Cold trap dehydration in the Tropical Tropopause Layer characterised by SOWER chilled-mirror hygrometer network data in the Tropical Pacific

Hasebe, F.; Inai, Y.; Shiotani, M.; Fujiwara, M.; Voemel, H.; Nishi, N.; Ogino, S. -Y.; Shibata, T.; Iwasaki, S.; Komala, N.; Peter, T.; Oltmans, S. J.

Cold trap dehydration in the Tropical Tropopause Layer characterised by SOWER chilled-mirror hygrometer network data in the Tropical Pacific

Hasebe, F.; Inai, Y.; Shiotani, M. et al.

Atmospheric Chemistry and Physics, 2013, 13(8), 4393-4411

Permalink : https://hdl.handle.net/2115/53047

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アクセス権	open access
URI	https://hdl.handle.net/2115/53047
タイトル	Cold trap dehydration in the Tropical Tropopause Layer characterised by SOWER chilled-mirror hygrometer network data in the Tropical Pacific
著者	Hasebe, F. ; Inai, Y. ; Shiotani, M. ; Fujiwara, M. ; Voemel, H. ; Nishi, N. ; Ogino, S. -Y. ; Shibata, T. ; Iwasaki, S. ; Komala, N. ; Peter, T. ; Oltmans, S. J.
e-Rad_Researcher 00261735 著者名 Hasebe, F.
著者名 Inai, Y.
e-Rad_Researcher 50192604 著者名 Shiotani, M.
著者名 Fujiwara, M.
著者名 Voemel, H.
e-Rad_Researcher 00222183 著者名 Nishi, N.
e-Rad_Researcher 80324937 著者名 Ogino, S. -Y.
e-Rad_Researcher 70167443 著者名 Shibata, T.
著者名 Iwasaki, S.
著者名 Komala, N.
著者名 Peter, T.
著者名 Oltmans, S. J.
言語	英語
発行日	2013-04-26
出版者	Copernicus Gesellschaft Mbh
収録物名	Atmospheric Chemistry and Physics
巻(号)	13(8)
ページ	4393-4411
抄録	A network of balloon-borne radiosonde observations employing chilled-mirror hygrometers for water and electrochemical concentration cells for ozone has been operated since the late 1990s in the Tropical Pacific to capture the evolution of dehydration of air parcels advected quasi-horizontally in the Tropical Tropopause Layer (TTL). The analysis of this dataset is made on isentropes taking advantage of the conservative properties of tracers moving adiabatically. The existence of ice particles is diagnosed by lidars simultaneously operated with sonde flights. Characteristics of the TTL dehydration are presented on the basis of individual soundings and statistical features. Supersaturations close to 80% in relative humidity with respect to ice (RHice) have been observed in subvisible cirrus clouds located near the cold point tropopause at extremely low temperatures around 180 K. Although further observational evidence is needed to confirm the credibility of such high values of RHice, the evolution of TTL dehydration is evident from the data in isentropic scatter plots between the sonde-observed mixing ratio (OMR) and the minimum saturation mixing ratio (SMRmin) along the back trajectories associated with the observed air mass. Supersaturation exceeding the critical value of homogeneous ice nucleation (OMR > 1.6 x SMRmin) is frequently observed on the 360 and 365K surfaces indicating that cold trap dehydration is in progress in the TTL. The near correspondence between the two (OMR similar to SMRmin) at 380K on the other hand implies that this surface is not sufficiently cold for the advected air parcels to be dehydrated. Above 380 K, cold trap dehydration would scarcely function while some moistening occurs before the air parcels reach the lowermost stratosphere at around 400K where OMR is generally smaller than SMRmin.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Creative Commons Attribution 3.0 Unported
PISSN	1680-7316
EISSN	1680-7324
NCID	AA12038447
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.5194/acp-13-4393-2013