HR: 0800h
AN: H31D-1336 [Abstracts]
TI: Contribution of Lena River Tributaries and Delta to Water, Suspended Matter and Chemical Constituents
Fluxes to the Arctic
AU: * Karabanov, E B
EM: ekarab@geol.sc.edu
AF: University of South Carolina, Department of Geological Sciences, 701 Sumter Street, Columbia, SC 29208
United States
AU: * Karabanov, E B
EM: ekarab@geol.sc.edu
AF: Institute of Geochemistry, Siberian Branch of Russian Academy of Sciences, 1A Favorskogo Street,
Irkutsk, Irk 334033
Russian Federation
AU: Armstrong, S
EM: sarmstrong@geol.sc.edu
AF: University of South Carolina, Department of Geological Sciences, 701 Sumter Street, Columbia, SC 29208
United States
AU: Williams, D
EM: YogaDoug@sc.rr.com
AF: University of South Carolina, Department of Geological Sciences, 701 Sumter Street, Columbia, SC 29208
United States
AU: Styles, R
EM: rstyies@geol.sc.edu
AF: University of South Carolina, Department of Geological Sciences, 701 Sumter Street, Columbia, SC 29208
United States
AU: Kuzmin, M I
EM: makhom@igc.irk.ru
AF: Institute of Geochemistry, Siberian Branch of Russian Academy of Sciences, 1A Favorskogo Street,
Irkutsk, Irk 334033
Russian Federation
AU: Buchinskyi, V
EM: val@igc.irk.ru
AF: Institute of Geochemistry, Siberian Branch of Russian Academy of Sciences, 1A Favorskogo Street,
Irkutsk, Irk 334033
Russian Federation
AU: Dudarev, O
EM: dudarev@poi.dvo.ru
AF: Pacific Institute of Oceanography, Far East Branch of Russian Academy of Sciences, Baltiiskaya 43,
Vladivostok, Pri 690041
Russian Federation
AU: Charkin, A
EM: charkin@poi.dvo.ru
AF: Pacific Institute of Oceanography, Far East Branch of Russian Academy of Sciences, Baltiiskaya 43,
Vladivostok, Pri 690041
Russian Federation
AU: Wang, W
EM: weihong.wang@msci.sc.edu
AF: University of South Carolina, Department of Geological Sciences, 701 Sumter Street, Columbia, SC 29208
United States
AU: Mamontov, A
EM: val@igc.irk.ru
AF: Institute of Geochemistry, Siberian Branch of Russian Academy of Sciences, 1A Favorskogo Street,
Irkutsk, Irk 334033
Russian Federation
AU: Tarasova, E
EM: val@igc.irk.ru
AF: Institute of Geochemistry, Siberian Branch of Russian Academy of Sciences, 1A Favorskogo Street,
Irkutsk, Irk 334033
Russian Federation
AB:
Approximately 60% of the total riverine-water discharge to the Arctic comes from three major Siberian rivers, the Ob,
Yenisey and Lena. These rivers also transport large amounts of dissolved and particulate material into Arctic Seas. As the
second largest river in Russia in terms of water discharge, the Lena's importance, in terms of suspended matter and carbon
transport to the Arctic Ocean, is enhanced due to the entrapment of almost all suspended sediment into the estuaries of the
Ob and Yenisey (Meade et al., 2000), thus making the Lena River an essential component of the global carbon cycle. From this
point of view, understanding the export of bio-related components to the Arctic is a critical component of global carbon
cycles, especially due to very limited data about the real export of dissolved and particulate loads to the Arctic.
During the summer of 2003, ADCP transects of the Lena's currents and acoustic backscatter were repeated with 20 cm vertical
and sub-meter horizontal resolutions for 500 km reaches along nearly 3700 km of the river and at each major tributary.
Concurrently, multi-parameter CTD casts, water chemistry and suspended particulate matter (SPM) concentrations were sampled.
Based on data collected, water flow through the river increased with distance from the headwaters (150 m3/s) and increased
greatly with contributions from the many tributaries along the river's length, reaching a peak (over 37000 m3/s) at lowest
reach above the delta, which is in good agreement with average discharge of Lena River during this time. The concentration of
SPM, and other particulate and dissolved constituents fluctuates along river length increasing (SPM, Corg-susp, C org-disol,
Norg-disol, Si-disol) or decreasing (Norg-susp) mostly below each major tributaries (Kirenga, Vitim, Olekma, Aldan and
Vilui), indicating contribution (or effect dilution) of tributaries and its sub-basins to total load of Lena River. While,
fluxes of all constituents in the river increased abruptly below all major tributaries proportionally with the increasing of
water flow. The major contribution of SPM, total carbon, nitrogen and phosphorous to the Lena River load during June-July
2003 was provided by the Aldan River.
The presence of the huge Lena Delta also appears to affect the final export of suspended and dissolved loads to the Laptev
Sea. Final export of some components decreased or increased several times in comparison with the reference stationary gauge
at Kusur located 300 km up stream. The flux of total suspended matter increased to 1.26 times before entering the Laptev Sea,
while fluxes of particulate Norg, Pinorg, Porg, Corg decreased to 5.8, 3.3, 1.8, 1.3 times correspondingly, showing that
biological, biogeochemical and sedimentological processes occurred in the delta affecting the final discharge of Lena River
to the Arctic Ocean.
UR: http://arcticchamp.sr.unh.edu
DE: 1860 Streamflow
DE: 1862 Sediment transport (4558)
DE: 1876 Water budgets
DE: 1895 Instruments and techniques: monitoring
SC: Hydrology [H]
MN: Fall Meeting 2005