Differences in ice cloud microphysical properties between western and eastern tropical pacific regions derived from cloudsat and CALIPSO measurements

Naoya Takahashi, Tadahiro Hayasaka, Hajime Okamoto

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1 Citation (Scopus)

Abstract

We revealed the difference in the ice cloud microphysical properties of high clouds between the western Pacific (WP) and eastern Pacific (EP) regions, based on satellite retrievals. The effective particle radius (re) was analyzed by using active sensors on board the CloudSat and CALIPSO satellites. We focused on ice clouds, defined as clouds with cloud top temperatures of less than 0°C. These ice clouds are classified into five types defined by the cloud optical thickness (COT). Mean cloud top heights of high cloud in WP were higher than those in EP by about 2km. The re of optically thin clouds (0 < COT < 0.3) showed weak temperature dependency over both regions. For optically thick clouds (3 < COT), re increases with temperature (T). In the WP, re at lower temperatures (T < -40°C) is larger than that in the EP, whereas in the EP, re at higher temperatures (T > -40°C) is larger than that in the WP. The difference in re may be caused by differences in moisture convergence and upward motion.

Original languageEnglish
Pages (from-to)91-95
Number of pages5
JournalScientific Online Letters on the Atmosphere
Volume12
DOIs
Publication statusPublished - Jan 1 2016

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CloudSat
CALIPSO
ice
moisture
sensor

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

Cite this

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abstract = "We revealed the difference in the ice cloud microphysical properties of high clouds between the western Pacific (WP) and eastern Pacific (EP) regions, based on satellite retrievals. The effective particle radius (re) was analyzed by using active sensors on board the CloudSat and CALIPSO satellites. We focused on ice clouds, defined as clouds with cloud top temperatures of less than 0°C. These ice clouds are classified into five types defined by the cloud optical thickness (COT). Mean cloud top heights of high cloud in WP were higher than those in EP by about 2km. The re of optically thin clouds (0 < COT < 0.3) showed weak temperature dependency over both regions. For optically thick clouds (3 < COT), re increases with temperature (T). In the WP, re at lower temperatures (T < -40°C) is larger than that in the EP, whereas in the EP, re at higher temperatures (T > -40°C) is larger than that in the WP. The difference in re may be caused by differences in moisture convergence and upward motion.",
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AU - Takahashi, Naoya

AU - Hayasaka, Tadahiro

AU - Okamoto, Hajime

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N2 - We revealed the difference in the ice cloud microphysical properties of high clouds between the western Pacific (WP) and eastern Pacific (EP) regions, based on satellite retrievals. The effective particle radius (re) was analyzed by using active sensors on board the CloudSat and CALIPSO satellites. We focused on ice clouds, defined as clouds with cloud top temperatures of less than 0°C. These ice clouds are classified into five types defined by the cloud optical thickness (COT). Mean cloud top heights of high cloud in WP were higher than those in EP by about 2km. The re of optically thin clouds (0 < COT < 0.3) showed weak temperature dependency over both regions. For optically thick clouds (3 < COT), re increases with temperature (T). In the WP, re at lower temperatures (T < -40°C) is larger than that in the EP, whereas in the EP, re at higher temperatures (T > -40°C) is larger than that in the WP. The difference in re may be caused by differences in moisture convergence and upward motion.

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