HR: 0800h
AN: U41C-0617 [Abstracts]
TI: Carbon dioxide fluxes across the atmosphere-water-coastal eroded ice complex in the Arctic Ocean: Laptev and Kara seas
AU: * Semiletov, I P
EM: igorsm@iarc.uaf.edu
AF: International Arctic Research Center/University Alaska Fairbanks, 930 Koyukuk Drive
(Akasofu Building), Fairbanks, AK 99775, United States
AU: * Semiletov, I P
EM: igorsm@iarc.uaf.edu
AF: VI Il'ichov Pacific Oceanological Institute, Far eastern Branch of Russian Academy of
Sciences (FEBRAS), 43 Baltic Street, Vladivostok, 690041, Russian Federation
AU: Pipko, I I
EM: irina@poi.dvo.ru
AF: VI Il'ichov Pacific Oceanological Institute, Far eastern Branch of Russian Academy of
Sciences (FEBRAS), 43 Baltic Street, Vladivostok, 690041, Russian Federation
AU: Kosmach, D
EM: den_kosm@poi.dvo.ru
AF: VI Il'ichov Pacific Oceanological Institute, Far eastern Branch of Russian Academy of
Sciences (FEBRAS), 43 Baltic Street, Vladivostok, 690041, Russian Federation
AU: Salyuk, A
EM: san@poi.dvo.ru
AF: VI Il'ichov Pacific Oceanological Institute, Far eastern Branch of Russian Academy of
Sciences (FEBRAS), 43 Baltic Street, Vladivostok, 690041, Russian Federation
AU: Dudarev, O V
EM: dudarev@poi.dvo.ru
AF: VI Il'ichov Pacific Oceanological Institute, Far eastern Branch of Russian Academy of
Sciences (FEBRAS), 43 Baltic Street, Vladivostok, 690041, Russian Federation
AU: Repina, I
AF: A Obukhov Institute of Atmospheric Physics, Russian Academy of Sciences, 23 Pizhevski
pereulok, Moscow, 140077, Russian Federation
AU: Shakhova, N E
EM: nshakhov@iarc.uaf.edu
AF: International Arctic Research Center/University Alaska Fairbanks, 930 Koyukuk Drive
(Akasofu Building), Fairbanks, AK 99775, United States
AU: Shakhova, N E
EM: nshakhov@iarc.uaf.edu
AF: VI Il'ichov Pacific Oceanological Institute, Far eastern Branch of Russian Academy of
Sciences (FEBRAS), 43 Baltic Street, Vladivostok, 690041, Russian Federation
AB:
Despite the significant progress that has been made in Arctic biogeochemical studies, large discrepancies still
exist between recent estimations of the carbon balance and cycling in the Arctic seas [Romankevich and Vetrov,
2001; Stein and Macdonald, 2003; Macdonald et al., 2006] because reliable data are lacking. The Arctic Ocean
has been suggested to be a net sink for atmospheric CO2, favoured by cold, relatively low salinity surface layers).
Unfortunately, estimates of annual CO2 uptake from the atmosphere vary widely from 1700 ×
billions moles (Anderson, et al., 1998) up to 11000 billions moles (Lyakhin and Rusanov, 1983), due to high
spatial variability and a difficulty of establishing representative values. To fill this gap with a substantial quantity of
good-quality data is one of the primary purposes of this study. During the September 2006 expedition in the
Laptev Sea and along the Northern Sea Route five research platforms were used to accomplish field work: the
ice-strengthened commercial vessel Kapitan Danilkin, two small vessels, the TB 0012 and the Neptun, an Mi-8
helicopter, and diesel icebreaker Kapitan Dranitsyn. CO2 and CH4 fluxes were measured using
micrometeorological methods, enclosure methods, or both. In our CO2 and CH4 exchange study setup,
momentum and the fluxes of sensible and latent heat were measured using the eddy-correlation technique,
which is the most direct micrometeorological method. Dynamics of the carbonate system was studied using pH-
TALK technique. Preliminary results:
1. The coastal area of the Laptev Sea, strongly influenced by coastal erosion and river input of terrestrial carbon
(suspended and dissolved), acts as a strong source of CO2 into the atmosphere. CO2 flux from the sea
surface/nearshore zone ranged between 0.31 - 0.4 μM/Ã�¼Â²/sec
(for comparison, �¡�ž2 release from the tundra soil ranged between 0.03
- 0.18 μM/Ã�¼Â²/sec). The highest rates of Ã�¡Ã�ž2
emission were measured in the freshly-exposed eroded depressions.
2. CO2 fluxes off-shore revealed a mosaic distribution of both intensity and direction of gas exchange, which
depended on the characteristics of the underlying water masses. Upper Halocline Water, along with Atlantic
Intermediate Water, may act either as a potential source of CO2 to the atmosphere or as a sink.
DE: 0312 Air/sea constituent fluxes (3339, 4504)
DE: 0490 Trace gases
DE: 1615 Biogeochemical cycles, processes, and modeling (0412, 0414, 0793, 4805, 4912)
DE: 4207 Arctic and Antarctic oceanography (9310, 9315)
DE: 4820 Gases
SC: Union [U]
MN: 2007 Fall Meeting