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Publications (6)7.28 Total impact

  • Journal of Atmospheric and Oceanic Technology 07/2005; 22. · 1.82 Impact Factor
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    ABSTRACT: The Terra and Aqua satellites are the flagships of the NASA Earth Observing System and carry suites of sensors designed to provide measurements of the climate system suitable for many research applications. Each satellite carries a Moderate-Resolution Imaging Spectroradiometer (MODIS), which are very complex imaging radiometers operating in both the visible and infrared parts of the electromagnetic spectrum. One of the primary variables that is derived from some of the infrared measurements of MODIS is sea-surface temperature (SST). There are two spectral intervals located where the atmosphere is relatively transparent, at about 4 and 11 micrometer wavelengths, where SST measurements can be made in cloud-free conditions, although the contamination of the shorter wavelength measurements by reflected sunlight limits these to the night-time part of each orbit. The atmospheric correction algorithms used to derive SSTs are described, along with radiometric and sub-surface measurements used to determine the error characteristics of the retrieved fields
    Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings. 2004 IEEE International; 10/2004
  • Journal of Atmospheric and Oceanic Technology 02/2004; 21:268-283. · 1.82 Impact Factor
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    ABSTRACT: The second calibration and intercomparison of infrared radiometers (Miami2001) was held at the University of Miami's Rosenstiel School of Marine and Atmospheric Science (RSMAS) during a workshop held from May to June 2001. The radiometers targeted in these two campaigns (laboratory-based and at-sea measurements) are those used to validate the skin sea surface temperatures and land surface temperatures derived from the mea-surements of imaging radiometers on earth observation satellites. These satellite instruments include those on currently operational satellites and others that will be launched within two years following the workshop. The experimental campaigns were completed in one week and included laboratory measurements using blackbody calibration targets characterized by the National Institute of Standards and Technology (NIST), and an inter-comparison of the radiometers on a short cruise on board the R/V F. G. Walton Smith in Gulf Stream waters off the eastern coast of Florida. This paper reports on the results obtained from the shipborne measurements. Seven radiometers were mounted alongside each other on the R/V Walton Smith for an intercomparison under seagoing conditions. The ship results confirm that all radiometers are suitable for the validation of land surface temperature, and the majority are able to provide high quality data for the more difficult validation of satellite-derived sea surface temperature, contributing less than 0.1 K to the error budget of the validation. The mea-surements provided by two prototype instruments developed for ship-of-opportunity use confirmed their potential to provide regular reliable data for satellite-derived SST validation. Four high quality radiometers showed agreements within 0.05 K confirming that these instruments are suitable for detailed studies of the dynamics of air–sea interaction at the ocean surface as well as providing high quality validation data. The data analysis confirms the importance of including an accurate correction for reflected sky radiance when using infrared radiometers to measure SST. The results presented here also show the value of regular intercomparisons of ground-based instruments that are to be used for the validation of satellite-derived data products—products that will be an essential component of future assessments of climate change and variability.
    Journal of Atmospheric and Oceanic Technology 02/2004; 21(2). · 1.82 Impact Factor
  • Journal of Atmospheric and Oceanic Technology 02/2004; 21:258-267. · 1.82 Impact Factor
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    ABSTRACT: Atmospheric water vapor is an important part of the Earth's hydrological cycle and plays a crucial role in many aspects of the climate system. The main source of the atmospheric moisture are the oceans, but the information we have about the distribution of atmospheric water vapor over the oceans is based on a relatively sparse distribution of radiosonde profiles, or on satellite-based measurements from microwave radiometers. The Marine-Atmosphere Emitted Radiance Interferometer (M-AERI) is a sea-going instrument that measures spectra of atmospheric infrared emission with ~10 minute temporal resolution. These spectra can be used to retrieve profiles of temperature and humidity in the atmosphere, and can thus be employed for continuous monitoring of the distribution of temperature and humidity in the marine atmosphere. M-AERI measurements can also be used to validate both modeling results and satellite measurements. This study compares ship-based measurements of atmospheric water vapor path from the M-AERI, radiosondes, and an upward-looking microwave radiometer. The data come from a two-month deployment in the Caribbean Sea on the RCCL Explorer of the Seas and during a month long cruise on the USCGC Healy. The measurements are compared with results from global circulation models NCEP and ECMWF. A comparison of satellite retrieved profiles of atmospheric water vapor from the Atmospheric Infrared Sounder (AIRS) with M-AERI measurements is discussed in a presentation in session A.19.
    AGU Fall Meeting Abstracts. 01/2004;