The Fluvial Geochemistry of the Rivers of Eastern Siberia and Implications for the Effect of Climate on Weathering
The dependence of weathering on climate (temperature and precipitation) forms the core of a negative feedback proposed to have maintained the Earth's atmospheric CO2 within habitable limits for most of its history. This hypothesis has not been proven from field results. Data for chemical compos...
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ftdtic:ADA363530 2023-05-15T13:24:37+02:00 The Fluvial Geochemistry of the Rivers of Eastern Siberia and Implications for the Effect of Climate on Weathering Huh, Youngsook MASSACHUSETTS INST OF TECH CAMBRIDGE 1998-06 text/html http://www.dtic.mil/docs/citations/ADA363530 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA363530 en eng http://www.dtic.mil/docs/citations/ADA363530 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Meteorology *CLIMATE *WEATHERING THESES CARBON DIOXIDE GREENHOUSE EFFECT SIBERIA *GEOCHEMICAL CARBON CYCLE SIBERIAN RIVERS CHEMICAL WEATHERING Text 1998 ftdtic 2016-02-20T01:59:14Z The dependence of weathering on climate (temperature and precipitation) forms the core of a negative feedback proposed to have maintained the Earth's atmospheric CO2 within habitable limits for most of its history. This hypothesis has not been proven from field results. Data for chemical compositions and fluxes of periglacial rivers of the Russian Far East-the Lena, Yana, Indigirka, Kolyma, and Anadyr-were acquired and compared to the published dataset on tropical watersheds. Three broad geological divisions are made to facilitate the comparison-the stable basement shield, region of uplift and mountain building, and the sedimentary platform. In all three geologic regions no climatic effect on the rate of uptake of CO2 by aluminosilicate weathering (Phi-CO2) was observed. This appears to be due to the unique non-glacial frost shattering processes which expose fresh rock surfaces and thus overcome the effect of temperature inhibition at high-latitudes. On the tropical shields, the lateritic cover builds up due to lack of topography, seals the weathering front from the climatic agents, and lowers weathering rates. There appear to be no primary climatic effects on weathering rates on the present Earth. Text Anadyr Anadyr' Siberia Defense Technical Information Center: DTIC Technical Reports database Anadyr ENVELOPE(177.510,177.510,64.734,64.734) Anadyr’ ENVELOPE(176.233,176.233,64.882,64.882) Indigirka ENVELOPE(149.609,149.609,70.929,70.929) Kolyma ENVELOPE(161.000,161.000,69.500,69.500) |
institution |
Open Polar |
collection |
Defense Technical Information Center: DTIC Technical Reports database |
op_collection_id |
ftdtic |
language |
English |
topic |
Meteorology *CLIMATE *WEATHERING THESES CARBON DIOXIDE GREENHOUSE EFFECT SIBERIA *GEOCHEMICAL CARBON CYCLE SIBERIAN RIVERS CHEMICAL WEATHERING |
spellingShingle |
Meteorology *CLIMATE *WEATHERING THESES CARBON DIOXIDE GREENHOUSE EFFECT SIBERIA *GEOCHEMICAL CARBON CYCLE SIBERIAN RIVERS CHEMICAL WEATHERING Huh, Youngsook The Fluvial Geochemistry of the Rivers of Eastern Siberia and Implications for the Effect of Climate on Weathering |
topic_facet |
Meteorology *CLIMATE *WEATHERING THESES CARBON DIOXIDE GREENHOUSE EFFECT SIBERIA *GEOCHEMICAL CARBON CYCLE SIBERIAN RIVERS CHEMICAL WEATHERING |
description |
The dependence of weathering on climate (temperature and precipitation) forms the core of a negative feedback proposed to have maintained the Earth's atmospheric CO2 within habitable limits for most of its history. This hypothesis has not been proven from field results. Data for chemical compositions and fluxes of periglacial rivers of the Russian Far East-the Lena, Yana, Indigirka, Kolyma, and Anadyr-were acquired and compared to the published dataset on tropical watersheds. Three broad geological divisions are made to facilitate the comparison-the stable basement shield, region of uplift and mountain building, and the sedimentary platform. In all three geologic regions no climatic effect on the rate of uptake of CO2 by aluminosilicate weathering (Phi-CO2) was observed. This appears to be due to the unique non-glacial frost shattering processes which expose fresh rock surfaces and thus overcome the effect of temperature inhibition at high-latitudes. On the tropical shields, the lateritic cover builds up due to lack of topography, seals the weathering front from the climatic agents, and lowers weathering rates. There appear to be no primary climatic effects on weathering rates on the present Earth. |
author2 |
MASSACHUSETTS INST OF TECH CAMBRIDGE |
format |
Text |
author |
Huh, Youngsook |
author_facet |
Huh, Youngsook |
author_sort |
Huh, Youngsook |
title |
The Fluvial Geochemistry of the Rivers of Eastern Siberia and Implications for the Effect of Climate on Weathering |
title_short |
The Fluvial Geochemistry of the Rivers of Eastern Siberia and Implications for the Effect of Climate on Weathering |
title_full |
The Fluvial Geochemistry of the Rivers of Eastern Siberia and Implications for the Effect of Climate on Weathering |
title_fullStr |
The Fluvial Geochemistry of the Rivers of Eastern Siberia and Implications for the Effect of Climate on Weathering |
title_full_unstemmed |
The Fluvial Geochemistry of the Rivers of Eastern Siberia and Implications for the Effect of Climate on Weathering |
title_sort |
fluvial geochemistry of the rivers of eastern siberia and implications for the effect of climate on weathering |
publishDate |
1998 |
url |
http://www.dtic.mil/docs/citations/ADA363530 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA363530 |
long_lat |
ENVELOPE(177.510,177.510,64.734,64.734) ENVELOPE(176.233,176.233,64.882,64.882) ENVELOPE(149.609,149.609,70.929,70.929) ENVELOPE(161.000,161.000,69.500,69.500) |
geographic |
Anadyr Anadyr’ Indigirka Kolyma |
geographic_facet |
Anadyr Anadyr’ Indigirka Kolyma |
genre |
Anadyr Anadyr' Siberia |
genre_facet |
Anadyr Anadyr' Siberia |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA363530 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766380578386477056 |