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مباحث عمومی هواشناسی
- شروع کننده موضوع Amir Mohsen
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Amir Mohsen
متخصص بخش هواشناسی
ارتفاع ژئوپتانسیل در زمان سیل پاکستان:
Amir Mohsen
متخصص بخش هواشناسی
Rich Marine Life in Antarctic Fjord Is Puzzling Scientists
By Tim Radford, Climate News Network
LONDON – Arctic fjords are poor places, low in marine life and muddied by glacial melt water. In the southern ocean, where everything is upside down, it’s a different story. Scientists from the University of Hawaii report that they found unexpected riches deep in the fjords of the Antarctic Peninsula.
Giant bristle worm from Andvord Bay, Antarctica, which scientists discovered is a fjord hotspot for biodiversity.
Credit: Craig Smith, University of Hawaii at Manoa via Climate News Network
The Peninsula is one of the fastest-warming places on the planet. On land, researchers have used 150 years of moss growth as a kind of archive of change, and recorded a warming of 0.56°C per decade since the 1960s.
But researchers who photographed the sea floor found an abundance of bristle worms, sea spiders, sea cucumbers, crustaceans, jellyfish and of krill, they report in the journal PLOS One.
This is precisely what they had not expected: on the evidence of the rapidly-warming Arctic waters, these Peninsula fjords should have been much less lively.
“There appears to be something special about these fjords that stimulates sea floor productivity,” says Laura Grange, of the UK National Oceanography Center at the University of Southampton, who collaborated in the study.
[h=3]Change on the Way? “Seafloor ecosystems at the bottom of fjords rely on detritus for food, so these Antarctic fjords must be getting some sort of enhanced food input, most likely from phytoplankton blooms, micro-algal debris or even from krill – their molted carapaces or the dead bodies that sink to the bottom.”
Humpback whales forage in those waters, and their excrement, too, may fertilize life at the sea bottom. But although the fjords are rich in life, they may not stay that way.
The Antarctic Peninsula is one of the fastest-warming places on the planet, according to researchers.
Credit: Craig Smith, University of Hawaii at Manoa
The Antarctic Peninsula warming is at a much earlier stage than the Arctic warming, and so far the fjords show little disturbance from glacial melting. Icebergs drift out so sea without dropping much sediment, which keeps the waters clear, and permits phytoplankton and algae to bloom. As the climate warms, these conditions could change.
“The extraordinary ecosystems, which provide habitat and foraging areas for krill and baleen whales and are hotspots of seafloor diversity, are very likely to be negatively impacted by the very rapid warming occurring along the Antarctic Peninsula”, says Craig Smith of the University of Hawaii Mānoa. The guess is that such marine communities play an important role in providing food for fish, penguins and whales.
“We urgently need to develop a better understanding of the structure, function and climate sensitivity of these fascinating and imperiled seafloor communities.”
Tim Radford is a reporter for Climate News Network. Climate News Network is a news service led by four veteran British environmental reporters and broadcasters. It delivers news and commentary about climate change for free to media outlets worldwide.
- Published: December 26th, 2013
By Tim Radford, Climate News Network
LONDON – Arctic fjords are poor places, low in marine life and muddied by glacial melt water. In the southern ocean, where everything is upside down, it’s a different story. Scientists from the University of Hawaii report that they found unexpected riches deep in the fjords of the Antarctic Peninsula.
Credit: Craig Smith, University of Hawaii at Manoa via Climate News Network
The Peninsula is one of the fastest-warming places on the planet. On land, researchers have used 150 years of moss growth as a kind of archive of change, and recorded a warming of 0.56°C per decade since the 1960s.
But researchers who photographed the sea floor found an abundance of bristle worms, sea spiders, sea cucumbers, crustaceans, jellyfish and of krill, they report in the journal PLOS One.
This is precisely what they had not expected: on the evidence of the rapidly-warming Arctic waters, these Peninsula fjords should have been much less lively.
“There appears to be something special about these fjords that stimulates sea floor productivity,” says Laura Grange, of the UK National Oceanography Center at the University of Southampton, who collaborated in the study.
