BIẾN ĐỘNG MỘT SỐ YẾU TỐ KHÍ TƯỢNG VÀ HẢI DƯƠNG HỌC NGHỀ CÁ VÙNG BIỂN VỊNH BẮC BỘ GIAI ĐOẠN 1/2019

BIẾN ĐỘNG MỘT SỐ YẾU TỐ KHÍ TƯỢNG VÀ HẢI DƯƠNG HỌC NGHỀ CÁ VÙNG BIỂN VỊNH BẮC BỘ GIAI ĐOẠN 1/2019 - 6/2021

0 Người đánh giá. Xếp hạng trung bình 0

Tác giả: Ngọc Tuấn Nguyễn, Thị Thùy Dương Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học Công nghệ và Thực phẩm (Tên mới: Tạp chí Khoa học Đại học Công Thương), 2022

Mô tả vật lý: tr.63

Bộ sưu tập: Metadata

ID: 333239

Thêm vào giỏ Liên kết toàn văn

Bài báo sử dụng phương pháp phân tích thống kê và nội suy không gian nhằm đánh giá biến động của của một số yếu tố khí tượng (gió, nhiệt độ không khí, độ ẩm không khí và khí áp) và hải dương học nghề cá (nhiệt độ nước, Cl-a) vùng biển vịnh Bắc Bộ. Các kết quả phân tích, đánh giá cho thấy: Mùa gió đông bắc từ tháng 11 đến tháng 3 năm sau với hướng gió chủ đạo là Đông Bắc, Bắc và Đông. Vận tốc gió trung bình đạt 5,4 m/s (tương đương với cấp gió chủ yếu là 2, 3). Mùa gió tây nam kéo dài từ tháng 5 đến tháng 9 hướng gió thịnh hành là Nam, Đông Nam và cấp gió chủ yếu là gió cấp 2 và cấp 3, 4. Trong giai đoạn tháng 1/2019 - 6/2021 xuất hiện 3 cơn bão rất mạnh, vận tốc cực đại trong bão lên đến 60 m/s. Nhiệt độ không khí dao động khoảng 18,2°C - 30,9°C, trung bình là 25,1°C. Độ ẩm không khí dao động 67% - 91,2%, trung bình đạt 81,6%. Khí áp dao động 1003,2 - 1018,8 Hpa, trung bình 1011,1 Hpa. Khí áp đạt giá trị cao trong mùa gió đông bắc (tháng 1, 2) ngược lại đạt giá trị thấp trong mùa gió tây nam (tháng 6-8). Mùa gió đông bắc, nhiệt độ nước biển tầng mặt dao động từ 12,0°C - 34,0°C, trung bình là 23,5°C ngưỡng nhiệt phổ biến là 24,0°C - 26,0°C. Mùa gió tây nam, nhiệt độ khoảng 20,7°C - 35,0°C và phần lớn là ở ngưỡng nhiệt 30,0°C - 31,0°C. Phân bố theo hướng tăng dần từ bắc xuống nam, từ tây sang đông. Hàm lượng Chlorophyll-a trung bình trong hai mùa gió lần lượt là 1,63 mg/m3
0,89 mg/m3 và chiếm tỷ lệ cao nhất ở khoảng giá trị 0 - 1 mg/m3 . Xu hướng phân bố Chlorophyll-a cao ở khu vực ven bờ Nam Định, Thanh Hóa, thấp nhất ở khu vực giữa vịnh và cửa vịnh khoảng 0,2 - 0,60 mg/m3 .The Gulf of Tonkin is located in the tropical monsoon region, which is governed by atmospheric circulation, so the meteorological and oceanic conditions have a distinct seasonal character in the northeast moonsoon season and southwest monsoon season. The article used statistical methods, spatial interpolation to clearly show the characteristics of the Gulf of Tonkin sea area. The northeast monsoon from November to March next year, the main wind direction is Northeast, North and East. The average wind speed is 5,4 m/s, the main wind level is wind level 2 and 3. The southwest monsoon season from May to September, the prevailing wind direction is South, Southeast and the main wind supply level 2 and level 3, 4. During the study period, there were 3 super typhoons appeared with wind speed up to 60 m/s. The air temperature fluctuates around 18,2°C - 30,9°C, the average was 25,1°C. The average air humidity reaches 81,6%. The pressure ranged from 1003.2 to 1018.8 Hpa, with an average. The pressure reached a high value in the northeast monsoon season (January, February) which was low in the southwest monsoon (June, July, August). In the northeast season, the surface sea water temperature ranged from 11,0°C to 34,0°C, the average temperature was 23,5°C, the common temperature threshold was 24,0°C - 26,0°C. In the southwest season, the temperature was about 20,7°C - 35,0°C and mostly in the range of 30,0°C - 31,0°C, distributed in increasing direction from North to South, from West to East. The average concentrations of Chlorophyll-a in the two wind seasons were 1,63 mg/m3 and 0,89 mg/m3 respectively and accounted for the highest percentage in the range of values 0 - 1 mg/m3 . The distribution trend was high in the coastal areas of Nam Dinh, Thanh Hoa, the lowest in the area between the bay and the mouth of the bay, about 0,2 - 0,6 mg/m3 .

1. Đọc trực tuyến

1. Đọc trực tuyến

Tạo bộ sưu tập với mã QR