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Sensitivity of Mediterranean thermohaline circulation to gateway depth: A model investigation
2010
Paleoceanography
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Citation: Alhammoud, B., P. T. Meijer, and H. A. Dijkstra (2010), Sensitivity of Mediterranean thermohaline circulation to gateway depth: A model investigation, Paleoceanography, 25, PA2220, ...
Alhammoud et al., unpublished results, 2007) . We suggest it would be very interesting to explore whether this behavior can be confirmed from observations. ...
Jungclaus and Mellor [2000] ; the eastward flow of the Atlantic water along the African coast as described by Millot [1999] ; and the northward recirculation in the easternmost part of the basin [Alhammoud ...
doi:10.1029/2009pa001823
fatcat:cmtxhsv2hrhcdfyugjzidpo37m
Patterns of Precipitation and Convection Occurrence over the Mediterranean Basin Derived from a Decade of Microwave Satellite Observations
2014
Atmosphere
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Author Contributions Led design of the study and writing of the manuscript (Bahjat Alhammoud and Chantal Claud), processing of the AMSU-B datasets (Bahjat Alhammoud and Beatriz M. ...
Funatsu) and assembly of the HOAPS and ERA-Interim datasets (Bahjat Alhammoud). ...
doi:10.3390/atmos5020370
fatcat:vjkfjs4f2rdjtpabzihlzfzdey
Sentinel-2A MSI and Landsat-8 OLI radiometric cross comparison over desert sites
2018
European Journal of Remote Sensing
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The Sentinel-2A and Landsat-8 satellites carry on-board moderate resolution multispectral imagers for the purpose of documenting the Earth's changing surface. Though they are independently built and managed, users will certainly take advantage of the opportunity to have higher temporal coverage by combining the datasets. Thus it is important for the radiometric and geometric calibration of the MultiSpectral Instrument (MSI) and the Operational Land Imager (OLI) to be compatible.
doi:10.1080/22797254.2018.1507613
fatcat:xjibavq6rvebjkq3mlc3ntrvse
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... n of MSI to OLI has been accomplished using multiple techniques involving the use of pseudo-invariant calibration sites (PICS) using direct comparisons as well as through use of PICS models predicting top-ofatmosphere reflectance. A team from the University of Arizona is acquiring field data under both instruments for vicarious calibration of the sensors. This paper shows that the work done to date by the Landsat and Sentinel-2 calibration teams has resulted in stable radiometric calibration for each instrument and consistency to~2.5% between the instruments for all the spectral bands that the instruments have in common. ARTICLE HISTORY
Impact of the spatial distribution of the atmospheric forcing on water mass formation in the Mediterranean Sea
2010
Journal of Geophysical Research
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The structure of the AW boundary current in the Levantine basin resembles that described by Alhammoud et al. [2005] . ...
doi:10.1029/2009jc005648
fatcat:lutxigxn65gv3jqkg7ry4dhe5i
Copernicus Sentinel-2A Calibration and Products Validation Status
2017
Remote Sensing
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As part of the Copernicus programme of the European Union (EU), the European Space Agency (ESA) has developed and is currently operating the Sentinel-2 mission that is acquiring high spatial resolution optical imagery. This paper provides a description of the calibration activities and the current status of the mission products validation activities. Measured performances, from the validation activities, cover both Top-Of-Atmosphere (TOA) and Bottom-Of-Atmosphere (BOA) products. Results
doi:10.3390/rs9060584
fatcat:fglsduu6g5bjpd6nmxpspa2hfy
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... d in this paper show the good quality of the mission products both in terms of radiometry and geometry and provide an overview on next mission steps related to data quality aspects. between minimizing cloud cover and ensuring suitable sun illumination. An overview of the MSI imaging payload is provided in the following section. The Sentinel-2 satellites will systematically acquire observations over land and coastal areas from −56 ° to 84 ° latitude including islands larger 100 km 2 , EU islands, all other islands less than 20 km from the coastline, the whole Mediterranean Sea, all inland water bodies and all closed seas. Over specific calibration sites, for example DOME-C in Antarctica, additional observations will be made. The two satellite units will work on opposite sides of the orbit. Sentinel-2A launch took place in June 2015 and Sentinel-2B is foreseen beginning 2017. Therefore, this paper focuses only on the performances achieved by Sentinel-2A. The availability of products with good data quality performances (both in terms of radiometry and geometry accuracies) has a paramount importance for many applications. This is indeed a key enabling factor for an easier exploitation of time-series, inter-comparison of measurements from different sensors or detection of changes in the landscape. Calibration and validation (Cal/Val) corresponds to the process of updating and validating on-board and on-ground configuration parameters and algorithms to ensure that the product data quality requirements are met. This paper provides a description of the calibration activities and the current status, one year after Sentinel-2A launch, of the mission products validation activities. Measured performances, derived from the validation activities, have been estimated for both Top-Of-Atmosphere (TOA) and Bottom-Of-Atmosphere (BOA) products (referred respectively as Level-1 and Level-2A and further described later in this paper). . Multi-Spectral Instrument Overview This section provides a brief overview of Sentinel-2 Multi-Spectral Instrument (MSI). It aims at giving to the reader the basis required to fully understand the measured performances and the Calibration and Validation (Cal/Val) approach. MSI Design The MSI instrument design has been driven by the large swath requirement together with the demanding geometrical and spectral performances of the measurements. It is based on a push-broom concept, featuring a Three-Mirror Anastigmatic (TMA) telescope feeding two focal planes spectrally separated by a dichroic filter, as shown on Figure 1 . One focal plane includes the Visible and Near-Infrared (VNIR) bands and the other one the Short-Wave Infrared (SWIR) bands. Figure 1. MSI internal configuration. On the left, full instrument view and optical path construction to the SWIR/VNIR (see §2.2) splitter and focal planes. Spectral Bands and Resolution Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: Overlapping area = 98 pixels @ 20m 10 bands B/H cross-detector B/H cross-band Nb pixels / detector module: 2592 (10m) or 1296 (20m -60m) Satellite track YLOS XLOS ZLOS ψX ψY Viewing direction Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted:
The response of Mediterranean thermohaline circulation to climate change: a minimal model
2009
Climate of the Past
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We thank Bahjat Alhammoud and Pasha Karami for stimulating discussions and Bernd Haupt and an anonymous referee for providing constructive reviews. ...
doi:10.5194/cp-5-713-2009
fatcat:dogzgybijjhj5nwxakxrdi4pty
Observations and Recommendations for the Calibration of Landsat 8 OLI and Sentinel 2 MSI for Improved Data Interoperability
2018
Remote Sensing
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Authors 5, 6 and 7 thank Bahjat Alhammoud (ARGANS) and Marion Neveu Van Malle (Thales Alenia Space) for providing the results for Sentinel-2 radiometric and geometric validation respectively. ...
doi:10.3390/rs10091340
fatcat:xudyr6znp5hypgznqw22rltu5a