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| Titel |
Lena Delta hydrology and geochemistry: long-term hydrological data and recent field observations |
| VerfasserIn |
I. Fedorova, A. Chetverova, D. Bolshiyanov, A. Makarov, J. Boike, B. Heim, A. Morgenstern, P. P. Overduin, C. Wegner, V. Kashina, A. Eulenburg, E. Dobrotina, I. Sidorina |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 2 ; Nr. 12, no. 2 (2015-01-19), S.345-363 |
| Datensatznummer |
250117776
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| Publikation (Nr.) |
 copernicus.org/bg-12-345-2015.pdf |
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| Zusammenfassung |
| The Lena River forms one of the largest deltas in the Arctic. We compare two
sets of data to reveal new insights into the hydrological, hydrochemical, and
geochemical processes within the delta: (i) long-term hydrometric
observations at the Khabarova station at the head of the delta from 1951
to 2005; (ii) field hydrological and geochemical observations carried out
within the delta since 2002. Periods with differing relative discharge and
intensity of fluvial processes were identified from the long-term record of
water and sediment discharge. Ice events during spring melt (high water)
reconfigured branch channels and probably influenced sediment transport
within the delta. Based on summer field measurements during 2005–2012 of
discharge and sediment fluxes along main delta channels, both are increased
between the apex and the front of the delta. This increase is to a great
extent connected with an additional influx of water from tributaries, as well as
an increase of suspended and dissolved material released from the ice
complex. Summer concentrations of major ion and biogenic substances along the
delta branches are partly explained by water sources within the delta, such
as thawing ice complex waters, small Lena River branches and estuarine areas. |
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