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Sự thu hẹp nhanh chóng của các dòng băng ở khu vực núi Qilian giữa tại Tây Bắc Trung Quốc trong vòng ∼50 năm qua
Journal of Earth Science - 2011
Tóm tắt
Trong vòng năm thập kỷ qua, sự biến động của các dòng băng đã được phục hồi từ tài liệu lịch sử, hình ảnh hàng không, và dữ liệu viễn thám. Từ năm 1956 đến năm 2003, 910 dòng băng được nghiên cứu đã giảm diện tích 21,7% so với giá trị năm 1956, với mức giảm trung bình cho từng dòng băng là 0,10 km2. Mức giảm diện tích tương đối của các dòng băng nhỏ thường cao hơn so với các dòng băng lớn, vốn cho thấy tổn thất tuyệt đối lớn hơn, cho thấy rằng các dòng băng nhỏ nhạy cảm hơn với biến đổi khí hậu so với các dòng băng lớn. Trong khoảng thời gian ∼50 năm qua, diện tích dòng băng đã giảm 29,6% trong lưu vực sông Heihe (黑河) và 18,7% trong lưu vực sông Beidahe (北大河), đây là hai khu vực đã được nghiên cứu trong khu vực núi Qilian giữa (祁连). So với các khu vực khác trong khu vực núi Qilian, sự thu hẹp dòng băng đáng kể nhất đã xảy ra tại khu vực núi Qilian giữa, chủ yếu là do nhiệt độ tăng nhanh. Sự khác biệt khu vực trong thay đổi diện tích dòng băng liên quan đến điều kiện khí hậu địa phương, tỷ lệ tương đối của các dòng băng trong các lớp kích thước khác nhau, và các yếu tố khác.
Từ khóa
#dòng băng #biến đổi khí hậu #nhiệt độ #lưu vực sông Heihe #lưu vực sông Beidahe #khu vực núi QilianTài liệu tham khảo
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