A study of gravity waves on planetary atmospheres
Gravity waves (GWs) are internal atmospheric waves that exist on all planetary atmospheres and play an important role in atmospheric coupling, composition, variability, and structure. GWs transport energy and momentum from the lower to the upper atmosphere. GWs can influence upper atmospheric winds,...
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| Format: | Thesis-Doctor of Philosophy |
| Language: | English |
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Nanyang Technological University
2023
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| Online Access: | https://hdl.handle.net/10356/170351 |
| _version_ | 1811682032795779072 |
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| author | Srivastava, Sarthak |
| author2 | Lee Yee Hui |
| author_facet | Lee Yee Hui Srivastava, Sarthak |
| author_sort | Srivastava, Sarthak |
| collection | NTU |
| description | Gravity waves (GWs) are internal atmospheric waves that exist on all planetary atmospheres and play an important role in atmospheric coupling, composition, variability, and structure. GWs transport energy and momentum from the lower to the upper atmosphere. GWs can influence upper atmospheric winds, composition, contribute to turbulence and can play vital roles in influencing the mean circulation and thermal structure of the atmosphere. Despite the key influencing role of GW activity on planetary atmospheres, there is lack of a general numerical model for comparative numerical experimentation. Several numerical models for GW simulation on specific planets exist in the literature. Moreover, most of these models are either, too simplistic and make drastically simplifying assumptions, or they are detailed and require significant computational resources. This study aims to obtain a general understanding of the influence of GW activity on terrestrial planetary atmospheres via creation of a numerical model that is computationally lightweight yet captures the essential nonlinear GW dynamics.
Intra-atmospheric coupling due to GWs is demonstrated by studying the GPS total electron content perturbations induced by waves triggered by the 2004 Sumatra Earthquakes. A two-dimensional nonlinear numerical model is then developed to study atmospheric coupling due to Acoustic Gravity Waves (AGWs) on different planets. The model is validated and applied to real case studies of tsunamigenic GWs on Earth and CO2 ice cloud formation on Mars. The model is further applied to evaluate the detectability of GWs from a spacecraft instrument. Finally, a parametric study is conducted to understand the influence of wave frequency on GW propagation across Earth, Venus, and Mars. |
| first_indexed | 2024-10-01T03:50:24Z |
| format | Thesis-Doctor of Philosophy |
| id | ntu-10356/170351 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:50:24Z |
| publishDate | 2023 |
| publisher | Nanyang Technological University |
| record_format | dspace |
| spelling | ntu-10356/1703512023-10-03T09:52:45Z A study of gravity waves on planetary atmospheres Srivastava, Sarthak Lee Yee Hui School of Electrical and Electronic Engineering Amal Chandran EYHLee@ntu.edu.sg Science::Physics Engineering::Electrical and electronic engineering Gravity waves (GWs) are internal atmospheric waves that exist on all planetary atmospheres and play an important role in atmospheric coupling, composition, variability, and structure. GWs transport energy and momentum from the lower to the upper atmosphere. GWs can influence upper atmospheric winds, composition, contribute to turbulence and can play vital roles in influencing the mean circulation and thermal structure of the atmosphere. Despite the key influencing role of GW activity on planetary atmospheres, there is lack of a general numerical model for comparative numerical experimentation. Several numerical models for GW simulation on specific planets exist in the literature. Moreover, most of these models are either, too simplistic and make drastically simplifying assumptions, or they are detailed and require significant computational resources. This study aims to obtain a general understanding of the influence of GW activity on terrestrial planetary atmospheres via creation of a numerical model that is computationally lightweight yet captures the essential nonlinear GW dynamics. Intra-atmospheric coupling due to GWs is demonstrated by studying the GPS total electron content perturbations induced by waves triggered by the 2004 Sumatra Earthquakes. A two-dimensional nonlinear numerical model is then developed to study atmospheric coupling due to Acoustic Gravity Waves (AGWs) on different planets. The model is validated and applied to real case studies of tsunamigenic GWs on Earth and CO2 ice cloud formation on Mars. The model is further applied to evaluate the detectability of GWs from a spacecraft instrument. Finally, a parametric study is conducted to understand the influence of wave frequency on GW propagation across Earth, Venus, and Mars. Doctor of Philosophy 2023-09-08T05:00:33Z 2023-09-08T05:00:33Z 2023 Thesis-Doctor of Philosophy Srivastava, S. (2023). A study of gravity waves on planetary atmospheres. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/170351 https://hdl.handle.net/10356/170351 10.32657/10356/170351 en This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0). application/pdf Nanyang Technological University |
| spellingShingle | Science::Physics Engineering::Electrical and electronic engineering Srivastava, Sarthak A study of gravity waves on planetary atmospheres |
| title | A study of gravity waves on planetary atmospheres |
| title_full | A study of gravity waves on planetary atmospheres |
| title_fullStr | A study of gravity waves on planetary atmospheres |
| title_full_unstemmed | A study of gravity waves on planetary atmospheres |
| title_short | A study of gravity waves on planetary atmospheres |
| title_sort | study of gravity waves on planetary atmospheres |
| topic | Science::Physics Engineering::Electrical and electronic engineering |
| url | https://hdl.handle.net/10356/170351 |
| work_keys_str_mv | AT srivastavasarthak astudyofgravitywavesonplanetaryatmospheres AT srivastavasarthak studyofgravitywavesonplanetaryatmospheres |