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Radiation budget components and their parametrization in JASIN
Author(s) -
Lind Richard J.,
Katsaros Kristina B.,
Gube Marianne
Publication year - 1984
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49711046616
Subject(s) - shortwave , shortwave radiation , albedo (alchemy) , zenith , environmental science , atmospheric sciences , earth's energy budget , irradiance , parametrization (atmospheric modeling) , solar zenith angle , climatology , radiation , longwave , outgoing longwave radiation , meteorology , physics , radiative transfer , geology , optics , art , convection , performance art , art history
Components of the radiation balance over the sea surface were measured from RV Meteor and MV Endurer during July, August and September in the eastern North Atlantic (59°N 12°W) during the 1978 Joint Air Sea Interaction (JASIN) Experiment. Each component was modelled using routine hourly surface weather observations and compared to measurements. These models were used to estimate radiation components for RV John Murray and HMS Hecla . Daily net radiation at the surface ranged from 50 to 190 Wm −2 during JASIN. Standard deviations of daily mean net radiation averaged 45 Wm −2 for phase I of JASIN (23 July through 8 August), and 23 Wm −2 for phase II (22 August through 3 September). Shortwave irradiance estimates made with an empirical formula due to F. E. Lumb, using solar zenith angle and cloud amount and type, gave results to within 10 Wm −2 for most 5‐day periods, confirming results of other investigators. Shortwave exitance calculations, based upon smoothed observations of albedo by R. E. Payne, were made using both measured and model‐derived shortwave transmittances. Our results showed high correlation between model results and measurements. A recent model of longwave irradiance by two of the authors, RJL and KBK, gave results to within 10 Wm −2 when compared to daily mean measurements. The accuracy of these models, over periods of a few days, was found to approach what is obtainable with direct measurements.