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A model study on the influence of overshooting convection on TTL water vapour

by R. A. Anthes, William J. Randel, Dian J. Seidel, Laura L Pan, G. a. Hajj, E. Robert Kursinski, L J Romans, W I Bertiger, Stephen S. Leroy, Z. Kuang, C. Bretherton, A. Gettelman, T. Birner, Kevin M. Grise, David W.J. C. Thompson, Xiaolei Zou, Li Lin, William J. Randel, Fei Wu, Waleska Rios, C. Schiller, J.-U. Grooß, P. Konopka, F. Plöger, F. H. Silva dos Santos, N. Spelten, H. Kim, a. E. Dessler, Joowan Kim, Seok-Woo Son, P Alexander, A de la Torre, P Llamedo, R Hierro, S. M. Khaykin, J.-P. Pommereau, A. Hauchecorne, U Das, C J Pan, Chuntao Liu, Edward J. Zipser, D P Grosvenor, T W Choularton, H Coe, G Held, Z. Liu, D. Ostrenga, W. Teng, S. Kempler, Christian D. Kummerow, W. Barnes, T. Kozu, J. Shiue, J. Simpson, In-Sun Song, Hye-Yeong Chun, Todd P. Lane, William J. Randel, Fei Wu, Tianle Yuan, Zhanqing Li, W. S. Schreiner, C. Rocken, Sergey V. Sokolovskiy, Stig Syndergaard, Douglas C. Hunt, S. C. Sherwood, T. Horinouchi, H. Zeleznik, R. A. Anthes, D. Ector, Douglas C. Hunt, Y-H. H Kuo, C. Rocken, W. S. Schreiner, Sergey V. Sokolovskiy, Stig Syndergaard, T-K. Wee, Z. Zeng, P. A. Bernhardt, K. F. Dymond, Y. Chen, H. Liu, K. Manning, William J. Randel, K. E. Trenberth, L. Cucurull, S. B. Healy, S-P. Shu-Peng Ho, C. McCormick, T. K. Meehan, David W.J. C. Thompson, N. L. Yen, M E E Hassim, Todd P. Lane, T. Rieckh, B. Scherllin-Pirscher, F. Ladstädter, U. Foelsche, J H Chae, D. L. Wu, William G. Read, S. C. Sherwood, Olga P. Verkhoglyadova, Stephen S. Leroy, Co- I Chi O. Ao, B Pirscher, U. Foelsche, M Borsche, G Kirchengast, Y-H. H Kuo, Bomin Sun, Anthony Reale, Dian J. Seidel, Douglas C. Hunt, Xiaolei Zou, S. Yang, P. S. Ray, Chuntao Liu, Edward J. Zipser, Stephen W. Nesbitt, a. R. Jain, V. Panwar, T. K. Mandal, V. R. Rao, A. Goel, R. Gautam, S. S. Das, S. K. Dhaka, a. R. Jain, A. Goel, T. K. Mandal, V. R. Rao, S. K. Dhaka, D P Dee, S M Uppala, A J Simmons, P Berrisford, P Poli, S Kobayashi, U Andrae, M A Balmaseda, G Balsamo, P Bauer, P Bechtold, A C M Beljaars, L Van De Berg, J Bidlot, N Bormann, C Delsol, R Dragani, M Fuentes, A J Geer, T. Flury, D. L. Wu, William G. Read, J. R. Taylor, William J. Randel, E. J. Jensen, S. P. Alexander, T. Tsuda, Y. Kawatani, M. Takahashi, Pao K. PK Wang, Shih-hao Su, Zdeněk Charvát, Jindřich Šťástka, Hsin-Mu Lin, Feiqin Xie, D. L. Wu, Co- I Chi O. Ao, Anthony J. Mannucci, W. S. Schreiner, Sergey V. Sokolovskiy, Douglas C. Hunt, C. Rocken, Y-H. H Kuo, E. Robert Kursinski, G. a. Hajj, J T Schofield, R P Linfield, K R Hardy, Li Lin, Xiaolei Zou, R. A. Anthes, Y-H. H Kuo, Riccardo Biondi, William J. Randel, S-P. Shu-Peng Ho, Torsten Neubert, Stig Syndergaard, B. Scherllin-Pirscher, G Kirchengast, A K Steiner, Y-H. H Kuo, U. Foelsche, C. Holloway, J.D. Neelin, Co- I Chi O. Ao, T. K. Meehan, G. a. Hajj, A J Manucci, Georg Beyerle, Philippe Lopez, Sergey V. Sokolovskiy, Axel von Engeln, Feiqin Xie, Stig Syndergaard, E. Robert Kursinski, Benjamin M. Herman, Arthur Y. Hou, Ramesh K. Kakar, Steven Neeck, Ardeshir A. Azarbarzin, Christian D. Kummerow, Masahiro Kojima, Riko Oki, Kenji Nakamura, Toshio Iguchi, Anthony Bucholtz, Dennis L Hlavka, Matthew J McGill, K Sebastian Schmidt, Peter Pilewskie, Sean M Davis, Elizabeth a Reid, Annette L Walker, Min Deng, Gerald G. Mace, Zhien Wang, Hajime Okamoto, W. Frey, S. Borrmann, F. Fierli, R. Weigel, V. Mitev, R. Matthey, F. Ravegnani, N. M. Sitnikov, A. Ulanovsky, F. Cairo, A E Luebke, A. Afchine, A Costa, J Meyer, C Rolf, N. Spelten, P Keckhut, F Borchi, S Bekki, A. Hauchecorne, M SiLaouina, Gerald G. Mace, Min Deng, Brian Soden, Edward