Parallel Developments and Formal Collaboration between European Atmospheric Profiling Observatories and the U.S. ARM Research Program

Haeffelin, Martial; Crewell, Susanne; Illingworth, A. J.; Pappalardo, Gelsomina; Russchenberg, H.W.J.; Chiriaco, Marjolaine; Ebell, Kerstin; Hogan, Robin J.; Madonna, Fabio

doi:10.1175/amsmonographs-d-15-0045.1

Cited by 10 publications

(3 citation statements)

References 165 publications

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“…The southeast Pacific hosts one of the largest and most persistent stratocumulus cloud decks on Earth, as shown by Wood (2012) using data from the combined land-ocean cloud atlas database (Hahn and Warren, 2007). In this region, cloud cover and cloud thickness have major impacts on the net cloud radiative effect, which raises the importance of studying the heights of these clouds.…”

Section: Southeast Pacificmentioning

confidence: 99%

Cloud base height retrieval from multi-angle satellite data

et al. 2019

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Abstract. Clouds are a key modulator of the Earth energy budget at the top of the atmosphere and at the surface. While the cloud top height is operationally retrieved with global coverage, only few methods have been proposed to determine cloud base height (zbase) from satellite measurements. This study presents a new approach to retrieve cloud base heights using the Multi-angle Imaging SpectroRadiometer (MISR) on the Terra satellite. It can be applied if some cloud gaps occur within the chosen distance of typically 10 km. The MISR cloud base height (MIBase) algorithm then determines zbase from the ensemble of all MISR cloud top heights retrieved at a 1.1 km horizontal resolution in this area. MIBase is first calibrated using 1 year of ceilometer data from more than 1500 sites within the continental United States of America. The 15th percentile of the cloud top height distribution within a circular area of 10 km radius provides the best agreement with the ground-based data. The thorough evaluation of the MIBase product zbase with further ceilometer data yields a correlation coefficient of about 0.66, demonstrating the feasibility of this approach to retrieve zbase. The impacts of the cloud scene structure and macrophysical cloud properties are discussed. For a 3-year period, the median zbase is generated globally on a 0.25∘ × 0.25∘ grid. Even though overcast cloud scenes and high clouds are excluded from the statistics, the median zbase retrievals yield plausible results, in particular over ocean as well as for seasonal differences. The potential of the full 16 years of MISR data is demonstrated for the southeast Pacific, revealing interannual variability in zbase in accordance with reanalysis data. The global cloud base data for the 3-year period (2007–2009) are available at https://doi.org/10.5880/CRC1211DB.19.

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Section: Southeast Pacificmentioning

confidence: 99%

Cloud base height retrieval from multi-angle satellite data

et al. 2019

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“…The event brought together scientists (instructors) from the United States and Europe with expertise in instrumentation, retrieval techniques, and modeling with a range of scientific focus. This not only enabled the participants to interact with experts with different scientific cultures and focuses but also fostered collaborations between U.S. and European counterparts (Haeffelin et al 2016). With 19 (out of 61) applicants, 4 (out of 24) selected participants, and 4 (out of 12) instructors from institutions outside of the United States, the event highlighted interest in the ARM data and the training event from the international scientific community.…”

Section: ) Precipitation Microphysics: This Group Projectmentioning

confidence: 99%

The Second ARM Training and Science Application Event: Training the Next Generation of Atmospheric Scientists

Ghate

Kollias

Crewell

et al. 2019

Bulletin of the American Meteorological Society

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“…At the same time, with the support of national weather services or research institutes, a number of atmospheric profiling observatories have been set up to establish formal collaborations with the DOE ARM program [ 9 ]. In particular, cloud radar profiling observations were only available in specific sites in France, Germany, UK, and Ireland.…”

Section: Introductionmentioning

confidence: 99%

Cloud and Precipitation Profiling Radars: The First Combined W- and K-Band Radar Profiler Measurements in Italy

Montopoli

Bracci

Adirosi

et al. 2023

Sensors

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Clouds cover substantial parts of the Earth’s surface and they are one of the most essential components of the global climate system impacting the Earth’s radiation balance as well as the water cycle redistributing water around the globe as precipitation. Therefore, continuous observation of clouds is of primary interest in climate and hydrological studies. This work documents the first efforts in Italy in remote sensing clouds and precipitation using a combination of K- and W-band (24 and 94 GHz, respectively) radar profilers. Such a dual-frequency radar configuration has not been widely used yet, but it could catch on in the near future given its lower initial cost and ease of deployment for commercially available systems at 24 GHz, with respect to more established configurations. A field campaign running at the Casale Calore observatory at the University of L’Aquila, Italy, nestled in the Apennine mountain range is described. The campaign features are preceded by a review of the literature and the underpinning theoretical background that might help newcomers, especially in the Italian community, to approach cloud and precipitation remote sensing. This activity takes place in interesting time for radar sensing clouds and precipitation, stimulated both by the launch of the ESA/JAXA EarthCARE satellite missions scheduled in 2024, which will have on-board, among other instruments, a W-band Doppler cloud radar and the proposal of new missions using cloud radars currently undergoing their feasibility studies (e.g., WIVERN and AOS in Europe and Canada, and U.S., respectively)

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Parallel Developments and Formal Collaboration between European Atmospheric Profiling Observatories and the U.S. ARM Research Program

Cited by 10 publications

References 165 publications

Cloud base height retrieval from multi-angle satellite data

Cloud base height retrieval from multi-angle satellite data

The Second ARM Training and Science Application Event: Training the Next Generation of Atmospheric Scientists

Cloud and Precipitation Profiling Radars: The First Combined W- and K-Band Radar Profiler Measurements in Italy

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