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  • 1
    Series available for loan
    Series available for loan
    Cambrian through Mississippian rocks of the Powder River Basin, Wyoming, Montana, and adjacent areas (1993)
    Washington, DC : United States Gov. Print. Off.
    Associated volumes
    Details Availability
    Call number: SR 90.0001(1917-M)
    In: U.S. Geological Survey bulletin
    Type of Medium: Series available for loan
    Pages: VI, M-174 S. + 2 pl.
    Series Statement: U.S. Geological Survey bulletin 1917-M
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
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    The expedition of the research vessel "Polarstern" to the Antarctic in 2008 (ANT-XXIV/4) [Elektronische Ressource] (2009)
    Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung
    Associated volumes
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    Call number: ZSP-168-591
    In: Berichte zur Polar- und Meeresforschung
    Type of Medium: 12
    Pages: Online-Ressource (64 S.). : Ill., graph. Darst.
    Series Statement: Berichte zur Polar- und Meeresforschung 591
    URL: http://hdl.handle.net/10013/epic.32648.d001
    Language: English
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 3
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    Uranium distribution and geology in the Fish Lake surficial uranium deposit, Esmeralda County, Nevada (1990)
    Washington, DC : United States Gov. Print. Off.
    Associated volumes
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    Call number: SR 90.0001(1910)
    In: U.S. Geological Survey bulletin
    Type of Medium: Series available for loan
    Pages: III, 22 S.
    Series Statement: U.S. Geological Survey bulletin 1910
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 4
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    The expedition ANTARKTIS-XXIII/10 of the research vessel "Polarstern" in 2007 [Elektronische Ressource] (2008)
    Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung
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    Call number: ZSP-168-575
    In: Berichte zur Polar- und Meeresforschung
    Type of Medium: 12
    Pages: Online-Ressource (37 S.).
    Series Statement: Berichte zur Polar- und Meeresforschung 575
    URL: http://hdl.handle.net/10013/epic.30677.d001
    Language: English
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  • 5
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    A Standardized Atmospheric Measurement Data Archive for Distributed Cloud and Precipitation Process-Oriented Observations in Central Europe (2019)
    In:  Bulletin of the American Meteorological Society
    Details
    Publication Date: 2020-02-12
    Description: Central Europe has a vital and extensive meteorological research community comprising national weather services, universities, and research organizations and institutes. Nearly all of them are involved in the open scientific questions regarding clouds and precipitation processes. The research activities include observations (from in situ ground-based remote sensing radio soundings to satellite-based observations), model development on all scales (from direct numerical simulations to global climate models), and other activities. With Germany as an example our first objective is to show the large amount and the diversity of observations regarding clouds and precipitation. The goal is to give an overview of existing measurements and datasets to show the benefit of combining the different information from a variety of observations. Up to now the access to and the usage of these datasets from different sources was not straightforward, due to the issue of missing data and archiving standards for observational data. This then motivates our second objective, which is to introduce our solution for this issue—the novel Standardized Atmospheric Measurement Data archive (SAMD). SAMD is one of the outcomes of the German research initiative High Definition Clouds and Precipitation for Advancing Climate Prediction [HD(CP)2]. The goal of SAMD is an easy-to-use approach for both data producers and archive users. Therefore the archive provides observational data in the common Climate Forecast (CF) Conventions format and makes it available to the broader public. SAMD offers highly standardized quality-controlled data and metadata for a wide range of instruments, with open access, which makes this novel archive important for the research community.
    Language: English
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 6
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    Overview of the MOSAiC expedition—Atmosphere (2022)
    In:  Elementa - Science of the Anthropocene
    Details
    Publication Date: 2022-02-09
    Description: With the Arctic rapidly changing, the needs to observe, understand, and model the changes are essential. To support these needs, an annual cycle of observations of atmospheric properties, processes, and interactions were made while drifting with the sea ice across the central Arctic during the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition from October 2019 to September 2020. An international team designed and implemented the comprehensive program to document and characterize all aspects of the Arctic atmospheric system in unprecedented detail, using a variety of approaches, and across multiple scales. These measurements were coordinated with other observational teams to explore cross-cutting and coupled interactions with the Arctic Ocean, sea ice, and ecosystem through a variety of physical and biogeochemical processes. This overview outlines the breadth and complexity of the atmospheric research program, which was organized into 4 subgroups: atmospheric state, clouds and precipitation, gases and aerosols, and energy budgets. Atmospheric variability over the annual cycle revealed important influences from a persistent large-scale winter circulation pattern, leading to some storms with pressure and winds that were outside the interquartile range of past conditions suggested by long-term reanalysis. Similarly, the MOSAiC location was warmer and wetter in summer than the reanalysis climatology, in part due to its close proximity to the sea ice edge. The comprehensiveness of the observational program for characterizing and analyzing atmospheric phenomena is demonstrated via a winter case study examining air mass transitions and a summer case study examining vertical atmospheric evolution. Overall, the MOSAiC atmospheric program successfully met its objectives and was the most comprehensive atmospheric measurement program to date conducted over the Arctic sea ice. The obtained data will support a broad range of coupled-system scientific research and provide an important foundation for advancing multiscale modeling capabilities in the Arctic.
