High-resolution airborne infrared measurements of ocean skin temperature

LDEO Publication: 
Publication Type  Journal Article
Year of Publication  2005
Authors  Zappa, C. J.; Jessup, A. T.
Journal Title  Ieee Geoscience and Remote Sensing Letters
Volume  2
Issue  2
Pages  146-150
Journal Date  Apr
ISBN Number  1545-598X
Accession Number  ISI:000230796000012
LDEO Publication Number  6696
Key Words  airborne infrared imaging; air-sea interaction; internal waves; ocean skin temperature; upper ocean processes; sea-surface temperature; variability

Airborne measurements of ocean skin temperature T, are presented from the Coupled Boundary Layers, Air-Sea Transfer in Low Winds (CBLAST-Low) Pilot Experiment in August 2001 off Martha's Vineyard, MA. We used an infrared (IR) camera with a spatial resolution of 1 in or less and temperature resolution of roughly 0.02 degrees C. Using subframe sampling of the IR imagery, we achieve lower noise and higher spatial resolution than reported by previous investigators using IR radiometers. Fine-scale maps of T. exhibit horizontal variability over spatial scales ranging from O(10 km) down to O(1 m) that are related to atmospheric and subsurface phenomena under low to moderate wind conditions. Based on supporting measurements of wind and waves, we identify coherent ramp-like structures in T, with stratification breakdown and meandering streaky features with internal waves. Regional maps of T. show the standard deviation for the region is +/- 1.04 degrees C, while the meridional and zonal variability is 0.23 degrees C (.) km(-1) and 0.27 degrees C (.) km(-1), respectively. This temperature variability results in meridional and zonal scalar heat flux variability of 7.0 W (.) m(-2) (.) km(-1) and 7.6 W (.) m(-2) (.) km(-1), respectively. Our results demonstrate the potential for airborne IR imagery accompanied by high-quality ocean data to identify T-s features produced by subsurface circulation.


949NSTimes Cited:4Cited References Count:19

URL  <Go to ISI>://000230796000012
DOI  Doi 10.1109/Lgrs.2004.841629