#watertemperature — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #watertemperature, aggregated by home.social.
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How Do Thermocline Depth Maps Help To Locate Bluefin Tuna?
(the sustainable recreational bluefin tuna fishery in New Zealand is spinning up)
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https://www.fishingmaps.info/articles/bluefin-tuna-and-the-thermocline/ <-- shared technical article
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https://youtu.be/jit_BjecD1I?si=Ici-Ar3UWlCNyble <-- shared Marine Stewardship Council video, “How science guides sustainable tuna fishing…”
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https://www.nzgeo.com/stories/billion-dollar-fish/ <-- shared technical media article
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[this post should not be considered an endorsement of a particular product, approach, organisation or professional(s)]
H/T @ Sam McClatchie | Rewired ex-NOAA Fisheries Oceanographer. Creator of Fishing Maps. Now based in Huia, near Auckland, New Zealand.
“The vertical structure of the upper ocean has a big effect on the productivity and distribution of plankton near the surface of the ocean. The vertical structure also affects the concentration of feed, and that affects the behaviour of Bluefin. Vertical structure of the water is controlled by the interaction of heating by the sun, wind-driven mixing, and the density of the water. In offshore areas, or in areas away from river outflows, density is determined mainly by water temperature. The sun warms the surface of the ocean, and the wind blowing over the ocean distributes the heat by mixing the water.
As the sun warms the surface water it becomes less dense and forms a cap sitting on top of the cold deeper water. The temperature changes rapidly at the boundary between the warm less dense surface water and the denser, cooler water below. This boundary is called the thermocline. If you have ever swum in a lake in the summer and found it warm as bathwater in the surface, but freezing cold when you dropped your feet down, you have experienced the effect of a thermocline.
When there is a warm cap on the ocean, the water is said to be stratified (or layered). If the wind has been calm, and the weather sunny, the warm surface layer will be stable, and strongly stratified conditions may develop. In these conditions, Bluefin dive frequently to relatively shallow depths (less than 100 metres). They dive rapidly, feed below the thermocline and return to the surface waters frequently, spending as much as 65% of their time in the upper 10 metres…
Concentrations of feed often occur just below the thermocline. These layers can be seen on an echosounder. Bluefin dive down through the thermocline to feed on these layers. When the water is strongly stratified, the Bluefin dive more frequently to feed. They also dive faster, and stay less time in the deep cold water than they do when the water is well mixed.
Bluefin use this foraging strategy during both day and night. These fish maintain a body temperature warmer than the water, so they remain highly efficient swimmers in cold water..."
#GIS #spatial #mapping #webmaps #mobile #bluefin #tuna #sustainable #recreational #fishing #fishery #NewZealand #fish #thermocline #depth #remotesensing #food #plankton #warming #watertemperature #marine #ocean #hydrology #river #outflows #hydrography #water #stratification #surface #depth #feeding #ecosystem #habitat -
How Do Thermocline Depth Maps Help To Locate Bluefin Tuna?
(the sustainable recreational bluefin tuna fishery in New Zealand is spinning up)
--
https://www.fishingmaps.info/articles/bluefin-tuna-and-the-thermocline/ <-- shared technical article
--
https://youtu.be/jit_BjecD1I?si=Ici-Ar3UWlCNyble <-- shared Marine Stewardship Council video, “How science guides sustainable tuna fishing…”
--
https://www.nzgeo.com/stories/billion-dollar-fish/ <-- shared technical media article
--
[this post should not be considered an endorsement of a particular product, approach, organisation or professional(s)]
H/T @ Sam McClatchie | Rewired ex-NOAA Fisheries Oceanographer. Creator of Fishing Maps. Now based in Huia, near Auckland, New Zealand.
“The vertical structure of the upper ocean has a big effect on the productivity and distribution of plankton near the surface of the ocean. The vertical structure also affects the concentration of feed, and that affects the behaviour of Bluefin. Vertical structure of the water is controlled by the interaction of heating by the sun, wind-driven mixing, and the density of the water. In offshore areas, or in areas away from river outflows, density is determined mainly by water temperature. The sun warms the surface of the ocean, and the wind blowing over the ocean distributes the heat by mixing the water.