    Language: English
    Type: info:eu-repo/semantics/article
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  • 7
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    The MOSAiC Research Cruise in the Context of Decadal-Scale Changes in Arctic Clouds and Radiation Budget (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-07-10
    Description: The Arctic is a hotspot of climate change and is currently undergoing rapid changes in particular in its snow and sea-ice cover, and near-surface air temperature. While observations document these changes, the underlying processes and feedbacks contributing to this phenomenon called Arctic amplification are not fully understood, and limit our ability to predict the future evolution of the Arctic climate system.Within this presentation, the 20+ year climate data record of the Clouds and the Earth’s Radiant Energy System (CERES) project will be used to analyze changes of the surface radiation budget across the Arctic, and investigate the role of clouds in these changes. The focus is directed to the identification of significant trends in contrast to internal climate variability. Attention is also directed to regional contrasts and the seasonality of changes. Results are combined with and contrasted to the ERA5 reanalysis, attempting to reconcile differences and interpreting these changes as part of the Arctic surface energy budget.Subsequently, our results are used to provide context for the observations of the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC ) expedition. Specifically, we will attempt to answer the following questions: do MOSAiC observations confirm the CERES and ERA5 data sets in terms of cloud radiative effects? Given the availability of 20 years of CERES data before MOSAiC: would we have expected significant differences in the MOSAiC observations of clouds and radiative fluxes, if the expedition had taken place at the start of the CERES data record?
    Language: English
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  • 8
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    The Small-Scale Variability of Solar Radiation (S2VSR) Campaign – Overview and first Results (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-07-05
    Description: The solar radiation incident at the earth surface is a driving component of the surface energy budget. It often exhibits significant small-scale variability due to its modulation by clouds, in particular for shallow cumulus. This variability limits the representativity of tradiational point-like observations for extended spatial domains such as satellite pixels and model grid boxes. It also causes large fluctuations in power generation by photovoltaic systems. To better characterize this small-scale variability, TROPOS has developed a unique sensor network consisting of 100 autonomous pyranometers which record global radiation, temperature and relative humidity at a frequency of 1-Hz. It is thus capable of resolving fluctuations down to the second and decameter scale, as demonstrated for several past campaigns in Germany. The upcoming S2VSR campaign will deploy 60 of these stations at the Central Facility of the ARM Southern Great Plains site in the United States, distributed across a 6x6 km2 domain during summer 2023.The campaign will offer unique opportunities for the analysis of these data together with operational measurements at the ARM site. This specifically includes high-accuracy surface radiation, active cloud profiling, and the Clouds Optically Gridded by Stereo 4-D cloud product. A comparison with satellite observations from geostationary (GOES-R ABI data at 1-min and 500-m resolution) and polar orbit (Sentinel-2 at 10m) is also planned. The overarching goal is an improved understanding of the small-scale variability and 3D radiative effects of solar radiation. This contribution will present first observations from the ongoing campaign, and give a perspective on future plans.
    Language: English
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  • 9
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    Low-level Arctic clouds: The hidden key component of the radiation budget (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-08-30
    Description: To understand the feedbacks driving the amplified changes in the Arctic a quantification of the contribution of the involved processes is necessary. Here a detailed study of low-level Arctic clouds on the surface radiation budget is presented. These clouds frequently occur below the lowest detection range of most state-of-the-art remote-sensing instruments and were observed in summertime during 25% of the time over the marginal sea ice zone. The low altitude of these clouds poses challenges on their observation and characterization by remote-sensing techniques. Ground-based remote sensing and surface radiation flux measurements performed during the Arctic cruise PS106 in 2017 were combined with radiative transfer simulations to study low-level clouds. A multiwavelength lidar PollyXT with near-range observations capabilities down to 50m and a cloud radar with a lowest detection limit at 165m altitude were operated continuously. The liquid-water microphysical properties of clouds missed by the cloud radar were estimated using measurements of a microwave radiometer HATPRO and the lidar-detected cloud base. Thereby the surface radiative effect of these clouds was quantified. A closure between the observed and modelled radiative surface fluxes was achieved with a realistic representation of low-level liquid-containing clouds in the radiative transfer model. When omitting these low-level clouds, the cloud radiative effect at the surface was misestimated by 43Wm−2. The presented study highlights the importance of improving cloud retrievals for low-level liquid-containing clouds as they are frequently encountered in the high Arctic, together with observational capabilities, both in terms of cloud remote sensing and radiative flux observations.
    Language: English
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  • 10
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    Investigation of radiative closure and cloud radiative effects based on ground-based and satellite observations during MOSAiC (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
    Details
    Publication Date: 2023-09-29
    Description: Significant uncertainties in the prediction of future warming in the Arctic arise from our lack of understanding of governing processes, including cloud radiative feedbacks. The present study compares preliminary simulations of 1D radiative fluxes based on the Cloudnet and ShupeTurner cloud retrievals for the yearlong Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) expedition. The analysis is conducted in the context of a radiative closure study at the surface and the top-of-the atmosphere for the upward and downward broadband solar and terrestrial radiative fluxes. The consistency of our simulations and satellite-based estimates from the Clouds and the Earth’s Radiant Energy System (CERES) are analysed by considering several atmospheric and surface-type conditions. Particular focus is given to the effect of clouds on the radiation budget. Based on our simulations and CERES estimates, we find that clouds increase the net radiative fluxes at the surface by about 35.5 W/m² for the entire MOSAiC expedition period. Nevertheless, based on in-situ observations, it is argued that significant uncertainties in the solar and terrestrial affect this estimate of cloud radiative effects. Our research will also address the spatiotemporal variability of clouds and how this might impact the comparison between the point-like ground measurements with the CERES satellite footprint.
    Language: English
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