NGHIÊN CỨU ĐẶC ĐIỂM, XU THẾ BIẾN ĐỔI CỦA MỘT SỐ YẾU TỐ KHÍ HẬU TẠI QUẦN ĐẢO THỔ CHU TRONG NHỮNG NĂM ĐẦU THẾ KỶ XXI

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Tác giả: Thị Thu Hà Lê, Ngọc Tuấn Nguyễn, Thị Kim Anh Ninh, Thị Hương Trần

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học Tài nguyên và Môi trường, 2022

Mô tả vật lý: tr.64-75

Bộ sưu tập: Metadata

ID: 331941

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Climate in the Tho Chu archipelago in the early 21st century showed that the prevailing wind direction was East and Northeast in dry season and West and Southwest in rainy season. The main wind speed was level 2 and had been reducing by 0.1m/s annually. The average air temperature was 27,6 oC and it is “warmer” with the average temperature increased by 0,032 oC/year. Air humidity ranged from 37,5 % - 99,0 %. The average air humidity was about 84 % from June to October and 80 % from December to April next year. Humidity tends to decrease 0,01 %/year. The average air pressure was 1009,9hpa and had an average cycle of 4 - 7 years. The pressure was high in winter and low in summer. There was a slightly increase in pressure with an average increase of 0,02 hpa/year. Total annual rainfall ranged at 1,396 mm - 2,891 mm and the number of rainy days ranged from 200 to 260 days. The number of rainy days and heavy rain days were mainly from May to November. Heavy rainfall was mainly from June to October. Rainy days and rainfall in Tho Chu archipelago had been decreasing gradually with the average amount of rainfall reduction of 21 mm per year.Kết quả nghiên cứu khí hậu 21 năm đầu thế kỷ XXI tại quần đảo Thổ Chu cho thấy, gió biển vào mùa khô có hướng gió thịnh hành là hướng Đông và Đông Bắc, vào mùa mưa có hướng gió thịnh hành là hướng Tây và Tây Nam với tốc độ gió chủ yếu trong cả hai mùa là cấp 2 và xu hướng mỗi năm giảm 0,1 m/s. Nhiệt độ không khí trung bình nhiều năm là 27,6oC và đang có xu hướng không khí “nóng” dần lên, trung bình nhiệt độ tăng 0,032 oC/năm. Độ ẩm không khí dao động từ 37,5 % - 99,0 %, từ tháng 6 - 10 độ ẩm không khí trung bình khoảng 84 %, từ tháng 12 - 4 năm sau độ ẩm không khí khoảng 80%, xu hướng độ ẩm giảm 0,01 %/năm. Khí áp trung bình là 1009,9 hpa và có chu kỳ trung bình từ 4 -7 năm, khí áp cao và mùa đông và thấp vào mùa hè, xu hướng chung khí áp tăng nhẹ, mỗi năm trung bình tăng 0,02 hpa/năm. Tổng lượng mưa hàng năm dao động từ 1.396 mm - 2.891 mm với số ngày mưa dao động từ 200 - 260 ngày. Số ngày mưa, ngày mưa to tập trung chủ yếu từ tháng 5 - 11 với lượng mưa lớn chủ yếu từ tháng 6 - 10. Xu thế ngày mưa và lượng mưa tại quần đảo Thổ Chu đang giảm dần, trung bình mỗi năm lượng mưa giảm 21 mm/năm.

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