[:ja]NASAの地球観測衛星Terraが撮影した春の五大湖です。春の雪解けが始まっても、雪線はウィスコンシン、ミシガン、オンタリオ州に留まります。この画像では、約20%の湖面積が氷に覆われています。
五大湖は北緯42-50度と全般的に緯度が高く、かつ内陸であるため、冬は非常に寒いです。夏も、湖の水が冷却水の役割を果たしている影響もあって、気温の高くなる地域でも体感的には涼しく感じ、わりあい凌ぎ易くなっています。あまりに寒いため、五大湖はその大きさにもかかわらず、ほとんどの部分が冬季には結氷し、五大湖を経由する河川運輸は冬には停止されます。
地上の様子はこちらです。
参考文献： A Clear Spring View of the Great Lakes (NASA Earth Observatory)
地球俯瞰画像を見る： LiVEARTH
[Earthview Wonders] No.738: Spring of the Great Lakes🇨🇦🇺🇸
NASA’s Terra satellite captured the spring thaw underway in the Great Lakes of North America. While thaw has begun, a snow line still persists through Wisconsin, Michigan, and Ontario. As the snow melts, the line will recede and meltwater will help replenish lake levels. In this image just 20% of the total lake area was still covered with ice.
The Great Lakes are a series of interconnected freshwater lakes primarily in the upper mid-east region of North America, on the Canada–United States border, which connect to the Atlantic Ocean through the Saint Lawrence River. The Great Lakes have a humid continental climate, and winter becomes severe without which halts over-the-water transportation. On March 25, the Soo Locks reopened for the 2019 shipping season.
The local scenery on the ground is as follows.
Reference: A Clear Spring View of the Great Lakes (NASA Earth Observatory)
See earthview photo gallery: LiVEARTH[:en][Earthview Wonders] No.738: Spring of the Great Lakes🇨🇦🇺🇸
NASA’s Terra satellite captured the spring thaw underway in the Great Lakes of North America. While thaw has begun, a snow line still persists through Wisconsin, Michigan, and Ontario. As the snow melts, the line will recede and meltwater will help replenish lake levels. In this image just 20% of the total lake area was still covered with ice.
The Great Lakes are a series of interconnected freshwater lakes primarily in the upper mid-east region of North America, on the Canada–United States border, which connect to the Atlantic Ocean through the Saint Lawrence River. The Great Lakes have a humid continental climate, and winter becomes severe without which halts over-the-water transportation. On March 25, the Soo Locks reopened for the 2019 shipping season.
The local scenery on the ground is as follows.
Reference: A Clear Spring View of the Great Lakes (NASA Earth Observatory)
See earthview photo gallery: LiVEARTH[:]