Hoạt động dao động quasi-27 ngày từ tầng đối lưu đến tầng giữa và tầng nhiệt ở vĩ độ thấp

Earth, Planets and Space - 2021
H. Cheng1, Kai Huang1, Alan Liu2, Zhang Shaodong1, Chunming Huang1, Yun Gong3
1School of Electronic Information, Wuhan University, Wuhan 430072, China
2Department of Physical Science, Embry-Riddle Aeronautical University, Daytona Beach, FL, USA
3Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan, China

Tóm tắt

Tóm tắtSử dụng radar khí tượng, quan sát radiosonde và dữ liệu tái phân tích MERRA-2 từ 12 tháng 8 đến 31 tháng 10 năm 2006, chúng tôi báo cáo về sự kết hợp động lực từ bầu khí quyển thấp nhiệt đới đến tầng giữa và tầng nhiệt dưới thông qua một dao động giữa mùa quasi-27 ngày (ISO). Thật thú vị là ISO quasi-27 ngày được quan sát thấy trong các khu vực tầng đối lưu, tầng phân bố và tầng giữa, thể hiện một cấu trúc ba lớp. Trong tầng giữa và tầng nhiệt dưới, biên độ của gió theo phương zonal tăng từ khoảng 4 ms−1 ở độ cao 90 km lên 15 ms−1 ở độ cao 100 km, điều này khác với các quan sát trước đây cho rằng ISOs xảy ra chủ yếu vào mùa đông với một đỉnh biên độ ở khoảng 80–90 km, sau đó nhanh chóng suy yếu khi chiều cao tăng lên. Bức xạ sóng dài (OLR) và độ ẩm đặc trưng cho thấy có một chu kỳ quasi-27 ngày trong hoạt động đối lưu ở vùng khí nhiệt đới, điều này gây ra ISO của gió zonal và hoạt động sóng trọng lực (GW) trong tầng đối lưu. Các GW đi lên được điều chế thêm bởi dao động trong tầng đối lưu và tầng phân bố trên. Khi các GW lan truyền lên tầng giữa và tầng nhiệt dưới, dao động quasi-27 ngày trong trường gió được sinh ra với một pha rõ ràng ngược lại với pha trong bầu khí quyển thấp thông qua sự không ổn định và tiêu tán của các GW được điều chế này. Phân tích wavelet cho thấy sự biến thiên quasi-27 ngày trong tầng giữa và tầng nhiệt dưới xuất hiện như một sự kiện cụ thể hơn là một hiện tượng kéo dài, và không có một mối quan hệ tương ứng rõ ràng với tác động của quay mặt trời trong vòng 1 năm quan sát.

Từ khóa


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