Wednesday, 24 June 2015

Arctic Ice report 2015


Bad, but could be still worse. The ice extension is a little under average in the Arctic; there are regions where it exceeded the usual expectations: Greenland, the Canadian Archipelago and eastern Russia have good ice covering; part of Alaska, the Bering Sea and the Barents Sea, on the contrary, are lacking the average amount of ice due to a higher sea temperature.

Two below-average ice areas : one east of Scandinavia on the Berents Sea, the other in far-east siberian coast on the Bering sea, the area of the North-Pacific ocean vortex (or gyro).

The polar ice cap has been thick enough; the weakest ice parts on the Barents may be related to the Murmansk - Arkhangelsk pollution and growing marine traffic. Or to the norwegian oil platforms.


Ice extent average  for May. Ups and downs, but with a decreasing trend.
http://nsidc.org/arcticseaicenews/


On the other hand, the May ice extent in the Antarctic is not only above average, but in record high levels of all months for years. The ice extent keeps growing at a higher rate than the decreasing ice rate in the Artic.

Despite some local voids, ice extension exceeds average. An Australian station had even to close, lacking access.


It looks as if an ice transfer was taking place from one pole to the other.


Sources: NSIDC / NASA


Saturday, 20 June 2015

Solstice this Sunday:
longest day, longest night

On this 21st of June, 7% of mankind will have no daylight, but a long 24 hours night. On the other hand, in Europe and North America, this shall be the longest day.


North of the Arctic Circle (66º 30' N), on Sunday 21, there will be full 24 h daylight.

Salekhard, Russia (66º 53')  ): the sun barely touches the horizon, and then starts rising again.

Iqaluit, Canada (63º 43' N): daylight for 20h 12m

Anchorage, Alaska (61º 13' N): sunrise at 4:20, sunset at 23:42 , that's 19 h sunlight.

Antarctic Circle (66º 30' S): on Sunday, there is a brief peak of light on the horizon, a few seconds, and the Sun vanishes. More southernly, a long 24 hours night.

City
Country
Latitude
Sunrise
Sunset
Day Length
Greenland
77° 29'
None
None
24:00
Norway
69° 40'
None
None
24:00
Alaska
64° 54'
02:56
00:52
21:56
Alaska
61° 09'
04:21
23:42
19:21
Russia
59° 53'
04:35
23:25
18:50


An excellent interactive map:
http://time.unitarium.com/events/longest-day.html



Have a nice Solstice !


Friday, 12 June 2015

Thanks, Hobart and Invercargill upside-down !

These two cities, which are near-antipodes of mine (Porto, Portugal), show the blue mark in the Blogger's visit map as recent (and frequent) visitors.


Porto: 41°9′N, 8°36′W
Invercargill: 46° 24' S, 168º 24' E
Hobart: 42° 52' S, 147° 19' E

To be perfect antipodes, they should have the same degrees of latitude, one North and the other South; and the longitudes should sum 180º.

Anyhow, that's really far far away, and it's amazing to be visited from that distance. Miracles of the Internet.

Welcome, dear 'antipodes', all the best !