Tin tức và sự kiện

Metan trong khí quyển cao nhất 400.000 năm qua

Cập nhật lúc: 8:53:33 SA - 06/03/2010

TTO - Một nghiên cứu trên Journal Science cho biết hiện nay khí metan - loại khí gây ra hiệu ứng nhà kính 30 lần mạnh hơn CO2 - đang thoát khỏi biển nhanh hơn dự kiến.

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Hình chụp Bắc Băng Dương từ vệ tinh - Ảnh: Reuters

Những bọt khí metan đang ngày đêm được giải phóng ở khu vực băng của Bắc Cực. Các nhà khoa học cho biết khí metan được giữ trong tầng đất bị đóng băng vĩnh cửu nhưng hiện nay tình trạng Trái đất nóng dần lên khiến lượng băng này tan ra và giải phóng khí metan.

Natalia Shakhova, thuộc Trung tâm nghiên cứu Bắc Cực quốc tế của ĐH Alasaka và là đồng tác giả công trình, cho biết: "Lượng khí metan được giải phóng tại Bắc Cực ở phía đông Serbia bằng với toàn bộ lượng metan do các đại dương khác thải ra".

Trong quá khứ, lượng khí metan tập trung trong khí quyển dao động từ 0,3-0,4 phần triệu trong mùa lạnh và 0,6-0,7 trong mùa ấm. Tuy nhiên hiện nay lượng khí metan tập trung ở khu vực Bắc Cực là 1,85 phần triệu, con số cao nhất trong 400.000 năm qua.

 

Đ.K.L. (Theo AP)

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