As the sun warms the surface water it becomes less dense and forms a cap sitting on top of the cold deeper water. The temperature changes rapidly at the boundary between the warm less dense surface water and the denser, cooler water below. This boundary is called the thermocline. If you have ever swum in a lake in the summer and found it warm as bathwater in the surface, but freezing cold when you dropped your feet down, you have experienced the effect of a thermocline.
When there is a warm cap on the ocean, the water is said to be stratified (or layered). If the wind has been calm, and the weather sunny, the warm surface layer will be stable, and strongly stratified conditions may develop. In these conditions, Bluefin dive frequently to relatively shallow depths (less than 100 metres). They dive rapidly, feed below the thermocline and return to the surface waters frequently, spending as much as 65% of their time in the upper 10 metres…
Concentrations of feed often occur just below the thermocline. These layers can be seen on an echosounder. Bluefin dive down through the thermocline to feed on these layers. When the water is strongly stratified, the Bluefin dive more frequently to feed. They also dive faster, and stay less time in the deep cold water than they do when the water is well mixed.
Bluefin use this foraging strategy during both day and night. These fish maintain a body temperature warmer than the water, so they remain highly efficient swimmers in cold water..."
#GIS #spatial #mapping #webmaps #mobile #bluefin #tuna #sustainable #recreational #fishing #fishery #NewZealand #fish #thermocline #depth #remotesensing #food #plankton #warming #watertemperature #marine #ocean #hydrology #river #outflows #hydrography #water #stratification #surface #depth #feeding #ecosystem #habitat -
Upwelling Failure [2025, Gulf of Panama]
For the first time since records began, the cold, nutrient-rich waters of the Gulf of Panama failed to emerge
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https://stri.si.edu/story/upwelling-failure <-- shared @Smithsonianmag technical article
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https://doi.org/10.1073/pnas.2512056122 <-- shared paper
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#GulfofPanama #GIS #spatial #mapping #remotesensing #nutrients #upwelling #seasonalupwelling #ecosystem #fisheries #productivity #economics #foodsecurity #humanimpacts #communities #earthobservation #marine #ocean #climatechange #tropical #climate #LaNiña #sampling #cooling #temperature #watertemperature #coral #ecology #coast #coastal #marineenvironment #oceangraphy #spatialanalysis #spatiotemporal #model #modeling #SmithsonianTropicalResearchInstitute #STRI #coralreefs #wind #windpatterns #tradewinds #atmosphere #oceanicprocesses #Panama
@Smithsonian Tropical Research Institute -
Upwelling Failure [2025, Gulf of Panama]
For the first time since records began, the cold, nutrient-rich waters of the Gulf of Panama failed to emerge
--
https://stri.si.edu/story/upwelling-failure <-- shared @Smithsonianmag technical article
--
https://doi.org/10.1073/pnas.2512056122 <-- shared paper
--
#GulfofPanama #GIS #spatial #mapping #remotesensing #nutrients #upwelling #seasonalupwelling #ecosystem #fisheries #productivity #economics #foodsecurity #humanimpacts #communities #earthobservation #marine #ocean #climatechange #tropical #climate #LaNiña #sampling #cooling #temperature #watertemperature #coral #ecology #coast #coastal #marineenvironment #oceangraphy #spatialanalysis #spatiotemporal #model #modeling #SmithsonianTropicalResearchInstitute #STRI #coralreefs #wind #windpatterns #tradewinds #atmosphere #oceanicprocesses #Panama
@Smithsonian Tropical Research Institute -
https://www.europesays.com/uk/241073/ The best temperature for drinking water, according to experts #cold #DigestiveSystem #Drink #Health #HealthBenefits #HotDrinks #hydrate #hydration #Ice #IceWater #JapaneseWaterTherapy #liquid #Nutrition #OverallPerformance #refresh #rehydrate #sip #thirst #UK #UnitedKingdom #Water #WaterTemperature
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'Anything that can be built can be taken down': The largest dam removal in US history is complete – what happens next?
