. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Yamshexsky Model M-80 / :\ Eppley Model 2 AH (MW/CM2) Yanishevsky Model M-80. Eppley Model 2 Hour Beginning (GMT) Fic. 5. Relative response of a group of Yanishcvsky pyranometers (Nos. 43, 2, and 5373) and a pair of Eppley pyranometers (Nos. 11539 and 12159) during the period 2-9 August 1973, showing the variation in lcsponse due to sun elevation angle. number were obtained during the period to provide a useful comparison. Measurements were obtained
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Yamshexsky Model M-80 / :\ Eppley Model 2 AH (MW/CM2) Yanishevsky Model M-80. Eppley Model 2 Hour Beginning (GMT) Fic. 5. Relative response of a group of Yanishcvsky pyranometers (Nos. 43, 2, and 5373) and a pair of Eppley pyranometers (Nos. 11539 and 12159) during the period 2-9 August 1973, showing the variation in lcsponse due to sun elevation angle. number were obtained during the period to provide a useful comparison. Measurements were obtained once each 30 min when cloud conditions allowed. The pyrheli- ometer measurements were exchanged at sea and serve as the basis for this report. The basic data will be pub- lished by Hanson (1974). In order to compare sensors, data from pyrheliometers on the Korolov, Researcher, and Uribe were compared individually with the pyrheliometer on the Krenkel (No. 247) by considering only those cases in which simultane- ous measurements were obtained. As indicated in Table 8, there were 76 simultaneous measurements between the Korolov and Krenkel, 63 between the Researcher and Krenkel, and 9 between the Uribe and Krenkel. Also given in Table 8 are the responses of individual pyrheli- ometers, all relative to pyrheliometer No. 247 on the Krenkel. The results show that all four pyrheliometers are within 2% and that three of the four are within 1%. The pyrheliometer on the Researcher has traceability to the International Pyrheliometric Scale, 1956, as do the pyrheliometers on the Korolov and Kienkel; these three instruments differ at most by The pyrheliometer on the Uribe (No. 54585) was calibrated at sea against Yanishevsky control pyrheliometer No. 209 on board the Krenkel. This accounts for the close agreement (Table 8) between pyheliometers on the Krenkel and Uribe. Table 8. Comparison of pyrheliometers. Number Sensor Ship Type sensor Sensor serial No. samples simul- taneous wit
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