2002a), The significance of multidimensional radiative transfer effects measured in surface fluxes at an Antarctic coastline

• Main Authors: Dan Lubin, Paul Ricchiazzi, Allison Payton, Catherine Gautier
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Antarctic; Janus; Janus Island; Outcast Islands; Palmer Station; Palmer-Station; Antarc*; Antarctica
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.381.9653; http://spsp.ucsd.edu/Researchers/Dan_Lubin/pdfs/2001JD002030.pdf

[1] At a coastal high-latitude site, multiple reflection of photons between the high albedo surface and an overlying cloud can enhance the downwelling shortwave flux out over the adjacent open water to a distance of several kilometers. This coastal albedo effect has been predicted by theoretical radiative transfer studies and has also been measured under ideal conditions. In this study, three multispectral solar ultraviolet radiometers were deployed in the vicinity of Palmer Station, Antarctica (64 ° 46 0 S, 64 ° 04 0 W) to determine the prevalence of the coastal albedo effect under the region’s natural variability in cloud cover. One radiometer was deployed near the base of a glacier, and the other two radiometers were deployed on Janus Island and Outcast Island, islets 2.8 km (1.5 nautical miles) and 5.6 km (3 nautical miles) distant from Palmer Station, respectively. The radiometers were operated simultaneously for 16 days during late December 1999 and January 2000. Under all cloudy sky conditions sampled by this experiment the coastal albedo effect is seen in the data 60 % of the time, in the form of a decreasing gradient in surface flux from Palmer Station through Janus and Outcast Islands. During the other 40 % of the cloudy sky measurements, local cloud inhomogeneity obscured the coastal