they vary through time and don’t always add up to the observed total sea level rise. Bridging this gap in our knowledge is known as closing the sea level budget, and is an important focus for climate scientists. \r\n\r\nThe integration of new data from ESA satellites such as CryoSat and Copernicus Sentinels-3 and -6 will improve our knowledge of this key climate variable. Consistent and continuous information from multiple sources will help us better understand sea level change and its impacts, and evaluate the adaptation options for the world’s coastal populations, including the inhabitants of Kiribati.",
"shortText": "# The Sea Level Budget\r\n\r\nESA’s Climate Change Initiative uses satellite data to investigate individual contributors to sea level rise:\r\n\r\n- sea level and ice sheet thickness since 1990s\r\n- ocean temperature since 1980s\r\n- glacier information since 1960s\r\n\r\nIn the decade 2003–2013 sea level rise was:\r\n\r\n- 36% due to meltwater from Greenland and Antarctic ice sheets\r\n- 30% due to thermal expansion\r\n- 20% due to melting glaciers\r\n- 10% due to groundwater extraction\r\n\r\nContinuous information from satellite and other sources will help us better understand sea level change, and evaluate the adaptation options for Kiribati’s inhabitants and the world’s other coastal populations.",
"imageFits": [
"contain",
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