[h=3]Change on the Way? “Seafloor ecosystems at the bottom of fjords rely on detritus for food, so these Antarctic fjords must be getting some sort of enhanced food input, most likely from phytoplankton blooms, micro-algal debris or even from krill – their molted carapaces or the dead bodies that sink to the bottom.”
Humpback whales forage in those waters, and their excrement, too, may fertilize life at the sea bottom. But although the fjords are rich in life, they may not stay that way.
Credit: Craig Smith, University of Hawaii at Manoa
The Antarctic Peninsula warming is at a much earlier stage than the Arctic warming, and so far the fjords show little disturbance from glacial melting. Icebergs drift out so sea without dropping much sediment, which keeps the waters clear, and permits phytoplankton and algae to bloom. As the climate warms, these conditions could change.
“The extraordinary ecosystems, which provide habitat and foraging areas for krill and baleen whales and are hotspots of seafloor diversity, are very likely to be negatively impacted by the very rapid warming occurring along the Antarctic Peninsula”, says Craig Smith of the University of Hawaii Mānoa. The guess is that such marine communities play an important role in providing food for fish, penguins and whales.
“We urgently need to develop a better understanding of the structure, function and climate sensitivity of these fascinating and imperiled seafloor communities.”
Tim Radford is a reporter for Climate News Network. Climate News Network is a news service led by four veteran British environmental reporters and broadcasters. It delivers news and commentary about climate change for free to media outlets worldwide.
ali_kermanshah
کاربر ويژه
سلام دوستان
انگار فعلا جنوب ایران بارش داره و بخش شمالی خبری نیست ....
انگار فعلا جنوب ایران بارش داره و بخش شمالی خبری نیست ....
بیگانی رفسنجان
کاربر ويژه
روح الله جان چرا جنوب بهتره بگی جنوب غرب.......ما که تو نقشه ها بارشی تو جنوب کشورنداریم......
Amir Mohsen
متخصص بخش هواشناسی
Long range - 30 day
Outlook for 31st December – 9th January
Conditions through this period will be cool and rather unsettled. The most unsettled conditions will be across Northern and Western areas of the UK with showers or spells of rain likely through the period, whilst the best of any drier interludes will be across Southern and Eastern areas, though even here spells of rain or showers are likely to be most dominant. Behind each low pressure system colder air will move in to the UK, bringing the risk of snow to higher ground, and perhaps to lower levels at times in the far North. Temperatures through the period are likely to be close to or very slightly below the seasonal average, with precipitation slightly above average.
Outlook for 10th January – 26th January
There is still greater than average uncertainty for this period but the most likely scenario at present is for the unsettled conditions to the North and West of the UK to continue making inroads across much of the country at times bringing some less settled conditions for many areas, though it is Northern and Western areas who will remain most prone to these conditions. Once again behind each successive low pressure system colder air will flood in to the UK bringing the risk of some snow to higher ground. There is a risk though through this period of colder conditions developing more widely for a time with blocking high pressure forming just to the North or East of the UK, though this is hugely uncertain at this stage. Temperatures and precipitation will remain close to average.
Forecast Updated: 10:50 on Friday 27th December 2013
Outlook for 31st December – 9th January
Conditions through this period will be cool and rather unsettled. The most unsettled conditions will be across Northern and Western areas of the UK with showers or spells of rain likely through the period, whilst the best of any drier interludes will be across Southern and Eastern areas, though even here spells of rain or showers are likely to be most dominant. Behind each low pressure system colder air will move in to the UK, bringing the risk of snow to higher ground, and perhaps to lower levels at times in the far North. Temperatures through the period are likely to be close to or very slightly below the seasonal average, with precipitation slightly above average.
Outlook for 10th January – 26th January
There is still greater than average uncertainty for this period but the most likely scenario at present is for the unsettled conditions to the North and West of the UK to continue making inroads across much of the country at times bringing some less settled conditions for many areas, though it is Northern and Western areas who will remain most prone to these conditions. Once again behind each successive low pressure system colder air will flood in to the UK bringing the risk of some snow to higher ground. There is a risk though through this period of colder conditions developing more widely for a time with blocking high pressure forming just to the North or East of the UK, though this is hugely uncertain at this stage. Temperatures and precipitation will remain close to average.
