Development of a combined CloudSat‐CALIPSO cloud mask to show global cloud distribution

Hagihara, Yoshihiro; Okamoto, Hajime; Yoshida, Ryo

doi:10.1029/2009jd012344

Cited by 107 publications

(133 citation statements)

References 55 publications

(65 reference statements)

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“…After that, the dust-containing air may have been transported from the Pacific Ocean to inland Kanto in association with sets). The cloud mask scheme and the discrimination procedure for cloud particle types have been fully documented by Hagihara et al (2010) and Yoshida et al (2010). Figure 2 shows the spatial distribution of SPM concentrations and horizontal wind at 925-hPa in central Japan.…”

Section: Datamentioning

confidence: 99%

Asian Dust Transport to Kanto by Flow around Japan's Central Mountains

Hayasaki

Yamamoto

Higuchi

et al. 2011

SOLA

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During the Typical Asian Dust episode from the end of March−early April 2007 (TAD-2007, the mass concentration of suspended particulate matter (SPM) began to increase rapidly on the morning of 1 April in Hokuriku and Tohoku but remained low in Kanto. Ground-level lidar and rawinsonde sounding in Hokuriku observed a dust layer at ~2 km corresponding to the base of the temperature inversion. In Kanto, which is leeward of Japan's central mountain ranges, SPM increase began from the east coast and then advanced westward after 18 JST with easterly winds. Merged CloudSat and CALIPSO datasets indicated that clouds over mainland Japan and the Sea of Japan were located in the upper-level atmosphere (> 6 km). Continuous meteorological observations showed that cloud condensation and rainfall were not observed over the mountains during the daytime of 1 April. These results suggest that the delay in the SPM increase in Kanto was caused by dust being indirectly transported to that region by flowing around the central mountains. concentrations that affected all of East Asia, and its large-scale three-dimensional structure has been intensively documented in previous studies (e.g., Yumimoto et al. 2008;Park et al. 2010). On a regional scale, however, complex spatial and temporal variations of dust concentrations occurred over Japan. Tsunematsu et al. (2009) examined the regional-scale characteristics of the TAD-2007 using Doppler lidar observations, ground-based meteorological observations, and a regional atmospheric model for the Kanto region on the eastern side of central Japan. They concluded that the surface-based stable layer in Kanto prevented downward transport of elevated dust particles to the ground in the early morning on 1 April. They also noted that the dust layer extended to the ground after breakup of the stable layer. In addition, Takahashi et al. (2010) reported that dust transport from TAD-2007 was delayed over the Kanto plain compared to the highland observatory at Mt. Haruna (1365 m altitude), which is located on the northwestern edge of the plain. In Tsukuba (see Fig. 1b), lidar observations showed that the dust increase started with a southeasterly wind and was restricted to the near surface level (below approximately 1 km) after 16 Japan Standard Time (JST: UTC+9). They noted that the low-level dust layer was advected via a different route to the upper dust layer. Although these studies documented regional-scale features of TAD-2007, there were no sufficient explanations for the delayed dust transport in Kanto on 1 April 2007. From a visible image taken by the Moderate Resolution Imaging Spectroradiometer (MODIS) onboard Aqua, dust plumes and clouds widely covered Japan and surrounding area in the daytime of 1 April (Fig. 1a). Wet deposition processes play an important role in dust scavenging in a downstream region (e.g., Han et al. 2004). IntroductionThe main objective of this study was to identify the major cause(s) for the delay in dust transport to Kanto, Japan. To investigate the temporal and ...

