Transcript of OPP-0230455 Connections Among Atmospheric Forcing, Runoff and Conditions in the Laptev and East...
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- OPP-0230455 Connections Among Atmospheric Forcing, Runoff and
Conditions in the Laptev and East Siberian Seas. The First
All-hands Meeting of CHAMP PIs and Co-PIs, 18 19 February 2003,
Boulder, CO. I.P.Semiletov and G.E.Weller
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- Since the great Siberian rivers play a significant role in the
biogeochemical regime of the Arctic Ocean through transport of
carbon and nutrients into the sea and through permafrost thawing,
we address our project to evaluate the land hydrology effect on the
environmental change over most wide Arctic shelf : in the Laptev
and East- Siberian seas.
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- Goals of the atmosphere-land-shelf studies are follows: 1)
identify what type of atmospheric circulation causes similarities
or differences in the precipitation regime of the main East
Siberian and their discharge using a complex analysis of types of
atmospheric circulation, meteorological and land hydrology records;
2) investigate the connection between the variability in discharge
(and their anomalies) in the main East Siberian Rivers and two-
circulation regimes of the wind-driven Arctic Ocean as well with
dynamics of the Siberian High, and the difference between two
patterns of Arctic circulation in hydrology, hydrochemistry and
sedimentation (where available) in the Laptev and East-Siberian
Seas. 3) determine the linkage between multiyear variability
(inter-annual and intra-seasonal) of runoff and marine environment
(hydrology and hydrochemistry) and ice condition (where
available)
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- Knowledge of the coastal processes as a linkage between land
and ocean processes in the Arctic is a primary interest of this
project because the major transport of fresh water, dissolved and
solid material into the Arctic Ocean is determined by 1) the
fluvial discharges and 2) coastal erosion. Modified from Semiletov,
submitted to GRL Major transport of terrestrial solid material into
the Arctic Ocean: the Laptev and East-Siberian seas.
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- Custody of I.Semiletov We determine the inter-annual and
intra-seasonal variability of atmospheric forcing over East Siberia
and the adjacent part of the Arctic Ocean that influences the land
hydrology, runoff, water circulation and biogeochemical regime on
the East Siberian Shelf. How we do this: by acquiring, synthesing,
integrating and comparing land-shelf (meteorology, land and marine
hydrology, hydrochemistry and sediment data for two seminal areas
of the Arctic: 1) the Lena- Laptev Sea system, and 2) the
East-Siberian land-shelf system, which is influenced strongly by
the Pacific water inflow.
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- Data sets. All available meteorological, hydrological, and
hydrochemical data sets obtained by the Russian Academy of
Sciences, Hydromet, Navy Hydrography, and other institutions, and
including results of our own investigations (three cruises along
the Lena River from Yakutsk to Tiksi, 1995, 1998, 1999;
all-seasonal observations in the Lena Delta, 1994-1996 and seven
summer-fall oceanographic expeditions including Trans- Arctic
Expedition-2000). Data are taken from the published (USA web
sites), digitized and solid Cadastre and Bulletin yearbooks of
Yakutian Hydromet (Yakutsk, Tiksi, Cherskiy) and Roskomhydromet
(Moscow, Obninsk), Russian Academy of Sciences (Vladivostok,
Moscow), Far Eastern Hydromet, Navy Hydrography as well from the
unpublished reports of Tiksi Hydromet. Custody of I.Semiletov
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- Mean summer distribution of T,S (1932-2000) in the surface and
bottom waters of the Laptev (1,936 st.) and East-Siberian Seas
(3,594 st.). Custody of V.Luchin and I.Semiletov
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- DISTRIBUTION OF ORGANIC CARBON AND NITROGEN AND THEIR STABLE
ISOTOPES IN THE EAST-SIBERIAN SEA (Custody of Semiletov, Dudarev,
Shin, and Tanaka) shows strong influence of marine (Pacific)
processes on sedimentation in the eastern part of the East-Siberian
sea bounded at near 170E (similar with mean multi-year TS frontal
position )
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- We are looking for opportunities for collaborative
cross-cutting research among CHAMP/ASOF/SEARCH projects