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fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
J. Wood; T. J. Smyth; V. Estellés (2017)
Publisher: Copernicus Publications
Journal: Atmospheric Measurement Techniques
Languages: English
Types: Article
Subjects: TA170-171, TEC, Earthwork. Foundations, EA0, EAS, Environmental engineering, ATM, MET, MAR, TA715-787
We have developed two hyperspectral radiometer systems which require no moving parts, shade rings or motorised tracking making them ideally suited for autonomous use in the inhospitable remote marine environment. Both systems are able to measure the direct and diffuse hyperspectral irradiance fields in the wavelength range 350–1050 nm at 6 nm (Spectrometer 1) or 3.5 nm (Spectrometer 2) resolution. Marine field-trials along a 100° transect (between 50° N and 50° S) of the Atlantic Ocean resulted in close agreement with existing commercially available instruments in measuring: (1) photosynthetically available radiation (PAR) with both spectrometers giving regression slopes close to unity (Spectrometer 1: 0.960; Spectrometer 2: 1.006) and R2 ~ 0.96; (2) irradiant energy, with R2 ~ 0.98 and a regression slope of 0.75 which can be accounted for by the difference in wavelength integration range and; (3) hyperspectral irradiance where the agreement on average was between 2–5 %. Two long duration land based field campaigns of up to 18 months allowed both spectrometers to be well calibrated. This was also invaluable for empirically correcting for the wider field-of-view (FOV) of the spectrometers in comparison with the current generation of sun photometers (~ 7.5° compared with ~ 1°). The need for this correction was also confirmed and independently quantified by atmospheric radiative transfer modelling and found to be a function of aerosol optical depth (AOD) and solar zenith angle. Once Spectrometer 2 was well calibrated and the FOV effect corrected for, the RMSE in retrievals of AOD when compared with a CIMEL sun photometer were reduced to ~ 0.02–0.03 with R2 > 0.95 at wavelengths 440, 500, 670 and 870 nm. Corrections for the FOV as well as ship motion were applied to the data from the marine field trials. This resulted in AOD500 nm ranging between 0.05 in the clear background marine aerosol regions to ~ 0.5 within the Saharan dust plume. The RMSE between the handheld Microtops sun photometer and Spectrometer 2 was between 0.047–0.057 with R2 > 0.94.
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    • Badosa, J., Wood, J., Blanc, P., Long, C. N., Vuilleumier, L., Demengel, D., and Haeffelin, M.: Solar irradiances measured using SPN1 radiometers: uncertainties and clues for development, Atmospheric Measurement Techniques, 7, 4267-4283, 10.5194/amt-7-4267-2014, 2014.
    • Baker, A. R., Jickells, T. D., Biswas, K. F., Weston, K., and French, M.: Nutrients in atmospheric aerosol particles along the Atlantic Meridional Transect, Deep-Sea Research Part Ii-Topical Studies in Oceanography, 53, 1706-1719, 10.1016/j.dsr2.2006.05.012, 2006.
    • Campanelli, M., Estelles, V., Smyth, T., Tomasi, C., Martìnez-Lozano, M., Claxton, B., Muller, P., Pappalardo, G., Pietruczuk, A., and Shanklin, J.: Monitoring of Eyjafjallajökull volcanic aerosol by the new European Skynet Radiometers (ESR) network, Atmos. Environ., 48, 33-45, 2012.
    • Caquineau, S., Gaudichet, A., Gomes, L., and Legrand, M.: Mineralogy of Saharan dust transported over northwestern tropical Atlantic Ocean in relation to source regions, Journal of Geophysical Research-Atmospheres, 107, 10.1029/2000jd000247, 2002.
    • di Sarra, A., Sferlazzo, D., Meloni, D., Anello, F., Bommarito, C., Corradini, S., De Silvestri, L., Di Iorio, T., Monteleone, F., Pace, G., Piacentino, S., and Pugnaghi, S.: Empirical correction of multifilter rotating shadowband radiometer (MFRSR) aerosol optical depths for the aerosol forward scattering and development of a long-term integrated MFRSR-Cimel dataset at Lampedusa, Applied Optics, 54, 2725-2737, 10.1364/ao.54.002725, 2015.
    • Dubovik, O., and King, M. D.: A flexible inversion algorithm for retrieval of aerosol optical properties from Sun and sky radiance measurements, Journal of Geophysical Research-Atmospheres, 105, 20673-20696, 10.1029/2000jd900282, 2000.
    • Estelles, V., Utrillas, M. P., Martinez-Lozano, J. A., Alcantara, A., Alados-Arboledas, L., Olmo, F. J., Lorente, J., de Cabo, X., Cachorro, V., Horvath, H., Labajo, A., Sorribas, M., Diaz, J. P., Diaz, A. M., Silva, A. M., Elias, T., Pujadas, M., Rodrigues, J. A., Canada, J., and Garcia, Y.: Intercomparison of spectroradiometers and Sun photometers for the determination of the aerosol optical depth during the VELETA-2002 field campaign, Journal of Geophysical ResearchAtmospheres, 111, 10.1029/2005jd006047, 2006.
    • Estelles, V., Martinez-Lozano, J. A., Utrillas, M. P., and Campanelli, M.: Columnar aerosol properties in Valencia (Spain) by ground-based Sun photometry, Journal of Geophysical Research-Atmospheres, 112, 10.1029/2006jd008167, 2007.
    • Estelles, V., Smyth, T. J., and Campanelli, M.: Columnar aerosol properties in a Northeastern Atlantic site (Plymouth, United Kingdom) by means of ground based skyradiometer data during years 2000-2008, Atmos. Environ., 61, 180-188, 10.1016/j.atmosenv.2012.07.024, 2012.
    • Evgenieva, T., Iliev, I., Kolev, N., Sobolewski, P., Pieterczuk, A., Holben, B., and Kolev, I.: Optical characteristics of aerosol determined by Cimel, Prede and Microtops II sun photometers over Belsk (Poland), in: 15th International School on Quantum Electronics: Laser Physics and Applications, edited by: Dreischuh, T., Taskova, E., Borisova, E., and Serafetinides, A., Proceedings of SPIE, 2008.
    • Gueymard, C. A.: Parameterized Transmittance Model for Direct Beam and Circumsolar Spectral Irradiance., Solar Energy, 71, 325 - 346, 2001.
    • Kasten, F., and Young, A. T.: Revised optical air mass tables and approximation formula, Appl. Opt., 28, 4735-4738, 1989.
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