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Lake Akan (阿寒湖, Akan-ko) is a lake in Kushiro, Hokkaidō, Japan. It is located in Akan National Park and is a Ramsar Site.[2][3]

Lake Akan
The view from Mount Oakan (July 2008)
Lake Akan
LocationKushiro, Hokkaidō, Japan
Coordinates43°27′6″N 144°5′55″E
Lake typeDimictic
Native name阿寒湖 (Japanese)
Primary outflowsAkan River
Catchment area148 km2 (57 sq mi)
Basin countriesJapan
Surface area13 km2 (3,200 acres)
Average depth17.8 m (58 ft)
Max. depth44.8 m (147 ft)
Water volume0.23 km3 (0.055 cu mi)
Shore length125.9 km (16.1 mi)
Surface elevation420 m (1,380 ft)
FrozenDecember to April
Islands4: Ōjima, Kojima, Yaitai Island, Chūrui Island
SettlementsKushiro
Ramsar Wetland
Official nameAkan-ko
Designated8 November 2005
Reference no.1540[1]
1 Shore length is not a well-defined measure.
Two scenes of the lake in December, 2021
Lake Akan and Mount Oakan
Lake Akan and Mount Oakan

History


Volcanic activity formed the lake some 6,000 years ago, when a lava dam was formed. The lake used to have a clarity of 8–9 meters in the 1930s. Pollution from local hotspring resorts has decreased the transparency to 3–4 meters.[4]


Flora and fauna


The lake is famous for the marimo (Aegagropila linnaei), aggregations of algae that form into spherical shapes 2–30 cm in diameter. Other flora of the lake include the following:[4]

Kokanee salmon (Oncorhynchus nerka) are native to Lake Akan. Other fauna of the lake include the following:[4]

Akan CalderaLake Akan (center)Mount Meakan (bottom left)Mount Oakan (center right)
Akan Caldera
Lake Akan (center)
Mount Meakan (bottom left)
Mount Oakan (center right)

Climate


Climate data for Lake Akan (1991−2020 normals, extremes 1977−present)
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °C (°F) 6.1
(43.0)		 10.8
(51.4)		 16.5
(61.7)		 28.3
(82.9)		 35.5
(95.9)		 34.5
(94.1)		 34.9
(94.8)		 33.9
(93.0)		 31.4
(88.5)		 24.5
(76.1)		 19.0
(66.2)		 11.8
(53.2)		 35.5
(95.9)
Average high °C (°F) −4.2
(24.4)		 −3.1
(26.4)		 1.4
(34.5)		 8.1
(46.6)		 15.1
(59.2)		 18.9
(66.0)		 22.3
(72.1)		 22.8
(73.0)		 19.0
(66.2)		 13.2
(55.8)		 5.8
(42.4)		 −1.4
(29.5)		 9.8
(49.7)
Daily mean °C (°F) −10.0
(14.0)		 −9.4
(15.1)		 −4.2
(24.4)		 2.3
(36.1)		 8.5
(47.3)		 13.1
(55.6)		 17.1
(62.8)		 18.0
(64.4)		 14.0
(57.2)		 7.5
(45.5)		 0.7
(33.3)		 −6.5
(20.3)		 4.3
(39.7)
Average low °C (°F) −16.7
(1.9)		 −16.8
(1.8)		 −10.8
(12.6)		 −3.3
(26.1)		 2.3
(36.1)		 8.0
(46.4)		 12.9
(55.2)		 13.9
(57.0)		 9.3
(48.7)		 2.1
(35.8)		 −4.3
(24.3)		 −12.1
(10.2)		 −1.3
(29.7)
Record low °C (°F) −30.2
(−22.4)		 −30.7
(−23.3)		 −26.6
(−15.9)		 −20.9
(−5.6)		 −7.5
(18.5)		 −3.3
(26.1)		 1.8
(35.2)		 3.2
(37.8)		 −1.2
(29.8)		 −7.6
(18.3)		 −17.3
(0.9)		 −26.9
(−16.4)		 −30.7
(−23.3)
Average precipitation mm (inches) 63.2
(2.49)		 44.5
(1.75)		 70.2
(2.76)		 90.8
(3.57)		 105.7
(4.16)		 84.4
(3.32)		 103.2
(4.06)		 160.0
(6.30)		 165.7
(6.52)		 137.8
(5.43)		 85.2
(3.35)		 87.4
(3.44)		 1,197.9
(47.16)
Average snowfall cm (inches) 132
(52)		 96
(38)		 105
(41)		 54
(21)		 3
(1.2)		 0
(0)		 0
(0)		 0
(0)		 0
(0)		 1
(0.4)		 31
(12)		 123
(48)		 548
(216)
Average precipitation days (≥ 1.0 mm) 10.2 8.9 11.5 11.3 11.0 10.1 10.4 11.4 12.0 10.5 9.8 9.8 126.9
Average snowy days (≥ 3 cm) 12.3 10.4 12.1 7.0 0.4 0 0 0 0 0.1 3.9 13.0 59.2
Mean monthly sunshine hours 97.5 111.9 137.1 154.0 169.4 146.3 132.2 115.7 110.1 123.3 110.6 107.3 1,546
Source: Japan Meteorological Agency[5][6]

