Investigating the role of typhoon-induced waves and stratospheric hydration in the formation of tropopause cirrus clouds observed during the 2017 Asian monsoon
<p>We investigate the formation mechanism of a tropopause cirrus cloud layer observed during the Balloon measurement campaigns of the Asian Tropopause Aerosol Layer (BATAL) over Hyderabad (17.47° N, 78.58° E), India, on 23 August 2017. Simultaneous measurements from a backscatter sonde and an...
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Copernicus Publications
2024-12-01
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| Series: | Atmospheric Chemistry and Physics |
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| author | A. K. Pandit J.-P. Vernier J.-P. Vernier T. D. Fairlie K. M. Bedka M. A. Avery H. Gadhavi M. Venkat Ratnam S. Dwivedi K. Amar Jyothi F. G. Wienhold H. Vömel H. Liu H. Liu B. Zhang B. Zhang B. S. Kumar T. Dinh A. Jayaraman A. Jayaraman |
| author_facet | A. K. Pandit J.-P. Vernier J.-P. Vernier T. D. Fairlie K. M. Bedka M. A. Avery H. Gadhavi M. Venkat Ratnam S. Dwivedi K. Amar Jyothi F. G. Wienhold H. Vömel H. Liu H. Liu B. Zhang B. Zhang B. S. Kumar T. Dinh A. Jayaraman A. Jayaraman |
| author_sort | A. K. Pandit |
| collection | DOAJ |
| description | <p>We investigate the formation mechanism of a tropopause cirrus cloud layer observed during the Balloon measurement campaigns of the Asian Tropopause Aerosol Layer (BATAL) over Hyderabad (17.47° N, 78.58° E), India, on 23 August 2017. Simultaneous measurements from a backscatter sonde and an optical particle counter on board a balloon flight revealed the presence of a subvisible cirrus cloud layer (optical thickness <span class="inline-formula">∼</span> 0.025) at the cold-point tropopause (temperature <span class="inline-formula">∼</span> <span class="inline-formula">−</span>86.4 °C, altitude <span class="inline-formula">∼</span> 17.9 km). Ice crystals in this layer are smaller than 50 <span class="inline-formula">µm</span> with a layer mean ice crystal number concentration of about 46.79 <span class="inline-formula">L<sup>−1</sup></span>. Simultaneous backscatter and extinction coefficient measurements allowed us to estimate the range-resolved extinction to backscatter coefficient ratio (lidar ratio) inside this layer with a layer mean value of about 32.18 <span class="inline-formula">±</span> 6.73 sr, which is in good agreement with earlier reported values at similar cirrus cloud temperatures. The formation mechanism responsible for this tropopause cirrus is investigated using a combination of three-dimensional back trajectories, satellite observations, and ERA5 reanalysis data. Satellite observations revealed that the overshooting convection associated with a category 3 typhoon, Hato, which hit Macau and Hong Kong on 23 August 2017, injected ice into the lower stratosphere. This caused a hydration patch that followed the Asian summer monsoon anticyclone to subsequently move towards Hyderabad. The presence of tropopause cirrus cloud layers in the cold temperature anomalies and updrafts along the back trajectories suggested the role of typhoon-induced waves in their formation. This case study highlights the role of typhoons in influencing the formation of tropopause cirrus clouds through stratospheric hydration and waves.</p> |
| format | Article |
| id | doaj-art-78ba3dba5de342468fbb0c0e7a90fb8e |
| institution | Kabale University |
| issn | 1680-7316 1680-7324 |
| language | English |
| publishDate | 2024-12-01 |
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| series | Atmospheric Chemistry and Physics |
| spelling | doaj-art-78ba3dba5de342468fbb0c0e7a90fb8e2024-12-21T01:31:23ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242024-12-0124142091423810.5194/acp-24-14209-2024Investigating the role of typhoon-induced waves and stratospheric hydration in the formation of tropopause cirrus clouds observed during the 2017 Asian monsoonA. K. Pandit0J.-P. Vernier1J.-P. Vernier2T. D. Fairlie3K. M. Bedka4M. A. Avery5H. Gadhavi6M. Venkat Ratnam7S. Dwivedi8K. Amar Jyothi9F. G. Wienhold10H. Vömel11H. Liu12H. Liu13B. Zhang14B. Zhang15B. S. Kumar16T. Dinh17A. Jayaraman18A. Jayaraman19National Institute of Aerospace, Hampton, VA, USANational Institute of Aerospace, Hampton, VA, USAChemistry and Dynamics Branch, NASA Langley Research Center, Hampton, VA, USAChemistry and Dynamics Branch, NASA Langley Research Center, Hampton, VA, USAChemistry and Dynamics Branch, NASA Langley Research Center, Hampton, VA, USAChemistry and Dynamics Branch, NASA Langley Research Center, Hampton, VA, USASpace and Atmospheric Sciences Division, Physical Research Laboratory, Ahmedabad, IndiaAerosols, Radiation and Trace