The #KlamathRiver is free of four huge dams for the first time in generations. But for the #Yurok tribe, the river's restoration is only just beginning – starting with 18 billion seeds.
by Lucy Sheriff, September 3, 2024
"This is decades and decades in the making," says Thompson. 'We were told it was never going to happen. That it was foolish to even ask for one removal. We were asking for four.'
"The #KlamathBasin covers more than 12,000 square miles (31,000 sq km) in southern Oregon and northern California, and was home to the JC Boyle, Copco 1, Copco 2 and Iron Gate dams, all owned by #PacifiCorp, an electric utilities company. The Klamath was once the third-largest salmon producing river on the US's West Coast before the construction of the dams blocked fish from accessing almost 400 miles (640km) of critical river habitat for almost 100 years.
"Fall #ChinookSalmon numbers plummeted by more than 90% and spring chinook by 98%. #SteelheadTrout, #CohoSalmon and #PacificLamprey numbers also saw drastic declines, and the Klamath tribes in the upper basin have been without their salmon fishery for a century, since the completion of #Copco 1 in 1922. The situation became so bad that Yurok tribe – who are known as the salmon people – began importing Alaskan salmon for their annual salmon festival, traditionally held to celebrate the first return of fall chinook salmon to the Klamath River.
"The dams also had a severe impact on #WaterTemperature and quality – growth of #ToxicAlgae behind two of the dams resulted in health warnings against water contact.
"'It was painful,' says Willard Carlson, a Yurok elder who is known as a #RiverWarrior and was part of the inter-generational campaign. 'All those years seeing our river damaged like that. I remember as a kid we'd have other people from nearby tribes making fun of our river. 'Oh, you're Yurok, your river is dirty.' For us, the #dams were a monument to the [#coloniser] people who conquered us."
[...]
"Restoring the land
But something that does need "a helping hand is the restoration of 2,200 acres (890ha) of land that is above ground for the first time in a century following the emptying of four reservoirs.
"'Removing the dams is one thing, restoring the land is quite another,' says Thompson, a civil engineer and part of the crew working on the restoration project – which is being managed by Resource Environmental Solutions, an ecological restoration company."
#KarukTribe #YurokTribe #KlamathRiverRenewal #RestoreNature #Decolonize #WaterIsLife #NativeAmericans
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'Anything that can be built can be taken down': The largest dam removal in US history is complete – what happens next?
The #KlamathRiver is free of four huge dams for the first time in generations. But for the #Yurok tribe, the river's restoration is only just beginning – starting with 18 billion seeds.
by Lucy Sheriff, September 3, 2024
"This is decades and decades in the making," says Thompson. 'We were told it was never going to happen. That it was foolish to even ask for one removal. We were asking for four.'
"The #KlamathBasin covers more than 12,000 square miles (31,000 sq km) in southern Oregon and northern California, and was home to the JC Boyle, Copco 1, Copco 2 and Iron Gate dams, all owned by #PacifiCorp, an electric utilities company. The Klamath was once the third-largest salmon producing river on the US's West Coast before the construction of the dams blocked fish from accessing almost 400 miles (640km) of critical river habitat for almost 100 years.
"Fall #ChinookSalmon numbers plummeted by more than 90% and spring chinook by 98%. #SteelheadTrout, #CohoSalmon and #PacificLamprey numbers also saw drastic declines, and the Klamath tribes in the upper basin have been without their salmon fishery for a century, since the completion of #Copco 1 in 1922. The situation became so bad that Yurok tribe – who are known as the salmon people – began importing Alaskan salmon for their annual salmon festival, traditionally held to celebrate the first return of fall chinook salmon to the Klamath River.
"The dams also had a severe impact on #WaterTemperature and quality – growth of #ToxicAlgae behind two of the dams resulted in health warnings against water contact.