See also



References


  1. "Akan-ko". Ramsar Sites Information Service. Retrieved 25 April 2018.
  2. "Data Summary: Akan-ko (Lake Akan)". World Lakes Database. International Lake Environment Committee. Archived from the original on 2012-04-20. Retrieved 2009-05-18.
  3. "Ramsar Sites in Japan - Akan-ko" (PDF). Ministry of the Environment. Retrieved 24 March 2011.
  4. "AKAN-KO (LAKE AKAN)". World Lakes Database. International Lake Environment Committee. Archived from the original on 2012-03-05. Retrieved 2009-05-18.
  5. 観測史上1～10位の値（年間を通じての値）. JMA. Retrieved March 3, 2022.
  6. 気象庁 / 平年値（年・月ごとの値）. JMA. Retrieved March 3, 2022.
Wikimedia Commons has media related to Lake Akan.

На других языках

[de] Akan (See)

Der Akan-See (jap. 阿寒湖 .mw-parser-output .Latn{font-family:"Akzidenz Grotesk","Arial","Avant Garde Gothic","Calibri","Futura","Geneva","Gill Sans","Helvetica","Lucida Grande","Lucida Sans Unicode","Lucida Grande","Stone Sans","Tahoma","Trebuchet","Univers","Verdana"}Akan-ko) ist ein See auf der japanischen Insel und Präfektur Hokkaidō. Der See ist seit dem 4. Dezember 1934 Teil des Akan-Mashū-Nationalparks und wurde zudem am 8. November 2005 als Ramsar-Gebiet ausgewiesen.
- [en] Lake Akan

[fr] Lac Akan

Le lac Akan (阿寒湖, Akan-ko?) est situé à Kushiro, Hokkaidō au Japon. Il se trouve dans le parc national d'Akan et constitue un des sites Ramsar au Japon[1],[2].

[it] Lago Akan

Il lago Akan (阿寒湖 Akan-ko?) è un lago situato nella sottoprefettura di Kushiro dell'isola di Hokkaidō, in Giappone. Si trova all'interno del parco nazionale di Akan e costituisce uno dei siti Ramsar del Giappone[1][2].

[ru] Акан (озеро, Япония)

Акан[2] (Акан-Ко[3]; яп. 阿寒湖 (あかんこ)[1]) — пресноводное горное озеро в восточной части японского острова Хоккайдо. Располагается на территории округа Кусиро в префектуре Хоккайдо[2][1]. Относится к бассейну Тихого океана. Сток из озера идёт на юго-восток через реку Акан, впадающую в залив у города Кусиро[3][2]. Входит в состав национального парка Акан[en][4].


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