J. Zipser, Guillaume Mioche, Damien Josset, Jean-François François Gayet, Jacques Pelon, Anne Garnier, Andreas Minikin, Alfons Schwarzenboeck, Kenneth Sassen, James R. Campbell, C. Schiller, M. Krämer, A. Afchine, N. Spelten, N. M. Sitnikov, Hui Su, Jonathan H. Jiang, Xiaohong Liu, Joyce E. Penner, William G. Read, Steven Massie, Mark R. Schoeberl, Peter R. Colarco, Nathaniel J. Livesey, Michelle L. Santee, Axel von Engeln, João Teixeira, Georg Beyerle, Kuo Ying Wang, D. M. Winker, Jacques Pelon, J. A. Coakley, S. A. Ackerman, R. J. Charlson, Peter R. Colarco, P. Flamant, Q. Fu, R. M. Hoff, C. Kittaka, T. L. Kubar, H. Le Treut, M. P. McCormick, G. Mégie, L. Poole, K. Powell, C. Trepte, M. A. Vaughan, B. A. Wielicki, N. P. Hindley, C. J. Wright, N. D. Smith, N. J. Mitchell, E. Robert Kursinski, G. a. Hajj, Stephen S. Leroy, Benjamin M. Herman, Y. Durga Santhi, M. Venkat Ratnam, S. K. Dhaka, S. Vijayabhaskara Rao, Dian J. Seidel, Panagiotis Vergados, Anthony J. Mannucci, Co- I Chi O. Ao, R Ware, M Exner, D Feng, M Gorbunov, K R Hardy, W Melbourne, C. Rocken, W. S. Schreiner, S Sokolovski, F Solheim, Xiaolei Zou, R. A. Anthes, S Businger, K. E. Trenberth, Riccardo Biondi, S-P. Shu-Peng Ho, William J. Randel, Stig Syndergaard, Torsten Neubert, Chuntao Liu, Panagiotis Vergados, Zhengzhao Johnny Luo, K. Emanuel, Anthony J. Mannucci, Christina Wall, Edward J. Zipser, Chuntao Liu, Tianle Yuan, Lorraine a. Remer, Kenneth E. Pickering, Hongbin Yu, P I Feiqin Xie, Co- I Chi O. Ao, D P Grosvenor, T W Choularton, H Coe, G Held, M E E Hassim, Todd P. Lane, a. R. Jain, V. Panwar, T. K. Mandal, V. R. Rao, A. Goel, R. Gautam, S. S. Das, S. K. Dhaka, S. Jain, a. R. Jain, T. K. Mandal, Pao K. PK Wang, Chunpeng Wang, Zhengzhao Johnny Luo, Xiuhong Chen, Xiping Zeng, Wei-Kuo Tao, Xianglei Huang, Christopher A. Davis, David A. Ahijevych, Julie A. Haggerty, Michael J. Mahoney, A. Gettelman, T. Birner, F. J. Robinson, S. C. Sherwood, Susan Solomon, Katrina S. Virts, John M. Wallace show all authors
Journal of the Atmospheric Sciences ()
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Abstract

Overshooting deep convection that penetrates into the Tropical Tropopause Layer (TTL) is thought to have an important role in regulating the water vapour content of this region. Yet, the net effect of such convection and the dominant mechanisms remain unclear. This study uses two idealised three-dimensional cloud-resolving model simulations to examine the influence of overshooting convection on water vapour when it penetrates into two different TTL environments, one supersaturated and the other subsaturated with respect to ice. These simulations show that the overshooting convection plays a direct role in driving the ambient environment towards ice saturation through either net moistening (subsaturated TTL) or net dehydration (supersaturated TTL). Moreover, in these cases the extent of dehydration in supersaturated conditions is greater than the moistening in subsaturated conditions. With the aid of modelled passive tracers, the relative roles of transport, mixing and ice microphysics are assessed; ultimately, ice sublimation and scavenging processes play the most important role in defining the different TTL relative humidity tendencies. In addition, significant moistening in both cases is modelled well into the subsaturated tropical lower stratosphere (up to 450 K), even though the overshooting turrets only reach approximately 420 K. It is shown that this moistening is the result of jumping cirrus, which is induced by the localised upward transport and mixing of TTL air following the collapse of the overshooting turret.

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