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Section: Datamentioning

confidence: 99%

Asian Dust Transport to Kanto by Flow around Japan's Central Mountains

Hayasaki

Yamamoto

Higuchi

et al. 2011

SOLA

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“…However, there is an abundance of aerosols in the lower troposphere, so it is necessary to appropriately remove contamination by aerosol signals from the low-cloud signals observed by CALIPSO. Hagihara et al (2010) developed a sophisticated algorithm to eliminate aerosol signals from the CALIPSO backscatter data and created cloud mask data (referred to as the KU cloud mask; i.e., the Kyushu University cloud mask product), which they retrieved from the CloudSat and CALIPSO data. Here, we use KU cloud mask data to investigate the vertical structure of low clouds because they are likely to be the most appropriate data for the detailed investigation of such clouds.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the Cloud Top Heights of Marine Boundary Layer Clouds and the Frequency of Marine Fog over Mid-Latitudes

Kawai¹,

Yabu²,

Hagihara

et al. 2015

Journal of the Meteorological Society of Japan

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The cloud top height of marine boundary layer clouds (MBLCs) in the mid-latitudes has received less attention than that of subtropical MBLCs and is investigated here using cloud mask data, which were based on observations from the cloud-aerosol lidar and infrared pathfinder satellite observation (CALIPSO) satellite. This study provides a comprehensive overview of the observational characteristics of variations in cloud top height of MBLCs and fog frequency over the mid-latitudes. Seasonal variations in the cloud top height of mid-latitude MBLCs as well as the differences in these seasonal variations between the Northern and Southern hemispheres were determined. For example, over the North Pacific, the cloud top height is high in winter (up to 1800 m) but low in summer (down to 800 m), whereas in the Southern Hemisphere, the seasonal variation is not well defined, with heights ranging from 1300 to 1500 m. While clear seasonal variations in the frequency of fog occurrence are found over the North Pacific and the northwest Atlantic, the fog frequency over the Southern Ocean is almost constant irrespective of the season. High correlations were found between the MBLC top height and stability indexes and between the fog frequency and some surface parameters such as temperature difference between the surface air and the sea surface. The latitudinal variations in the cloud top height of MBLCs in summer and winter over the Southern Ocean were compared with those over the North Pacific. The difference in cloud top heights between nighttime and daytime is also presented.

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“…Since the CPR and ATLID cloud mask results have differences in spatial resolution and pointing angle, an averaging procedure is necessary to interpolate the two data sets onto a common grid. This can be done in a similar way as in the analysis of CloudSat and CALIPSO [2]. Consequently, we will create four cloud mask schemes: (C1) CPR only cloud mask, (C2) ATLID only mask, (C3) CPR and ATLID cloud mask and (C4) CPR or ATLID cloud mask from these two sensors (for further details see Okamoto et al [7,8].…”

Section: Cloud Mask Algorithmmentioning

confidence: 99%

“…Some of the algorithms have been developed and applied to the CloudSat and CALIPSO [2,3,4,5] and global distribution of the cloud products have been obtained for more than six years. All cloud products have horizontal and vertical resolutions of 1km and 100m, respectively.…”

Section: Introductionmentioning

confidence: 99%

Development of level 2 algorithms for EarthCARE CPR/ATLID

Okamoto¹,

Sato²,

Hagihara

et al. 2013

AIP Conference Proceedings

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Abstract. We develop algorithms that can be applied to EarthCARE Cloud Profiling Radar (CPR) and Atmospheric backscatter LIdar (ATLID) and discuss about the expected products. EarthCARE will carry CPR and ATLID and these combination corresponds to the CloudSat and CALIPSO for the A-train. Due to the similarities between the EarthCARE and the A-train, it will be possible to apply the similar types of algorithms that have been already developed and extensively used for the analyses of the A-train satellites and it is therefore expected to obtain the similar cloud products for the EarthCARE. On the other hand, there are some differences between the EarthCARE and A-train satellites, e.g., the EarthCRAE CPR has better sensitivity compared with the CloudSat. And Doppler capability of the EarthCARE-CPR is a new element and is expected to provide the better constraint for the retrievals of cloud/precipitation microphysics. And the vertical air motion and sedimentation velocity of cloud particles will be inferred.

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Development of a combined CloudSat‐CALIPSO cloud mask to show global cloud distribution

Cited by 107 publications

References 55 publications

Asian Dust Transport to Kanto by Flow around Japan's Central Mountains

Asian Dust Transport to Kanto by Flow around Japan's Central Mountains

Characteristics of the Cloud Top Heights of Marine Boundary Layer Clouds and the Frequency of Marine Fog over Mid-Latitudes

Development of level 2 algorithms for EarthCARE CPR/ATLID

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