THE SUMMER ARCTIC BOUNDARY LAYER DURING THE ARCTIC OCEAN EXPERIMENT 2001 (AOE-2001)
Abstract. Boundary-layer measurements made from the Swedish icebreaker Oden during the Arctic Ocean Experiment 2001 (AOE-2001) are analysed. They refer mainly to an ice-drift in the central Arctic during the period 2–21 August 2001. Onboard Oden a remote sensing array with a wind profiler, cloud rad...
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| Format: | Text |
| Language: | English |
| Published: |
2004
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.513.3221 http://people.su.se/~tjern/AOE2001.pdf |
| Summary: | Abstract. Boundary-layer measurements made from the Swedish icebreaker Oden during the Arctic Ocean Experiment 2001 (AOE-2001) are analysed. They refer mainly to an ice-drift in the central Arctic during the period 2–21 August 2001. Onboard Oden a remote sensing array with a wind profiler, cloud radar and a scanning microwave radiometer, and a regular weather station operated continuously; soundings were also released during research stations. Tur-bulence and profile measurements on an 18-m mast were deployed on the ice, along with two sodar systems, a microbarograph array and a tethered sounding system. Surface flux and meteorological stations were also deployed on nearby ice floes. There is a clear diurnal cycle in radiation and also in wind speed, cloud base and visibility. It is absent in temperature and humidity, probably due to the very strong control by melting / freezing ice and snow. In the advection of warm air, latent heat of melting maintains the surface temperature at 0 C, while with a negative energy balance the latent heat of freezing of the salty ocean water acts to maintain the surface temperature>)2 C. The constant presence of water at the surface maintains a relative humidity close to 100%, and this is also often facilitated by an increasing specific humidity through the capping inversion, making entrainment a moisture source. This |
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