Gases Group, National Atmospheric Research Laboratory (NARL), Gadanki, IndiaMeteorological Centre, India Meteorological Department, Ministry of Earth Sciences, Bhubaneswar, IndiaNational Centre for Medium Range Weather Forecasting, Noida, IndiaInstitute for Atmospheric and Climate Science (IAC), ETH Zurich, Zurich, SwitzerlandEarth Observing Laboratory, National Center for Atmospheric Research, Boulder, CO, USANational Institute of Aerospace, Hampton, VA, USAChemistry and Dynamics Branch, NASA Langley Research Center, Hampton, VA, USANational Institute of Aerospace, Hampton, VA, USAChemistry and Dynamics Branch, NASA Langley Research Center, Hampton, VA, USATata Institute of Fundamental Research Balloon Facility, Hyderabad, IndiaDepartment of Physics, University of Auckland, Auckland, New Zealandformerly at: Aerosols, Radiation and Trace Gases Group, National Atmospheric Research Laboratory (NARL), Gadanki, Indiaretired<p>We investigate the formation mechanism of a tropopause cirrus cloud layer observed during the Balloon measurement campaigns of the Asian Tropopause Aerosol Layer (BATAL) over Hyderabad (17.47° N, 78.58° E), India, on 23 August 2017. Simultaneous measurements from a backscatter sonde and an optical particle counter on board a balloon flight revealed the presence of a subvisible cirrus cloud layer (optical thickness <span class="inline-formula">∼</span> 0.025) at the cold-point tropopause (temperature <span class="inline-formula">∼</span> <span class="inline-formula">−</span>86.4 °C, altitude <span class="inline-formula">∼</span> 17.9 km). Ice crystals in this layer are smaller than 50 <span class="inline-formula">µm</span> with a layer mean ice crystal number concentration of about 46.79 <span class="inline-formula">L<sup>−1</sup></span>. Simultaneous backscatter and extinction coefficient measurements allowed us to estimate the range-resolved extinction to backscatter coefficient ratio (lidar ratio) inside this layer with a layer mean value of about 32.18 <span class="inline-formula">±</span> 6.73 sr, which is in good agreement with earlier reported values at similar cirrus cloud temperatures. The formation mechanism responsible for this tropopause cirrus is investigated using a combination of three-dimensional back trajectories, satellite observations, and ERA5 reanalysis data. Satellite observations revealed that the overshooting convection associated with a category 3 typhoon, Hato, which hit Macau and Hong Kong on 23 August 2017, injected ice into the lower stratosphere. This caused a hydration patch that followed the Asian summer monsoon anticyclone to subsequently move towards Hyderabad. The presence of tropopause cirrus cloud layers in the cold temperature anomalies and updrafts along the back trajectories suggested the role of typhoon-induced waves in their formation. This case study highlights the role of typhoons in influencing the formation of tropopause cirrus clouds through stratospheric hydration and waves.</p>https://acp.copernicus.org/articles/24/14209/2024/acp-24-14209-2024.pdf |
| spellingShingle | A. K. Pandit J.-P. Vernier J.-P. Vernier T. D. Fairlie K. M. Bedka M. A. Avery H. Gadhavi M. Venkat Ratnam S. Dwivedi K. Amar Jyothi F. G. Wienhold H. Vömel H. Liu H. Liu B. Zhang B. Zhang B. S. Kumar T. Dinh A. Jayaraman A. Jayaraman Investigating the role of typhoon-induced waves and stratospheric hydration in the formation of tropopause cirrus clouds observed during the 2017 Asian monsoon Atmospheric Chemistry and Physics |
| title | Investigating the role of typhoon-induced waves and stratospheric hydration in the formation of tropopause cirrus clouds observed during the 2017 Asian monsoon |
| title_full | Investigating the role of typhoon-induced waves and stratospheric hydration in the formation of tropopause cirrus clouds observed during the 2017 Asian monsoon |
| title_fullStr | Investigating the role of typhoon-induced waves and stratospheric hydration in the formation of tropopause cirrus clouds observed during the 2017 Asian monsoon |
| title_full_unstemmed | Investigating the role of typhoon-induced waves and stratospheric hydration in the formation of tropopause cirrus clouds observed during the 2017 Asian monsoon |
| title_short | Investigating the role of typhoon-induced waves and stratospheric hydration in the formation of tropopause cirrus clouds observed during the 2017 Asian monsoon |
| title_sort | investigating the role of typhoon induced waves and stratospheric hydration in the formation of tropopause cirrus clouds observed during the 2017 asian monsoon |
| url | https://acp.copernicus.org/articles/24/14209/2024/acp-24-14209-2024.pdf |
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