Forecast Updated: 10:50 on Friday 27th December 2013
mahmood600
کاربر ويژه
بار دیگر رکوردهای شمالغرب کشور از سرما شکست
بار دیگر رکوردهای شمالغرب کشور از سرما شکست
بار دیگر رکوردهای شمالغرب کشور از سرما شکست
سراب 27.2-بستان اباد 25-فرودگاه اردبیل و دیواندره 24.6-سقز 24.5-خیراباد زنجان 23.8-اشنویه 22.6-ورزقان 21.8-فیروزاباد اردبیل 21.6-قره ضیاالدین ملکان و میاندواب.20.4-خوی 20.2-
mahmood600
کاربر ويژه
[h=3]Winter Storm Gemini's Power Outages: Ice Not Going AnywhereAfter a Christmas in the dark, the ice isn't melting, and some people in Michigan and New England are still without power.
mahmood600
کاربر ويژه
East Coast Faces Heavy Rain, Snow This Weekend
Amir Mohsen
متخصص بخش هواشناسی
mahmood600
کاربر ويژه
بعضی سایت ها که برای رشت پیش بینی میکنن میگن دی ماه برف میاد تا کمر که چرتی پیش نیست
اخه خدایا مرد تو هواشناسی گیلان کار میکنه وقتی برف میخواد بیاد دوز قبلش اعلام میکنه حالا جالبه همونم درست از اب نمیاد و این کارشتاس 15 سال سابقه کاری داره بعد بعضی سایت ها میان میگن از 45 روز قبلش برف میاد انوم تا کمر اخه چند بار مردم سرکار میزاری از خدا بترس واینم بگم این سایت ها بار اولشونم نیست این پیش بینی ها غلط رو میکنن سالهاست دارن با درست کردن جو خیالی بازدیید کنند هاشونو زیاد میکنن از خدا بترسید کمتر به مردم دروغ بگید ؛اصلا این سایت اغصابم خورد کردن( وخیلی های دیگه رو که به من تماس گرفتن گفتن از همین مسله گله کردن) خجالتم نمکشن بخدا میدونن خبری نیست فقط الکی جو میدن .یکم جان من یکم خجالت بکشین.ببخشید دیگه اعصلبتونو خورد کردم
فقط خدا باید شفاشون بده.
اخه خدایا مرد تو هواشناسی گیلان کار میکنه وقتی برف میخواد بیاد دوز قبلش اعلام میکنه حالا جالبه همونم درست از اب نمیاد و این کارشتاس 15 سال سابقه کاری داره بعد بعضی سایت ها میان میگن از 45 روز قبلش برف میاد انوم تا کمر اخه چند بار مردم سرکار میزاری از خدا بترس واینم بگم این سایت ها بار اولشونم نیست این پیش بینی ها غلط رو میکنن سالهاست دارن با درست کردن جو خیالی بازدیید کنند هاشونو زیاد میکنن از خدا بترسید کمتر به مردم دروغ بگید ؛اصلا این سایت اغصابم خورد کردن( وخیلی های دیگه رو که به من تماس گرفتن گفتن از همین مسله گله کردن) خجالتم نمکشن بخدا میدونن خبری نیست فقط الکی جو میدن .یکم جان من یکم خجالت بکشین.ببخشید دیگه اعصلبتونو خورد کردم
فقط خدا باید شفاشون بده.
[h=4]Forecast For MASHHAD
| The report was made 18 minutes ago, at 17:39 UTC |
| Forecast valid from 27 at 18 UTC to 28 at 24 UTC |
| Wind 05 m/s from east/southeast |
| Visibility 3000 m |
| Few clouds at a height of 914 m Broken clouds at a height of 3048 m |
| mist |
| Temporary from 27 at 18 UTC to 28 at 03 UTC |
| Wind 05 m/s from east/northeast |
| Visibility 1000 m |
| Probability 40% between 08 and 00 UTC |
| fog |
| Becoming from 28 at 05 UTC to 28 at 07 UTC |
| Visibility 6000 m |
| Becoming from 28 at 18 UTC to 28 at 20 UTC |
| Visibility 4000 m |
| mist |
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