Results 1 to 10 of about 5,271 (55)

Twomey effect observed from collocated microphysical and remote sensing measurements over shallow cumulus [PDF]

Journal of Geophysical Research: Atmospheres, 2014
Clear experimental evidence of the Twomey effect for shallow trade wind cumuli near Barbados is presented. Effective droplet radius (reff) and cloud optical thickness (τ), retrieved from helicopter‐borne spectral cloud‐reflected radiance measurements, and spectral cloud reflectivity (γλ) are correlated with collocated in situ observations of the number
Heike Wex, Susan Hartmann, T. Schmeissner, Gregory Roberts, Holger Siebert, M. Simmel, Florian Ditas, Raymond A. Shaw, Frank Werner, Peter Pilewskie, Birgit Wehner, Manfred Wendisch   +11 more
openaire   +2 more sources

Error Decomposition of Remote Sensing Soil Moisture Products Based on the Triple-Collocation Method Introducing an Unbiased Reference Dataset: A Case Study on the Tibetan Plateau [PDF]

Remote Sensing, 2020
Remote sensing (RS) soil moisture (SM) products have been widely used in various environmental studies. Understanding the error structure of data is necessary to properly apply RS SM products in trend and variation analysis and data fusion. However, a spatially continuous assessment of RS SM datasets is impeded by the limited spatial distribution of ...
Jian Kang, Rui Jin, Xin Li, Yang Zhang
openaire   +3 more sources

Automated ground-based remote sensing measurements of greenhouse gases at the Białystok site in comparison with collocated in situ measurements and model data [PDF]

Atmospheric Chemistry and Physics, 2011
Abstract. The in situ boundary layer measurement site in Białystok (Poland) has been upgraded with a fully automated observatory for total greenhouse gas column measurements. The automated Fourier Transform Spectrometer (FTS) complements the on-site in situ facilities and FTS solar absorption measurements have been recorded nearly continuously in clear
Christoph Gerbig, Christine Weinzierl, Christian Rödenbeck, W. Ruhe, Justus Notholt, Huilin Chen, Nicholas M. Deutscher, P. Grupe, Jost V. Lavric, Krzysztof Katrynski, Frank-Thomas Koch, J. Messerschmidt, J. Messerschmidt, Thorsten Warneke   +13 more
openaire   +7 more sources

Towards an Algorithm for Retrieval of the Parameters of the Marine Atmospheric Boundary Layer at High Wind Speeds Using Collocated Aircraft and Satellite Remote Sensing

Journal of Marine Science and Engineering, 2022
A method has been developed for the retrieval of the atmospheric boundary layer parameters in tropical cyclones, namely the dynamic speed, the wind speed at a 10 m height, and the roughness parameter. For the analysis, the wind speed profiles were obtained from NOAA GPS-dropsondes and collocated with the data from the Stepped-Frequency Microwave ...
Evgeny Poplavsky, Nikita Rusakov, Olga Ermakova, Daniil Sergeev, Yuliya Troitskaya   +4 more
openaire   +2 more sources

A Composite Method for Predicting Local Accuracies in Remotely Sensed Land-Cover Change Using Largely Non-Collocated Sample Data [PDF]

Remote Sensing, 2019
As in conventional error matrix-based accuracy assessments, collocated reference sample data are often used for characterizing per-pixel (local) accuracies in land-cover change maps so that local accuracy predictions can be made using direct methods. In that way, correctness in “from-to” change categorization at sample pixels is assessed and modeled ...
Yingying Mei, Jingxiong Zhang, Wangle Zhang, Fengzhu Liu   +3 more
openaire   +2 more sources

Toward the GMF for Wind Speed and Surface Stress Retrieval in Hurricanes Based on the Collocated GPS-Dropsonde and Remote Sensing Data

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2020
This article describes the first step toward the development of the geophysical model function (GMF) for the retrieval of wind speed and wind stress in hurricanes, based on developing a relation between the cross-polarized satellite SAR data from Sentinel-1 and winds/stress observed from collocated NOAA GPS-dropsondes data.
Olga Stanislavovna Ermakova, Daniil Alexandrovich Sergeev, Nikita Sergeevich Rusakov, Evgeny Ivanovich Poplavsky, Galina Nikolaevna Balandina, Yuliya Igorevna Troitskaya   +5 more
openaire   +3 more sources

Inconsistencies of interannual variability and trends in long-term satellite leaf area index products [PDF]

, 2017
Understanding the long-term performance of global satellite leaf area index (LAI) products is important for global change research. However, few effort has been devoted to evaluating the long-term time-series consistencies of LAI products.
Claverie, Martin, Fang, Hongliang, Jiang, Chongya, Myneni, Ranga, Ryu, Youngryel, Zhu, Zaichun   +5 more
core   +1 more source

Review and assessment of latent and sensible heat flux accuracy over the global oceans [PDF]

, 2017
For over a decade, several research groups have been developing air-sea heat flux information over the global ocean, including latent (LHF) and sensible (SHF) heat fluxes over the global ocean.
A. Anderson, A. Bentamy, A. Grouazel, Akima, Andersson, Andersson, Andersson, Atlas, Ayina, B. Chapron, Beljaars, Bentamy, Bentamy, Bentamy, Bentamy, Berry, Bosilovich, Bradley, Brodeau, C.A. Clayson, C.J. Merchant, Casey, Charnock, Chou, Chou, Clayson, Danielson, Danielson, Dee, F. Paul, Fairall, Freeman, Gille, Grodsky, Gruber, Gulev, Gulev, Gulev, Gulev, Gulev, H. Azelmat, H. Evers-King, Hubert, I. Esau, J.A. Johannessen, J.F. Piollé, Josey, Josey, K. Haines, K. von Schuckmann, Kurihara, Lock, Louis, M. Bourassa, M. Valdivieso, McColl, Mestas-Nuñez, Mestas-Nuñez, P.P. Mathieu, R. Danielson, R. Hollmann, R.T. Pinker, Reynolds, Reynolds, Rienecker, Roberts, S. Gulev, S. Sathyendranath, S.A. Grodsky, S.A. Josey, S.R. Smith, Saha, Sapiano, Schlussel, Simmons, Smith, Stoffelen, Su, Taylor, Tomita, Trenberth, von Schuckmann, Wentz, Wentz, WGASF, Woodruff, Wu, Yu   +87 more
core   +3 more sources

Sensitivity of GNSS-R spaceborne observations to soil moisture and vegetation [PDF]

, 2016
Global navigation satellite systems-reflectometry (GNSS-R) is an emerging remote sensing technique that makes use of navigation signals as signals of opportunity in a multistatic radar configuration, with as many transmitters as navigation satellites are
Camps Carmona, Adriano José, Foti, Giuseppe, Gommenginger, Christine, Hyuk, Park, Judge, J., Pablos Hernánez, Miriam, Pang-Wei, Liu   +6 more
core   +2 more sources

Validation of spaceborne and modelled surface soil moisture products with cosmic-ray neutron probes [PDF]

, 2017
The scale difference between point in situ soil moisture measurements and low resolution satellite products limits the quality of any validation efforts in heterogeneous regions.
Bogena, Heye R., Monerris, Alessandra, Montzka, Carsten, Morrison, Ross, Muddu, Sekhar, Vereecken, Harry, Zreda, Marek   +6 more
core   +4 more sources