"'It was painful,' says Willard Carlson, a Yurok elder who is known as a #RiverWarrior and was part of the inter-generational campaign. 'All those years seeing our river damaged like that. I remember as a kid we'd have other people from nearby tribes making fun of our river. 'Oh, you're Yurok, your river is dirty.' For us, the #dams were a monument to the [#coloniser] people who conquered us."
[...]
"Restoring the land
But something that does need "a helping hand is the restoration of 2,200 acres (890ha) of land that is above ground for the first time in a century following the emptying of four reservoirs.
"'Removing the dams is one thing, restoring the land is quite another,' says Thompson, a civil engineer and part of the crew working on the restoration project – which is being managed by Resource Environmental Solutions, an ecological restoration company."
#KarukTribe #YurokTribe #KlamathRiverRenewal #RestoreNature #Decolonize #WaterIsLife #NativeAmericans
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'Anything that can be built can be taken down': The largest dam removal in US history is complete – what happens next?
The #KlamathRiver is free of four huge dams for the first time in generations. But for the #Yurok tribe, the river's restoration is only just beginning – starting with 18 billion seeds.
by Lucy Sheriff, September 3, 2024
"This is decades and decades in the making," says Thompson. 'We were told it was never going to happen. That it was foolish to even ask for one removal. We were asking for four.'
"The #KlamathBasin covers more than 12,000 square miles (31,000 sq km) in southern Oregon and northern California, and was home to the JC Boyle, Copco 1, Copco 2 and Iron Gate dams, all owned by #PacifiCorp, an electric utilities company. The Klamath was once the third-largest salmon producing river on the US's West Coast before the construction of the dams blocked fish from accessing almost 400 miles (640km) of critical river habitat for almost 100 years.
"Fall #ChinookSalmon numbers plummeted by more than 90% and spring chinook by 98%. #SteelheadTrout, #CohoSalmon and #PacificLamprey numbers also saw drastic declines, and the Klamath tribes in the upper basin have been without their salmon fishery for a century, since the completion of #Copco 1 in 1922. The situation became so bad that Yurok tribe – who are known as the salmon people – began importing Alaskan salmon for their annual salmon festival, traditionally held to celebrate the first return of fall chinook salmon to the Klamath River.
"The dams also had a severe impact on #WaterTemperature and quality – growth of #ToxicAlgae behind two of the dams resulted in health warnings against water contact.
"'It was painful,' says Willard Carlson, a Yurok elder who is known as a #RiverWarrior and was part of the inter-generational campaign. 'All those years seeing our river damaged like that. I remember as a kid we'd have other people from nearby tribes making fun of our river. 'Oh, you're Yurok, your river is dirty.' For us, the #dams were a monument to the [#coloniser] people who conquered us."
[...]
"Restoring the land
But something that does need "a helping hand is the restoration of 2,200 acres (890ha) of land that is above ground for the first time in a century following the emptying of four reservoirs.
"'Removing the dams is one thing, restoring the land is quite another,' says Thompson, a civil engineer and part of the crew working on the restoration project – which is being managed by Resource Environmental Solutions, an ecological restoration company."
#KarukTribe #YurokTribe #KlamathRiverRenewal #RestoreNature #Decolonize #WaterIsLife #NativeAmericans
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'Anything that can be built can be taken down': The largest dam removal in US history is complete – what happens next?
The #KlamathRiver is free of four huge dams for the first time in generations. But for the #Yurok tribe, the river's restoration is only just beginning – starting with 18 billion seeds.
by Lucy Sheriff, September 3, 2024
"This is decades and decades in the making," says Thompson. 'We were told it was never going to happen. That it was foolish to even ask for one removal. We were asking for four.'
"The #KlamathBasin covers more than 12,000 square miles (31,000 sq km) in southern Oregon and northern California, and was home to the JC Boyle, Copco 1, Copco 2 and Iron Gate dams, all owned by #PacifiCorp, an electric utilities company. The Klamath was once the third-largest salmon producing river on the US's West Coast before the construction of the dams blocked fish from accessing almost 400 miles (640km) of critical river habitat for almost 100 years.
