High supersaturation inside cirrus in well-developed tropical tropopause layer over Indonesia

Y. Inai; T. Shibata; M. Fujiwara; F. Hasebe; H. Vömel

doi:10.1029/2012GL053638

High supersaturation inside cirrus in well-developed tropical tropopause layer over Indonesia

Y. Inai, T. Shibata, M. Fujiwara, F. Hasebe, H. Vömel

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Abstract

The relationship between relative humidity and cirrus clouds in the tropical tropopause layer (TTL) is investigated using balloon-borne cryogenic frostpoint hygrometers (CFH) and quasi-collocated measurements of space-borne Cloud- Aerosol Lidar with Orthogonal Polarization (CALIOP) over Biak (1.17°S, 136.06°E) and Kototabang (0.20°S, 100.32°E) both in Indonesia in Januaries 2007 and 2008. At Kototabang, thin layers of high supersaturation, up to ∼160% in relative humidity with respect to ice (RHi), are often observed co-existing with cirrus clouds at altitudes of ∼15-18 km. At Biak, RHi inside cirrus is around 100% or less without large supersaturation layers, and most clouds are limited to altitudes below 16 km. We found that the presence and the degree of supersaturation may strongly depend on the phases of large-scale disturbances such as the MJO rather than geographical difference.

Original language	English
Article number	L20811
Journal	Geophysical Research Letters
Volume	39
Issue number	20
DOIs	https://doi.org/10.1029/2012GL053638
State	Published - Oct 28 2012

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title = "High supersaturation inside cirrus in well-developed tropical tropopause layer over Indonesia",

abstract = "The relationship between relative humidity and cirrus clouds in the tropical tropopause layer (TTL) is investigated using balloon-borne cryogenic frostpoint hygrometers (CFH) and quasi-collocated measurements of space-borne Cloud- Aerosol Lidar with Orthogonal Polarization (CALIOP) over Biak (1.17°S, 136.06°E) and Kototabang (0.20°S, 100.32°E) both in Indonesia in Januaries 2007 and 2008. At Kototabang, thin layers of high supersaturation, up to ∼160\% in relative humidity with respect to ice (RHi), are often observed co-existing with cirrus clouds at altitudes of ∼15-18 km. At Biak, RHi inside cirrus is around 100\% or less without large supersaturation layers, and most clouds are limited to altitudes below 16 km. We found that the presence and the degree of supersaturation may strongly depend on the phases of large-scale disturbances such as the MJO rather than geographical difference.",

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T1 - High supersaturation inside cirrus in well-developed tropical tropopause layer over Indonesia

AU - Inai, Y.

AU - Shibata, T.

AU - Fujiwara, M.

AU - Hasebe, F.

AU - Vömel, H.

PY - 2012/10/28

Y1 - 2012/10/28

N2 - The relationship between relative humidity and cirrus clouds in the tropical tropopause layer (TTL) is investigated using balloon-borne cryogenic frostpoint hygrometers (CFH) and quasi-collocated measurements of space-borne Cloud- Aerosol Lidar with Orthogonal Polarization (CALIOP) over Biak (1.17°S, 136.06°E) and Kototabang (0.20°S, 100.32°E) both in Indonesia in Januaries 2007 and 2008. At Kototabang, thin layers of high supersaturation, up to ∼160% in relative humidity with respect to ice (RHi), are often observed co-existing with cirrus clouds at altitudes of ∼15-18 km. At Biak, RHi inside cirrus is around 100% or less without large supersaturation layers, and most clouds are limited to altitudes below 16 km. We found that the presence and the degree of supersaturation may strongly depend on the phases of large-scale disturbances such as the MJO rather than geographical difference.

AB - The relationship between relative humidity and cirrus clouds in the tropical tropopause layer (TTL) is investigated using balloon-borne cryogenic frostpoint hygrometers (CFH) and quasi-collocated measurements of space-borne Cloud- Aerosol Lidar with Orthogonal Polarization (CALIOP) over Biak (1.17°S, 136.06°E) and Kototabang (0.20°S, 100.32°E) both in Indonesia in Januaries 2007 and 2008. At Kototabang, thin layers of high supersaturation, up to ∼160% in relative humidity with respect to ice (RHi), are often observed co-existing with cirrus clouds at altitudes of ∼15-18 km. At Biak, RHi inside cirrus is around 100% or less without large supersaturation layers, and most clouds are limited to altitudes below 16 km. We found that the presence and the degree of supersaturation may strongly depend on the phases of large-scale disturbances such as the MJO rather than geographical difference.

UR - https://www.scopus.com/pages/publications/84868307411

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DO - 10.1029/2012GL053638

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SN - 0094-8276

VL - 39

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 20

M1 - L20811

ER -

High supersaturation inside cirrus in well-developed tropical tropopause layer over Indonesia

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