"Fall #ChinookSalmon numbers plummeted by more than 90% and spring chinook by 98%. #SteelheadTrout, #CohoSalmon and #PacificLamprey numbers also saw drastic declines, and the Klamath tribes in the upper basin have been without their salmon fishery for a century, since the completion of #Copco 1 in 1922. The situation became so bad that Yurok tribe – who are known as the salmon people – began importing Alaskan salmon for their annual salmon festival, traditionally held to celebrate the first return of fall chinook salmon to the Klamath River.
"The dams also had a severe impact on #WaterTemperature and quality – growth of #ToxicAlgae behind two of the dams resulted in health warnings against water contact.
"'It was painful,' says Willard Carlson, a Yurok elder who is known as a #RiverWarrior and was part of the inter-generational campaign. 'All those years seeing our river damaged like that. I remember as a kid we'd have other people from nearby tribes making fun of our river. 'Oh, you're Yurok, your river is dirty.' For us, the #dams were a monument to the [#coloniser] people who conquered us."
[...]
"Restoring the land
But something that does need "a helping hand is the restoration of 2,200 acres (890ha) of land that is above ground for the first time in a century following the emptying of four reservoirs.
"'Removing the dams is one thing, restoring the land is quite another,' says Thompson, a civil engineer and part of the crew working on the restoration project – which is being managed by Resource Environmental Solutions, an ecological restoration company."
#KarukTribe #YurokTribe #KlamathRiverRenewal #RestoreNature #Decolonize #WaterIsLife #NativeAmericans
-
'Anything that can be built can be taken down': The largest dam removal in US history is complete – what happens next?
The #KlamathRiver is free of four huge dams for the first time in generations. But for the #Yurok tribe, the river's restoration is only just beginning – starting with 18 billion seeds.
by Lucy Sheriff, September 3, 2024
"This is decades and decades in the making," says Thompson. 'We were told it was never going to happen. That it was foolish to even ask for one removal. We were asking for four.'
"The #KlamathBasin covers more than 12,000 square miles (31,000 sq km) in southern Oregon and northern California, and was home to the JC Boyle, Copco 1, Copco 2 and Iron Gate dams, all owned by #PacifiCorp, an electric utilities company. The Klamath was once the third-largest salmon producing river on the US's West Coast before the construction of the dams blocked fish from accessing almost 400 miles (640km) of critical river habitat for almost 100 years.
"Fall #ChinookSalmon numbers plummeted by more than 90% and spring chinook by 98%. #SteelheadTrout, #CohoSalmon and #PacificLamprey numbers also saw drastic declines, and the Klamath tribes in the upper basin have been without their salmon fishery for a century, since the completion of #Copco 1 in 1922. The situation became so bad that Yurok tribe – who are known as the salmon people – began importing Alaskan salmon for their annual salmon festival, traditionally held to celebrate the first return of fall chinook salmon to the Klamath River.
"The dams also had a severe impact on #WaterTemperature and quality – growth of #ToxicAlgae behind two of the dams resulted in health warnings against water contact.
"'It was painful,' says Willard Carlson, a Yurok elder who is known as a #RiverWarrior and was part of the inter-generational campaign. 'All those years seeing our river damaged like that. I remember as a kid we'd have other people from nearby tribes making fun of our river. 'Oh, you're Yurok, your river is dirty.' For us, the #dams were a monument to the [#coloniser] people who conquered us."
[...]
"Restoring the land
But something that does need "a helping hand is the restoration of 2,200 acres (890ha) of land that is above ground for the first time in a century following the emptying of four reservoirs.
"'Removing the dams is one thing, restoring the land is quite another,' says Thompson, a civil engineer and part of the crew working on the restoration project – which is being managed by Resource Environmental Solutions, an ecological restoration company."
#KarukTribe #YurokTribe #KlamathRiverRenewal #RestoreNature #Decolonize #WaterIsLife #NativeAmericans